pgpkey.c File Reference

PGP key management routines. More...

#include "config.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.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 "mutt.h"
#include "pgpkey.h"
#include "lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "send/lib.h"
#include "crypt.h"
#include "globals.h"
#include "gnupgparse.h"
#include "mutt_logging.h"
#include "pgpinvoke.h"
#include "pgp.h"
#include "pgplib.h"

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Data Structures
struct	PgpCache
	List of cached PGP keys. More...

Macros
#define	PGP_KV_NO_FLAGS   0
	No flags are set.
#define	PGP_KV_VALID   (1 << 0)
	PGP Key ID is valid.
#define	PGP_KV_ADDR   (1 << 1)
	PGP Key address is valid.
#define	PGP_KV_STRING   (1 << 2)
	PGP Key name string is valid.
#define	PGP_KV_STRONGID   (1 << 3)
	PGP Key is strong.
#define	PGP_KV_MATCH   (PGP_KV_ADDR | PGP_KV_STRING)

Typedefs
typedef uint8_t	PgpKeyValidFlags
	Flags for valid Pgp Key fields, e.g. PGP_KV_VALID.

Functions
struct PgpKeyInfo *	pgp_principal_key (struct PgpKeyInfo *key)
	Get the main (parent) PGP key.
bool	pgp_key_is_valid (struct PgpKeyInfo *k)
	Is a PGP key valid?
bool	pgp_keys_are_valid (struct PgpKeyInfo *keys)
	Are all these PGP keys valid?
bool	pgp_id_is_strong (struct PgpUid *uid)
	Is a PGP key strong?
bool	pgp_id_is_valid (struct PgpUid *uid)
	Is a PGP key valid.
static PgpKeyValidFlags	pgp_id_matches_addr (struct Address *addr, struct Address *u_addr, struct PgpUid *uid)
	Does the key ID match the address.
struct PgpKeyInfo *	pgp_ask_for_key (char *tag, const char *whatfor, KeyFlags abilities, enum PgpRing keyring)
	Ask the user for a PGP key.
struct Body *	pgp_class_make_key_attachment (void)
	Generate a public key attachment - Implements CryptModuleSpecs::pgp_make_key_attachment() -.
static void	pgp_add_string_to_hints (const char *str, struct ListHead *hints)
	Split a string and add the parts to a List.
static struct PgpKeyInfo **	pgp_get_lastp (struct PgpKeyInfo *p)
	Get the last PGP key in a list.
struct PgpKeyInfo *	pgp_getkeybyaddr (struct Address *a, KeyFlags abilities, enum PgpRing keyring, bool oppenc_mode)
	Find a PGP key by address.
struct PgpKeyInfo *	pgp_getkeybystr (const char *cp, KeyFlags abilities, enum PgpRing keyring)
	Find a PGP key by string.

Variables
static struct PgpCache *	IdDefaults = NULL
	Cache of GPGME keys.

Detailed Description

PGP key management routines.

Authors

• Thomas Roessler
• Pietro Cerutti
• Richard Russon
• 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 pgpkey.c.

Macro Definition Documentation

PGP_KV_NO_FLAGS

#define PGP_KV_NO_FLAGS   0

No flags are set.

Definition at line 78 of file pgpkey.c.

PGP_KV_VALID

#define PGP_KV_VALID   (1 << 0)

PGP Key ID is valid.

Definition at line 79 of file pgpkey.c.

PGP_KV_ADDR

#define PGP_KV_ADDR   (1 << 1)

PGP Key address is valid.

Definition at line 80 of file pgpkey.c.

PGP_KV_STRING

#define PGP_KV_STRING   (1 << 2)

PGP Key name string is valid.

Definition at line 81 of file pgpkey.c.

PGP_KV_STRONGID

#define PGP_KV_STRONGID   (1 << 3)

PGP Key is strong.

Definition at line 82 of file pgpkey.c.

PGP_KV_MATCH

#define PGP_KV_MATCH   (PGP_KV_ADDR | PGP_KV_STRING)

Definition at line 85 of file pgpkey.c.

