crypt_gpgme.c File Reference

Wrapper for PGP/SMIME calls to GPGME. More...

#include "config.h"
#include <errno.h>
#include <gpg-error.h>
#include <gpgme.h>
#include <langinfo.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "private.h"
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "alias/lib.h"
#include "gui/lib.h"
#include "mutt.h"
#include "crypt_gpgme.h"
#include "lib.h"
#include "attach/lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "question/lib.h"
#include "send/lib.h"
#include "crypt.h"
#include "globals.h"
#include "gpgme_functions.h"
#include "handler.h"
#include "hook.h"
#include "mutt_logging.h"
#include "autocrypt/lib.h"

Include dependency graph for crypt_gpgme.c:

Go to the source code of this file.

Data Structures
struct	CryptCache
	Internal cache for GPGME. More...

Macros
#define	CRYPT_KV_VALID   (1 << 0)
#define	CRYPT_KV_ADDR   (1 << 1)
#define	CRYPT_KV_STRING   (1 << 2)
#define	CRYPT_KV_STRONGID   (1 << 3)
#define	CRYPT_KV_MATCH   (CRYPT_KV_ADDR | CRYPT_KV_STRING)
#define	PKA_NOTATION_NAME   "pka-address@gnupg.org"
#define	_LINE_COMPARE(_x, _y)   line_compare(_x, sizeof(_x) - 1, _y)
#define	MESSAGE(_y)   _LINE_COMPARE("MESSAGE-----", _y)
#define	SIGNED_MESSAGE(_y)   _LINE_COMPARE("SIGNED MESSAGE-----", _y)
#define	PUBLIC_KEY_BLOCK(_y)   _LINE_COMPARE("PUBLIC KEY BLOCK-----", _y)
#define	BEGIN_PGP_SIGNATURE(_y)    _LINE_COMPARE("-----BEGIN PGP SIGNATURE-----", _y)

Functions
static bool	is_pka_notation (gpgme_sig_notation_t notation)
	Is this the standard pka email address.
static void	redraw_if_needed (gpgme_ctx_t ctx)
	Accommodate for a redraw if needed.
const char *	crypt_keyid (struct CryptKeyInfo *k)
	Find the ID for the key.
static const char *	crypt_long_keyid (struct CryptKeyInfo *k)
	Find the Long ID for the key.
static const char *	crypt_short_keyid (struct CryptKeyInfo *k)
	Get the short keyID for a key.
static const char *	crypt_fpr (struct CryptKeyInfo *k)
	Get the hexstring fingerprint from a key.
const char *	crypt_fpr_or_lkeyid (struct CryptKeyInfo *k)
	Find the fingerprint of a key.
struct CryptKeyInfo *	crypt_copy_key (struct CryptKeyInfo *key)
	Return a copy of KEY.
static void	crypt_key_free (struct CryptKeyInfo **keylist)
	Release all the keys in a list.
bool	crypt_id_is_strong (struct CryptKeyInfo *key)
	Is the key strong.
int	crypt_id_is_valid (struct CryptKeyInfo *key)
	Is key ID valid.
static int	crypt_id_matches_addr (struct Address *addr, struct Address *u_addr, struct CryptKeyInfo *key)
	Does the key ID match the address.
gpgme_ctx_t	create_gpgme_context (bool for_smime)
	Create a new GPGME context.
static gpgme_data_t	create_gpgme_data (void)
	Create a new GPGME data object.
static gpgme_data_t	body_to_data_object (struct Body *b, bool convert)
	Create GPGME object from the mail body.
static gpgme_data_t	file_to_data_object (FILE *fp, long offset, size_t length)
	Create GPGME data object from file.
static int	data_object_to_stream (gpgme_data_t data, FILE *fp)
	Write a GPGME data object to a file.
static char *	data_object_to_tempfile (gpgme_data_t data, FILE **fp_ret)
	Copy a data object to a temporary file.
static void	create_recipient_string (const char *keylist, struct Buffer *recpstring, int use_smime)
	Create a string of recipients.
static bool	set_signer_from_address (gpgme_ctx_t ctx, const char *address, bool for_smime)
	Try to set the context's signer from the address.
static int	set_signer (gpgme_ctx_t ctx, const struct AddressList *al, bool for_smime)
	Make sure that the correct signer is set.
static gpgme_error_t	set_pka_sig_notation (gpgme_ctx_t ctx)
	Set the signature notation.
static char *	encrypt_gpgme_object (gpgme_data_t plaintext, char *keylist, bool use_smime, bool combined_signed, const struct AddressList *from)
	Encrypt the GPGPME data object.
static int	get_micalg (gpgme_ctx_t ctx, int use_smime, char *buf, size_t buflen)
	Find the "micalg" parameter from the last GPGME operation.
static void	print_time (time_t t, struct State *state)
	Print the date/time according to the locale.
static struct Body *	sign_message (struct Body *b, const struct AddressList *from, bool use_smime)
	Sign a message.
struct Body *	pgp_gpgme_sign_message (struct Body *b, const struct AddressList *from)
	Cryptographically sign the Body of a message - Implements CryptModuleSpecs::sign_message() -.
struct Body *	smime_gpgme_sign_message (struct Body *b, const struct AddressList *from)
	Cryptographically sign the Body of a message - Implements CryptModuleSpecs::sign_message() -.
struct Body *	pgp_gpgme_encrypt_message (struct Body *b, char *keylist, bool sign, const struct AddressList *from)
	PGP encrypt an email - Implements CryptModuleSpecs::pgp_encrypt_message() -.
struct Body *	smime_gpgme_build_smime_entity (struct Body *b, char *keylist)
	Encrypt the email body to all recipients - Implements CryptModuleSpecs::smime_build_smime_entity() -.
static int	show_sig_summary (unsigned long sum, gpgme_ctx_t ctx, gpgme_key_t key, int idx, struct State *state, gpgme_signature_t sig)
	Show a signature summary.
static void	show_fingerprint (gpgme_key_t key, struct State *state)
	Write a key's fingerprint.
static void	show_one_sig_validity (gpgme_ctx_t ctx, int idx, struct State *state)
	Show the validity of a key used for one signature.
static void	print_smime_keyinfo (const char *msg, gpgme_signature_t sig, gpgme_key_t key, struct State *state)
	Print key info about an SMIME key.
static void	show_one_recipient (struct State *state, gpgme_recipient_t r)
	Show information about one encryption recipient.
static void	show_encryption_info (struct State *state, gpgme_decrypt_result_t result)
	Show encryption information.
static int	show_one_sig_status (gpgme_ctx_t ctx, int idx, struct State *state)
	Show information about one signature.
static int	verify_one (struct Body *b, struct State *state, const char *tempfile, bool is_smime)
	Do the actual verification step.
int	pgp_gpgme_verify_one (struct Body *b, struct State *state, const char *tempfile)
	Check a signed MIME part against a signature - Implements CryptModuleSpecs::verify_one() -.
int	smime_gpgme_verify_one (struct Body *b, struct State *state, const char *tempfile)
	Check a signed MIME part against a signature - Implements CryptModuleSpecs::verify_one() -.
static struct Body *	decrypt_part (struct Body *b, struct State *state, FILE *fp_out, bool is_smime, int *r_is_signed)
	Decrypt a PGP or SMIME message.
int	pgp_gpgme_decrypt_mime (FILE *fp_in, FILE **fp_out, struct Body *b, struct Body **b_dec)
	Decrypt an encrypted MIME part - Implements CryptModuleSpecs::decrypt_mime() -.
int	smime_gpgme_decrypt_mime (FILE *fp_in, FILE **fp_out, struct Body *b, struct Body **b_dec)
	Decrypt an encrypted MIME part - Implements CryptModuleSpecs::decrypt_mime() -.
static int	pgp_gpgme_extract_keys (gpgme_data_t keydata, FILE **fp)
	Write PGP keys to a file.
static int	line_compare (const char *a, size_t n, const char *b)
	Compare two strings ignore line endings.
static int	pgp_check_traditional_one_body (FILE *fp, struct Body *b)
	Check one inline PGP body part.
bool	pgp_gpgme_check_traditional (FILE *fp, struct Body *b, bool just_one)
	Look for inline (non-MIME) PGP content - Implements CryptModuleSpecs::pgp_check_traditional() -.
void	pgp_gpgme_invoke_import (const char *fname)
	Import a key from a message into the user's public key ring - Implements CryptModuleSpecs::pgp_invoke_import() -.
static void	copy_clearsigned (gpgme_data_t data, struct State *state, char *charset)
	Copy a clearsigned message.
int	pgp_gpgme_application_handler (struct Body *b, struct State *state)
	Manage the MIME type "application/pgp" or "application/smime" - Implements CryptModuleSpecs::application_handler() -.
int	pgp_gpgme_encrypted_handler (struct Body *b, struct State *state)
	Manage a PGP or S/MIME encrypted MIME part - Implements CryptModuleSpecs::encrypted_handler() -.
int	smime_gpgme_application_handler (struct Body *b, struct State *state)
	Manage the MIME type "application/pgp" or "application/smime" - Implements CryptModuleSpecs::application_handler() -.
unsigned int	key_check_cap (gpgme_key_t key, enum KeyCap cap)
	Check the capabilities of a key.
static char *	list_to_pattern (struct ListHead *list)
	Convert STailQ to GPGME-compatible pattern.
static struct CryptKeyInfo *	get_candidates (struct ListHead *hints, SecurityFlags app, int secret)
	Get a list of keys which are candidates for the selection.
static void	crypt_add_string_to_hints (const char *str, struct ListHead *hints)
	Split a string and add the parts to a List.
static struct CryptKeyInfo *	crypt_getkeybyaddr (struct Address *a, KeyFlags abilities, unsigned int app, bool *forced_valid, bool oppenc_mode)
	Find a key by email address.
static struct CryptKeyInfo *	crypt_getkeybystr (const char *p, KeyFlags abilities, unsigned int app, bool *forced_valid)
	Find a key by string.
static struct CryptKeyInfo *	crypt_ask_for_key (const char *tag, const char *whatfor, KeyFlags abilities, unsigned int app, bool *forced_valid)
	Ask the user for a key.
static char *	find_keys (const struct AddressList *addrlist, unsigned int app, bool oppenc_mode)
	Find keys of the recipients of the message.
char *	pgp_gpgme_find_keys (const struct AddressList *addrlist, bool oppenc_mode)
	Find the keyids of the recipients of a message - Implements CryptModuleSpecs::find_keys() -.
char *	smime_gpgme_find_keys (const struct AddressList *addrlist, bool oppenc_mode)
	Find the keyids of the recipients of a message - Implements CryptModuleSpecs::find_keys() -.
int	mutt_gpgme_select_secret_key (struct Buffer *keyid)
	Select a private Autocrypt key for a new account.
struct Body *	pgp_gpgme_make_key_attachment (void)
	Generate a public key attachment - Implements CryptModuleSpecs::pgp_make_key_attachment() -.
static void	init_common (void)
	Initialise code common to PGP and SMIME parts of GPGME.
static void	init_pgp (void)
	Initialise the PGP crypto backend.
static void	init_smime (void)
	Initialise the SMIME crypto backend.
void	pgp_gpgme_init (void)
	Initialise the crypto module - Implements CryptModuleSpecs::init() -.
void	smime_gpgme_init (void)
	Initialise the crypto module - Implements CryptModuleSpecs::init() -.
static SecurityFlags	gpgme_send_menu (struct Email *e, bool is_smime)
	Show the user the encryption/signing menu.
SecurityFlags	pgp_gpgme_send_menu (struct Email *e)
	Ask the user whether to sign and/or encrypt the email - Implements CryptModuleSpecs::send_menu() -.
SecurityFlags	smime_gpgme_send_menu (struct Email *e)
	Ask the user whether to sign and/or encrypt the email - Implements CryptModuleSpecs::send_menu() -.
static bool	verify_sender (struct Email *e)
	Verify the sender of a message.
int	smime_gpgme_verify_sender (struct Email *e, struct Message *msg)
	Does the sender match the certificate? - Implements CryptModuleSpecs::smime_verify_sender() -.
void	pgp_gpgme_set_sender (const char *sender)
	Set the sender of the email - Implements CryptModuleSpecs::set_sender() -.
const char *	mutt_gpgme_print_version (void)
	Get version of GPGME.

Variables
static struct CryptCache *	IdDefaults = NULL
	Cache of GPGME keys.
static gpgme_key_t	SignatureKey = NULL
	PGP Key to sign with.
static char *	CurrentSender = NULL
	Email address of the sender.

Detailed Description

Wrapper for PGP/SMIME calls to GPGME.

Authors

• Pietro Cerutti
• Richard Russon
• Federico Kircheis
• Ian Zimmerman
• ftilde
• Anna Figueiredo Gomes
• Alejandro Colomar

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file crypt_gpgme.c.

Macro Definition Documentation

CRYPT_KV_VALID

#define CRYPT_KV_VALID   (1 << 0)

Definition at line 74 of file crypt_gpgme.c.

CRYPT_KV_ADDR

#define CRYPT_KV_ADDR   (1 << 1)

Definition at line 75 of file crypt_gpgme.c.

CRYPT_KV_STRING

#define CRYPT_KV_STRING   (1 << 2)

Definition at line 76 of file crypt_gpgme.c.

CRYPT_KV_STRONGID

#define CRYPT_KV_STRONGID   (1 << 3)

Definition at line 77 of file crypt_gpgme.c.

CRYPT_KV_MATCH

#define CRYPT_KV_MATCH   (CRYPT_KV_ADDR | CRYPT_KV_STRING)

Definition at line 78 of file crypt_gpgme.c.

PKA_NOTATION_NAME

#define PKA_NOTATION_NAME   "pka-address@gnupg.org"

Definition at line 98 of file crypt_gpgme.c.

