API for encryption/signing of emails. More...

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

Include dependency graph for lib.h:

Macros
#define	SEC_NO_FLAGS 0
	No flags are set. More...

#define	SEC_ENCRYPT (1 << 0)
	Email is encrypted. More...

#define	SEC_SIGN (1 << 1)
	Email is signed. More...

#define	SEC_GOODSIGN (1 << 2)
	Email has a valid signature. More...

#define	SEC_BADSIGN (1 << 3)
	Email has a bad signature. More...

#define	SEC_PARTSIGN (1 << 4)
	Not all parts of the email is signed. More...

#define	SEC_SIGNOPAQUE (1 << 5)
	Email has an opaque signature (encrypted) More...

#define	SEC_KEYBLOCK (1 << 6)
	Email has a key attached. More...

#define	SEC_INLINE (1 << 7)
	Email has an inline signature. More...

#define	SEC_OPPENCRYPT (1 << 8)
	Opportunistic encrypt mode. More...

#define	SEC_AUTOCRYPT (1 << 9)
	(Autocrypt) Message will be, or was Autocrypt encrypt+signed More...

#define	SEC_AUTOCRYPT_OVERRIDE (1 << 10)
	(Autocrypt) Indicates manual set/unset of encryption More...

#define	APPLICATION_PGP (1 << 11)
	Use PGP to encrypt/sign. More...

#define	APPLICATION_SMIME (1 << 12)
	Use SMIME to encrypt/sign. More...

#define	PGP_TRADITIONAL_CHECKED (1 << 13)
	Email has a traditional (inline) signature. More...

#define	SEC_ALL_FLAGS ((1 << 14) - 1)

#define	PGP_ENCRYPT (APPLICATION_PGP \| SEC_ENCRYPT)

#define	PGP_SIGN (APPLICATION_PGP \| SEC_SIGN)

#define	PGP_GOODSIGN (APPLICATION_PGP \| SEC_GOODSIGN)

#define	PGP_KEY (APPLICATION_PGP \| SEC_KEYBLOCK)

#define	PGP_INLINE (APPLICATION_PGP \| SEC_INLINE)

#define	SMIME_ENCRYPT (APPLICATION_SMIME \| SEC_ENCRYPT)

#define	SMIME_SIGN (APPLICATION_SMIME \| SEC_SIGN)

#define	SMIME_GOODSIGN (APPLICATION_SMIME \| SEC_GOODSIGN)

#define	SMIME_BADSIGN (APPLICATION_SMIME \| SEC_BADSIGN)

#define	SMIME_OPAQUE (APPLICATION_SMIME \| SEC_SIGNOPAQUE)

#define	WithCrypto (APPLICATION_PGP \| APPLICATION_SMIME)

#define	KEYFLAG_NO_FLAGS 0
	No flags are set. More...

#define	KEYFLAG_CANSIGN (1 << 0)
	Key is suitable for signing. More...

#define	KEYFLAG_CANENCRYPT (1 << 1)
	Key is suitable for encryption. More...

#define	KEYFLAG_ISX509 (1 << 2)
	Key is an X.509 key. More...

#define	KEYFLAG_SECRET (1 << 7)
	Key is a secret key. More...

#define	KEYFLAG_EXPIRED (1 << 8)
	Key is expired. More...

#define	KEYFLAG_REVOKED (1 << 9)
	Key is revoked. More...

#define	KEYFLAG_DISABLED (1 << 10)
	Key is marked disabled. More...

#define	KEYFLAG_SUBKEY (1 << 11)
	Key is a subkey. More...

#define	KEYFLAG_CRITICAL (1 << 12)
	Key is marked critical. More...

#define	KEYFLAG_PREFER_ENCRYPTION (1 << 13)
	Key's owner prefers encryption. More...

#define	KEYFLAG_PREFER_SIGNING (1 << 14)
	Key's owner prefers signing. More...

#define	KEYFLAG_CANTUSE (KEYFLAG_DISABLED \| KEYFLAG_REVOKED \| KEYFLAG_EXPIRED)

#define	KEYFLAG_RESTRICTIONS (KEYFLAG_CANTUSE \| KEYFLAG_CRITICAL)

#define	KEYFLAG_ABILITIES (KEYFLAG_CANSIGN \| KEYFLAG_CANENCRYPT \| KEYFLAG_PREFER_ENCRYPTION \| KEYFLAG_PREFER_SIGNING)

Typedefs
typedef uint16_t	SecurityFlags
	Flags, e.g. SEC_ENCRYPT. More...

typedef uint16_t	KeyFlags
	Flags describing PGP/SMIME keys, e.g. KEYFLAG_CANSIGN. More...

Functions
void	crypt_extract_keys_from_messages (struct Mailbox m, struct EmailList el)
	Extract keys from a message. More...

void	crypt_forget_passphrase (void)
	Forget a passphrase and display a message. More...

int	crypt_get_keys (struct Email e, char *keylist, bool oppenc_mode)
	Check we have all the keys we need. More...

void	crypt_opportunistic_encrypt (struct Email *e)
	Can all recipients be determined. More...

SecurityFlags	crypt_query (struct Body *m)
	Check out the type of encryption used. More...

bool	crypt_valid_passphrase (SecurityFlags flags)
	Check that we have a usable passphrase, ask if not. More...

SecurityFlags	mutt_is_application_pgp (struct Body *m)
	Does the message use PGP? More...

SecurityFlags	mutt_is_application_smime (struct Body *m)
	Does the message use S/MIME? More...

SecurityFlags	mutt_is_malformed_multipart_pgp_encrypted (struct Body *b)
	Check for malformed layout. More...

SecurityFlags	mutt_is_multipart_encrypted (struct Body *b)
	Does the message have encrypted parts? More...

SecurityFlags	mutt_is_multipart_signed (struct Body *b)
	Is a message signed? More...

int	mutt_is_valid_multipart_pgp_encrypted (struct Body *b)
	Is this a valid multi-part encrypted message? More...

int	mutt_protect (struct Email e, char keylist, bool postpone)
	Encrypt and/or sign a message. More...

int	mutt_protected_headers_handler (struct Body m, struct State s)
	Process a protected header - Implements handler_t. More...

bool	mutt_should_hide_protected_subject (struct Email *e)
	Should NeoMutt hide the protected subject? More...

int	mutt_signed_handler (struct Body a, struct State s)
	Verify a "multipart/signed" body - Implements handler_t. More...

void	crypt_cleanup (void)
	Clean up backend. More...

bool	crypt_has_module_backend (SecurityFlags type)
	Is there a crypto backend for a given type? More...

void	crypt_init (void)
	Initialise the crypto backends. More...

void	crypt_invoke_message (SecurityFlags type)
	Display an informative message. More...

int	crypt_pgp_application_handler (struct Body m, struct State s)
	Wrapper for CryptModuleSpecs::application_handler() More...

int	crypt_pgp_check_traditional (FILE fp, struct Body b, bool just_one)
	Wrapper for CryptModuleSpecs::pgp_check_traditional() More...

int	crypt_pgp_decrypt_mime (FILE fp_in, FILE fp_out, struct Body b, struct Body **cur)
	Wrapper for CryptModuleSpecs::decrypt_mime() More...

int	crypt_pgp_encrypted_handler (struct Body a, struct State s)
	Wrapper for CryptModuleSpecs::encrypted_handler() More...

void	crypt_pgp_extract_key_from_attachment (FILE fp, struct Body top)
	Wrapper for CryptModuleSpecs::pgp_extract_key_from_attachment() More...

void	crypt_pgp_invoke_getkeys (struct Address *addr)
	Wrapper for CryptModuleSpecs::pgp_invoke_getkeys() More...

struct Body *	crypt_pgp_make_key_attachment (void)
	Wrapper for CryptModuleSpecs::pgp_make_key_attachment() More...

int	crypt_pgp_send_menu (struct Email *e)
	Wrapper for CryptModuleSpecs::send_menu() More...

int	crypt_smime_application_handler (struct Body m, struct State s)
	Wrapper for CryptModuleSpecs::application_handler() More...

int	crypt_smime_decrypt_mime (FILE fp_in, FILE fp_out, struct Body b, struct Body **cur)
	Wrapper for CryptModuleSpecs::decrypt_mime() More...

void	crypt_smime_getkeys (struct Envelope *env)
	Wrapper for CryptModuleSpecs::smime_getkeys() More...

int	crypt_smime_send_menu (struct Email *e)
	Wrapper for CryptModuleSpecs::send_menu() More...

int	crypt_smime_verify_sender (struct Mailbox m, struct Email e)
	Wrapper for CryptModuleSpecs::smime_verify_sender() More...

void	crypto_module_free (void)
	Clean up the crypto modules. More...

void	pgp_gpgme_init (void)
	Implements CryptModuleSpecs::init() More...

int	mutt_gpgme_select_secret_key (struct Buffer *keyid)
	Select a private Autocrypt key for a new account. More...

const char *	mutt_gpgme_print_version (void)
	Get version of GPGME. More...

