NeoMutt  2022-04-29-247-gc6aae8
Teaching an old dog new tricks
DOXYGEN
crypt.c File Reference

Signing/encryption multiplexor. More...

#include "config.h"
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.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.h"
#include "lib.h"
#include "attach/lib.h"
#include "question/lib.h"
#include "send/lib.h"
#include "copy.h"
#include "cryptglue.h"
#include "handler.h"
#include "muttlib.h"
#include "mx.h"
#include "options.h"
#include "autocrypt/lib.h"
+ Include dependency graph for crypt.c:

Go to the source code of this file.

Functions

void crypt_current_time (struct State *s, const char *app_name)
 Print the current time. More...
 
void crypt_forget_passphrase (void)
 Forget a passphrase and display a message. More...
 
bool crypt_valid_passphrase (SecurityFlags flags)
 Check that we have a usable passphrase, ask if not. More...
 
int mutt_protect (struct Email *e, char *keylist, bool postpone)
 Encrypt and/or sign a message. More...
 
SecurityFlags mutt_is_multipart_signed (struct Body *b)
 Is a message signed? More...
 
SecurityFlags mutt_is_multipart_encrypted (struct Body *b)
 Does the message have encrypted parts? More...
 
int mutt_is_valid_multipart_pgp_encrypted (struct Body *b)
 Is this a valid multi-part encrypted message? More...
 
SecurityFlags mutt_is_malformed_multipart_pgp_encrypted (struct Body *b)
 Check for malformed layout. More...
 
SecurityFlags mutt_is_application_pgp (struct Body *b)
 Does the message use PGP? More...
 
SecurityFlags mutt_is_application_smime (struct Body *b)
 Does the message use S/MIME? More...
 
SecurityFlags crypt_query (struct Body *b)
 Check out the type of encryption used. More...
 
int crypt_write_signed (struct Body *a, struct State *s, const char *tempfile)
 Write the message body/part. More...
 
void crypt_convert_to_7bit (struct Body *a)
 Convert an email to 7bit encoding. More...
 
void crypt_extract_keys_from_messages (struct Mailbox *m, struct EmailList *el)
 Extract keys from 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...
 
static void crypt_fetch_signatures (struct Body ***signatures, struct Body *a, int *n)
 Create an array of an emails parts. More...
 
bool mutt_should_hide_protected_subject (struct Email *e)
 Should NeoMutt hide the protected subject? More...
 
int mutt_protected_headers_handler (struct Body *b, struct State *s)
 Process a protected header - Implements handler_t -. More...
 
int mutt_signed_handler (struct Body *b, struct State *s)
 Verify a "multipart/signed" body - Implements handler_t -. More...
 
const char * crypt_get_fingerprint_or_id (const char *p, const char **pphint, const char **ppl, const char **pps)
 Get the fingerprint or long key ID. More...
 
bool crypt_is_numerical_keyid (const char *s)
 Is this a numerical keyid. More...
 

Detailed Description

Signing/encryption multiplexor.

Authors
  • Michael R. Elkins
  • Thomas Roessler
  • Thomas Roessler
  • Oliver Ehli
  • Werner Koch
  • g10code GmbH
  • Pietro Cerutti

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.c.

Function Documentation

◆ crypt_current_time()

void crypt_current_time ( struct State s,
const char *  app_name 
)

Print the current time.

Parameters
sState to use
app_nameApp name, e.g. "PGP"

print the current time to avoid spoofing of the signature output

Definition at line 70 of file crypt.c.

71{
72 char p[256], tmp[256];
73
74 if (!WithCrypto)
75 return;
76
77 const bool c_crypt_timestamp = cs_subset_bool(NeoMutt->sub, "crypt_timestamp");
78 if (c_crypt_timestamp)
79 {
80 mutt_date_localtime_format(p, sizeof(p), _(" (current time: %c)"), MUTT_DATE_NOW);
81 }
82 else
83 *p = '\0';
84
85 snprintf(tmp, sizeof(tmp), _("[-- %s output follows%s --]\n"), NONULL(app_name), p);
86 state_attach_puts(s, tmp);
87}
bool cs_subset_bool(const struct ConfigSubset *sub, const char *name)
Get a boolean config item by name.
Definition: helpers.c:73
size_t mutt_date_localtime_format(char *buf, size_t buflen, const char *format, time_t t)
Format localtime.
Definition: date.c:692
#define MUTT_DATE_NOW
Constant representing the 'current time', see: mutt_date_gmtime(), mutt_date_localtime()
Definition: date.h:39
#define _(a)
Definition: message.h:28
void state_attach_puts(struct State *s, const char *t)
Write a string to the state.
Definition: state.c:100
#define WithCrypto
Definition: lib.h:116
#define NONULL(x)
Definition: string2.h:37
Container for Accounts, Notifications.
Definition: neomutt.h:37
struct ConfigSubset * sub
Inherited config items.
Definition: neomutt.h:39
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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.