_LINE_COMPARE

#define _LINE_COMPARE	(		_x,
			_y
	)		line_compare(_x, sizeof(_x) - 1, _y)

Definition at line 100 of file crypt_gpgme.c.

MESSAGE

#define MESSAGE

(

_y

)

_LINE_COMPARE("MESSAGE-----", _y)

Definition at line 101 of file crypt_gpgme.c.

SIGNED_MESSAGE

#define SIGNED_MESSAGE

(

_y

)

_LINE_COMPARE("SIGNED MESSAGE-----", _y)

Definition at line 102 of file crypt_gpgme.c.

PUBLIC_KEY_BLOCK

#define PUBLIC_KEY_BLOCK

(

_y

)

_LINE_COMPARE("PUBLIC KEY BLOCK-----", _y)

Definition at line 103 of file crypt_gpgme.c.

BEGIN_PGP_SIGNATURE

#define BEGIN_PGP_SIGNATURE

(

_y

)

_LINE_COMPARE("-----BEGIN PGP SIGNATURE-----", _y)

Definition at line 104 of file crypt_gpgme.c.

Function Documentation

is_pka_notation()

static bool is_pka_notation ( gpgme_sig_notation_t  notation )

static

Is this the standard pka email address.

Parameters

notation

GPGME notation

Return values

true	It is the standard pka email address

Definition at line 112 of file crypt_gpgme.c.

{
  return mutt_str_equal(notation->name, PKA_NOTATION_NAME);
}

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redraw_if_needed()

static void redraw_if_needed ( gpgme_ctx_t  ctx )

static

Accommodate for a redraw if needed.

Parameters

ctx	GPGME handle

Definition at line 121 of file crypt_gpgme.c.

{
  const char *s = gpgme_get_ctx_flag(ctx, "redraw");
  if (!s /* flag not known */ || *s /* flag true */)
  {
    mutt_need_hard_redraw();
  }
}

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crypt_keyid()

const char * crypt_keyid

(

struct CryptKeyInfo *

k

)

Find the ID for the key.

Parameters

k	Key to use

Return values

ptr	ID string for the key

Return the keyID for the key K. Note that this string is valid as long as K is valid

Definition at line 138 of file crypt_gpgme.c.

{
  const char *s = "????????";
 
  if (k->kobj && k->kobj->subkeys)
  {
    s = k->kobj->subkeys->keyid;
    const bool c_pgp_long_ids = cs_subset_bool(NeoMutt->sub, "pgp_long_ids");
    if ((!c_pgp_long_ids) && (strlen(s) == 16))
    {
      /* Return only the short keyID.  */
      s += 8;
    }
  }
 
  return s;
}

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crypt_long_keyid()

static const char * crypt_long_keyid ( struct CryptKeyInfo *  k )

static

Find the Long ID for the key.

Parameters

k	Key to use

Return values

ptr	Long ID string for the key

Return the long keyID for the key K.

Definition at line 163 of file crypt_gpgme.c.

{
  const char *s = "????????????????";
 
  if (k->kobj && k->kobj->subkeys)
  {
    s = k->kobj->subkeys->keyid;
  }
 
  return s;
}

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crypt_short_keyid()

static const char * crypt_short_keyid ( struct CryptKeyInfo *  k )

static

Get the short keyID for a key.

Parameters

k	Key to use

Return values

ptr	Short key string

Definition at line 180 of file crypt_gpgme.c.

{
  const char *s = "????????";
 
  if (k->kobj && k->kobj->subkeys)
  {
    s = k->kobj->subkeys->keyid;
    if (strlen(s) == 16)
      s += 8;
  }
 
  return s;
}

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crypt_fpr()

static const char * crypt_fpr ( struct CryptKeyInfo *  k )

static

Get the hexstring fingerprint from a key.

Parameters

k	Key to use

Return values

ptr	Hexstring fingerprint

Definition at line 199 of file crypt_gpgme.c.

{
  const char *s = "";
 
  if (k->kobj && k->kobj->subkeys)
    s = k->kobj->subkeys->fpr;
 
  return s;
}

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crypt_fpr_or_lkeyid()

const char * crypt_fpr_or_lkeyid

(

struct CryptKeyInfo *

k

)

Find the fingerprint of a key.

Parameters

k	Key to examine

Return values

ptr	Fingerprint if available, otherwise the long keyid

Definition at line 214 of file crypt_gpgme.c.

{
  const char *s = "????????????????";
 
  if (k->kobj && k->kobj->subkeys)
  {
    if (k->kobj->subkeys->fpr)
      s = k->kobj->subkeys->fpr;
    else
      s = k->kobj->subkeys->keyid;
  }
 
  return s;
}

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crypt_copy_key()

struct CryptKeyInfo * crypt_copy_key

(

struct CryptKeyInfo *

key

)

Return a copy of KEY.

Parameters

key	Key to copy

Return values

ptr	Copy of key

Definition at line 234 of file crypt_gpgme.c.

{
  struct CryptKeyInfo *k = NULL;
 
  k = MUTT_MEM_CALLOC(1, struct CryptKeyInfo);
  k->kobj = key->kobj;
  gpgme_key_ref(key->kobj);
  k->idx = key->idx;
  k->uid = key->uid;
  k->flags = key->flags;
  k->validity = key->validity;
 
  return k;
}

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crypt_key_free()

static void crypt_key_free ( struct CryptKeyInfo **  keylist )

static

Release all the keys in a list.

Parameters

[out]

keylist

List of keys

Definition at line 253 of file crypt_gpgme.c.

{
  if (!keylist)
    return;
 
  struct CryptKeyInfo *k = NULL;
 
  while (*keylist)
  {
    k = *keylist;
    *keylist = (*keylist)->next;
 
    gpgme_key_unref(k->kobj);
    FREE(&k);
  }
}

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crypt_id_is_strong()

bool crypt_id_is_strong

(

struct CryptKeyInfo *

key

)

Is the key strong.

Parameters

key	Key to test

Return values

true	Validity of key is sufficient

Definition at line 275 of file crypt_gpgme.c.

{
  if (!key)
    return false;
 
  bool is_strong = false;
 
  if ((key->flags & KEYFLAG_ISX509))
    return true;
 
  switch (key->validity)
  {
    case GPGME_VALIDITY_MARGINAL:
    case GPGME_VALIDITY_NEVER:
    case GPGME_VALIDITY_UNDEFINED:
    case GPGME_VALIDITY_UNKNOWN:
      is_strong = false;
      break;
 
    case GPGME_VALIDITY_FULL:
    case GPGME_VALIDITY_ULTIMATE:
      is_strong = true;
      break;
  }
 
  return is_strong;
}

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crypt_id_is_valid()

int crypt_id_is_valid

(

struct CryptKeyInfo *

key

)

Is key ID valid.

Parameters

key	Key to test

Return values

true	Key is valid

When the key is not marked as unusable

Definition at line 310 of file crypt_gpgme.c.

{
  if (!key)
    return 0;
 
  return !(key->flags & KEYFLAG_CANTUSE);
}

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crypt_id_matches_addr()

static int crypt_id_matches_addr ( struct Address *  addr, struct Address *  u_addr, struct CryptKeyInfo *  key  )

static

Does the key ID match the address.

Parameters

addr	First email address
u_addr	Second email address
key	Key to use

Return values

num	Flags, e.g. CRYPT_KV_VALID

Return a bit vector describing how well the addresses ADDR and U_ADDR match and whether KEY is valid.

Definition at line 328 of file crypt_gpgme.c.

{
  int rc = 0;
 
  if (crypt_id_is_valid(key))
    rc |= CRYPT_KV_VALID;
 
  if (crypt_id_is_strong(key))
    rc |= CRYPT_KV_STRONGID;
 
  if (addr && u_addr)
  {
    if (addr->mailbox && u_addr->mailbox && buf_istr_equal(addr->mailbox, u_addr->mailbox))
    {
      rc |= CRYPT_KV_ADDR;
    }
 
    if (addr->personal && u_addr->personal &&
        buf_istr_equal(addr->personal, u_addr->personal))
    {
      rc |= CRYPT_KV_STRING;
    }
  }
 
  return rc;
}

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create_gpgme_context()

gpgme_ctx_t create_gpgme_context

(

bool

for_smime

)

Create a new GPGME context.

Parameters

for_smime

If true, protocol of the context is set to CMS

Return values

ptr	New GPGME context

Definition at line 361 of file crypt_gpgme.c.

{
  gpgme_ctx_t ctx = NULL;
 
  gpgme_error_t err = gpgme_new(&ctx);
 
#ifdef USE_AUTOCRYPT
  const char *const c_autocrypt_dir = cs_subset_path(NeoMutt->sub, "autocrypt_dir");
  if ((err == GPG_ERR_NO_ERROR) && OptAutocryptGpgme)
    err = gpgme_ctx_set_engine_info(ctx, GPGME_PROTOCOL_OpenPGP, NULL, c_autocrypt_dir);
#endif
 
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error creating GPGME context: %s"), gpgme_strerror(err));
    mutt_exit(1);
  }
 
  if (for_smime)
  {
    err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
    if (err != GPG_ERR_NO_ERROR)
    {
      mutt_error(_("error enabling CMS protocol: %s"), gpgme_strerror(err));
      mutt_exit(1);
    }
  }
 
  return ctx;
}

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create_gpgme_data()

static gpgme_data_t create_gpgme_data ( void  )

static

Create a new GPGME data object.

Return values

ptr	GPGPE data object

This is a wrapper to die on error.

Note

Call gpgme_data_release() to free the data object

Definition at line 400 of file crypt_gpgme.c.

{
  gpgme_data_t data = NULL;
 
  gpgme_error_t err = gpgme_data_new(&data);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error creating GPGME data object: %s"), gpgme_strerror(err));
    mutt_exit(1);
  }
  return data;
}

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body_to_data_object()

static gpgme_data_t body_to_data_object ( struct Body *  b, bool  convert  )

static

Create GPGME object from the mail body.

Parameters

b	Body to use
convert	If true, lines are converted to CR-LF if required

Return values

ptr	Newly created GPGME data object

Definition at line 419 of file crypt_gpgme.c.

{
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  gpgme_data_t data = NULL;
 
  struct Buffer *tempfile = buf_pool_get();
  buf_mktemp(tempfile);
  FILE *fp_tmp = mutt_file_fopen(buf_string(tempfile), "w+");
  if (!fp_tmp)
  {
    mutt_perror("%s", buf_string(tempfile));
    goto cleanup;
  }
 
  mutt_write_mime_header(b, fp_tmp, NeoMutt->sub);
  fputc('\n', fp_tmp);
  mutt_write_mime_body(b, fp_tmp, NeoMutt->sub);
 
  if (convert)
  {
    int c, hadcr = 0;
    unsigned char buf[1];
 
    data = create_gpgme_data();
    rewind(fp_tmp);
    while ((c = fgetc(fp_tmp)) != EOF)
    {
      if (c == '\r')
      {
        hadcr = 1;
      }
      else
      {
        if ((c == '\n') && !hadcr)
        {
          buf[0] = '\r';
          gpgme_data_write(data, buf, 1);
        }
 
        hadcr = 0;
      }
      /* FIXME: This is quite suboptimal */
      buf[0] = c;
      gpgme_data_write(data, buf, 1);
    }
    mutt_file_fclose(&fp_tmp);
    gpgme_data_seek(data, 0, SEEK_SET);
  }
  else
  {
    mutt_file_fclose(&fp_tmp);
    err = gpgme_data_new_from_file(&data, buf_string(tempfile), 1);
    if (err != GPG_ERR_NO_ERROR)
    {
      mutt_error(_("error allocating data object: %s"), gpgme_strerror(err));
      gpgme_data_release(data);
      data = NULL;
      /* fall through to unlink the tempfile */
    }
  }
  unlink(buf_string(tempfile));
 
cleanup:
  buf_pool_release(&tempfile);
  return data;
}

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file_to_data_object()

static gpgme_data_t file_to_data_object ( FILE *  fp, long  offset, size_t  length  )

static

Create GPGME data object from file.

Parameters

fp	File to read from
offset	Offset to start reading from
length	Length of data to read

Return values

ptr	Newly created GPGME data object

Definition at line 493 of file crypt_gpgme.c.

{
  gpgme_data_t data = NULL;
 
  gpgme_error_t err = gpgme_data_new_from_filepart(&data, NULL, fp, offset, length);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error allocating data object: %s"), gpgme_strerror(err));
    return NULL;
  }
 
  return data;
}

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data_object_to_stream()

static int data_object_to_stream ( gpgme_data_t  data, FILE *  fp  )

static

Write a GPGME data object to a file.

Parameters

data	GPGME data object
fp	File to write to

Return values

0	Success
-1	Error

Definition at line 514 of file crypt_gpgme.c.

{
  char buf[4096] = { 0 };
  ssize_t nread;
 
  gpgme_error_t err = ((gpgme_data_seek(data, 0, SEEK_SET) == -1) ?
                           gpgme_error_from_errno(errno) :
                           GPG_ERR_NO_ERROR);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error rewinding data object: %s"), gpgme_strerror(err));
    return -1;
  }
 
  while ((nread = gpgme_data_read(data, buf, sizeof(buf))) > 0)
  {
    /* fixme: we are not really converting CRLF to LF but just
     * skipping CR. Doing it correctly needs a more complex logic */
    for (char *p = buf; nread; p++, nread--)
    {
      if (*p != '\r')
        putc(*p, fp);
    }
 
    if (ferror(fp))
    {
      mutt_perror(_("[tempfile]"));
      return -1;
    }
  }
  if (nread == -1)
  {
    mutt_error(_("error reading data object: %s"), strerror(errno));
    return -1;
  }
  return 0;
}

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data_object_to_tempfile()

static char * data_object_to_tempfile ( gpgme_data_t  data, FILE **  fp_ret  )

static

Copy a data object to a temporary file.