Variables
bool	C_CryptOpportunisticEncrypt
	Config: Enable encryption when the recipient's key is available. More...

bool	C_CryptProtectedHeadersRead
	Config: Display protected headers (Memory Hole) in the pager. More...

bool	C_CryptProtectedHeadersSave
	Config: Save the cleartext Subject with the headers. More...

unsigned char	C_CryptVerifySig
	Config: Verify PGP or SMIME signatures. More...

bool	C_PgpAutoDecode
	Config: Automatically decrypt PGP messages. More...

char *	C_PgpSignAs
	Config: Use this alternative key for signing messages. More...

char *	C_SmimeEncryptWith
	Config: Algorithm for encryption. More...

bool	C_SmimeIsDefault
	Config: Use SMIME rather than PGP by default. More...

char *	C_SmimeSignAs
	Config: Use this alternative key for signing messages. More...

Detailed Description

API for encryption/signing of emails.

Authors

Werner Koch
g10code GmbH
Pietro Cerutti

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 lib.h.

Macro Definition Documentation

◆ SEC_NO_FLAGS

#define SEC_NO_FLAGS 0

No flags are set.

Definition at line 84 of file lib.h.

◆ SEC_ENCRYPT

#define SEC_ENCRYPT (1 << 0)

Email is encrypted.

Definition at line 85 of file lib.h.

◆ SEC_SIGN

#define SEC_SIGN (1 << 1)

Email is signed.

Definition at line 86 of file lib.h.

◆ SEC_GOODSIGN

#define SEC_GOODSIGN (1 << 2)

Email has a valid signature.

Definition at line 87 of file lib.h.

◆ SEC_BADSIGN

#define SEC_BADSIGN (1 << 3)

Email has a bad signature.

Definition at line 88 of file lib.h.

◆ SEC_PARTSIGN

#define SEC_PARTSIGN (1 << 4)

Not all parts of the email is signed.

Definition at line 89 of file lib.h.

◆ SEC_SIGNOPAQUE

#define SEC_SIGNOPAQUE (1 << 5)

Email has an opaque signature (encrypted)

Definition at line 90 of file lib.h.

◆ SEC_KEYBLOCK

#define SEC_KEYBLOCK (1 << 6)

Email has a key attached.

Definition at line 91 of file lib.h.

◆ SEC_INLINE

#define SEC_INLINE (1 << 7)

Email has an inline signature.

Definition at line 92 of file lib.h.

◆ SEC_OPPENCRYPT

#define SEC_OPPENCRYPT (1 << 8)

Opportunistic encrypt mode.

Definition at line 93 of file lib.h.

◆ SEC_AUTOCRYPT

#define SEC_AUTOCRYPT (1 << 9)

(Autocrypt) Message will be, or was Autocrypt encrypt+signed

Definition at line 94 of file lib.h.

◆ SEC_AUTOCRYPT_OVERRIDE

#define SEC_AUTOCRYPT_OVERRIDE (1 << 10)

(Autocrypt) Indicates manual set/unset of encryption

Definition at line 95 of file lib.h.

◆ APPLICATION_PGP

#define APPLICATION_PGP (1 << 11)

Use PGP to encrypt/sign.

Definition at line 97 of file lib.h.

◆ APPLICATION_SMIME

#define APPLICATION_SMIME (1 << 12)

Use SMIME to encrypt/sign.

Definition at line 98 of file lib.h.

◆ PGP_TRADITIONAL_CHECKED

#define PGP_TRADITIONAL_CHECKED (1 << 13)

Email has a traditional (inline) signature.

Definition at line 99 of file lib.h.

◆ SEC_ALL_FLAGS

#define SEC_ALL_FLAGS ((1 << 14) - 1)

Definition at line 101 of file lib.h.

◆ PGP_ENCRYPT

#define PGP_ENCRYPT (APPLICATION_PGP | SEC_ENCRYPT)

Definition at line 103 of file lib.h.

◆ PGP_SIGN

#define PGP_SIGN (APPLICATION_PGP | SEC_SIGN)

Definition at line 104 of file lib.h.

◆ PGP_GOODSIGN

#define PGP_GOODSIGN (APPLICATION_PGP | SEC_GOODSIGN)

Definition at line 105 of file lib.h.

◆ PGP_KEY

#define PGP_KEY (APPLICATION_PGP | SEC_KEYBLOCK)

Definition at line 106 of file lib.h.

◆ PGP_INLINE

#define PGP_INLINE (APPLICATION_PGP | SEC_INLINE)

Definition at line 107 of file lib.h.

◆ SMIME_ENCRYPT

#define SMIME_ENCRYPT (APPLICATION_SMIME | SEC_ENCRYPT)

Definition at line 109 of file lib.h.

◆ SMIME_SIGN

#define SMIME_SIGN (APPLICATION_SMIME | SEC_SIGN)

Definition at line 110 of file lib.h.

◆ SMIME_GOODSIGN

#define SMIME_GOODSIGN (APPLICATION_SMIME | SEC_GOODSIGN)

Definition at line 111 of file lib.h.

◆ SMIME_BADSIGN

#define SMIME_BADSIGN (APPLICATION_SMIME | SEC_BADSIGN)

Definition at line 112 of file lib.h.

◆ SMIME_OPAQUE

#define SMIME_OPAQUE (APPLICATION_SMIME | SEC_SIGNOPAQUE)

Definition at line 113 of file lib.h.

◆ WithCrypto

#define WithCrypto (APPLICATION_PGP | APPLICATION_SMIME)

Definition at line 123 of file lib.h.

◆ KEYFLAG_NO_FLAGS

#define KEYFLAG_NO_FLAGS 0

No flags are set.

Definition at line 133 of file lib.h.

◆ KEYFLAG_CANSIGN

#define KEYFLAG_CANSIGN (1 << 0)

Key is suitable for signing.

Definition at line 134 of file lib.h.

◆ KEYFLAG_CANENCRYPT

#define KEYFLAG_CANENCRYPT (1 << 1)

Key is suitable for encryption.

Definition at line 135 of file lib.h.

◆ KEYFLAG_ISX509

#define KEYFLAG_ISX509 (1 << 2)

Key is an X.509 key.

Definition at line 136 of file lib.h.

◆ KEYFLAG_SECRET

#define KEYFLAG_SECRET (1 << 7)

Key is a secret key.

Definition at line 137 of file lib.h.

◆ KEYFLAG_EXPIRED

#define KEYFLAG_EXPIRED (1 << 8)

Key is expired.

Definition at line 138 of file lib.h.

◆ KEYFLAG_REVOKED

#define KEYFLAG_REVOKED (1 << 9)

Key is revoked.

Definition at line 139 of file lib.h.

◆ KEYFLAG_DISABLED

#define KEYFLAG_DISABLED (1 << 10)

Key is marked disabled.

Definition at line 140 of file lib.h.

◆ KEYFLAG_SUBKEY

#define KEYFLAG_SUBKEY (1 << 11)

Key is a subkey.

Definition at line 141 of file lib.h.

◆ KEYFLAG_CRITICAL

#define KEYFLAG_CRITICAL (1 << 12)

Key is marked critical.

Definition at line 142 of file lib.h.

◆ KEYFLAG_PREFER_ENCRYPTION

#define KEYFLAG_PREFER_ENCRYPTION (1 << 13)

Key's owner prefers encryption.

Definition at line 143 of file lib.h.

◆ KEYFLAG_PREFER_SIGNING

#define KEYFLAG_PREFER_SIGNING (1 << 14)

Key's owner prefers signing.

Definition at line 144 of file lib.h.