93{
96
99
100 if (WithCrypto)
101 {
102 /* L10N: Due to the implementation details (e.g. some passwords are managed
103 by gpg-agent) we can't know whether we forgot zero, 1, 12, ...
104 passwords. So in English we use "Passphrases". Your language might
105 have other means to express this. */
106 mutt_message(_("Passphrases forgotten"));
107 }
108}
void crypt_smime_void_passphrase(void)
Wrapper for CryptModuleSpecs::void_passphrase()
Definition: cryptglue.c:413
void crypt_pgp_void_passphrase(void)
Wrapper for CryptModuleSpecs::void_passphrase()
Definition: cryptglue.c:191
#define mutt_message(...)
Definition: logging.h:86
#define APPLICATION_PGP
Use PGP to encrypt/sign.
Definition: lib.h:90
#define APPLICATION_SMIME
Use SMIME to encrypt/sign.
Definition: lib.h:91
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◆ crypt_valid_passphrase()

bool crypt_valid_passphrase ( SecurityFlags  flags)

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

Parameters
flagsFlags, see SecurityFlags
Return values
trueSuccess
falseFailed

Definition at line 134 of file crypt.c.

135{
136 bool rc = false;
137
138#ifndef DEBUG
139 disable_coredumps();
140#endif
141
142 if (((WithCrypto & APPLICATION_PGP) != 0) && (flags & APPLICATION_PGP))
144
145 if (((WithCrypto & APPLICATION_SMIME) != 0) && (flags & APPLICATION_SMIME))
147
148 return rc;
149}
bool crypt_smime_valid_passphrase(void)
Wrapper for CryptModuleSpecs::valid_passphrase()
Definition: cryptglue.c:422
bool crypt_pgp_valid_passphrase(void)
Wrapper for CryptModuleSpecs::valid_passphrase()
Definition: cryptglue.c:200
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◆ mutt_protect()

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

Encrypt and/or sign a message.

Parameters
eEmail
keylistList of keys to encrypt to (space-separated)
postponeWhen true, signing is automatically disabled
Return values
0Success
-1Error

Definition at line 159 of file crypt.c.