Parameters

[in]	data	GPGME data object
[out]	fp_ret	Temporary file

Return values

ptr	Name of temporary file

If fp_ret is passed in, the file will be rewound, left open, and returned via that parameter.

Note

The caller must free the returned file name

Definition at line 563 of file crypt_gpgme.c.

{
  ssize_t nread = 0;
  char *rv = NULL;
  struct Buffer *tempfile = buf_pool_get();
 
  buf_mktemp(tempfile);
 
  FILE *fp = mutt_file_fopen(buf_string(tempfile), "w+");
  if (!fp)
  {
    mutt_perror(_("Can't create temporary file"));
    goto cleanup;
  }
 
  gpgme_error_t err = ((gpgme_data_seek(data, 0, SEEK_SET) == -1) ?
                           gpgme_error_from_errno(errno) :
                           GPG_ERR_NO_ERROR);
  if (err == GPG_ERR_NO_ERROR)
  {
    char buf[4096] = { 0 };
 
    while ((nread = gpgme_data_read(data, buf, sizeof(buf))) > 0)
    {
      if (fwrite(buf, nread, 1, fp) != 1)
      {
        mutt_perror("%s", buf_string(tempfile));
        mutt_file_fclose(&fp);
        unlink(buf_string(tempfile));
        goto cleanup;
      }
    }
  }
  if (fp_ret)
    rewind(fp);
  else
    mutt_file_fclose(&fp);
  if (nread == -1)
  {
    mutt_error(_("error reading data object: %s"), gpgme_strerror(err));
    unlink(buf_string(tempfile));
    mutt_file_fclose(&fp);
    goto cleanup;
  }
  if (fp_ret)
    *fp_ret = fp;
  rv = buf_strdup(tempfile);
 
cleanup:
  buf_pool_release(&tempfile);
  return rv;
}

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create_recipient_string()

static void create_recipient_string ( const char *  keylist, struct Buffer *  recpstring, int  use_smime  )

static

Create a string of recipients.

Parameters

keylist	Keys, space-separated
recpstring	Buffer to store the recipients
use_smime	Use SMIME

Definition at line 622 of file crypt_gpgme.c.

{
  unsigned int n = 0;
 
  const char *s = keylist;
  do
  {
    while (*s == ' ')
      s++;
    if (*s != '\0')
    {
      if (n == 0)
      {
        if (!use_smime)
          buf_addstr(recpstring, "--\n");
      }
      else
      {
        buf_addch(recpstring, '\n');
      }
      n++;
 
      while ((*s != '\0') && (*s != ' '))
        buf_addch(recpstring, *s++);
    }
  } while (*s != '\0');
}

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set_signer_from_address()

static bool set_signer_from_address ( gpgme_ctx_t  ctx, const char *  address, bool  for_smime  )

static

Try to set the context's signer from the address.

Parameters

ctx	GPGME handle
address	Address to try to set as a signer
for_smime	Use S/MIME

Return values

true	Address was set as a signer
false	Address could not be set as a signer

Definition at line 658 of file crypt_gpgme.c.

{
  gpgme_key_t key = NULL;
  gpgme_key_t key2 = NULL;
 
  gpgme_ctx_t listctx = create_gpgme_context(for_smime);
  gpgme_error_t err = gpgme_op_keylist_start(listctx, address, 1);
  if (err == GPG_ERR_NO_ERROR)
    err = gpgme_op_keylist_next(listctx, &key);
  if (err != GPG_ERR_NO_ERROR)
  {
    gpgme_release(listctx);
    mutt_error(_("secret key '%s' not found: %s"), address, gpgme_strerror(err));
    return false;
  }
 
  char *fpr = "fpr1";
  if (key->subkeys)
    fpr = key->subkeys->fpr ? key->subkeys->fpr : key->subkeys->keyid;
  while (gpgme_op_keylist_next(listctx, &key2) == 0)
  {
    char *fpr2 = "fpr2";
    if (key2->subkeys)
      fpr2 = key2->subkeys->fpr ? key2->subkeys->fpr : key2->subkeys->keyid;
    if (!mutt_str_equal(fpr, fpr2))
    {
      gpgme_key_unref(key);
      gpgme_key_unref(key2);
      gpgme_release(listctx);
      mutt_error(_("ambiguous specification of secret key '%s'"), address);
      return false;
    }
    else
    {
      gpgme_key_unref(key2);
    }
  }
  gpgme_op_keylist_end(listctx);
  gpgme_release(listctx);
 
  gpgme_signers_clear(ctx);
  err = gpgme_signers_add(ctx, key);
  gpgme_key_unref(key);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error setting secret key '%s': %s"), address, gpgme_strerror(err));
    return false;
  }
  return true;
}

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set_signer()

static int set_signer ( gpgme_ctx_t  ctx, const struct AddressList *  al, bool  for_smime  )

static

Make sure that the correct signer is set.

Parameters

ctx	GPGME handle
al	From AddressList
for_smime	Use S/MIME

Return values

0	Success
-1	Error

Definition at line 717 of file crypt_gpgme.c.

{
  const char *signid = NULL;
 
  const char *const c_smime_sign_as = cs_subset_string(NeoMutt->sub, "smime_sign_as");
  const char *const c_pgp_sign_as = cs_subset_string(NeoMutt->sub, "pgp_sign_as");
  const char *const c_pgp_default_key = cs_subset_string(NeoMutt->sub, "pgp_default_key");
  const char *const c_smime_default_key = cs_subset_string(NeoMutt->sub, "smime_default_key");
  if (for_smime)
    signid = c_smime_sign_as ? c_smime_sign_as : c_smime_default_key;
#ifdef USE_AUTOCRYPT
  else if (OptAutocryptGpgme)
    signid = AutocryptSignAs;
#endif
  else
    signid = c_pgp_sign_as ? c_pgp_sign_as : c_pgp_default_key;
 
  /* Try getting the signing key from config entries */
  if (signid && set_signer_from_address(ctx, signid, for_smime))
  {
    return 0;
  }
 
  /* Try getting the signing key from the From line */
  if (al)
  {
    struct Address *a;
    TAILQ_FOREACH(a, al, entries)
    {
      if (a->mailbox && set_signer_from_address(ctx, buf_string(a->mailbox), for_smime))
      {
        return 0;
      }
    }
  }
 
  return (!signid && !al) ? 0 : -1;
}

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set_pka_sig_notation()

static gpgme_error_t set_pka_sig_notation ( gpgme_ctx_t  ctx )

static

Set the signature notation.

Parameters

ctx	GPGME context

Return values

num	GPGME error code, e.g. GPG_ERR_NO_ERROR

Definition at line 761 of file crypt_gpgme.c.

{
  gpgme_error_t err = gpgme_sig_notation_add(ctx, PKA_NOTATION_NAME, CurrentSender, 0);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error setting PKA signature notation: %s"), gpgme_strerror(err));
  }
 
  return err;
}

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encrypt_gpgme_object()

static char * encrypt_gpgme_object ( gpgme_data_t  plaintext, char *  keylist, bool  use_smime, bool  combined_signed, const struct AddressList *  from  )

static

Encrypt the GPGPME data object.

Parameters

plaintext	GPGME data object with plain text message
keylist	List of keys to encrypt to
use_smime	If true, use SMIME
combined_signed	If true, sign and encrypt the message (PGP only)
from	The From header line

Return values

ptr	Name of temporary file containing encrypted text

Definition at line 781 of file crypt_gpgme.c.

{
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  gpgme_ctx_t ctx = NULL;
  gpgme_data_t ciphertext = NULL;
  char *outfile = NULL;
 
  struct Buffer *recpstring = buf_pool_get();
  create_recipient_string(keylist, recpstring, use_smime);
  if (buf_is_empty(recpstring))
  {
    buf_pool_release(&recpstring);
    return NULL;
  }
 
  ctx = create_gpgme_context(use_smime);
  if (!use_smime)
    gpgme_set_armor(ctx, 1);
 
  ciphertext = create_gpgme_data();
 
  if (combined_signed)
  {
    if (set_signer(ctx, from, use_smime))
      goto cleanup;
 
    const bool c_crypt_use_pka = cs_subset_bool(NeoMutt->sub, "crypt_use_pka");
    if (c_crypt_use_pka)
    {
      err = set_pka_sig_notation(ctx);
      if (err != GPG_ERR_NO_ERROR)
        goto cleanup;
    }
 
    err = gpgme_op_encrypt_sign_ext(ctx, NULL, buf_string(recpstring),
                                    GPGME_ENCRYPT_ALWAYS_TRUST, plaintext, ciphertext);
  }
  else
  {
    err = gpgme_op_encrypt_ext(ctx, NULL, buf_string(recpstring),
                               GPGME_ENCRYPT_ALWAYS_TRUST, plaintext, ciphertext);
  }
 
  redraw_if_needed(ctx);
  if (err != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("error encrypting data: %s"), gpgme_strerror(err));
    goto cleanup;
  }
 
  outfile = data_object_to_tempfile(ciphertext, NULL);
 
cleanup:
  buf_pool_release(&recpstring);
  gpgme_release(ctx);
  gpgme_data_release(ciphertext);
  return outfile;
}

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get_micalg()

static int get_micalg ( gpgme_ctx_t  ctx, int  use_smime, char *  buf, size_t  buflen  )

static

Find the "micalg" parameter from the last GPGME operation.

Parameters

ctx	GPGME handle
use_smime	If set, use SMIME instead of PGP
buf	Buffer for the result
buflen	Length of buffer

Return values

0	Success
-1	Error

Find the "Message Integrity Check algorithm" from the last GPGME operation. It is expected that this operation was a sign operation.

Definition at line 853 of file crypt_gpgme.c.

{
  gpgme_sign_result_t result = NULL;
  const char *algorithm_name = NULL;
 
  if (buflen < 5)
    return -1;
 
  *buf = '\0';
  result = gpgme_op_sign_result(ctx);
  if (result && result->signatures)
  {
    algorithm_name = gpgme_hash_algo_name(result->signatures->hash_algo);
    if (algorithm_name)
    {
      if (use_smime)
      {
        /* convert GPGME raw hash name to RFC2633 format */
        snprintf(buf, buflen, "%s", algorithm_name);
        mutt_str_lower(buf);
      }
      else
      {
        /* convert GPGME raw hash name to RFC3156 format */
        snprintf(buf, buflen, "pgp-%s", algorithm_name);
        mutt_str_lower(buf + 4);
      }
    }
  }
 
  return (buf[0] != '\0') ? 0 : -1;
}

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print_time()

static void print_time ( time_t  t, struct State *  state  )

static

Print the date/time according to the locale.

Parameters

t	Timestamp
state	State to write to

Definition at line 891 of file crypt_gpgme.c.

{
  char p[256] = { 0 };
  mutt_date_localtime_format(p, sizeof(p), nl_langinfo(D_T_FMT), t);
  state_puts(state, p);
}

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sign_message()

static struct Body * sign_message ( struct Body *  b, const struct AddressList *  from, bool  use_smime  )

static

Sign a message.

Parameters

b	Message to sign
from	The From header line
use_smime	If set, use SMIME instead of PGP

Return values

ptr	new Body
NULL	error

Definition at line 906 of file crypt_gpgme.c.

{
  struct Body *b_sign = NULL;
  char *sigfile = NULL;
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  char buf[100] = { 0 };
  gpgme_ctx_t ctx = NULL;
  gpgme_data_t message = NULL, signature = NULL;
  gpgme_sign_result_t sigres = NULL;
 
  crypt_convert_to_7bit(b); /* Signed data _must_ be in 7-bit format. */
 
  message = body_to_data_object(b, true);
  if (!message)
    return NULL;
  signature = create_gpgme_data();
 
  ctx = create_gpgme_context(use_smime);
  if (!use_smime)
    gpgme_set_armor(ctx, 1);
 
  if (set_signer(ctx, from, use_smime))
  {
    gpgme_data_release(signature);
    gpgme_data_release(message);
    gpgme_release(ctx);
    return NULL;
  }
 
  const bool c_crypt_use_pka = cs_subset_bool(NeoMutt->sub, "crypt_use_pka");
  if (c_crypt_use_pka)
  {
    err = set_pka_sig_notation(ctx);
    if (err != GPG_ERR_NO_ERROR)
    {
      gpgme_data_release(signature);
      gpgme_data_release(message);
      gpgme_release(ctx);
      return NULL;
    }
  }
 
  err = gpgme_op_sign(ctx, message, signature, GPGME_SIG_MODE_DETACH);
  redraw_if_needed(ctx);
  gpgme_data_release(message);
  if (err != GPG_ERR_NO_ERROR)
  {
    gpgme_data_release(signature);
    gpgme_release(ctx);
    mutt_error(_("error signing data: %s"), gpgme_strerror(err));
    return NULL;
  }
  /* Check for zero signatures generated.  This can occur when $pgp_sign_as is
   * unset and there is no default key specified in ~/.gnupg/gpg.conf */
  sigres = gpgme_op_sign_result(ctx);
  if (!sigres->signatures)
  {
    gpgme_data_release(signature);
    gpgme_release(ctx);
    mutt_error(_("$pgp_sign_as unset and no default key specified in ~/.gnupg/gpg.conf"));
    return NULL;
  }
 
  sigfile = data_object_to_tempfile(signature, NULL);
  gpgme_data_release(signature);
  if (!sigfile)
  {
    gpgme_release(ctx);
    return NULL;
  }
 
  b_sign = mutt_body_new();
  b_sign->type = TYPE_MULTIPART;
  b_sign->subtype = mutt_str_dup("signed");
  b_sign->encoding = ENC_7BIT;
  b_sign->use_disp = false;
  b_sign->disposition = DISP_INLINE;
 
  mutt_generate_boundary(&b_sign->parameter);
  mutt_param_set(&b_sign->parameter, "protocol",
                 use_smime ? "application/pkcs7-signature" : "application/pgp-signature");
  /* Get the micalg from GPGME.  Old gpgme versions don't support this
   * for S/MIME so we assume sha-1 in this case. */
  if (get_micalg(ctx, use_smime, buf, sizeof(buf)) == 0)
    mutt_param_set(&b_sign->parameter, "micalg", buf);
  else if (use_smime)
    mutt_param_set(&b_sign->parameter, "micalg", "sha1");
  gpgme_release(ctx);
 
  b_sign->parts = b;
  b = b_sign;
 
  b_sign->parts->next = mutt_body_new();
  b_sign = b_sign->parts->next;
  b_sign->type = TYPE_APPLICATION;
  if (use_smime)
  {
    b_sign->subtype = mutt_str_dup("pkcs7-signature");
    mutt_param_set(&b_sign->parameter, "name", "smime.p7s");
    b_sign->encoding = ENC_BASE64;
    b_sign->use_disp = true;
    b_sign->disposition = DISP_ATTACH;
    b_sign->d_filename = mutt_str_dup("smime.p7s");
  }
  else
  {
    b_sign->subtype = mutt_str_dup("pgp-signature");
    mutt_param_set(&b_sign->parameter, "name", "signature.asc");
    b_sign->use_disp = false;
    b_sign->disposition = DISP_NONE;
    b_sign->encoding = ENC_7BIT;
  }
  b_sign->filename = sigfile;
  b_sign->unlink = true; /* ok to remove this file after sending. */
 
  return b;
}

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show_sig_summary()

static int show_sig_summary ( unsigned long  sum, gpgme_ctx_t  ctx, gpgme_key_t  key, int  idx, struct State *  state, gpgme_signature_t  sig  )

static

Show a signature summary.