◆ KEYFLAG_CANTUSE

#define KEYFLAG_CANTUSE (KEYFLAG_DISABLED | KEYFLAG_REVOKED | KEYFLAG_EXPIRED)

Definition at line 146 of file lib.h.

◆ KEYFLAG_RESTRICTIONS

#define KEYFLAG_RESTRICTIONS (KEYFLAG_CANTUSE | KEYFLAG_CRITICAL)

Definition at line 147 of file lib.h.

◆ KEYFLAG_ABILITIES

#define KEYFLAG_ABILITIES (KEYFLAG_CANSIGN | KEYFLAG_CANENCRYPT | KEYFLAG_PREFER_ENCRYPTION | KEYFLAG_PREFER_SIGNING)

Definition at line 149 of file lib.h.

Typedef Documentation

◆ SecurityFlags

typedef uint16_t SecurityFlags

Flags, e.g. SEC_ENCRYPT.

Definition at line 83 of file lib.h.

◆ KeyFlags

typedef uint16_t KeyFlags

Flags describing PGP/SMIME keys, e.g. KEYFLAG_CANSIGN.

Definition at line 132 of file lib.h.

Function Documentation

◆ crypt_extract_keys_from_messages()

void crypt_extract_keys_from_messages	(	struct Mailbox *	m,
		struct EmailList *	el
	)

Extract keys from a message.

Parameters

m	Mailbox
el	List of Emails to process

The extracted keys will be added to the user's keyring.

Definition at line 844 of file crypt.c.

 {
   if (!WithCrypto)
     return;
 
   struct Buffer *tempfname = mutt_buffer_pool_get();
   mutt_buffer_mktemp(tempfname);
   FILE *fp_out = mutt_file_fopen(mutt_b2s(tempfname), "w");
   if (!fp_out)
   {
     mutt_perror(mutt_b2s(tempfname));
     goto cleanup;
   }
 
   if (WithCrypto & APPLICATION_PGP)
     OptDontHandlePgpKeys = true;
 
   struct EmailNode *en = NULL;
   STAILQ_FOREACH(en, el, entries)
   {
     struct Email *e = en->email;
 
     mutt_parse_mime_message(m, e);
     if (e->security & SEC_ENCRYPT && !crypt_valid_passphrase(e->security))
     {
       mutt_file_fclose(&fp_out);
       break;
     }
 
     if (((WithCrypto & APPLICATION_PGP) != 0) && (e->security & APPLICATION_PGP))
     {
       mutt_copy_message(fp_out, m, e, MUTT_CM_DECODE | MUTT_CM_CHARCONV, CH_NO_FLAGS, 0);
       fflush(fp_out);
 
       mutt_endwin();
       puts(_("Trying to extract PGP keys...\n"));
       crypt_pgp_invoke_import(mutt_b2s(tempfname));
     }
 
     if (((WithCrypto & APPLICATION_SMIME) != 0) && (e->security & APPLICATION_SMIME))
     {
       if (e->security & SEC_ENCRYPT)
       {
         mutt_copy_message(fp_out, m, e, MUTT_CM_NOHEADER | MUTT_CM_DECODE_CRYPT | MUTT_CM_DECODE_SMIME,
                           CH_NO_FLAGS, 0);
       }
       else
         mutt_copy_message(fp_out, m, e, MUTT_CM_NO_FLAGS, CH_NO_FLAGS, 0);
       fflush(fp_out);
 
       char *mbox = NULL;
       if (!TAILQ_EMPTY(&e->env->from))
       {
         mutt_expand_aliases(&e->env->from);
         mbox = TAILQ_FIRST(&e->env->from)->mailbox;
       }
       else if (!TAILQ_EMPTY(&e->env->sender))
       {
         mutt_expand_aliases(&e->env->sender);
         mbox = TAILQ_FIRST(&e->env->sender)->mailbox;
       }
       if (mbox)
       {
         mutt_endwin();
         puts(_("Trying to extract S/MIME certificates..."));
         crypt_smime_invoke_import(mutt_b2s(tempfname), mbox);
       }
     }
 
     rewind(fp_out);
   }
 
   mutt_file_fclose(&fp_out);
   if (isendwin())
     mutt_any_key_to_continue(NULL);
 
   mutt_file_unlink(mutt_b2s(tempfname));
 
   if (WithCrypto & APPLICATION_PGP)
     OptDontHandlePgpKeys = false;
 
 cleanup:
   mutt_buffer_pool_release(&tempfname);
 }

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◆ crypt_forget_passphrase()

void crypt_forget_passphrase ( void )

Forget a passphrase and display a message.

Definition at line 92 of file crypt.c.

 {
   if (WithCrypto & APPLICATION_PGP)
     crypt_pgp_void_passphrase();
 
   if (WithCrypto & APPLICATION_SMIME)
     crypt_smime_void_passphrase();
 
   if (WithCrypto)
   {
     /* L10N: Due to the implementation details (e.g. some passwords are managed
        by gpg-agent) we can't know whether we forgot zero, 1, 12, ...
        passwords. So in English we use "Passphrases". Your language might
        have other means to express this. */
     mutt_message(_("Passphrases forgotten"));
   }
 }

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◆ crypt_get_keys()

int crypt_get_keys	(	struct Email *	e,
		char **	keylist,
		bool	oppenc_mode
	)

Check we have all the keys we need.

Parameters

[in]	e	Email with addresses to match
[out]	keylist	Keys needed
[in]	oppenc_mode	If true, use opportunistic encryption

Return values

0	Success
-1	Error

Do a quick check to make sure that we can find all of the encryption keys if the user has requested this service. Return the list of keys in KEYLIST. If oppenc_mode is true, only keys that can be determined without prompting will be used.

Definition at line 943 of file crypt.c.

 {
   if (!WithCrypto)
     return 0;
 
   struct AddressList addrlist = TAILQ_HEAD_INITIALIZER(addrlist);
   const char *fqdn = mutt_fqdn(true, NeoMutt->sub);
   char *self_encrypt = NULL;
 
   /* Do a quick check to make sure that we can find all of the encryption
    * keys if the user has requested this service.  */
 
   *keylist = NULL;
 
 #ifdef USE_AUTOCRYPT
   if (!oppenc_mode && (e->security & SEC_AUTOCRYPT))
   {
     if (mutt_autocrypt_ui_recommendation(e, keylist) <= AUTOCRYPT_REC_NO)
       return -1;
     return 0;
   }
 #endif
 
   if (WithCrypto & APPLICATION_PGP)
     OptPgpCheckTrust = true;
 
   mutt_addrlist_copy(&addrlist, &e->env->to, false);
   mutt_addrlist_copy(&addrlist, &e->env->cc, false);
   mutt_addrlist_copy(&addrlist, &e->env->bcc, false);
   mutt_addrlist_qualify(&addrlist, fqdn);
   mutt_addrlist_dedupe(&addrlist);
 
   if (oppenc_mode || (e->security & SEC_ENCRYPT))
   {
     if (((WithCrypto & APPLICATION_PGP) != 0) && (e->security & APPLICATION_PGP))
     {
       *keylist = crypt_pgp_find_keys(&addrlist, oppenc_mode);
       if (!*keylist)
       {
         mutt_addrlist_clear(&addrlist);
         return -1;
       }
       OptPgpCheckTrust = false;
       if (C_PgpSelfEncrypt || (C_PgpEncryptSelf == MUTT_YES))
         self_encrypt = C_PgpDefaultKey;
     }
     if (((WithCrypto & APPLICATION_SMIME) != 0) && (e->security & APPLICATION_SMIME))
     {
       *keylist = crypt_smime_find_keys(&addrlist, oppenc_mode);
       if (!*keylist)
       {
         mutt_addrlist_clear(&addrlist);
         return -1;
       }
       if (C_SmimeSelfEncrypt || (C_SmimeEncryptSelf == MUTT_YES))
         self_encrypt = C_SmimeDefaultKey;
     }
   }
 
   if (!oppenc_mode && self_encrypt)
   {
     const size_t keylist_size = mutt_str_len(*keylist);
     mutt_mem_realloc(keylist, keylist_size + mutt_str_len(self_encrypt) + 2);
     sprintf(*keylist + keylist_size, " %s", self_encrypt);
   }
 
   mutt_addrlist_clear(&addrlist);
 
   return 0;
 }

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◆ crypt_opportunistic_encrypt()

void crypt_opportunistic_encrypt ( struct Email * e )

Can all recipients be determined.