160{
161 struct Body *pbody = NULL, *tmp_pbody = NULL;
162 struct Body *tmp_smime_pbody = NULL;
163 struct Body *tmp_pgp_pbody = NULL;
164 bool has_retainable_sig = false;
165
166 if (!WithCrypto)
167 return -1;
168
169 SecurityFlags security = e->security;
170 int sign = security & (SEC_AUTOCRYPT | SEC_SIGN);
171 if (postpone)
172 {
173 sign = SEC_NO_FLAGS;
174 security &= ~SEC_SIGN;
175 }
176
177 if (!(security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) && !sign)
178 return 0;
179
180 if (sign && !(security & SEC_AUTOCRYPT) && !crypt_valid_passphrase(security))
181 return -1;
182
183 if (((WithCrypto & APPLICATION_PGP) != 0) && !(security & SEC_AUTOCRYPT) &&
184 ((security & PGP_INLINE) == PGP_INLINE))
185 {
186 const enum QuadOption c_pgp_mime_auto = cs_subset_quad(NeoMutt->sub, "pgp_mime_auto");
187 if ((e->body->type != TYPE_TEXT) || !mutt_istr_equal(e->body->subtype, "plain"))
188 {
189 if (query_quadoption(c_pgp_mime_auto, _("Inline PGP can't be used with attachments. Revert to PGP/MIME?")) !=
190 MUTT_YES)
191 {
192 mutt_error(_("Mail not sent: inline PGP can't be used with attachments"));
193 return -1;
194 }
195 }
196 else if (mutt_istr_equal("flowed", mutt_param_get(&e->body->parameter, "format")))
197 {
198 if ((query_quadoption(c_pgp_mime_auto, _("Inline PGP can't be used with format=flowed. Revert to PGP/MIME?"))) !=
199 MUTT_YES)
200 {
201 mutt_error(_("Mail not sent: inline PGP can't be used with format=flowed"));
202 return -1;
203 }
204 }
205 else
206 {
207 /* they really want to send it inline... go for it */
208 if (!isendwin())
209 {
210 mutt_endwin();
211 puts(_("Invoking PGP..."));
212 }
213 pbody = crypt_pgp_traditional_encryptsign(e->body, security, keylist);
214 if (pbody)
215 {
216 e->body = pbody;
217 return 0;
218 }
219
220 /* otherwise inline won't work...ask for revert */
221 if (query_quadoption(c_pgp_mime_auto,
222 _("Message can't be sent inline. Revert to using PGP/MIME?")) != MUTT_YES)
223 {
224 mutt_error(_("Mail not sent"));
225 return -1;
226 }
227 }
228
229 /* go ahead with PGP/MIME */
230 }
231
232 if (!isendwin())
233 mutt_endwin();
234
236 tmp_smime_pbody = e->body;
238 tmp_pgp_pbody = e->body;
239
240#ifdef CRYPT_BACKEND_GPGME
241 const bool c_crypt_use_pka = cs_subset_bool(NeoMutt->sub, "crypt_use_pka");
242 if (sign && c_crypt_use_pka)
243#else
244 if (sign)
245#endif
246 {
247 /* Set sender (necessary for e.g. PKA). */
248 const char *mailbox = NULL;
249 struct Address *from = TAILQ_FIRST(&e->env->from);
250 bool free_from = false;
251
252 if (!from)
253 {
254 free_from = true;
256 }
257
258 mailbox = from->mailbox;
259 const struct Address *c_envelope_from_address = cs_subset_address(NeoMutt->sub, "envelope_from_address");
260 if (!mailbox && c_envelope_from_address)
261 mailbox = c_envelope_from_address->mailbox;
262
263 if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
265 else if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP))
267
268 if (free_from)
269 mutt_addr_free(&from);
270 }
271
272 const bool c_crypt_protected_headers_write = cs_subset_bool(NeoMutt->sub, "crypt_protected_headers_write");
273 if (c_crypt_protected_headers_write)
274 {
275 struct Envelope *protected_headers = mutt_env_new();
276 mutt_str_replace(&protected_headers->subject, e->env->subject);
277 /* Note: if other headers get added, such as to, cc, then a call to
278 * mutt_env_to_intl() will need to be added here too. */
279 mutt_prepare_envelope(protected_headers, 0, NeoMutt->sub);
280
282 e->body->mime_headers = protected_headers;
283 mutt_param_set(&e->body->parameter, "protected-headers", "v1");
284 }
285
286#ifdef USE_AUTOCRYPT
287 /* A note about e->body->mime_headers. If postpone or send
288 * fails, the mime_headers is cleared out before returning to the
289 * compose menu. So despite the "robustness" code above and in the
290 * gen_gossip_list function below, mime_headers will not be set when
291 * entering mutt_protect().