Parameters

sum	Flags, e.g. GPGME_SIGSUM_KEY_REVOKED
ctx	GPGME handle
key	Set of keys
idx	Index into key set
state	State to use
sig	GPGME signature

Return values

0	Success
1	There is a severe warning

Display the common attributes of the signature summary SUM.

Definition at line 1133 of file crypt_gpgme.c.

{
  if (!key)
    return 1;
 
  bool severe = false;
 
  if ((sum & GPGME_SIGSUM_KEY_REVOKED))
  {
    state_puts(state, _("Warning: One of the keys has been revoked\n"));
    severe = true;
  }
 
  if ((sum & GPGME_SIGSUM_KEY_EXPIRED))
  {
    time_t at = key->subkeys->expires ? key->subkeys->expires : 0;
    if (at)
    {
      state_puts(state, _("Warning: The key used to create the signature expired at: "));
      print_time(at, state);
      state_puts(state, "\n");
    }
    else
    {
      state_puts(state, _("Warning: At least one certification key has expired\n"));
    }
  }
 
  if ((sum & GPGME_SIGSUM_SIG_EXPIRED))
  {
    gpgme_signature_t sig2 = NULL;
    unsigned int i;
 
    gpgme_verify_result_t result = gpgme_op_verify_result(ctx);
 
    for (sig2 = result->signatures, i = 0; sig2 && (i < idx); sig2 = sig2->next, i++)
      ; // do nothing
 
    state_puts(state, _("Warning: The signature expired at: "));
    print_time(sig2 ? sig2->exp_timestamp : 0, state);
    state_puts(state, "\n");
  }
 
  if ((sum & GPGME_SIGSUM_KEY_MISSING))
  {
    state_puts(state, _("Can't verify due to a missing key or certificate\n"));
  }
 
  if ((sum & GPGME_SIGSUM_CRL_MISSING))
  {
    state_puts(state, _("The CRL is not available\n"));
    severe = true;
  }
 
  if ((sum & GPGME_SIGSUM_CRL_TOO_OLD))
  {
    state_puts(state, _("Available CRL is too old\n"));
    severe = true;
  }
 
  if ((sum & GPGME_SIGSUM_BAD_POLICY))
    state_puts(state, _("A policy requirement was not met\n"));
 
  if ((sum & GPGME_SIGSUM_SYS_ERROR))
  {
    const char *t0 = NULL, *t1 = NULL;
    gpgme_verify_result_t result = NULL;
    gpgme_signature_t sig2 = NULL;
    unsigned int i;
 
    state_puts(state, _("A system error occurred"));
 
    /* Try to figure out some more detailed system error information. */
    result = gpgme_op_verify_result(ctx);
    for (sig2 = result->signatures, i = 0; sig2 && (i < idx); sig2 = sig2->next, i++)
      ; // do nothing
 
    if (sig2)
    {
      t0 = "";
      t1 = sig2->wrong_key_usage ? "Wrong_Key_Usage" : "";
    }
 
    if (t0 || t1)
    {
      state_puts(state, ": ");
      if (t0)
        state_puts(state, t0);
      if (t1 && !(t0 && (mutt_str_equal(t0, t1))))
      {
        if (t0)
          state_puts(state, ",");
        state_puts(state, t1);
      }
    }
    state_puts(state, "\n");
  }
 
  const bool c_crypt_use_pka = cs_subset_bool(NeoMutt->sub, "crypt_use_pka");
  if (c_crypt_use_pka)
  {
    if ((sig->pka_trust == 1) && sig->pka_address)
    {
      state_puts(state, _("WARNING: PKA entry does not match signer's address: "));
      state_puts(state, sig->pka_address);
      state_puts(state, "\n");
    }
    else if ((sig->pka_trust == 2) && sig->pka_address)
    {
      state_puts(state, _("PKA verified signer's address is: "));
      state_puts(state, sig->pka_address);
      state_puts(state, "\n");
    }
  }
 
  return severe;
}

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show_fingerprint()

static void show_fingerprint ( gpgme_key_t  key, struct State *  state  )

static

Write a key's fingerprint.

Parameters

key	GPGME key
state	State to write to

Definition at line 1257 of file crypt_gpgme.c.

{
  if (!key)
    return;
 
  const char *prefix = _("Fingerprint: ");
 
  const char *s = key->subkeys ? key->subkeys->fpr : NULL;
  if (!s)
    return;
  bool is_pgp = (key->protocol == GPGME_PROTOCOL_OpenPGP);
 
  char *buf = MUTT_MEM_MALLOC(strlen(prefix) + strlen(s) * 4 + 2, char);
  strcpy(buf, prefix);
  char *p = buf + strlen(buf);
  if (is_pgp && (strlen(s) == 40))
  { /* PGP v4 style formatted. */
    for (int i = 0; *s && s[1] && s[2] && s[3] && s[4]; s += 4, i++)
    {
      *p++ = s[0];
      *p++ = s[1];
      *p++ = s[2];
      *p++ = s[3];
      *p++ = ' ';
      if (i == 4)
        *p++ = ' ';
    }
  }
  else
  {
    for (int i = 0; *s && s[1] && s[2]; s += 2, i++)
    {
      *p++ = s[0];
      *p++ = s[1];
      *p++ = is_pgp ? ' ' : ':';
      if (is_pgp && (i == 7))
        *p++ = ' ';
    }
  }
 
  /* just in case print remaining odd digits */
  for (; *s; s++)
    *p++ = *s;
  *p++ = '\n';
  *p = '\0';
  state_puts(state, buf);
  FREE(&buf);
}

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show_one_sig_validity()

static void show_one_sig_validity ( gpgme_ctx_t  ctx, int  idx, struct State *  state  )

static

Show the validity of a key used for one signature.

Parameters

ctx	GPGME handle
idx	Index of signature to check
state	State to use

Definition at line 1312 of file crypt_gpgme.c.

{
  gpgme_signature_t sig = NULL;
  const char *txt = NULL;
 
  gpgme_verify_result_t result = gpgme_op_verify_result(ctx);
  if (result)
    for (sig = result->signatures; sig && (idx > 0); sig = sig->next, idx--)
      ; // do nothing
 
  switch (sig ? sig->validity : 0)
  {
    case GPGME_VALIDITY_UNKNOWN:
      txt = _("WARNING: We have NO indication whether the key belongs to the person named as shown above\n");
      break;
    case GPGME_VALIDITY_UNDEFINED:
      break;
    case GPGME_VALIDITY_NEVER:
      txt = _("WARNING: The key does NOT BELONG to the person named as shown above\n");
      break;
    case GPGME_VALIDITY_MARGINAL:
      txt = _("WARNING: It is NOT certain that the key belongs to the person named as shown above\n");
      break;
    case GPGME_VALIDITY_FULL:
    case GPGME_VALIDITY_ULTIMATE:
      txt = NULL;
      break;
  }
  if (txt)
    state_puts(state, txt);
}

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print_smime_keyinfo()

static void print_smime_keyinfo ( const char *  msg, gpgme_signature_t  sig, gpgme_key_t  key, struct State *  state  )

static

Print key info about an SMIME key.

Parameters

msg	Prefix message to write
sig	GPGME signature
key	GPGME key
state	State to write to

Definition at line 1351 of file crypt_gpgme.c.

{
  int msgwid;
 
  state_puts(state, msg);
  state_puts(state, " ");
  /* key is NULL when not present in the user's keyring */
  if (key)
  {
    bool aka = false;
    for (gpgme_user_id_t uids = key->uids; uids; uids = uids->next)
    {
      if (uids->revoked)
        continue;
      if (aka)
      {
        msgwid = mutt_strwidth(msg) - mutt_strwidth(_("aka: ")) + 1;
        if (msgwid < 0)
          msgwid = 0;
        for (int i = 0; i < msgwid; i++)
          state_puts(state, " ");
        state_puts(state, _("aka: "));
      }
      state_puts(state, uids->uid);
      state_puts(state, "\n");
 
      aka = true;
    }
  }
  else
  {
    if (sig->fpr)
    {
      state_puts(state, _("KeyID "));
      state_puts(state, sig->fpr);
    }
    else
    {
      /* L10N: You will see this message in place of "KeyID "
         if the S/MIME key has no ID. This is quite an error. */
      state_puts(state, _("no signature fingerprint available"));
    }
    state_puts(state, "\n");
  }
 
  /* timestamp is 0 when verification failed.
   * "Jan 1 1970" is not the created date. */
  if (sig->timestamp)
  {
    msgwid = mutt_strwidth(msg) - mutt_strwidth(_("created: ")) + 1;
    if (msgwid < 0)
      msgwid = 0;
    for (int i = 0; i < msgwid; i++)
      state_puts(state, " ");
    state_puts(state, _("created: "));
    print_time(sig->timestamp, state);
    state_puts(state, "\n");
  }
}

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show_one_recipient()

static void show_one_recipient ( struct State *  state, gpgme_recipient_t  r  )

static

Show information about one encryption recipient.

Parameters

state	State to write to
r	Encryption recipient

Definition at line 1417 of file crypt_gpgme.c.

{
  const char *algo = gpgme_pubkey_algo_name(r->pubkey_algo);
  if (!algo)
    algo = "?";
 
  // L10N: Show the algorithm and key ID of the encryption recipients, e.g
  //       Recipient: RSA key, ID 1111111111111111
  state_printf(state, _("Recipient: %s key, ID %s\n"), algo, r->keyid);
}

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show_encryption_info()

static void show_encryption_info ( struct State *  state, gpgme_decrypt_result_t  result  )

static

Show encryption information.

Parameters

state	State to write to
result	Decryption result

Definition at line 1433 of file crypt_gpgme.c.

{
  if (!cs_subset_bool(NeoMutt->sub, "crypt_encryption_info"))
    return;
 
  state_attach_puts(state, _("[-- Begin encryption information --]\n"));
 
  for (gpgme_recipient_t r = result->recipients; r; r = r->next)
    show_one_recipient(state, r);
 
  state_attach_puts(state, _("[-- End encryption information --]\n\n"));
}

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show_one_sig_status()

static int show_one_sig_status ( gpgme_ctx_t  ctx, int  idx, struct State *  state  )

static

Show information about one signature.

Parameters

ctx	GPGME handle of a successful verification
idx	Index
state	State to use

Return values

0	Normal procession
1	A bad signature
2	A signature with a warning
-1	No more signature

The index should start at 0 and increment for each call/signature.

Definition at line 1458 of file crypt_gpgme.c.