Parameters

e Email

Check if all recipients keys can be automatically determined. Enable encryption if they can, otherwise disable encryption.

Definition at line 1021 of file crypt.c.

 {
   if (!WithCrypto)
     return;
 
   if (!(C_CryptOpportunisticEncrypt && (e->security & SEC_OPPENCRYPT)))
     return;
 
   char *pgpkeylist = NULL;
 
   crypt_get_keys(e, &pgpkeylist, 1);
   if (pgpkeylist)
   {
     e->security |= SEC_ENCRYPT;
     FREE(&pgpkeylist);
   }
   else
   {
     e->security &= ~SEC_ENCRYPT;
   }
 }

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◆ crypt_query()

SecurityFlags crypt_query ( struct Body * m )

Check out the type of encryption used.

Parameters

m	Body of email

Return values

num	Flags, see SecurityFlags
0	Error (SEC_NO_FLAGS)

Set the cached status values if there are any.

Definition at line 685 of file crypt.c.

 {
   if (!WithCrypto || !m)
     return SEC_NO_FLAGS;
 
   SecurityFlags rc = SEC_NO_FLAGS;
 
   if (m->type == TYPE_APPLICATION)
   {
     if (WithCrypto & APPLICATION_PGP)
       rc |= mutt_is_application_pgp(m);
 
     if (WithCrypto & APPLICATION_SMIME)
     {
       rc |= mutt_is_application_smime(m);
       if (rc && m->goodsig)
         rc |= SEC_GOODSIGN;
       if (rc && m->badsig)
         rc |= SEC_BADSIGN;
     }
   }
   else if (((WithCrypto & APPLICATION_PGP) != 0) && (m->type == TYPE_TEXT))
   {
     rc |= mutt_is_application_pgp(m);
     if (rc && m->goodsig)
       rc |= SEC_GOODSIGN;
   }
 
   if (m->type == TYPE_MULTIPART)
   {
     rc |= mutt_is_multipart_encrypted(m);
     rc |= mutt_is_multipart_signed(m);
     rc |= mutt_is_malformed_multipart_pgp_encrypted(m);
 
     if (rc && m->goodsig)
       rc |= SEC_GOODSIGN;
 #ifdef USE_AUTOCRYPT
     if (rc && m->is_autocrypt)
       rc |= SEC_AUTOCRYPT;
 #endif
   }
 
   if ((m->type == TYPE_MULTIPART) || (m->type == TYPE_MESSAGE))
   {
     SecurityFlags u = m->parts ? SEC_ALL_FLAGS : SEC_NO_FLAGS; /* Bits set in all parts */
     SecurityFlags w = SEC_NO_FLAGS; /* Bits set in any part  */
 
     for (struct Body *b = m->parts; b; b = b->next)
     {
       const SecurityFlags v = crypt_query(b);
       u &= v;
       w |= v;
     }
     rc |= u | (w & ~SEC_GOODSIGN);
 
     if ((w & SEC_GOODSIGN) && !(u & SEC_GOODSIGN))
       rc |= SEC_PARTSIGN;
   }
 
   return rc;
 }

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◆ crypt_valid_passphrase()

bool crypt_valid_passphrase ( SecurityFlags flags )

Check that we have a usable passphrase, ask if not.

Parameters

flags Flags, see SecurityFlags

Return values

true	Success
false	Failed

Definition at line 134 of file crypt.c.

 {
   bool rc = false;
 
 #ifndef DEBUG
   disable_coredumps();
 #endif
 
   if (((WithCrypto & APPLICATION_PGP) != 0) && (flags & APPLICATION_PGP))
     rc = crypt_pgp_valid_passphrase();
 
   if (((WithCrypto & APPLICATION_SMIME) != 0) && (flags & APPLICATION_SMIME))
     rc = crypt_smime_valid_passphrase();
 
   return rc;
 }

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◆ mutt_is_application_pgp()

SecurityFlags mutt_is_application_pgp ( struct Body * m )

Does the message use PGP?

Parameters

m	Body of email

Return values

>0	Message uses PGP, e.g. PGP_ENCRYPT
0	Message doesn't use PGP, (SEC_NO_FLAGS)

Definition at line 552 of file crypt.c.

 {
   SecurityFlags t = SEC_NO_FLAGS;
   char *p = NULL;
 
   if (m->type == TYPE_APPLICATION)
   {
     if (mutt_istr_equal(m->subtype, "pgp") ||
         mutt_istr_equal(m->subtype, "x-pgp-message"))
     {
       p = mutt_param_get(&m->parameter, "x-action");
       if (p && (mutt_istr_equal(p, "sign") || mutt_istr_equal(p, "signclear")))
       {
         t |= PGP_SIGN;
       }
 
       p = mutt_param_get(&m->parameter, "format");
       if (p && mutt_istr_equal(p, "keys-only"))
       {
         t |= PGP_KEY;
       }
 
       if (t == SEC_NO_FLAGS)
         t |= PGP_ENCRYPT; /* not necessarily correct, but... */
     }
 
     if (mutt_istr_equal(m->subtype, "pgp-signed"))
       t |= PGP_SIGN;
 
     if (mutt_istr_equal(m->subtype, "pgp-keys"))
       t |= PGP_KEY;
   }
   else if ((m->type == TYPE_TEXT) && mutt_istr_equal("plain", m->subtype))
   {
     if (((p = mutt_param_get(&m->parameter, "x-mutt-action")) ||
          (p = mutt_param_get(&m->parameter, "x-action")) ||
          (p = mutt_param_get(&m->parameter, "action"))) &&
         mutt_istr_startswith(p, "pgp-sign"))
     {
       t |= PGP_SIGN;
     }
     else if (p && mutt_istr_startswith(p, "pgp-encrypt"))
       t |= PGP_ENCRYPT;
     else if (p && mutt_istr_startswith(p, "pgp-keys"))
       t |= PGP_KEY;
   }
   if (t)
     t |= PGP_INLINE;
 
   return t;
 }

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◆ mutt_is_application_smime()

SecurityFlags mutt_is_application_smime ( struct Body * m )

Does the message use S/MIME?

Parameters

m	Body of email

Return values

>0	Message uses S/MIME, e.g. SMIME_ENCRYPT
0	Message doesn't use S/MIME, (SEC_NO_FLAGS)

Definition at line 610 of file crypt.c.

 {
   if (!m)
     return SEC_NO_FLAGS;
 
   if (((m->type & TYPE_APPLICATION) == 0) || !m->subtype)
     return SEC_NO_FLAGS;
 
   char *t = NULL;
   bool complain = false;
   /* S/MIME MIME types don't need x- anymore, see RFC2311 */
   if (mutt_istr_equal(m->subtype, "x-pkcs7-mime") || mutt_istr_equal(m->subtype, "pkcs7-mime"))
   {
     t = mutt_param_get(&m->parameter, "smime-type");
     if (t)
     {
       if (mutt_istr_equal(t, "enveloped-data"))
         return SMIME_ENCRYPT;
       if (mutt_istr_equal(t, "signed-data"))
         return SMIME_SIGN | SMIME_OPAQUE;
       return SEC_NO_FLAGS;
     }
     /* Netscape 4.7 uses
      * Content-Description: S/MIME Encrypted Message
      * instead of Content-Type parameter */
     if (mutt_istr_equal(m->description, "S/MIME Encrypted Message"))
       return SMIME_ENCRYPT;
     complain = true;
   }
   else if (!mutt_istr_equal(m->subtype, "octet-stream"))
     return SEC_NO_FLAGS;
 
   t = mutt_param_get(&m->parameter, "name");
 
   if (!t)
     t = m->d_filename;
   if (!t)
     t = m->filename;
   if (!t)
   {
     if (complain)
     {
       mutt_message(
           _("S/MIME messages with no hints on content are unsupported"));
     }
     return SEC_NO_FLAGS;
   }
 
   /* no .p7c, .p10 support yet. */
 
   int len = mutt_str_len(t) - 4;
   if ((len > 0) && (*(t + len) == '.'))
   {
     len++;
     if (mutt_istr_equal((t + len), "p7m"))
     {
       /* Not sure if this is the correct thing to do, but
        * it's required for compatibility with Outlook */
       return SMIME_SIGN | SMIME_OPAQUE;
     }
     else if (mutt_istr_equal((t + len), "p7s"))
       return SMIME_SIGN | SMIME_OPAQUE;
   }
 
   return SEC_NO_FLAGS;
 }

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◆ mutt_is_malformed_multipart_pgp_encrypted()

SecurityFlags mutt_is_malformed_multipart_pgp_encrypted ( struct Body * b )

Check for malformed layout.