Typedef Documentation

PgpKeyValidFlags

typedef uint8_t PgpKeyValidFlags

Flags for valid Pgp Key fields, e.g. PGP_KV_VALID.

Definition at line 77 of file pgpkey.c.

Function Documentation

pgp_principal_key()

struct PgpKeyInfo * pgp_principal_key

(

struct PgpKeyInfo *

key

)

Get the main (parent) PGP key.

Parameters

key	Key to start with

Return values

ptr

PGP Key

Definition at line 92 of file pgpkey.c.

{
  if (key->flags & KEYFLAG_SUBKEY && key->parent)
    return key->parent;
  return key;
}

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pgp_key_is_valid()

bool pgp_key_is_valid

(

struct PgpKeyInfo *

k

)

Is a PGP key valid?

Parameters

k	Key to examine

Return values

true	Key is valid

Definition at line 104 of file pgpkey.c.

{
  struct PgpKeyInfo *pk = pgp_principal_key(k);
  if (k->flags & KEYFLAG_CANTUSE)
    return false;
  if (pk->flags & KEYFLAG_CANTUSE)
    return false;
 
  return true;
}

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pgp_keys_are_valid()

bool pgp_keys_are_valid

(

struct PgpKeyInfo *

keys

)

Are all these PGP keys valid?

Parameters

keys	Set of keys to examine

Return values

true	All keys are valid

Definition at line 120 of file pgpkey.c.

{
  for (struct PgpKeyInfo *k = keys; k != NULL; k = k->next)
  {
    if (!pgp_key_is_valid(k))
      return false;
  }
 
  return true;
}

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pgp_id_is_strong()

bool pgp_id_is_strong

(

struct PgpUid *

uid

)

Is a PGP key strong?

Parameters

uid	UID of a PGP key

Return values

true	Key is strong

Definition at line 136 of file pgpkey.c.

{
  if ((uid->trust & 3) < 3)
    return false;
  /* else */
  return true;
}

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pgp_id_is_valid()

bool pgp_id_is_valid

(

struct PgpUid *

uid

)

Is a PGP key valid.

Parameters

uid	UID of a PGP key

Return values

true	Key is valid

Definition at line 149 of file pgpkey.c.

{
  if (!pgp_key_is_valid(uid->parent))
    return false;
  if (uid->flags & KEYFLAG_CANTUSE)
    return false;
  /* else */
  return true;
}

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pgp_id_matches_addr()

static PgpKeyValidFlags pgp_id_matches_addr ( struct Address *  addr, struct Address *  u_addr, struct PgpUid *  uid  )

static

Does the key ID match the address.

Parameters

addr	First email address
u_addr	Second email address
uid	UID of PGP key

Return values

num	Flags, e.g. PGP_KV_VALID

Definition at line 166 of file pgpkey.c.

{
  PgpKeyValidFlags flags = PGP_KV_NO_FLAGS;
 
  if (pgp_id_is_valid(uid))
    flags |= PGP_KV_VALID;
 
  if (pgp_id_is_strong(uid))
    flags |= PGP_KV_STRONGID;
 
  if (addr->mailbox && u_addr->mailbox && buf_istr_equal(addr->mailbox, u_addr->mailbox))
  {
    flags |= PGP_KV_ADDR;
  }
 
  if (addr->personal && u_addr->personal &&
      buf_istr_equal(addr->personal, u_addr->personal))
  {
    flags |= PGP_KV_STRING;
  }
 
  return flags;
}

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pgp_ask_for_key()

struct PgpKeyInfo * pgp_ask_for_key	(	char *	tag,
		const char *	whatfor,
		KeyFlags	abilities,
		enum PgpRing	keyring
	)

Ask the user for a PGP key.

Parameters

tag	Prompt for the user
whatfor	Use for key, e.g. "signing"
abilities	Abilities to match, see KeyFlags
keyring	PGP keyring to use

Return values

ptr	Selected PGP key

Definition at line 199 of file pgpkey.c.