{
  const char *fpr = NULL;
  gpgme_key_t key = NULL;
  bool anybad = false, anywarn = false;
  gpgme_signature_t sig = NULL;
  gpgme_error_t err = GPG_ERR_NO_ERROR;
 
  gpgme_verify_result_t result = gpgme_op_verify_result(ctx);
  if (result)
  {
    /* FIXME: this code should use a static variable and remember
     * the current position in the list of signatures, IMHO.
     * -moritz.  */
    int i;
    for (i = 0, sig = result->signatures; sig && (i < idx); i++, sig = sig->next)
      ; // do nothing
 
    if (!sig)
      return -1; /* Signature not found.  */
 
    if (SignatureKey)
    {
      gpgme_key_unref(SignatureKey);
      SignatureKey = NULL;
    }
 
    fpr = sig->fpr;
    const unsigned int sum = sig->summary;
 
    if (gpg_err_code(sig->status) != GPG_ERR_NO_ERROR)
      anybad = true;
 
    if (gpg_err_code(sig->status) != GPG_ERR_NO_PUBKEY)
    {
      err = gpgme_get_key(ctx, fpr, &key, 0); /* secret key?  */
      if (err == GPG_ERR_NO_ERROR)
      {
        if (!SignatureKey)
          SignatureKey = key;
      }
      else
      {
        key = NULL; /* Old GPGME versions did not set KEY to NULL on
                         error.   Do it here to avoid a double free. */
      }
    }
    else
    {
      /* pubkey not present */
    }
 
    if (!state || !state->fp_out || !(state->flags & STATE_DISPLAY))
    {
      ; /* No state information so no way to print anything. */
    }
    else if (err != GPG_ERR_NO_ERROR)
    {
      char buf[1024] = { 0 };
      snprintf(buf, sizeof(buf), _("Error getting key information for KeyID %s: %s\n"),
               fpr, gpgme_strerror(err));
      state_puts(state, buf);
      anybad = true;
    }
    else if ((sum & GPGME_SIGSUM_GREEN))
    {
      print_smime_keyinfo(_("Good signature from:"), sig, key, state);
      if (show_sig_summary(sum, ctx, key, idx, state, sig))
        anywarn = true;
      show_one_sig_validity(ctx, idx, state);
    }
    else if ((sum & GPGME_SIGSUM_RED))
    {
      print_smime_keyinfo(_("*BAD* signature from:"), sig, key, state);
      show_sig_summary(sum, ctx, key, idx, state, sig);
    }
    else if (!anybad && key && (key->protocol == GPGME_PROTOCOL_OpenPGP))
    { /* We can't decide (yellow) but this is a PGP key with a good
           signature, so we display what a PGP user expects: The name,
           fingerprint and the key validity (which is neither fully or
           ultimate). */
      print_smime_keyinfo(_("Good signature from:"), sig, key, state);
      show_one_sig_validity(ctx, idx, state);
      show_fingerprint(key, state);
      if (show_sig_summary(sum, ctx, key, idx, state, sig))
        anywarn = true;
    }
    else /* can't decide (yellow) */
    {
      print_smime_keyinfo(_("Problem signature from:"), sig, key, state);
      /* 0 indicates no expiration */
      if (sig->exp_timestamp)
      {
        /* L10N: This is trying to match the width of the
           "Problem signature from:" translation just above. */
        state_puts(state, _("               expires: "));
        print_time(sig->exp_timestamp, state);
        state_puts(state, "\n");
      }
      show_sig_summary(sum, ctx, key, idx, state, sig);
      anywarn = true;
    }
 
    if (key != SignatureKey)
      gpgme_key_unref(key);
  }
 
  return anybad ? 1 : anywarn ? 2 : 0;
}

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verify_one()

static int verify_one ( struct Body *  b, struct State *  state, const char *  tempfile, bool  is_smime  )

static

Do the actual verification step.

Parameters

b	Body part containing signature
state	State to read from
tempfile	Temporary file to read
is_smime	Is the key S/MIME?

Return values

0	Success
1	Bad signature
2	Warnings
-1	Error

With is_smime set to true we assume S/MIME.

Definition at line 1581 of file crypt_gpgme.c.

{
  int badsig = -1;
  int anywarn = 0;
  gpgme_ctx_t ctx = NULL;
  gpgme_data_t message = NULL;
 
  gpgme_data_t signature = file_to_data_object(state->fp_in, b->offset, b->length);
  if (!signature)
    return -1;
 
  /* We need to tell GPGME about the encoding because the backend can't
   * auto-detect plain base-64 encoding which is used by S/MIME. */
  if (is_smime)
    gpgme_data_set_encoding(signature, GPGME_DATA_ENCODING_BASE64);
 
  gpgme_error_t err = gpgme_data_new_from_file(&message, tempfile, 1);
  if (err != GPG_ERR_NO_ERROR)
  {
    gpgme_data_release(signature);
    mutt_error(_("error allocating data object: %s"), gpgme_strerror(err));
    return -1;
  }
  ctx = create_gpgme_context(is_smime);
 
  /* Note: We don't need a current time output because GPGME avoids
   * such an attack by separating the meta information from the data. */
  state_attach_puts(state, _("[-- Begin signature information --]\n"));
 
  err = gpgme_op_verify(ctx, signature, message, NULL);
  gpgme_data_release(message);
  gpgme_data_release(signature);
 
  redraw_if_needed(ctx);
  if (err != GPG_ERR_NO_ERROR)
  {
    char buf[200] = { 0 };
 
    snprintf(buf, sizeof(buf) - 1, _("Error: verification failed: %s\n"),
             gpgme_strerror(err));
    state_puts(state, buf);
  }
  else
  { /* Verification succeeded, see what the result is. */
    gpgme_verify_result_t verify_result = NULL;
 
    if (SignatureKey)
    {
      gpgme_key_unref(SignatureKey);
      SignatureKey = NULL;
    }
 
    verify_result = gpgme_op_verify_result(ctx);
    if (verify_result && verify_result->signatures)
    {
      bool anybad = false;
      int res;
      for (int idx = 0; (res = show_one_sig_status(ctx, idx, state)) != -1; idx++)
      {
        if (res == 1)
          anybad = true;
        else if (res == 2)
          anywarn = 2;
      }
      if (!anybad)
        badsig = 0;
    }
  }
 
  if (badsig == 0)
  {
    gpgme_verify_result_t result = NULL;
    gpgme_sig_notation_t notation = NULL;
    gpgme_signature_t sig = NULL;
 
    result = gpgme_op_verify_result(ctx);
    if (result)
    {
      for (sig = result->signatures; sig; sig = sig->next)
      {
        int non_pka_notations = 0;
        for (notation = sig->notations; notation; notation = notation->next)
          if (!is_pka_notation(notation))
            non_pka_notations++;
 
        if (non_pka_notations)
        {
          char buf[128] = { 0 };
          snprintf(buf, sizeof(buf),
                   _("*** Begin Notation (signature by: %s) ***\n"), sig->fpr);
          state_puts(state, buf);
          for (notation = sig->notations; notation; notation = notation->next)
          {
            if (is_pka_notation(notation))
              continue;
 
            if (notation->name)
            {
              state_puts(state, notation->name);
              state_puts(state, "=");
            }
            if (notation->value)
            {
              state_puts(state, notation->value);
              if (!(*notation->value && (notation->value[strlen(notation->value) - 1] == '\n')))
                state_puts(state, "\n");
            }
          }
          state_puts(state, _("*** End Notation ***\n"));
        }
      }
    }
  }
 
  gpgme_release(ctx);
 
  state_attach_puts(state, _("[-- End signature information --]\n\n"));
  mutt_debug(LL_DEBUG1, "returning %d\n", badsig);
 
  return badsig ? 1 : anywarn ? 2 : 0;
}

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decrypt_part()

static struct Body * decrypt_part ( struct Body *  b, struct State *  state, FILE *  fp_out, bool  is_smime, int *  r_is_signed  )

static

Decrypt a PGP or SMIME message.

Parameters

[in]	b	Body of message
[in]	state	State to use
[in]	fp_out	File to write to
[in]	is_smime	True if an SMIME message
[out]	r_is_signed	Flag, R_IS_SIGNED (PGP only)

Return values

ptr	Newly allocated Body

For PGP returns a flag in R_IS_SIGNED to indicate whether this is a combined encrypted and signed message, for S/MIME it returns true when it is not a encrypted but a signed message.

Definition at line 1732 of file crypt_gpgme.c.

{
  if (!b || !state || !fp_out)
    return NULL;
 
  struct Body *tattach = NULL;
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  gpgme_data_t ciphertext = NULL, plaintext = NULL;
  gpgme_decrypt_result_t result = NULL;
  bool maybe_signed = false;
  bool anywarn = false;
  int sig_stat = 0;
 
  if (r_is_signed)
    *r_is_signed = 0;
 
  gpgme_ctx_t ctx = NULL;
restart:
  ctx = create_gpgme_context(is_smime);
 
  if (b->length < 0)
    return NULL;
  /* Make a data object from the body, create context etc. */
  ciphertext = file_to_data_object(state->fp_in, b->offset, b->length);
  if (!ciphertext)
    goto cleanup;
  plaintext = create_gpgme_data();
 
  /* Do the decryption or the verification in case of the S/MIME hack. */
  if ((!is_smime) || maybe_signed)
  {
    if (!is_smime)
      err = gpgme_op_decrypt_verify(ctx, ciphertext, plaintext);
    else if (maybe_signed)
      err = gpgme_op_verify(ctx, ciphertext, NULL, plaintext);
 
    if (err == GPG_ERR_NO_ERROR)
    {
      /* Check whether signatures have been verified.  */
      gpgme_verify_result_t verify_result = gpgme_op_verify_result(ctx);
      if (verify_result->signatures)
        sig_stat = 1;
    }
  }
  else
  {
    err = gpgme_op_decrypt(ctx, ciphertext, plaintext);
  }
  gpgme_data_release(ciphertext);
  ciphertext = NULL;
 
#ifdef USE_AUTOCRYPT
  // Abort right away and silently.  Autocrypt will retry on the normal keyring.
  if (OptAutocryptGpgme && (err != GPG_ERR_NO_ERROR))
    goto cleanup;
#endif
 
  const bool c_devel_security = cs_subset_bool(NeoMutt->sub, "devel_security");
 
  result = gpgme_op_decrypt_result(ctx);
  if (c_devel_security && result && (state->flags & STATE_DISPLAY))
    show_encryption_info(state, result);
 
  if (err != GPG_ERR_NO_ERROR)
  {
    if (is_smime && !maybe_signed && (gpg_err_code(err) == GPG_ERR_NO_DATA))
    {
      /* Check whether this might be a signed message despite what the mime
       * header told us.  Retry then.  gpgsm returns the error information
       * "unsupported Algorithm '?'" but GPGME will not store this unknown
       * algorithm, thus we test that it has not been set. */
      if (result && !result->unsupported_algorithm)
      {
        maybe_signed = true;
        gpgme_data_release(plaintext);
        plaintext = NULL;
        /* gpgsm ends the session after an error; restart it */
        gpgme_release(ctx);
        goto restart;
      }
    }
    redraw_if_needed(ctx);
    if ((state->flags & STATE_DISPLAY))
    {
      char buf[200] = { 0 };
 
      snprintf(buf, sizeof(buf) - 1,
               _("[-- Error: decryption failed: %s --]\n\n"), gpgme_strerror(err));
      state_attach_puts(state, buf);
    }
    goto cleanup;
  }
  redraw_if_needed(ctx);
 
  /* Read the output from GPGME, and make sure to change CRLF to LF,
   * otherwise read_mime_header has a hard time parsing the message.  */
  if (data_object_to_stream(plaintext, fp_out))
  {
    goto cleanup;
  }
  gpgme_data_release(plaintext);
  plaintext = NULL;
 
  if (sig_stat)
  {
    int res, idx;
    int anybad = 0;
 
    if (r_is_signed)
      *r_is_signed = -1; /* A signature exists. */
 
    if ((state->flags & STATE_DISPLAY))
    {
      state_attach_puts(state, _("[-- Begin signature information --]\n"));
    }
    for (idx = 0; (res = show_one_sig_status(ctx, idx, state)) != -1; idx++)
    {
      if (res == 1)
        anybad = 1;
      else if (res == 2)
        anywarn = true;
    }
    if (!anybad && idx && r_is_signed && *r_is_signed)
      *r_is_signed = anywarn ? 2 : 1; /* Good signature. */
 
    if ((state->flags & STATE_DISPLAY))
    {
      state_attach_puts(state, _("[-- End signature information --]\n\n"));
    }
  }
  gpgme_release(ctx);
  ctx = NULL;
 
  fflush(fp_out);
  rewind(fp_out);
  const long size = mutt_file_get_size_fp(fp_out);
  if (size == 0)
  {
    goto cleanup;
  }
  tattach = mutt_read_mime_header(fp_out, 0);
  if (tattach)
  {
    /* Need to set the length of this body part.  */
    tattach->length = size - tattach->offset;
 
    tattach->warnsig = anywarn;
 
    /* See if we need to recurse on this MIME part.  */
    mutt_parse_part(fp_out, tattach);
  }
 
cleanup:
  gpgme_data_release(ciphertext);
  gpgme_data_release(plaintext);
  gpgme_release(ctx);
 
  return tattach;
}

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pgp_gpgme_extract_keys()

static int pgp_gpgme_extract_keys ( gpgme_data_t  keydata, FILE **  fp  )

static

Write PGP keys to a file.

Parameters

[in]	keydata	GPGME key data
[out]	fp	Temporary file created with key info

Return values

0	Success
-1	Error

Definition at line 2113 of file crypt_gpgme.c.

{
  gpgme_ctx_t tmpctx = NULL;
  gpgme_key_t key = NULL;
  gpgme_user_id_t uid = NULL;
  gpgme_subkey_t subkey = NULL;
  const char *shortid = NULL;
  size_t len;
  char date[256] = { 0 };
  bool more;
  int rc = -1;
  time_t tt;
 
  *fp = mutt_file_mkstemp();
  if (!*fp)
  {
    mutt_perror(_("Can't create temporary file"));
    return -1;
  }
 
  tmpctx = create_gpgme_context(false);
 
  gpgme_error_t err = gpgme_op_keylist_from_data_start(tmpctx, keydata, 0);
  while (err == GPG_ERR_NO_ERROR)
  {
    err = gpgme_op_keylist_next(tmpctx, &key);
    if (err != GPG_ERR_NO_ERROR)
      break;
    uid = key->uids;
    subkey = key->subkeys;
    more = false;
    while (subkey)
    {
      shortid = subkey->keyid;
      len = mutt_str_len(subkey->keyid);
      if (len > 8)
        shortid += len - 8;
      tt = subkey->timestamp;
      mutt_date_localtime_format(date, sizeof(date), "%Y-%m-%d", tt);
 
      fprintf(*fp, "%s %5.5s %u/%8s %s\n", more ? "sub" : "pub",
              gpgme_pubkey_algo_name(subkey->pubkey_algo), subkey->length, shortid, date);
      if (!more)
      {
        while (uid)
        {
          fprintf(*fp, "uid %s\n", NONULL(uid->uid));
          uid = uid->next;
        }
      }
      subkey = subkey->next;
      more = true;
    }
    gpgme_key_unref(key);
  }
  if (gpg_err_code(err) != GPG_ERR_EOF)
  {
    mutt_debug(LL_DEBUG1, "Error listing keys\n");
    goto err_fp;
  }
 
  rc = 0;
 
err_fp:
  if (rc)
    mutt_file_fclose(fp);
 
  gpgme_release(tmpctx);
 
  return rc;
}

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line_compare()

static int line_compare ( const char *  a, size_t  n, const char *  b  )

static

Compare two strings ignore line endings.