Parameters

b	Body of email

Return values

num	Success, see SecurityFlags
0	Error, (SEC_NO_FLAGS)

This checks for the malformed layout caused by MS Exchange in some cases:

<multipart/mixed>
   <text/plain>
   <application/pgp-encrypted> [BASE64-encoded]
   <application/octet-stream> [BASE64-encoded]

Definition at line 508 of file crypt.c.

 {
   if (!(WithCrypto & APPLICATION_PGP))
     return SEC_NO_FLAGS;
 
   if (!b || (b->type != TYPE_MULTIPART) || !b->subtype || !mutt_istr_equal(b->subtype, "mixed"))
   {
     return SEC_NO_FLAGS;
   }
 
   b = b->parts;
   if (!b || (b->type != TYPE_TEXT) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "plain") || (b->length != 0))
   {
     return SEC_NO_FLAGS;
   }
 
   b = b->next;
   if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "pgp-encrypted"))
   {
     return SEC_NO_FLAGS;
   }
 
   b = b->next;
   if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "octet-stream"))
   {
     return SEC_NO_FLAGS;
   }
 
   b = b->next;
   if (b)
     return SEC_NO_FLAGS;
 
   return PGP_ENCRYPT;
 }

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◆ mutt_is_multipart_encrypted()

SecurityFlags mutt_is_multipart_encrypted ( struct Body * b )

Does the message have encrypted parts?

Parameters

b	Body of email

Return values

num	Message has got encrypted parts, see SecurityFlags
0	Message hasn't got encrypted parts (SEC_NO_FLAGS)

Definition at line 447 of file crypt.c.

 {
   if ((WithCrypto & APPLICATION_PGP) == 0)
     return SEC_NO_FLAGS;
 
   char *p = NULL;
 
   if (!b || (b->type != TYPE_MULTIPART) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "encrypted") ||
       !(p = mutt_param_get(&b->parameter, "protocol")) ||
       !mutt_istr_equal(p, "application/pgp-encrypted"))
   {
     return SEC_NO_FLAGS;
   }
 
   return PGP_ENCRYPT;
 }

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◆ mutt_is_multipart_signed()

SecurityFlags mutt_is_multipart_signed ( struct Body * b )

Is a message signed?

Parameters

b	Body of email

Return values

num	Message is signed, see SecurityFlags
0	Message is not signed (SEC_NO_FLAGS)

Definition at line 407 of file crypt.c.

 {
   if (!b || (b->type != TYPE_MULTIPART) || !b->subtype || !mutt_istr_equal(b->subtype, "signed"))
   {
     return SEC_NO_FLAGS;
   }
 
   char *p = mutt_param_get(&b->parameter, "protocol");
   if (!p)
     return SEC_NO_FLAGS;
 
   if (mutt_istr_equal(p, "multipart/mixed"))
     return SEC_SIGN;
 
   if (((WithCrypto & APPLICATION_PGP) != 0) &&
       mutt_istr_equal(p, "application/pgp-signature"))
   {
     return PGP_SIGN;
   }
 
   if (((WithCrypto & APPLICATION_SMIME) != 0) &&
       mutt_istr_equal(p, "application/x-pkcs7-signature"))
   {
     return SMIME_SIGN;
   }
   if (((WithCrypto & APPLICATION_SMIME) != 0) &&
       mutt_istr_equal(p, "application/pkcs7-signature"))
   {
     return SMIME_SIGN;
   }
 
   return SEC_NO_FLAGS;
 }

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◆ mutt_is_valid_multipart_pgp_encrypted()

int mutt_is_valid_multipart_pgp_encrypted ( struct Body * b )

Is this a valid multi-part encrypted message?

Parameters

b	Body of email

Return values

>0	Message is valid, with encrypted parts, e.g. PGP_ENCRYPT
0	Message hasn't got encrypted parts

Definition at line 471 of file crypt.c.

 {
   if (mutt_is_multipart_encrypted(b) == SEC_NO_FLAGS)
     return 0;
 
   b = b->parts;
   if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "pgp-encrypted"))
   {
     return 0;
   }
 
   b = b->next;
   if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
       !mutt_istr_equal(b->subtype, "octet-stream"))
   {
     return 0;
   }
 
   return PGP_ENCRYPT;
 }

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◆ mutt_protect()

int mutt_protect	(	struct Email *	e,
		char *	keylist,
		bool	postpone
	)

Encrypt and/or sign a message.

Parameters

e	Email
keylist	List of keys to encrypt to (space-separated)
postpone	When true, signing is automatically disabled

Return values

0	Success
-1	Error

Definition at line 159 of file crypt.c.

 {
   struct Body *pbody = NULL, *tmp_pbody = NULL;
   struct Body *tmp_smime_pbody = NULL;
   struct Body *tmp_pgp_pbody = NULL;
   bool has_retainable_sig = false;
 
   if (!WithCrypto)
     return -1;
 
   int security = e->security;
   int sign = security & (SEC_AUTOCRYPT | SEC_SIGN);
   if (postpone)
   {
     sign = SEC_NO_FLAGS;
     security &= ~SEC_SIGN;
   }
 
   if (!(security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) && !sign)
     return 0;
 
   if (sign && !(security & SEC_AUTOCRYPT) && !crypt_valid_passphrase(security))
     return -1;
 
   if (((WithCrypto & APPLICATION_PGP) != 0) && !(security & SEC_AUTOCRYPT) &&
       ((security & PGP_INLINE) == PGP_INLINE))
   {
     if ((e->body->type != TYPE_TEXT) ||
         !mutt_istr_equal(e->body->subtype, "plain"))
     {
       if (query_quadoption(C_PgpMimeAuto,
                            _("Inline PGP can't be used with attachments.  "
                              "Revert to PGP/MIME?")) != MUTT_YES)
       {
         mutt_error(
             _("Mail not sent: inline PGP can't be used with attachments"));
         return -1;
       }
     }
     else if (mutt_istr_equal("flowed",
                              mutt_param_get(&e->body->parameter, "format")))
     {
       if ((query_quadoption(C_PgpMimeAuto,
                             _("Inline PGP can't be used with format=flowed.  "
                               "Revert to PGP/MIME?"))) != MUTT_YES)
       {
         mutt_error(
             _("Mail not sent: inline PGP can't be used with format=flowed"));
         return -1;
       }
     }
     else
     {
       /* they really want to send it inline... go for it */
       if (!isendwin())
       {
         mutt_endwin();
         puts(_("Invoking PGP..."));
       }
       pbody = crypt_pgp_traditional_encryptsign(e->body, security, keylist);
       if (pbody)
       {
         e->body = pbody;
         return 0;
       }
 
       /* otherwise inline won't work...ask for revert */
       if (query_quadoption(
               C_PgpMimeAuto,
               _("Message can't be sent inline.  Revert to using PGP/MIME?")) != MUTT_YES)
       {
         mutt_error(_("Mail not sent"));
         return -1;
       }
     }
 
     /* go ahead with PGP/MIME */
   }
 
   if (!isendwin())
     mutt_endwin();
 
   if (WithCrypto & APPLICATION_SMIME)
     tmp_smime_pbody = e->body;
   if (WithCrypto & APPLICATION_PGP)
     tmp_pgp_pbody = e->body;
 