292 *
293 * This is important to note because the user could toggle
294 * $crypt_protected_headers_write or $autocrypt off back in the
295 * compose menu. We don't want mutt_write_rfc822_header() to write
296 * stale data from one option if the other is set.
297 */
298 const bool c_autocrypt = cs_subset_bool(NeoMutt->sub, "autocrypt");
299 if (c_autocrypt && !postpone && (security & SEC_AUTOCRYPT))
300 {
302 }
303#endif
304
305 if (sign)
306 {
307 if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
308 {
309 tmp_pbody = crypt_smime_sign_message(e->body, &e->env->from);
310 if (!tmp_pbody)
311 goto bail;
312 pbody = tmp_pbody;
313 tmp_smime_pbody = tmp_pbody;
314 }
315
316 const bool c_pgp_retainable_sigs = cs_subset_bool(NeoMutt->sub, "pgp_retainable_sigs");
317 if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP) &&
318 (!(security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) || c_pgp_retainable_sigs))
319 {
320 tmp_pbody = crypt_pgp_sign_message(e->body, &e->env->from);
321 if (!tmp_pbody)
322 goto bail;
323
324 has_retainable_sig = true;
325 sign = SEC_NO_FLAGS;
326 pbody = tmp_pbody;
327 tmp_pgp_pbody = tmp_pbody;
328 }
329
330 if ((WithCrypto != 0) && (security & APPLICATION_SMIME) && (security & APPLICATION_PGP))
331 {
332 /* here comes the draft ;-) */
333 }
334 }
335
336 if (security & (SEC_ENCRYPT | SEC_AUTOCRYPT))
337 {
338 if (((WithCrypto & APPLICATION_SMIME) != 0) && (security & APPLICATION_SMIME))
339 {
340 tmp_pbody = crypt_smime_build_smime_entity(tmp_smime_pbody, keylist);
341 if (!tmp_pbody)
342 {
343 /* signed ? free it! */
344 goto bail;
345 }
346 /* free tmp_body if messages was signed AND encrypted ... */
347 if ((tmp_smime_pbody != e->body) && (tmp_smime_pbody != tmp_pbody))
348 {
349 /* detach and don't delete e->body,
350 * which tmp_smime_pbody->parts after signing. */
351 tmp_smime_pbody->parts = tmp_smime_pbody->parts->next;
352 e->body->next = NULL;
353 mutt_body_free(&tmp_smime_pbody);
354 }
355 pbody = tmp_pbody;
356 }
357
358 if (((WithCrypto & APPLICATION_PGP) != 0) && (security & APPLICATION_PGP))
359 {
360 pbody = crypt_pgp_encrypt_message(e, tmp_pgp_pbody, keylist, sign, &e->env->from);
361 if (!pbody)
362 {
363 /* did we perform a retainable signature? */
364 if (has_retainable_sig)
365 {
366 /* remove the outer multipart layer */
367 tmp_pgp_pbody = mutt_remove_multipart(tmp_pgp_pbody);
368 /* get rid of the signature */
369 mutt_body_free(&tmp_pgp_pbody->next);
370 }
371
372 goto bail;
373 }
374
375 // destroy temporary signature envelope when doing retainable signatures.
376 if (has_retainable_sig)
377 {
378 tmp_pgp_pbody = mutt_remove_multipart(tmp_pgp_pbody);
379 mutt_body_free(&tmp_pgp_pbody->next);
380 }
381 }
382 }
383
384 if (pbody)
385 {
386 e->body = pbody;
387 return 0;
388 }
389
390bail:
392 mutt_param_delete(&e->body->parameter, "protected-headers");
393 return -1;
394}
void mutt_addr_free(struct Address **ptr)
Free a single Address.
Definition: address.c:440
int mutt_autocrypt_generate_gossip_list(struct Email *e)
Create the gossip list headers.
Definition: autocrypt.c:828
enum QuadOption cs_subset_quad(const struct ConfigSubset *sub, const char *name)
Get a quad-value config item by name.
Definition: helpers.c:218
const struct Address * cs_subset_address(const struct ConfigSubset *sub, const char *name)
Get an Address config item by name.
Definition: helpers.c:49
bool crypt_valid_passphrase(SecurityFlags flags)
Check that we have a usable passphrase, ask if not.
Definition: crypt.c:134
struct Body * crypt_pgp_sign_message(struct Body *a, const struct AddressList *from)
Wrapper for CryptModuleSpecs::sign_message()
Definition: cryptglue.c:327
struct Body * crypt_smime_build_smime_entity(struct Body *a, char *certlist)
Wrapper for CryptModuleSpecs::smime_build_smime_entity()
Definition: cryptglue.c:497
void crypt_pgp_set_sender(const char *sender)
Wrapper for CryptModuleSpecs::set_sender()