Parameters

a	String a
n	Maximum length to compare
b	String b

Return values

0	Strings match
-1	Strings differ

Check that b is a complete line containing a followed by either LF or CRLF.

Definition at line 2196 of file crypt_gpgme.c.

{
  if (mutt_strn_equal(a, b, n))
  {
    /* at this point we know that 'b' is at least 'n' chars long */
    if ((b[n] == '\n') || ((b[n] == '\r') && (b[n + 1] == '\n')))
      return true;
  }
  return false;
}

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pgp_check_traditional_one_body()

static int pgp_check_traditional_one_body ( FILE *  fp, struct Body *  b  )

static

Check one inline PGP body part.

Parameters

fp	File to read from
b	Body of the email

Return values

true	Success
false	Error

Definition at line 2214 of file crypt_gpgme.c.

{
  char buf[8192] = { 0 };
  bool rc = false;
 
  bool sgn = false;
  bool enc = false;
 
  if (b->type != TYPE_TEXT)
    return 0;
 
  struct Buffer *tempfile = buf_pool_get();
  buf_mktemp(tempfile);
  if (mutt_decode_save_attachment(fp, b, buf_string(tempfile), STATE_NO_FLAGS,
                                  MUTT_SAVE_NO_FLAGS) != 0)
  {
    unlink(buf_string(tempfile));
    goto cleanup;
  }
 
  FILE *fp_tmp = mutt_file_fopen(buf_string(tempfile), "r");
  if (!fp_tmp)
  {
    unlink(buf_string(tempfile));
    goto cleanup;
  }
 
  while (fgets(buf, sizeof(buf), fp_tmp))
  {
    size_t plen = mutt_str_startswith(buf, "-----BEGIN PGP ");
    if (plen != 0)
    {
      if (MESSAGE(buf + plen))
      {
        enc = true;
        break;
      }
      else if (SIGNED_MESSAGE(buf + plen))
      {
        sgn = true;
        break;
      }
    }
  }
  mutt_file_fclose(&fp_tmp);
  unlink(buf_string(tempfile));
 
  if (!enc && !sgn)
    goto cleanup;
 
  /* fix the content type */
 
  mutt_param_set(&b->parameter, "format", "fixed");
  mutt_param_set(&b->parameter, "x-action", enc ? "pgp-encrypted" : "pgp-signed");
 
  rc = true;
 
cleanup:
  buf_pool_release(&tempfile);
  return rc;
}

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copy_clearsigned()

static void copy_clearsigned ( gpgme_data_t  data, struct State *  state, char *  charset  )

static

Copy a clearsigned message.

Parameters

data	GPGME data object
state	State to use
charset	Charset of message

strip the signature and PGP's dash-escaping.

XXX charset handling: We assume that it is safe to do character set decoding first, dash decoding second here, while we do it the other way around in the main handler.

(Note that we aren't worse than Outlook & Cie in this, and also note that we can successfully handle anything produced by any existing versions of neomutt.)

Definition at line 2415 of file crypt_gpgme.c.

{
  char buf[8192] = { 0 };
  bool complete, armor_header;
  FILE *fp = NULL;
 
  char *fname = data_object_to_tempfile(data, &fp);
  if (!fname)
  {
    mutt_file_fclose(&fp);
    return;
  }
  unlink(fname);
  FREE(&fname);
 
  /* fromcode comes from the MIME Content-Type charset label. It might
   * be a wrong label, so we want the ability to do corrections via
   * charset-hooks. Therefore we set flags to MUTT_ICONV_HOOK_FROM.  */
  struct FgetConv *fc = mutt_ch_fgetconv_open(fp, charset, cc_charset(), MUTT_ICONV_HOOK_FROM);
 
  for (complete = true, armor_header = true;
       mutt_ch_fgetconvs(buf, sizeof(buf), fc); complete = (strchr(buf, '\n')))
  {
    if (!complete)
    {
      if (!armor_header)
        state_puts(state, buf);
      continue;
    }
 
    if (BEGIN_PGP_SIGNATURE(buf))
      break;
 
    if (armor_header)
    {
      if (buf[0] == '\n')
        armor_header = false;
      continue;
    }
 
    if (state->prefix)
      state_puts(state, state->prefix);
 
    if ((buf[0] == '-') && (buf[1] == ' '))
      state_puts(state, buf + 2);
    else
      state_puts(state, buf);
  }
 
  mutt_ch_fgetconv_close(&fc);
  mutt_file_fclose(&fp);
}

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key_check_cap()

unsigned int key_check_cap	(	gpgme_key_t	key,
		enum KeyCap	cap
	)

Check the capabilities of a key.

Parameters

key	GPGME key
cap	Flags, e.g. KEY_CAP_CAN_ENCRYPT

Return values

>0	Key has the capabilities

Definition at line 2949 of file crypt_gpgme.c.

{
  unsigned int rc = 0;
 
  switch (cap)
  {
    case KEY_CAP_CAN_ENCRYPT:
      rc = key->can_encrypt;
      if (rc == 0)
      {
        for (gpgme_subkey_t subkey = key->subkeys; subkey; subkey = subkey->next)
        {
          rc = subkey->can_encrypt;
          if (rc != 0)
            break;
        }
      }
      break;
    case KEY_CAP_CAN_SIGN:
      rc = key->can_sign;
      if (rc == 0)
      {
        for (gpgme_subkey_t subkey = key->subkeys; subkey; subkey = subkey->next)
        {
          rc = subkey->can_sign;
          if (rc != 0)
            break;
        }
      }
      break;
    case KEY_CAP_CAN_CERTIFY:
      rc = key->can_certify;
      if (rc == 0)
      {
        for (gpgme_subkey_t subkey = key->subkeys; subkey; subkey = subkey->next)
        {
          rc = subkey->can_certify;
          if (rc != 0)
            break;
        }
      }
      break;
  }
 
  return rc;
}

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list_to_pattern()

static char * list_to_pattern ( struct ListHead *  list )

static

Convert STailQ to GPGME-compatible pattern.

Parameters

list	List of strings to convert

Return values

ptr	GPGME-compatible pattern

We need to convert spaces in an item into a '+' and '' into "%25".

Note

The caller must free the returned pattern

Definition at line 3005 of file crypt_gpgme.c.

{
  char *pattern = NULL, *p = NULL;
  const char *s = NULL;
  size_t n;
 
  n = 0;
  struct ListNode *np = NULL;
  STAILQ_FOREACH(np, list, entries)
  {
    for (s = np->data; *s; s++)
    {
      if ((*s == '%') || (*s == '+'))
        n += 2;
      n++;
    }
    n++; /* delimiter or end of string */
  }
  n++; /* make sure to allocate at least one byte */
  p = MUTT_MEM_CALLOC(n, char);
  pattern = p;
  STAILQ_FOREACH(np, list, entries)
  {
    s = np->data;
    if (*s)
    {
      if (np != STAILQ_FIRST(list))
        *p++ = ' ';
      for (s = np->data; *s; s++)
      {
        if (*s == '%')
        {
          *p++ = '%';
          *p++ = '2';
          *p++ = '5';
        }
        else if (*s == '+')
        {
          *p++ = '%';
          *p++ = '2';
          *p++ = 'B';
        }
        else if (*s == ' ')
        {
          *p++ = '+';
        }
        else
        {
          *p++ = *s;
        }
      }
    }
  }
  *p = '\0';
  return pattern;
}

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get_candidates()

static struct CryptKeyInfo * get_candidates ( struct ListHead *  hints, SecurityFlags  app, int  secret  )

static

Get a list of keys which are candidates for the selection.

Parameters

hints	List of strings to match
app	Application type, e.g. APPLICATION_PGP
secret	If true, only match secret keys

Return values

ptr	Key List
NULL	Error

Select by looking at the HINTS list.

Definition at line 3072 of file crypt_gpgme.c.

{
  struct CryptKeyInfo *db = NULL, *k = NULL, **kend = NULL;
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  gpgme_ctx_t ctx = NULL;
  gpgme_key_t key = NULL;
  int idx;
  gpgme_user_id_t uid = NULL;
 
  char *pattern = list_to_pattern(hints);
  if (!pattern)
    return NULL;
 
  ctx = create_gpgme_context(0);
  db = NULL;
  kend = &db;
 
  if ((app & APPLICATION_PGP))
  {
    /* It's all a mess.  That old GPGME expects different things depending on
     * the protocol.  For gpg we don't need percent escaped pappert but simple
     * strings passed in an array to the keylist_ext_start function. */
    size_t n = 0;
    struct ListNode *np = NULL;
    STAILQ_FOREACH(np, hints, entries)
    {
      if (np->data && *np->data)
        n++;
    }
    if (n == 0)
      goto no_pgphints;
 
    char **patarr = MUTT_MEM_CALLOC(n + 1, char *);
    n = 0;
    STAILQ_FOREACH(np, hints, entries)
    {
      if (np->data && *np->data)
        patarr[n++] = mutt_str_dup(np->data);
    }
    patarr[n] = NULL;
    err = gpgme_op_keylist_ext_start(ctx, (const char **) patarr, secret, 0);
    for (n = 0; patarr[n]; n++)
      FREE(&patarr[n]);
    FREE(&patarr);
    if (err != GPG_ERR_NO_ERROR)
    {
      mutt_error(_("gpgme_op_keylist_start failed: %s"), gpgme_strerror(err));
      gpgme_release(ctx);
      FREE(&pattern);
      return NULL;
    }
 
    while ((err = gpgme_op_keylist_next(ctx, &key)) == GPG_ERR_NO_ERROR)
    {
      KeyFlags flags = KEYFLAG_NO_FLAGS;
 
      if (key_check_cap(key, KEY_CAP_CAN_ENCRYPT))
        flags |= KEYFLAG_CANENCRYPT;
      if (key_check_cap(key, KEY_CAP_CAN_SIGN))
        flags |= KEYFLAG_CANSIGN;
 
      if (key->revoked)
        flags |= KEYFLAG_REVOKED;
      if (key->expired)
        flags |= KEYFLAG_EXPIRED;
      if (key->disabled)
        flags |= KEYFLAG_DISABLED;
 
      for (idx = 0, uid = key->uids; uid; idx++, uid = uid->next)
      {
        k = MUTT_MEM_CALLOC(1, struct CryptKeyInfo);
        k->kobj = key;
        gpgme_key_ref(k->kobj);
        k->idx = idx;
        k->uid = uid->uid;
        k->flags = flags;
        if (uid->revoked)
          k->flags |= KEYFLAG_REVOKED;
        k->validity = uid->validity;
        *kend = k;
        kend = &k->next;
      }
      gpgme_key_unref(key);
    }
    if (gpg_err_code(err) != GPG_ERR_EOF)
      mutt_error(_("gpgme_op_keylist_next failed: %s"), gpgme_strerror(err));
    gpgme_op_keylist_end(ctx);
  no_pgphints:;
  }
 
  if ((app & APPLICATION_SMIME))
  {
    /* and now look for x509 certificates */
    gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
    err = gpgme_op_keylist_start(ctx, pattern, 0);
    if (err != GPG_ERR_NO_ERROR)
    {
      mutt_error(_("gpgme_op_keylist_start failed: %s"), gpgme_strerror(err));
      gpgme_release(ctx);
      FREE(&pattern);
      return NULL;
    }
 
    while ((err = gpgme_op_keylist_next(ctx, &key)) == GPG_ERR_NO_ERROR)
    {
      KeyFlags flags = KEYFLAG_ISX509;
 
      if (key_check_cap(key, KEY_CAP_CAN_ENCRYPT))
        flags |= KEYFLAG_CANENCRYPT;
      if (key_check_cap(key, KEY_CAP_CAN_SIGN))
        flags |= KEYFLAG_CANSIGN;
 
      if (key->revoked)
        flags |= KEYFLAG_REVOKED;
      if (key->expired)
        flags |= KEYFLAG_EXPIRED;
      if (key->disabled)
        flags |= KEYFLAG_DISABLED;
 
      for (idx = 0, uid = key->uids; uid; idx++, uid = uid->next)
      {
        k = MUTT_MEM_CALLOC(1, struct CryptKeyInfo);
        k->kobj = key;
        gpgme_key_ref(k->kobj);
        k->idx = idx;
        k->uid = uid->uid;
        k->flags = flags;
        if (uid->revoked)
          k->flags |= KEYFLAG_REVOKED;
        k->validity = uid->validity;
        *kend = k;
        kend = &k->next;
      }
      gpgme_key_unref(key);
    }
    if (gpg_err_code(err) != GPG_ERR_EOF)
      mutt_error(_("gpgme_op_keylist_next failed: %s"), gpgme_strerror(err));
    gpgme_op_keylist_end(ctx);
  }
 
  gpgme_release(ctx);
  FREE(&pattern);
  return db;
}

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crypt_add_string_to_hints()

static void crypt_add_string_to_hints ( const char *  str, struct ListHead *  hints  )

static

Split a string and add the parts to a List.