 #ifdef CRYPT_BACKEND_GPGME
   if (sign && C_CryptUsePka)
 #else
   if (sign)
 #endif
   {
     /* Set sender (necessary for e.g. PKA).  */
     const char *mailbox = NULL;
     struct Address *from = TAILQ_FIRST(&e->env->from);
     bool free_from = false;
 
     if (!from)
     {
       free_from = true;
       from = mutt_default_from(NeoMutt->sub);
     }
 
     mailbox = from->mailbox;
     if (!mailbox && C_EnvelopeFromAddress)
       mailbox = C_EnvelopeFromAddress->mailbox;
 
     if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
       crypt_smime_set_sender(mailbox);
     else if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP))
       crypt_pgp_set_sender(mailbox);
 
     if (free_from)
       mutt_addr_free(&from);
   }
 
   if (C_CryptProtectedHeadersWrite)
   {
     struct Envelope *protected_headers = mutt_env_new();
     mutt_str_replace(&protected_headers->subject, e->env->subject);
     /* Note: if other headers get added, such as to, cc, then a call to
      * mutt_env_to_intl() will need to be added here too. */
     mutt_prepare_envelope(protected_headers, 0, NeoMutt->sub);
 
     mutt_env_free(&e->body->mime_headers);
     e->body->mime_headers = protected_headers;
     /* Optional part of the draft RFC, but required by Enigmail */
     mutt_param_set(&e->body->parameter, "protected-headers", "v1");
   }
   else
   {
     mutt_param_delete(&e->body->parameter, "protected-headers");
   }
 
 #ifdef USE_AUTOCRYPT
   /* A note about e->body->mime_headers.  If postpone or send
    * fails, the mime_headers is cleared out before returning to the
    * compose menu.  So despite the "robustness" code above and in the
    * gen_gossip_list function below, mime_headers will not be set when
    * entering mutt_protect().
    *
    * This is important to note because the user could toggle
    * $crypt_protected_headers_write or $autocrypt off back in the
    * compose menu.  We don't want mutt_write_rfc822_header() to write
    * stale data from one option if the other is set.
    */
   if (C_Autocrypt && !postpone && (security & SEC_AUTOCRYPT))
   {
     mutt_autocrypt_generate_gossip_list(e);
   }
 #endif
 
   if (sign)
   {
     if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
     {
       tmp_pbody = crypt_smime_sign_message(e->body, &e->env->from);
       if (!tmp_pbody)
         goto bail;
       pbody = tmp_pbody;
       tmp_smime_pbody = tmp_pbody;
     }
 
     if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP) &&
         (!(security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) || C_PgpRetainableSigs))
     {
       tmp_pbody = crypt_pgp_sign_message(e->body, &e->env->from);
       if (!tmp_pbody)
         goto bail;
 
       has_retainable_sig = true;
       sign = SEC_NO_FLAGS;
       pbody = tmp_pbody;
       tmp_pgp_pbody = tmp_pbody;
     }
 
     if ((WithCrypto != 0) && (security & APPLICATION_SMIME) && (security & APPLICATION_PGP))
     {
       /* here comes the draft ;-) */
     }
   }
 
   if (security & (SEC_ENCRYPT | SEC_AUTOCRYPT))
   {
     if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
     {
       tmp_pbody = crypt_smime_build_smime_entity(tmp_smime_pbody, keylist);
       if (!tmp_pbody)
       {
         /* signed ? free it! */
         goto bail;
       }
       /* free tmp_body if messages was signed AND encrypted ... */
       if ((tmp_smime_pbody != e->body) && (tmp_smime_pbody != tmp_pbody))
       {
         /* detach and don't delete e->body,
          * which tmp_smime_pbody->parts after signing. */
         tmp_smime_pbody->parts = tmp_smime_pbody->parts->next;
         e->body->next = NULL;
         mutt_body_free(&tmp_smime_pbody);
       }
       pbody = tmp_pbody;
     }
 
     if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP))
     {
       pbody = crypt_pgp_encrypt_message(e, tmp_pgp_pbody, keylist, sign, &e->env->from);
       if (!pbody)
       {
         /* did we perform a retainable signature? */
         if (has_retainable_sig)
         {
           /* remove the outer multipart layer */
           tmp_pgp_pbody = mutt_remove_multipart(tmp_pgp_pbody);
           /* get rid of the signature */
           mutt_body_free(&tmp_pgp_pbody->next);
         }
 
         goto bail;
       }
 
       // destroy temporary signature envelope when doing retainable signatures.
       if (has_retainable_sig)
       {
         tmp_pgp_pbody = mutt_remove_multipart(tmp_pgp_pbody);
         mutt_body_free(&tmp_pgp_pbody->next);
       }
     }
   }
 
   if (pbody)
   {
     e->body = pbody;
     return 0;
   }
 
 bail:
   mutt_env_free(&e->body->mime_headers);
   return -1;
 }

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◆ mutt_protected_headers_handler()

int mutt_protected_headers_handler	(	struct Body *	m,
		struct State *	s
	)

Process a protected header - Implements handler_t.

Definition at line 1087 of file crypt.c.

 {
   if (C_CryptProtectedHeadersRead && a->mime_headers)
   {
     if (a->mime_headers->subject)
     {
       const bool display = (s->flags & MUTT_DISPLAY);
 
       if (display && C_Weed && mutt_matches_ignore("subject"))
         return 0;
 
       state_mark_protected_header(s);
       int wraplen = display ? mutt_window_wrap_cols(s->wraplen, C_Wrap) : 0;
 
       mutt_write_one_header(s->fp_out, "Subject", a->mime_headers->subject, s->prefix,
                             wraplen, display ? CH_DISPLAY : CH_NO_FLAGS, NeoMutt->sub);
       state_puts(s, "\n");
     }
   }
 
   return 0;
 }

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◆ mutt_should_hide_protected_subject()

bool mutt_should_hide_protected_subject ( struct Email * e )

Should NeoMutt hide the protected subject?

Parameters

e	Email to test

Return values

bool	True if the subject should be protected

Definition at line 1073 of file crypt.c.

 {
   if (C_CryptProtectedHeadersWrite && (e->security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) &&
       !(e->security & SEC_INLINE) && C_CryptProtectedHeadersSubject)
   {
     return true;
   }
 
   return false;
 }

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◆ mutt_signed_handler()

int mutt_signed_handler	(	struct Body *	a,
		struct State *	s
	)

Verify a "multipart/signed" body - Implements handler_t.

Definition at line 1113 of file crypt.c.

 {
   if (!WithCrypto)
     return -1;
 
   bool inconsistent = false;
   struct Body *b = a;
   struct Body **signatures = NULL;
   int sigcnt = 0;
   int rc = 0;
   struct Buffer *tempfile = NULL;
 
   a = a->parts;
   SecurityFlags signed_type = mutt_is_multipart_signed(b);
   if (signed_type == SEC_NO_FLAGS)
   {
     /* A null protocol value is already checked for in mutt_body_handler() */
     state_printf(s,
                  _("[-- Error: "
                    "Unknown multipart/signed protocol %s --]\n\n"),
                  mutt_param_get(&b->parameter, "protocol"));
     return mutt_body_handler(a, s);
   }
 
   if (!(a && a->next))
     inconsistent = true;
   else
   {
     switch (signed_type)
     {
       case SEC_SIGN:
         if ((a->next->type != TYPE_MULTIPART) || !mutt_istr_equal(a->next->subtype, "mixed"))
         {
           inconsistent = true;
         }
         break;
       case PGP_SIGN:
         if ((a->next->type != TYPE_APPLICATION) ||
             !mutt_istr_equal(a->next->subtype, "pgp-signature"))
         {
           inconsistent = true;
         }
         break;
       case SMIME_SIGN:
         if ((a->next->type != TYPE_APPLICATION) ||
             (!mutt_istr_equal(a->next->subtype, "x-pkcs7-signature") &&
              !mutt_istr_equal(a->next->subtype, "pkcs7-signature")))
         {
           inconsistent = true;
         }
         break;
       default:
         inconsistent = true;
     }
   }
   if (inconsistent)
   {
     state_attach_puts(s, _("[-- Error: Missing or bad-format multipart/signed "
                            "signature --]\n\n"));
     return mutt_body_handler(a, s);
   }
 
   if (s->flags & MUTT_DISPLAY)
   {
     crypt_fetch_signatures(&signatures, a->next, &sigcnt);
 
     if (sigcnt != 0)
     {
       tempfile = mutt_buffer_pool_get();
       mutt_buffer_mktemp(tempfile);
       bool goodsig = true;
       if (crypt_write_signed(a, s, mutt_b2s(tempfile)) == 0)
       {
         for (int i = 0; i < sigcnt; i++)
         {
           if (((WithCrypto & APPLICATION_PGP) != 0) &&
               (signatures[i]->type == TYPE_APPLICATION) &&
               mutt_istr_equal(signatures[i]->subtype, "pgp-signature"))
           {
             if (crypt_pgp_verify_one(signatures[i], s, mutt_b2s(tempfile)) != 0)
               goodsig = false;
 
             continue;
           }
 
           if (((WithCrypto & APPLICATION_SMIME) != 0) &&
               (signatures[i]->type == TYPE_APPLICATION) &&
               (mutt_istr_equal(signatures[i]->subtype, "x-pkcs7-signature") ||
                mutt_istr_equal(signatures[i]->subtype, "pkcs7-signature")))
           {
             if (crypt_smime_verify_one(signatures[i], s, mutt_b2s(tempfile)) != 0)
               goodsig = false;
 
             continue;
           }
 
           state_printf(s,
                        _("[-- Warning: "
                          "We can't verify %s/%s signatures. --]\n\n"),
                        TYPE(signatures[i]), signatures[i]->subtype);
         }
       }
 
       mutt_file_unlink(mutt_b2s(tempfile));
       mutt_buffer_pool_release(&tempfile);
 
       b->goodsig = goodsig;
       b->badsig = !goodsig;
 