Definition: cryptglue.c:404
void crypt_smime_set_sender(const char *sender)
Wrapper for CryptModuleSpecs::set_sender()
Definition: cryptglue.c:539
struct Body * crypt_pgp_encrypt_message(struct Email *e, struct Body *a, char *keylist, int sign, const struct AddressList *from)
Wrapper for CryptModuleSpecs::pgp_encrypt_message()
Definition: cryptglue.c:338
struct Body * crypt_pgp_traditional_encryptsign(struct Body *a, SecurityFlags flags, char *keylist)
Wrapper for CryptModuleSpecs::pgp_traditional_encryptsign()
Definition: cryptglue.c:294
struct Body * crypt_smime_sign_message(struct Body *a, const struct AddressList *from)
Wrapper for CryptModuleSpecs::sign_message()
Definition: cryptglue.c:486
void mutt_endwin(void)
Shutdown curses.
Definition: curs_lib.c:354
void mutt_body_free(struct Body **ptr)
Free a Body.
Definition: body.c:57
void mutt_env_free(struct Envelope **ptr)
Free an Envelope.
Definition: envelope.c:97
struct Envelope * mutt_env_new(void)
Create a new Envelope.
Definition: envelope.c:43
#define mutt_error(...)
Definition: logging.h:87
@ TYPE_TEXT
Type: 'text/*'.
Definition: mime.h:38
struct Body * mutt_remove_multipart(struct Body *b)
Extract the multipart body if it exists.
Definition: multipart.c:126
bool mutt_istr_equal(const char *a, const char *b)
Compare two strings, ignoring case.
Definition: string.c:819
char * mutt_str_replace(char **p, const char *s)
Replace one string with another.
Definition: string.c:326
#define SEC_AUTOCRYPT
(Autocrypt) Message will be, or was Autocrypt encrypt+signed
Definition: lib.h:87
uint16_t SecurityFlags
Flags, e.g. SEC_ENCRYPT.
Definition: lib.h:76
#define PGP_INLINE
Definition: lib.h:100
#define SEC_NO_FLAGS
No flags are set.
Definition: lib.h:77
#define SEC_ENCRYPT
Email is encrypted.
Definition: lib.h:78
#define SEC_SIGN
Email is signed.
Definition: lib.h:79
char * mutt_param_get(const struct ParameterList *pl, const char *s)
Find a matching Parameter.
Definition: parameter.c:84
void mutt_param_delete(struct ParameterList *pl, const char *attribute)
Delete a matching Parameter.
Definition: parameter.c:142
void mutt_param_set(struct ParameterList *pl, const char *attribute, const char *value)
Set a Parameter.
Definition: parameter.c:110
QuadOption
Possible values for a quad-option.
Definition: quad.h:36
@ MUTT_YES
User answered 'Yes', or assume 'Yes'.
Definition: quad.h:39
enum QuadOption query_quadoption(enum QuadOption opt, const char *prompt)
Ask the user a quad-question.
Definition: question.c:386
#define TAILQ_FIRST(head)
Definition: queue.h:723
struct Address * mutt_default_from(struct ConfigSubset *sub)
Get a default 'from' Address.
Definition: send.c:1459
void mutt_prepare_envelope(struct Envelope *env, bool final, struct ConfigSubset *sub)
Prepare an email header.
Definition: sendlib.c:754
An email address.
Definition: address.h:36
char * mailbox
Mailbox and host address.
Definition: address.h:38
The body of an email.
Definition: body.h:36
struct Body * parts
parts of a multipart or message/rfc822
Definition: body.h:72
struct Envelope * mime_headers
Memory hole protected headers.
Definition: body.h:75
struct ParameterList parameter
Parameters of the content-type.
Definition: body.h:62
struct Body * next
next attachment in the list
Definition: body.h:71
char * subtype
content-type subtype
Definition: body.h:60
unsigned int type
content-type primary type, ContentType
Definition: body.h:40
struct Envelope * env
Envelope information.
Definition: email.h:66
SecurityFlags security
bit 0-10: flags, bit 11,12: application, bit 13: traditional pgp See: ncrypt/lib.h pgplib....
Definition: email.h:41
struct Body * body
List of MIME parts.
Definition: email.h:67
The header of an Email.
Definition: envelope.h:57
char * subject
Email's subject.
Definition: envelope.h:70
struct AddressList from
Email's 'From' list.
Definition: envelope.h:59
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◆ mutt_is_multipart_signed()