Parameters

[in]	str	String to parse
[out]	hints	List of string parts

The string str is split by whitespace and punctuation and the parts added to hints. This list is later used to match addresses.

Definition at line 3225 of file crypt_gpgme.c.

{
  char *scratch = mutt_str_dup(str);
  if (!scratch)
    return;
 
  for (char *t = strtok(scratch, " ,.:\"()<>\n"); t; t = strtok(NULL, " ,.:\"()<>\n"))
  {
    if (strlen(t) > 3)
      mutt_list_insert_tail(hints, mutt_str_dup(t));
  }
 
  FREE(&scratch);
}

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crypt_getkeybyaddr()

static struct CryptKeyInfo * crypt_getkeybyaddr ( struct Address *  a, KeyFlags  abilities, unsigned int  app, bool *  forced_valid, bool  oppenc_mode  )

static

Find a key by email address.

Parameters

[in]	a	Address to match
[in]	abilities	Abilities to match, see KeyFlags
[in]	app	Application type, e.g. APPLICATION_PGP
[out]	forced_valid	Set to true if user overrode key's validity
[in]	oppenc_mode	If true, use opportunistic encryption

Return values

ptr	Matching key

Definition at line 3249 of file crypt_gpgme.c.

{
  struct ListHead hints = STAILQ_HEAD_INITIALIZER(hints);
 
  int multi = false;
  int this_key_has_strong = false;
  int this_key_has_addr_match = false;
  int match = false;
 
  struct CryptKeyInfo *keys = NULL, *k = NULL;
  struct CryptKeyInfo *the_strong_valid_key = NULL;
  struct CryptKeyInfo *a_valid_addrmatch_key = NULL;
  struct CryptKeyInfo *matches = NULL;
  struct CryptKeyInfo **matches_endp = &matches;
 
  if (a && a->mailbox)
    mutt_list_insert_tail(&hints, buf_strdup(a->mailbox));
  if (a && a->personal)
    crypt_add_string_to_hints(buf_string(a->personal), &hints);
 
  if (!oppenc_mode)
    mutt_message(_("Looking for keys matching \"%s\"..."), a ? buf_string(a->mailbox) : "");
  keys = get_candidates(&hints, app, (abilities & KEYFLAG_CANSIGN));
 
  mutt_list_free(&hints);
 
  if (!keys)
    return NULL;
 
  mutt_debug(LL_DEBUG5, "looking for %s <%s>\n",
             a ? buf_string(a->personal) : "", a ? buf_string(a->mailbox) : "");
 
  for (k = keys; k; k = k->next)
  {
    mutt_debug(LL_DEBUG5, "  looking at key: %s '%.15s'\n", crypt_keyid(k), k->uid);
 
    if (abilities && !(k->flags & abilities))
    {
      mutt_debug(LL_DEBUG2, "  insufficient abilities: Has %x, want %x\n", k->flags, abilities);
      continue;
    }
 
    this_key_has_strong = false; /* strong and valid match */
    this_key_has_addr_match = false;
    match = false; /* any match */
 
    struct AddressList alist = TAILQ_HEAD_INITIALIZER(alist);
    mutt_addrlist_parse(&alist, k->uid);
    struct Address *ka = NULL;
    TAILQ_FOREACH(ka, &alist, entries)
    {
      int validity = crypt_id_matches_addr(a, ka, k);
 
      if (validity & CRYPT_KV_MATCH) /* something matches */
      {
        match = true;
 
        if ((validity & CRYPT_KV_VALID) && (validity & CRYPT_KV_ADDR))
        {
          if (validity & CRYPT_KV_STRONGID)
          {
            if (the_strong_valid_key && (the_strong_valid_key->kobj != k->kobj))
              multi = true;
            this_key_has_strong = true;
          }
          else
          {
            this_key_has_addr_match = true;
          }
        }
      }
    }
    mutt_addrlist_clear(&alist);
 
    if (match)
    {
      struct CryptKeyInfo *tmp = crypt_copy_key(k);
      *matches_endp = tmp;
      matches_endp = &tmp->next;
 
      if (this_key_has_strong)
        the_strong_valid_key = tmp;
      else if (this_key_has_addr_match)
        a_valid_addrmatch_key = tmp;
    }
  }
 
  crypt_key_free(&keys);
 
  if (matches)
  {
    if (oppenc_mode || !isatty(STDIN_FILENO))
    {
      const bool c_crypt_opportunistic_encrypt_strong_keys =
          cs_subset_bool(NeoMutt->sub, "crypt_opportunistic_encrypt_strong_keys");
      if (the_strong_valid_key)
        k = crypt_copy_key(the_strong_valid_key);
      else if (a_valid_addrmatch_key && !c_crypt_opportunistic_encrypt_strong_keys)
        k = crypt_copy_key(a_valid_addrmatch_key);
      else
        k = NULL;
    }
    else if (the_strong_valid_key && !multi)
    {
      /* There was precisely one strong match on a valid ID.
       * Proceed without asking the user.  */
      k = crypt_copy_key(the_strong_valid_key);
    }
    else
    {
      /* Else: Ask the user.  */
      k = dlg_gpgme(matches, a, NULL, app, forced_valid);
    }
 
    crypt_key_free(&matches);
  }
  else
  {
    k = NULL;
  }
 
  return k;
}

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crypt_getkeybystr()

static struct CryptKeyInfo * crypt_getkeybystr ( const char *  p, KeyFlags  abilities, unsigned int  app, bool *  forced_valid  )

static

Find a key by string.

Parameters

[in]	p	String to match
[in]	abilities	Abilities to match, see KeyFlags
[in]	app	Application type, e.g. APPLICATION_PGP
[out]	forced_valid	Set to true if user overrode key's validity

Return values

ptr	Matching key

Definition at line 3383 of file crypt_gpgme.c.

{
  struct ListHead hints = STAILQ_HEAD_INITIALIZER(hints);
  struct CryptKeyInfo *matches = NULL;
  struct CryptKeyInfo **matches_endp = &matches;
  struct CryptKeyInfo *k = NULL;
  const char *ps = NULL, *pl = NULL, *phint = NULL;
 
  mutt_message(_("Looking for keys matching \"%s\"..."), p);
 
  const char *pfcopy = crypt_get_fingerprint_or_id(p, &phint, &pl, &ps);
  crypt_add_string_to_hints(phint, &hints);
  struct CryptKeyInfo *keys = get_candidates(&hints, app, (abilities & KEYFLAG_CANSIGN));
  mutt_list_free(&hints);
 
  if (!keys)
  {
    FREE(&pfcopy);
    return NULL;
  }
 
  for (k = keys; k; k = k->next)
  {
    if (abilities && !(k->flags & abilities))
      continue;
 
    mutt_debug(LL_DEBUG5, "matching \"%s\" against key %s, \"%s\": ", p,
               crypt_long_keyid(k), k->uid);
 
    if ((*p == '\0') || (pfcopy && mutt_istr_equal(pfcopy, crypt_fpr(k))) ||
        (pl && mutt_istr_equal(pl, crypt_long_keyid(k))) ||
        (ps && mutt_istr_equal(ps, crypt_short_keyid(k))) || mutt_istr_find(k->uid, p))
    {
      mutt_debug(LL_DEBUG5, "match\n");
 
      struct CryptKeyInfo *tmp = crypt_copy_key(k);
      *matches_endp = tmp;
      matches_endp = &tmp->next;
    }
    else
    {
      mutt_debug(LL_DEBUG5, "no match\n");
    }
  }
 
  FREE(&pfcopy);
  crypt_key_free(&keys);
 
  if (matches)
  {
    if (isatty(STDIN_FILENO))
    {
      k = dlg_gpgme(matches, NULL, p, app, forced_valid);
 
      crypt_key_free(&matches);
      return k;
    }
    else
    {
      if (crypt_keys_are_valid(matches))
        return matches;
 
      crypt_key_free(&matches);
      return NULL;
    }
  }
 
  return NULL;
}

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crypt_ask_for_key()

static struct CryptKeyInfo * crypt_ask_for_key ( const char *  tag, const char *  whatfor, KeyFlags  abilities, unsigned int  app, bool *  forced_valid  )

static

Ask the user for a key.

Parameters

[in]	tag	Prompt to display
[in]	whatfor	Label to use (OPTIONAL)
[in]	abilities	Flags, see KeyFlags
[in]	app	Application type, e.g. APPLICATION_PGP
[out]	forced_valid	Set to true if user overrode key's validity

Return values

ptr	Copy of the selected key

If whatfor is not null use it as default and store it under that label as the next default.

Definition at line 3466 of file crypt_gpgme.c.

{
  struct CryptKeyInfo *key = NULL;
  struct CryptCache *l = NULL;
  struct Buffer *resp = buf_pool_get();
 
  mutt_clear_error();
 
  if (whatfor)
  {
    for (l = IdDefaults; l; l = l->next)
    {
      if (mutt_istr_equal(whatfor, l->what))
      {
        buf_strcpy(resp, l->dflt);
        break;
      }
    }
  }
 
  while (true)
  {
    buf_reset(resp);
    if (mw_get_field(tag, resp, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0)
    {
      goto done;
    }
 
    if (whatfor)
    {
      if (l)
      {
        mutt_str_replace(&l->dflt, buf_string(resp));
      }
      else
      {
        l = MUTT_MEM_MALLOC(1, struct CryptCache);
        l->next = IdDefaults;
        IdDefaults = l;
        l->what = mutt_str_dup(whatfor);
        l->dflt = buf_strdup(resp);
      }
    }
 
    key = crypt_getkeybystr(buf_string(resp), abilities, app, forced_valid);
    if (key)
      goto done;
 
    mutt_error(_("No matching keys found for \"%s\""), buf_string(resp));
  }
 
done:
  buf_pool_release(&resp);
  return key;
}

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find_keys()

static char * find_keys ( const struct AddressList *  addrlist, unsigned int  app, bool  oppenc_mode  )

static

Find keys of the recipients of the message.

Parameters

addrlist	Address List
app	Application type, e.g. APPLICATION_PGP
oppenc_mode	If true, use opportunistic encryption

Return values

ptr	Space-separated string of keys
NULL	At least one of the keys can't be found

If oppenc_mode is true, only keys that can be determined without prompting will be used.

Definition at line 3535 of file crypt_gpgme.c.

{
  struct ListHead crypt_hook_list = STAILQ_HEAD_INITIALIZER(crypt_hook_list);
  struct ListNode *crypt_hook = NULL;
  const char *keyid = NULL;
  char *keylist = NULL;
  size_t keylist_size = 0;
  size_t keylist_used = 0;
  struct Address *p = NULL;
  struct CryptKeyInfo *k_info = NULL;
  const char *fqdn = mutt_fqdn(true, NeoMutt->sub);
  char buf[1024] = { 0 };
  bool forced_valid = false;
  bool key_selected;
  struct AddressList hookal = TAILQ_HEAD_INITIALIZER(hookal);
 
  struct Address *a = NULL;
  const bool c_crypt_confirm_hook = cs_subset_bool(NeoMutt->sub, "crypt_confirm_hook");
  TAILQ_FOREACH(a, addrlist, entries)
  {
    key_selected = false;
    mutt_crypt_hook(&crypt_hook_list, a);
    crypt_hook = STAILQ_FIRST(&crypt_hook_list);
    do
    {
      p = a;
      forced_valid = false;
      k_info = NULL;
 
      if (crypt_hook)
      {
        keyid = crypt_hook->data;
        enum QuadOption ans = MUTT_YES;
        if (!oppenc_mode && c_crypt_confirm_hook && isatty(STDIN_FILENO))
        {
          snprintf(buf, sizeof(buf), _("Use keyID = \"%s\" for %s?"), keyid,
                   buf_string(p->mailbox));
          ans = query_yesorno_help(buf, MUTT_YES, NeoMutt->sub, "crypt_confirm_hook");
        }
        if (ans == MUTT_YES)
        {
          if (crypt_is_numerical_keyid(keyid))
          {
            if (mutt_strn_equal(keyid, "0x", 2))
              keyid += 2;
            goto bypass_selection; /* you don't see this. */
          }
 
          /* check for e-mail address */
          mutt_addrlist_clear(&hookal);
          if (strchr(keyid, '@') && (mutt_addrlist_parse(&hookal, keyid) != 0))
          {
            mutt_addrlist_qualify(&hookal, fqdn);
            p = TAILQ_FIRST(&hookal);
          }
          else if (!oppenc_mode)
          {
            k_info = crypt_getkeybystr(keyid, KEYFLAG_CANENCRYPT, app, &forced_valid);
          }
        }
        else if (ans == MUTT_NO)
        {
          if (key_selected || STAILQ_NEXT(crypt_hook, entries))
          {
            crypt_hook = STAILQ_NEXT(crypt_hook, entries);
            continue;
          }
        }
        else if (ans == MUTT_ABORT)
        {
          FREE(&keylist);
          mutt_addrlist_clear(&hookal);
          mutt_list_free(&crypt_hook_list);
          return NULL;
        }
      }
 
      if (!k_info)
      {
        k_info = crypt_getkeybyaddr(p, KEYFLAG_CANENCRYPT, app, &forced_valid, oppenc_mode);
      }
 
      if (!k_info && !oppenc_mode && isatty(STDIN_FILENO))
      {
        snprintf(buf, sizeof(buf), _("Enter keyID for %s: "), buf_string(p->mailbox));
 
        k_info = crypt_ask_for_key(buf, buf_string(p->mailbox),
                                   KEYFLAG_CANENCRYPT, app, &forced_valid);
      }
 
      if (!k_info)
      {
        FREE(&keylist);
        mutt_addrlist_clear(&hookal);
        mutt_list_free(&crypt_hook_list);
        return NULL;
      }
 
      keyid = crypt_fpr_or_lkeyid(k_info);
 
    bypass_selection:
      keylist_size += mutt_str_len(keyid) + 4 + 1;
      MUTT_MEM_REALLOC(&keylist, keylist_size, char);
      sprintf(keylist + keylist_used, "%s0x%s%s", keylist_used ? " " : "",
              keyid, forced_valid ? "!" : "");
      keylist_used = mutt_str_len(keylist);
 
      key_selected = true;
 
      crypt_key_free(&k_info);
      mutt_addrlist_clear(&hookal);
 
      if (crypt_hook)
        crypt_hook = STAILQ_NEXT(crypt_hook, entries);
 
    } while (crypt_hook);
 
    mutt_list_free(&crypt_hook_list);
  }
  return keylist;
}

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mutt_gpgme_select_secret_key()

int mutt_gpgme_select_secret_key

(

struct Buffer *

keyid

)

Select a private Autocrypt key for a new account.