{
  struct PgpKeyInfo *key = NULL;
  struct PgpCache *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 PgpCache);
        l->next = IdDefaults;
        IdDefaults = l;
        l->what = mutt_str_dup(whatfor);
        l->dflt = buf_strdup(resp);
      }
    }
 
    key = pgp_getkeybystr(buf_string(resp), abilities, keyring);
    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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pgp_add_string_to_hints()

static void pgp_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.

Definition at line 339 of file pgpkey.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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pgp_get_lastp()

static struct PgpKeyInfo ** pgp_get_lastp ( struct PgpKeyInfo *  p )

static

Get the last PGP key in a list.

Parameters

p	List of PGP keys

Return values

ptr	Last PGP key in list

Definition at line 359 of file pgpkey.c.

{
  for (; p; p = p->next)
    if (!p->next)
      return &p->next;
 
  return NULL;
}

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pgp_getkeybyaddr()

struct PgpKeyInfo * pgp_getkeybyaddr	(	struct Address *	a,
		KeyFlags	abilities,
		enum PgpRing	keyring,
		bool	oppenc_mode
	)

Find a PGP key by address.

Parameters

a	Email address to match
abilities	Abilities to match, see KeyFlags
keyring	PGP keyring to use
oppenc_mode	If true, use opportunistic encryption

Return values

ptr	Matching PGP key

Definition at line 376 of file pgpkey.c.

{
  if (!a)
    return NULL;
 
  struct ListHead hints = STAILQ_HEAD_INITIALIZER(hints);
 
  bool multi = false;
 
  struct PgpKeyInfo *keys = NULL, *k = NULL, *kn = NULL;
  struct PgpKeyInfo *the_strong_valid_key = NULL;
  struct PgpKeyInfo *a_valid_addrmatch_key = NULL;
  struct PgpKeyInfo *matches = NULL;
  struct PgpKeyInfo **last = &matches;
  struct PgpUid *q = NULL;
 
  if (a->mailbox)
    mutt_list_insert_tail(&hints, buf_strdup(a->mailbox));
  if (a->personal)
    pgp_add_string_to_hints(buf_string(a->personal), &hints);
 
  if (!oppenc_mode)
    mutt_message(_("Looking for keys matching \"%s\"..."), buf_string(a->mailbox));
  keys = pgp_get_candidates(keyring, &hints);
 
  mutt_list_free(&hints);
 
  if (!keys)
    return NULL;
 
  mutt_debug(LL_DEBUG5, "looking for %s <%s>\n", buf_string(a->personal),
             buf_string(a->mailbox));
 
  for (k = keys; k; k = kn)
  {
    kn = k->next;
 
    mutt_debug(LL_DEBUG5, "  looking at key: %s\n", pgp_keyid(k));
 
    if (abilities && !(k->flags & abilities))
    {
      mutt_debug(LL_DEBUG3, "  insufficient abilities: Has %x, want %x\n", k->flags, abilities);
      continue;
    }
 
    bool match = false; /* any match */
 
    for (q = k->address; q; q = q->next)
    {
      struct AddressList al = TAILQ_HEAD_INITIALIZER(al);
      mutt_addrlist_parse(&al, NONULL(q->addr));
      struct Address *qa = NULL;
      TAILQ_FOREACH(qa, &al, entries)
      {
        PgpKeyValidFlags validity = pgp_id_matches_addr(a, qa, q);
 
        if (validity & PGP_KV_MATCH) /* something matches */
          match = true;
 
        if ((validity & PGP_KV_VALID) && (validity & PGP_KV_ADDR))
        {
          if (validity & PGP_KV_STRONGID)
          {
            if (the_strong_valid_key && (the_strong_valid_key != k))
              multi = true;
            the_strong_valid_key = k;
          }
          else
          {
            a_valid_addrmatch_key = k;
          }
        }
      }
 
      mutt_addrlist_clear(&al);
    }
 
    if (match)
    {
      *last = pgp_principal_key(k);
      kn = pgp_remove_key(&keys, *last);
      last = pgp_get_lastp(k);
    }
  }
 