       /* Now display the signed body */
       state_attach_puts(s, _("[-- The following data is signed --]\n\n"));
 
       mutt_protected_headers_handler(a, s);
 
       FREE(&signatures);
     }
     else
     {
       state_attach_puts(s,
                         _("[-- Warning: Can't find any signatures. --]\n\n"));
     }
   }
 
   rc = mutt_body_handler(a, s);
 
   if ((s->flags & MUTT_DISPLAY) && (sigcnt != 0))
     state_attach_puts(s, _("\n[-- End of signed data --]\n"));
 
   return rc;
 }

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◆ crypt_cleanup()

void crypt_cleanup ( void )

Clean up backend.

Definition at line 138 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, cleanup))
     (CRYPT_MOD_CALL(PGP, cleanup))();
 
   if (CRYPT_MOD_CALL_CHECK(SMIME, cleanup))
     (CRYPT_MOD_CALL(SMIME, cleanup))();
 }

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◆ crypt_has_module_backend()

bool crypt_has_module_backend ( SecurityFlags type )

Is there a crypto backend for a given type?

Parameters

type	Crypto type, see SecurityFlags

Return values

true	Backend is present
false	Backend is not present

Definition at line 167 of file cryptglue.c.

 {
   if (((WithCrypto & APPLICATION_PGP) != 0) && (type & APPLICATION_PGP) &&
       crypto_module_lookup(APPLICATION_PGP))
   {
     return true;
   }
 
   if (((WithCrypto & APPLICATION_SMIME) != 0) && (type & APPLICATION_SMIME) &&
       crypto_module_lookup(APPLICATION_SMIME))
   {
     return true;
   }
 
   return false;
 }

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◆ crypt_init()

void crypt_init ( void )

Initialise the crypto backends.

This calls CryptModuleSpecs::init()

Definition at line 93 of file cryptglue.c.

 {
 #ifdef CRYPT_BACKEND_CLASSIC_PGP
   if (
 #ifdef CRYPT_BACKEND_GPGME
       (!C_CryptUseGpgme)
 #else
       1
 #endif
   )
     crypto_module_register(&CryptModPgpClassic);
 #endif
 
 #ifdef CRYPT_BACKEND_CLASSIC_SMIME
   if (
 #ifdef CRYPT_BACKEND_GPGME
       (!C_CryptUseGpgme)
 #else
       1
 #endif
   )
     crypto_module_register(&CryptModSmimeClassic);
 #endif
 
 #ifdef CRYPT_BACKEND_GPGME
   if (C_CryptUseGpgme)
   {
     crypto_module_register(&CryptModPgpGpgme);
     crypto_module_register(&CryptModSmimeGpgme);
   }
 #endif
 
 #if defined(CRYPT_BACKEND_CLASSIC_PGP) ||                                      \
     defined(CRYPT_BACKEND_CLASSIC_SMIME) || defined(CRYPT_BACKEND_GPGME)
   if (CRYPT_MOD_CALL_CHECK(PGP, init))
     CRYPT_MOD_CALL(PGP, init)();
 
   if (CRYPT_MOD_CALL_CHECK(SMIME, init))
     CRYPT_MOD_CALL(SMIME, init)();
 #endif
 }

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◆ crypt_invoke_message()

void crypt_invoke_message ( SecurityFlags type )

Display an informative message.

Parameters

type	Crypto type, see SecurityFlags

Show a message that a backend will be invoked.

Definition at line 153 of file cryptglue.c.

 {
   if (((WithCrypto & APPLICATION_PGP) != 0) && (type & APPLICATION_PGP))
     mutt_message(_("Invoking PGP..."));
   else if (((WithCrypto & APPLICATION_SMIME) != 0) && (type & APPLICATION_SMIME))
     mutt_message(_("Invoking S/MIME..."));
 }

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◆ crypt_pgp_application_handler()

int crypt_pgp_application_handler	(	struct Body *	m,
		struct State *	s
	)

Wrapper for CryptModuleSpecs::application_handler()

Implements handler_t

Definition at line 234 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, application_handler))
     return CRYPT_MOD_CALL(PGP, application_handler)(m, s);
 
   return -1;
 }

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◆ crypt_pgp_check_traditional()

int crypt_pgp_check_traditional	(	FILE *	fp,
		struct Body *	b,
		bool	just_one
	)

Wrapper for CryptModuleSpecs::pgp_check_traditional()

Definition at line 281 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, pgp_check_traditional))
     return CRYPT_MOD_CALL(PGP, pgp_check_traditional)(fp, b, just_one);
 
   return 0;
 }

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◆ crypt_pgp_decrypt_mime()

int crypt_pgp_decrypt_mime	(	FILE *	fp_in,
		FILE **	fp_out,
		struct Body *	b,
		struct Body **	cur
	)

Wrapper for CryptModuleSpecs::decrypt_mime()

Definition at line 207 of file cryptglue.c.

 {
 #ifdef USE_AUTOCRYPT
   if (C_Autocrypt)
   {
     OptAutocryptGpgme = true;
     int result = pgp_gpgme_decrypt_mime(fp_in, fp_out, b, cur);
     OptAutocryptGpgme = false;
     if (result == 0)
     {
       b->is_autocrypt = true;
       return result;
     }
   }
 #endif
 
   if (CRYPT_MOD_CALL_CHECK(PGP, decrypt_mime))
     return CRYPT_MOD_CALL(PGP, decrypt_mime)(fp_in, fp_out, b, cur);
 
   return -1;
 }

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◆ crypt_pgp_encrypted_handler()

int crypt_pgp_encrypted_handler	(	struct Body *	a,
		struct State *	s
	)

Wrapper for CryptModuleSpecs::encrypted_handler()

Implements handler_t

Definition at line 247 of file cryptglue.c.

 {
 #ifdef USE_AUTOCRYPT
   if (C_Autocrypt)
   {
     OptAutocryptGpgme = true;
     int result = pgp_gpgme_encrypted_handler(a, s);
     OptAutocryptGpgme = false;
     if (result == 0)
     {
       a->is_autocrypt = true;
       return result;
     }
   }
 #endif
 
   if (CRYPT_MOD_CALL_CHECK(PGP, encrypted_handler))
     return CRYPT_MOD_CALL(PGP, encrypted_handler)(a, s);
 
   return -1;
 }

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◆ crypt_pgp_extract_key_from_attachment()

void crypt_pgp_extract_key_from_attachment	(	FILE *	fp,
		struct Body *	top
	)

Wrapper for CryptModuleSpecs::pgp_extract_key_from_attachment()

Definition at line 393 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, pgp_extract_key_from_attachment))
     CRYPT_MOD_CALL(PGP, pgp_extract_key_from_attachment)(fp, top);
 }

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◆ crypt_pgp_invoke_getkeys()

void crypt_pgp_invoke_getkeys ( struct Address * addr )

Wrapper for CryptModuleSpecs::pgp_invoke_getkeys()

Definition at line 272 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, pgp_invoke_getkeys))
     CRYPT_MOD_CALL(PGP, pgp_invoke_getkeys)(addr);
 }

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◆ crypt_pgp_make_key_attachment()

struct Body* crypt_pgp_make_key_attachment ( void )