Parameters

keyid

Autocrypt Key id

Return values

0	Success
-1	Error

Unfortunately, the internal ncrypt/crypt_gpgme.c functions use CryptKeyInfo, and so aren't exportable.

This function queries all private keys, provides the crypt_select_keys() menu, and returns the selected key fingerprint in keyid.

Definition at line 3686 of file crypt_gpgme.c.

{
  int rc = -1;
  gpgme_error_t err = GPG_ERR_NO_ERROR;
  gpgme_key_t key = NULL;
  gpgme_user_id_t uid = NULL;
  struct CryptKeyInfo *results = NULL, *k = NULL;
  struct CryptKeyInfo **kend = NULL;
  struct CryptKeyInfo *choice = NULL;
 
  gpgme_ctx_t ctx = create_gpgme_context(false);
 
  /* list all secret keys */
  if (gpgme_op_keylist_start(ctx, NULL, 1))
    goto cleanup;
 
  kend = &results;
 
  while ((err = gpgme_op_keylist_next(ctx, &key)) == GPG_ERR_NO_ERROR)
  {
    KeyFlags flags = KEYFLAG_NO_FLAGS;
 
    if (key_check_cap(key, KEY_CAP_CAN_ENCRYPT))
      flags |= KEYFLAG_CANENCRYPT;
    if (key_check_cap(key, KEY_CAP_CAN_SIGN))
      flags |= KEYFLAG_CANSIGN;
 
    if (key->revoked)
      flags |= KEYFLAG_REVOKED;
    if (key->expired)
      flags |= KEYFLAG_EXPIRED;
    if (key->disabled)
      flags |= KEYFLAG_DISABLED;
 
    int idx;
    for (idx = 0, uid = key->uids; uid; idx++, uid = uid->next)
    {
      k = MUTT_MEM_CALLOC(1, struct CryptKeyInfo);
      k->kobj = key;
      gpgme_key_ref(k->kobj);
      k->idx = idx;
      k->uid = uid->uid;
      k->flags = flags;
      if (uid->revoked)
        k->flags |= KEYFLAG_REVOKED;
      k->validity = uid->validity;
      *kend = k;
      kend = &k->next;
    }
    gpgme_key_unref(key);
  }
  if (gpg_err_code(err) != GPG_ERR_EOF)
    mutt_error(_("gpgme_op_keylist_next failed: %s"), gpgme_strerror(err));
  gpgme_op_keylist_end(ctx);
 
  if (!results)
  {
    /* L10N: mutt_gpgme_select_secret_key() tries to list all secret keys to choose
       from.  This error is displayed if no results were found.  */
    mutt_error(_("No secret keys found"));
    goto cleanup;
  }
 
  choice = dlg_gpgme(results, NULL, "*", APPLICATION_PGP, NULL);
  if (!(choice && choice->kobj && choice->kobj->subkeys && choice->kobj->subkeys->fpr))
    goto cleanup;
  buf_strcpy(keyid, choice->kobj->subkeys->fpr);
 
  rc = 0;
 
cleanup:
  crypt_key_free(&choice);
  crypt_key_free(&results);
  gpgme_release(ctx);
  return rc;
}

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init_common()

static void init_common ( void  )

static

Initialise code common to PGP and SMIME parts of GPGME.

Definition at line 3825 of file crypt_gpgme.c.

{
  /* this initialization should only run one time, but it may be called by
   * either pgp_gpgme_init or smime_gpgme_init */
  static bool has_run = false;
  if (has_run)
    return;
 
  gpgme_check_version(NULL);
  gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
#ifdef ENABLE_NLS
  gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
#endif
  has_run = true;
}

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init_pgp()

static void init_pgp ( void  )

static

Initialise the PGP crypto backend.

Definition at line 3844 of file crypt_gpgme.c.

{
  if (gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP) != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("GPGME: OpenPGP protocol not available"));
  }
}

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init_smime()

static void init_smime ( void  )

static

Initialise the SMIME crypto backend.

Definition at line 3855 of file crypt_gpgme.c.

{
  if (gpgme_engine_check_version(GPGME_PROTOCOL_CMS) != GPG_ERR_NO_ERROR)
  {
    mutt_error(_("GPGME: CMS protocol not available"));
  }
}

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gpgme_send_menu()

static SecurityFlags gpgme_send_menu ( struct Email *  e, bool  is_smime  )

static

Show the user the encryption/signing menu.

Parameters

e	Email
is_smime	True if an SMIME message

Return values

num	Flags, e.g. APPLICATION_SMIME | SEC_ENCRYPT

Definition at line 3887 of file crypt_gpgme.c.

{
  struct CryptKeyInfo *p = NULL;
  const char *prompt = NULL;
  const char *letters = NULL;
  const char *choices = NULL;
  int choice;
 
  if (is_smime)
    e->security |= APPLICATION_SMIME;
  else
    e->security |= APPLICATION_PGP;
 
  /* Opportunistic encrypt is controlling encryption.
   * NOTE: "Signing" and "Clearing" only adjust the sign bit, so we have different
   *       letter choices for those.
   */
  const bool c_crypt_opportunistic_encrypt = cs_subset_bool(NeoMutt->sub, "crypt_opportunistic_encrypt");
  if (c_crypt_opportunistic_encrypt && (e->security & SEC_OPPENCRYPT))
  {
    if (is_smime)
    {
      /* L10N: S/MIME options (opportunistic encryption is on) */
      prompt = _("S/MIME (s)ign, sign (a)s, (p)gp, (c)lear, or (o)ppenc mode off?");
      /* L10N: S/MIME options (opportunistic encryption is on) */
      letters = _("sapco");
      choices = "SapCo";
    }
    else
    {
      /* L10N: PGP options (opportunistic encryption is on) */
      prompt = _("PGP (s)ign, sign (a)s, s/(m)ime, (c)lear, or (o)ppenc mode off?");
      /* L10N: PGP options (opportunistic encryption is on) */
      letters = _("samco");
      choices = "SamCo";
    }
  }
  else if (c_crypt_opportunistic_encrypt)
  {
    /* Opportunistic encryption option is set, but is toggled off for this message.  */
    if (is_smime)
    {
      /* L10N: S/MIME options (opportunistic encryption is off) */
      prompt = _("S/MIME (e)ncrypt, (s)ign, sign (a)s, (b)oth, (p)gp, (c)lear, or (o)ppenc mode?");
      /* L10N: S/MIME options (opportunistic encryption is off) */
      letters = _("esabpco");
      choices = "esabpcO";
    }
    else
    {
      /* L10N: PGP options (opportunistic encryption is off) */
      prompt = _("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, s/(m)ime, (c)lear, or (o)ppenc mode?");
      /* L10N: PGP options (opportunistic encryption is off) */
      letters = _("esabmco");
      choices = "esabmcO";
    }
  }
  else
  {
    /* Opportunistic encryption is unset */
    if (is_smime)
    {
      /* L10N: S/MIME options */
      prompt = _("S/MIME (e)ncrypt, (s)ign, sign (a)s, (b)oth, (p)gp or (c)lear?");
      /* L10N: S/MIME options */
      letters = _("esabpc");
      choices = "esabpc";
    }
    else
    {
      /* L10N: PGP options */
      prompt = _("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, s/(m)ime or (c)lear?");
      /* L10N: PGP options */
      letters = _("esabmc");
      choices = "esabmc";
    }
  }
 
  choice = mw_multi_choice(prompt, letters);
  if (choice > 0)
  {
    switch (choices[choice - 1])
    {
      case 'a': /* sign (a)s */
        p = crypt_ask_for_key(_("Sign as: "), NULL, KEYFLAG_CANSIGN,
                              is_smime ? APPLICATION_SMIME : APPLICATION_PGP, NULL);
        if (p)
        {
          char input_signas[128] = { 0 };
          snprintf(input_signas, sizeof(input_signas), "0x%s", crypt_fpr_or_lkeyid(p));
 
          if (is_smime)
            cs_subset_str_string_set(NeoMutt->sub, "smime_sign_as", input_signas, NULL);
          else
            cs_subset_str_string_set(NeoMutt->sub, "pgp_sign_as", input_signas, NULL);
 
          crypt_key_free(&p);
 
          e->security |= SEC_SIGN;
        }
        break;
 
      case 'b': /* (b)oth */
        e->security |= (SEC_ENCRYPT | SEC_SIGN);
        break;
 
      case 'C':
        e->security &= ~SEC_SIGN;
        break;
 
      case 'c': /* (c)lear */
        e->security &= ~(SEC_ENCRYPT | SEC_SIGN);
        break;
 
      case 'e': /* (e)ncrypt */
        e->security |= SEC_ENCRYPT;
        e->security &= ~SEC_SIGN;
        break;
 
      case 'm': /* (p)gp or s/(m)ime */
      case 'p':
        is_smime = !is_smime;
        if (is_smime)
        {
          e->security &= ~APPLICATION_PGP;
          e->security |= APPLICATION_SMIME;
        }
        else
        {
          e->security &= ~APPLICATION_SMIME;
          e->security |= APPLICATION_PGP;
        }
        crypt_opportunistic_encrypt(e);
        break;
 
      case 'O': /* oppenc mode on */
        e->security |= SEC_OPPENCRYPT;
        crypt_opportunistic_encrypt(e);
        break;
 
      case 'o': /* oppenc mode off */
        e->security &= ~SEC_OPPENCRYPT;
        break;
 
      case 'S': /* (s)ign in oppenc mode */
        e->security |= SEC_SIGN;
        break;
 
      case 's': /* (s)ign */
        e->security &= ~SEC_ENCRYPT;
        e->security |= SEC_SIGN;
        break;
    }
  }
 
  return e->security;
}

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verify_sender()

static bool verify_sender ( struct Email *  e )

static

Verify the sender of a message.

Parameters

e

Email

Return values

true	Sender is verified

Definition at line 4066 of file crypt_gpgme.c.

{
  struct Address *sender = NULL;
  bool rc = true;
 
  if (!TAILQ_EMPTY(&e->env->from))
  {
    mutt_expand_aliases(&e->env->from);
    sender = TAILQ_FIRST(&e->env->from);
  }
  else if (!TAILQ_EMPTY(&e->env->sender))
  {
    mutt_expand_aliases(&e->env->sender);
    sender = TAILQ_FIRST(&e->env->sender);
  }
 
  if (sender)
  {
    if (SignatureKey)
    {
      gpgme_key_t key = SignatureKey;
      gpgme_user_id_t uid = NULL;
      int sender_length = buf_len(sender->mailbox);
      for (uid = key->uids; uid && rc; uid = uid->next)
      {
        int uid_length = strlen(uid->email);
        if ((uid->email[0] == '<') && (uid->email[uid_length - 1] == '>') &&
            (uid_length == (sender_length + 2)))
        {
          const char *at_sign = strchr(uid->email + 1, '@');
          if (at_sign)
          {
            /* Assume address is 'mailbox@domainname'.
             * The mailbox part is case-sensitive,
             * the domainname is not. (RFC2821) */
            const char *tmp_email = uid->email + 1;
            const char *tmp_sender = buf_string(sender->mailbox);
            /* length of mailbox part including '@' */
            int mailbox_length = at_sign - tmp_email + 1;
            int domainname_length = sender_length - mailbox_length;
            int mailbox_match, domainname_match;
 
            mailbox_match = mutt_strn_equal(tmp_email, tmp_sender, mailbox_length);
            tmp_email += mailbox_length;
            tmp_sender += mailbox_length;
            domainname_match = (mutt_istrn_cmp(tmp_email, tmp_sender, domainname_length) == 0);
            if (mailbox_match && domainname_match)
              rc = false;
          }
          else
          {
            if (mutt_strn_equal(uid->email + 1, buf_string(sender->mailbox), sender_length))
              rc = false;
          }
        }
      }
    }
    else
    {
      mutt_any_key_to_continue(_("Failed to verify sender"));
    }
  }
  else
  {
    mutt_any_key_to_continue(_("Failed to figure out sender"));
  }
 
  if (SignatureKey)
  {
    gpgme_key_unref(SignatureKey);
    SignatureKey = NULL;
  }
 
  return rc;
}

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mutt_gpgme_print_version()

const char * mutt_gpgme_print_version

(

void

)

Get version of GPGME.

Return values

ptr	GPGME version string

Definition at line 4164 of file crypt_gpgme.c.

{
  return GPGME_VERSION;
}

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Variable Documentation

IdDefaults

struct CryptCache* IdDefaults = NULL

static

Cache of GPGME keys.

Definition at line 92 of file crypt_gpgme.c.

SignatureKey

gpgme_key_t SignatureKey = NULL

static

PGP Key to sign with.

Definition at line 94 of file crypt_gpgme.c.

CurrentSender

char* CurrentSender = NULL

static

Email address of the sender.

Definition at line 96 of file crypt_gpgme.c.