  pgp_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)
      {
        pgp_remove_key(&matches, the_strong_valid_key);
        k = the_strong_valid_key;
      }
      else if (a_valid_addrmatch_key && !c_crypt_opportunistic_encrypt_strong_keys)
      {
        pgp_remove_key(&matches, a_valid_addrmatch_key);
        k = 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.  */
      pgp_remove_key(&matches, the_strong_valid_key);
      k = the_strong_valid_key;
    }
    else
    {
      /* Else: Ask the user.  */
      k = dlg_pgp(matches, a, NULL);
      if (k)
        pgp_remove_key(&matches, k);
    }
 
    pgp_key_free(&matches);
 
    return k;
  }
 
  return NULL;
}

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pgp_getkeybystr()

struct PgpKeyInfo * pgp_getkeybystr	(	const char *	cp,
		KeyFlags	abilities,
		enum PgpRing	keyring
	)

Find a PGP key by string.

Parameters

cp	String to match, can be empty but cannot be NULL
abilities	Abilities to match, see KeyFlags
keyring	PGP keyring to use

Return values

ptr	Matching PGP key

Definition at line 515 of file pgpkey.c.

{
  struct ListHead hints = STAILQ_HEAD_INITIALIZER(hints);
  struct PgpKeyInfo *keys = NULL;
  struct PgpKeyInfo *matches = NULL;
  struct PgpKeyInfo **last = &matches;
  struct PgpKeyInfo *k = NULL, *kn = NULL;
  struct PgpUid *a = NULL;
  size_t l;
  const char *ps = NULL, *pl = NULL, *pfcopy = NULL, *phint = NULL;
 
  char *p = strdup(cp); // mutt_str_dup converts "" into NULL, see #1809
  l = mutt_str_len(p);
  if ((l > 0) && (p[l - 1] == '!'))
    p[l - 1] = 0;
 
  mutt_message(_("Looking for keys matching \"%s\"..."), p);
 
  pfcopy = crypt_get_fingerprint_or_id(p, &phint, &pl, &ps);
  pgp_add_string_to_hints(phint, &hints);
  keys = pgp_get_candidates(keyring, &hints);
  mutt_list_free(&hints);
 
  for (k = keys; k; k = kn)
  {
    kn = k->next;
    if (abilities && !(k->flags & abilities))
      continue;
 
    /* This shouldn't happen, but keys without any addresses aren't selectable
     * in dlg_pgp().  */
    if (!k->address)
      continue;
 
    bool match = false;
 
    mutt_debug(LL_DEBUG5, "matching \"%s\" against key %s:\n", p, pgp_long_keyid(k));
 
    if ((*p == '\0') || (pfcopy && mutt_istr_equal(pfcopy, k->fingerprint)) ||
        (pl && mutt_istr_equal(pl, pgp_long_keyid(k))) ||
        (ps && mutt_istr_equal(ps, pgp_short_keyid(k))))
    {
      mutt_debug(LL_DEBUG5, "        match #1\n");
      match = true;
    }
    else
    {
      for (a = k->address; a; a = a->next)
      {
        mutt_debug(LL_DEBUG5, "matching \"%s\" against key %s, \"%s\":\n", p,
                   pgp_long_keyid(k), NONULL(a->addr));
        if (mutt_istr_find(a->addr, p))
        {
          mutt_debug(LL_DEBUG5, "        match #2\n");
          match = true;
          break;
        }
      }
    }
 
    if (match)
    {
      *last = pgp_principal_key(k);
      kn = pgp_remove_key(&keys, *last);
      last = pgp_get_lastp(k);
    }
  }
 
  pgp_key_free(&keys);
 
  k = NULL;
  if (matches)
  {
    if (isatty(STDIN_FILENO))
    {
      k = dlg_pgp(matches, NULL, p);
      if (k)
        pgp_remove_key(&matches, k);
      pgp_key_free(&matches);
    }
    else if (pgp_keys_are_valid(matches))
    {
      k = matches;
    }
    else
    {
      mutt_error(_("A key can't be used: expired/disabled/revoked"));
    }
  }
 
  FREE(&pfcopy);
  FREE(&p);
  return k;
}

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Variable Documentation

IdDefaults

struct PgpCache* IdDefaults = NULL

static

Cache of GPGME keys.

Definition at line 74 of file pgpkey.c.