Wrapper for CryptModuleSpecs::pgp_make_key_attachment()

Definition at line 303 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, pgp_make_key_attachment))
     return CRYPT_MOD_CALL(PGP, pgp_make_key_attachment)();
 
   return NULL;
 }

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◆ crypt_pgp_send_menu()

int crypt_pgp_send_menu ( struct Email * e )

Wrapper for CryptModuleSpecs::send_menu()

Definition at line 382 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(PGP, send_menu))
     return CRYPT_MOD_CALL(PGP, send_menu)(e);
 
   return 0;
 }

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◆ crypt_smime_application_handler()

int crypt_smime_application_handler	(	struct Body *	m,
		struct State *	s
	)

Wrapper for CryptModuleSpecs::application_handler()

Implements handler_t

Definition at line 444 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(SMIME, application_handler))
     return CRYPT_MOD_CALL(SMIME, application_handler)(m, s);
 
   return -1;
 }

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◆ crypt_smime_decrypt_mime()

int crypt_smime_decrypt_mime	(	FILE *	fp_in,
		FILE **	fp_out,
		struct Body *	b,
		struct Body **	cur
	)

Wrapper for CryptModuleSpecs::decrypt_mime()

Definition at line 431 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(SMIME, decrypt_mime))
     return CRYPT_MOD_CALL(SMIME, decrypt_mime)(fp_in, fp_out, b, cur);
 
   return -1;
 }

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◆ crypt_smime_getkeys()

void crypt_smime_getkeys ( struct Envelope * env )

Wrapper for CryptModuleSpecs::smime_getkeys()

Definition at line 455 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(SMIME, smime_getkeys))
     CRYPT_MOD_CALL(SMIME, smime_getkeys)(env);
 }

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◆ crypt_smime_send_menu()

int crypt_smime_send_menu ( struct Email * e )

Wrapper for CryptModuleSpecs::send_menu()

Definition at line 528 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(SMIME, send_menu))
     return CRYPT_MOD_CALL(SMIME, send_menu)(e);
 
   return 0;
 }

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◆ crypt_smime_verify_sender()

int crypt_smime_verify_sender	(	struct Mailbox *	m,
		struct Email *	e
	)

Wrapper for CryptModuleSpecs::smime_verify_sender()

Definition at line 464 of file cryptglue.c.

 {
   if (CRYPT_MOD_CALL_CHECK(SMIME, smime_verify_sender))
     return CRYPT_MOD_CALL(SMIME, smime_verify_sender)(m, e);
 
   return 1;
 }

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◆ crypto_module_free()

void crypto_module_free ( void )

Clean up the crypto modules.

Definition at line 81 of file crypt_mod.c.

 {
   struct CryptModule *np = NULL, *tmp = NULL;
   STAILQ_FOREACH_SAFE(np, &CryptModules, entries, tmp)
   {
     STAILQ_REMOVE(&CryptModules, np, CryptModule, entries);
     FREE(&np);
   }
 }

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◆ pgp_gpgme_init()

void pgp_gpgme_init ( void )

Implements CryptModuleSpecs::init()

Definition at line 4130 of file crypt_gpgme.c.

 {
   init_common();
   init_pgp();
 }

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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 3942 of file crypt_gpgme.c.

 {
   int rc = -1, junk;
   gpgme_error_t err;
   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)))
   {
     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, sizeof(*k));
       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_select_gpgme_key(results, NULL, "*", APPLICATION_PGP, &junk);
   if (!(choice && choice->kobj && choice->kobj->subkeys && choice->kobj->subkeys->fpr))
     goto cleanup;
   mutt_buffer_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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◆ mutt_gpgme_print_version()

const char* mutt_gpgme_print_version ( void )

Get version of GPGME.

Return values

ptr	GPGME version string

Definition at line 4425 of file crypt_gpgme.c.

 {
   return GPGME_VERSION;
 }

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Variable Documentation

◆ C_CryptOpportunisticEncrypt

bool C_CryptOpportunisticEncrypt

Config: Enable encryption when the recipient's key is available.

Definition at line 41 of file config.c.

◆ C_CryptProtectedHeadersRead

bool C_CryptProtectedHeadersRead

Config: Display protected headers (Memory Hole) in the pager.

Definition at line 43 of file config.c.

◆ C_CryptProtectedHeadersSave

bool C_CryptProtectedHeadersSave

Config: Save the cleartext Subject with the headers.

Definition at line 44 of file config.c.

◆ C_CryptVerifySig

unsigned char C_CryptVerifySig

Config: Verify PGP or SMIME signatures.

Definition at line 108 of file config.c.

◆ C_PgpAutoDecode

bool C_PgpAutoDecode

Config: Automatically decrypt PGP messages.

Definition at line 107 of file config.c.

◆ C_PgpSignAs

char* C_PgpSignAs

Config: Use this alternative key for signing messages.

Definition at line 52 of file config.c.

◆ C_SmimeEncryptWith

char* C_SmimeEncryptWith

Config: Algorithm for encryption.

Definition at line 56 of file config.c.

◆ C_SmimeIsDefault

bool C_SmimeIsDefault

Config: Use SMIME rather than PGP by default.

Definition at line 46 of file config.c.

◆ C_SmimeSignAs

char* C_SmimeSignAs

Config: Use this alternative key for signing messages.

Definition at line 55 of file config.c.

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ SEC_NO_FLAGS

◆ SEC_ENCRYPT

◆ SEC_SIGN

◆ SEC_GOODSIGN

◆ SEC_BADSIGN

◆ SEC_PARTSIGN

◆ SEC_SIGNOPAQUE

◆ SEC_KEYBLOCK

◆ SEC_INLINE

◆ SEC_OPPENCRYPT

◆ SEC_AUTOCRYPT

◆ SEC_AUTOCRYPT_OVERRIDE

◆ APPLICATION_PGP

◆ APPLICATION_SMIME

◆ PGP_TRADITIONAL_CHECKED

◆ SEC_ALL_FLAGS

◆ PGP_ENCRYPT

◆ PGP_SIGN

◆ PGP_GOODSIGN

◆ PGP_KEY

◆ PGP_INLINE

◆ SMIME_ENCRYPT

◆ SMIME_SIGN

◆ SMIME_GOODSIGN

◆ SMIME_BADSIGN

◆ SMIME_OPAQUE

◆ WithCrypto

◆ KEYFLAG_NO_FLAGS

◆ KEYFLAG_CANSIGN

◆ KEYFLAG_CANENCRYPT

◆ KEYFLAG_ISX509

◆ KEYFLAG_SECRET

◆ KEYFLAG_EXPIRED

◆ KEYFLAG_REVOKED

◆ KEYFLAG_DISABLED

◆ KEYFLAG_SUBKEY

◆ KEYFLAG_CRITICAL

◆ KEYFLAG_PREFER_ENCRYPTION

◆ KEYFLAG_PREFER_SIGNING

◆ KEYFLAG_CANTUSE

◆ KEYFLAG_RESTRICTIONS

◆ KEYFLAG_ABILITIES

Typedef Documentation

◆ SecurityFlags

◆ KeyFlags

Function Documentation

◆ crypt_extract_keys_from_messages()

◆ crypt_forget_passphrase()

◆ crypt_get_keys()

◆ crypt_opportunistic_encrypt()

◆ crypt_query()

◆ crypt_valid_passphrase()

◆ mutt_is_application_pgp()

◆ mutt_is_application_smime()

◆ mutt_is_malformed_multipart_pgp_encrypted()

◆ mutt_is_multipart_encrypted()

◆ mutt_is_multipart_signed()

◆ mutt_is_valid_multipart_pgp_encrypted()

◆ mutt_protect()

◆ mutt_protected_headers_handler()

◆ mutt_should_hide_protected_subject()

◆ mutt_signed_handler()

◆ crypt_cleanup()

◆ crypt_has_module_backend()

◆ crypt_init()

◆ crypt_invoke_message()

◆ crypt_pgp_application_handler()

◆ crypt_pgp_check_traditional()

◆ crypt_pgp_decrypt_mime()

◆ crypt_pgp_encrypted_handler()

◆ crypt_pgp_extract_key_from_attachment()

◆ crypt_pgp_invoke_getkeys()

◆ crypt_pgp_make_key_attachment()

◆ crypt_pgp_send_menu()