SecurityFlags mutt_is_multipart_signed ( struct Body b)

Is a message signed?

Parameters
bBody of email
Return values
numMessage is signed, see SecurityFlags
0Message is not signed (SEC_NO_FLAGS)

Definition at line 402 of file crypt.c.

403{
404 if (!b || (b->type != TYPE_MULTIPART) || !b->subtype || !mutt_istr_equal(b->subtype, "signed"))
405 {
406 return SEC_NO_FLAGS;
407 }
408
409 char *p = mutt_param_get(&b->parameter, "protocol");
410 if (!p)
411 return SEC_NO_FLAGS;
412
413 if (mutt_istr_equal(p, "multipart/mixed"))
414 return SEC_SIGN;
415
416 if (((WithCrypto & APPLICATION_PGP) != 0) && mutt_istr_equal(p, "application/pgp-signature"))
417 {
418 return PGP_SIGN;
419 }
420
421 if (((WithCrypto & APPLICATION_SMIME) != 0) && mutt_istr_equal(p, "application/x-pkcs7-signature"))
422 {
423 return SMIME_SIGN;
424 }
425 if (((WithCrypto & APPLICATION_SMIME) != 0) && mutt_istr_equal(p, "application/pkcs7-signature"))
426 {
427 return SMIME_SIGN;
428 }
429
430 return SEC_NO_FLAGS;
431}
@ TYPE_MULTIPART
Type: 'multipart/*'.
Definition: mime.h:37
#define PGP_SIGN
Definition: lib.h:97
#define SMIME_SIGN
Definition: lib.h:103
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◆ mutt_is_multipart_encrypted()

SecurityFlags mutt_is_multipart_encrypted ( struct Body b)

Does the message have encrypted parts?

Parameters
bBody of email
Return values
numMessage has got encrypted parts, see SecurityFlags
0Message hasn't got encrypted parts (SEC_NO_FLAGS)

Definition at line 439 of file crypt.c.

440{
441 if ((WithCrypto & APPLICATION_PGP) == 0)
442 return SEC_NO_FLAGS;
443
444 char *p = NULL;
445
446 if (!b || (b->type != TYPE_MULTIPART) || !b->subtype ||
447 !mutt_istr_equal(b->subtype, "encrypted") ||
448 !(p = mutt_param_get(&b->parameter, "protocol")) ||
449 !mutt_istr_equal(p, "application/pgp-encrypted"))
450 {
451 return SEC_NO_FLAGS;
452 }
453
454 return PGP_ENCRYPT;
455}
#define PGP_ENCRYPT
Definition: lib.h:96
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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
bBody of email
Return values
>0Message is valid, with encrypted parts, e.g. PGP_ENCRYPT
0Message hasn't got encrypted parts

Definition at line 463 of file crypt.c.

464{
466 return 0;
467
468 b = b->parts;
469 if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
470 !mutt_istr_equal(b->subtype, "pgp-encrypted"))
471 {
472 return 0;
473 }
474
475 b = b->next;
476 if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
477 !mutt_istr_equal(b->subtype, "octet-stream"))
478 {
479 return 0;
480 }
481
482 return PGP_ENCRYPT;
483}
SecurityFlags mutt_is_multipart_encrypted(struct Body *b)
Does the message have encrypted parts?
Definition: crypt.c:439
@ TYPE_APPLICATION
Type: 'application/*'.
Definition: mime.h:33
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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
bBody of email
Return values
numSuccess, see SecurityFlags
0Error, (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 500 of file crypt.c.

501{
503 return SEC_NO_FLAGS;
504
505 if (!b || (b->type != TYPE_MULTIPART) || !b->subtype || !mutt_istr_equal(b->subtype, "mixed"))
506 {
507 return SEC_NO_FLAGS;
508 }
509
510 b = b->parts;
511 if (!b || (b->type != TYPE_TEXT) || !b->subtype ||
512 !mutt_istr_equal(b->subtype, "plain") || (b->length != 0))
513 {
514 return SEC_NO_FLAGS;
515 }
516
517 b = b->next;
518 if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
519 !mutt_istr_equal(b->subtype, "pgp-encrypted"))
520 {
521 return SEC_NO_FLAGS;
522 }
523
524 b = b->next;
525 if (!b || (b->type != TYPE_APPLICATION) || !b->subtype ||
526 !mutt_istr_equal(b->subtype, "octet-stream"))
527 {
528 return SEC_NO_FLAGS;
529 }
530
531 b = b->next;
532 if (b)
533 return SEC_NO_FLAGS;
534
535 return PGP_ENCRYPT;
536}
LOFF_T length
length (in bytes) of attachment
Definition: body.h:53
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◆ mutt_is_application_pgp()

SecurityFlags mutt_is_application_pgp ( struct Body b)

Does the message use PGP?

Parameters
bBody of email
Return values
>0Message uses PGP, e.g. PGP_ENCRYPT
0Message doesn't use PGP, (SEC_NO_FLAGS)

Definition at line 544 of file crypt.c.

545{
547 char *p = NULL;
548
549 if (b->type == TYPE_APPLICATION)
550 {
551 if (mutt_istr_equal(b->subtype, "pgp") || mutt_istr_equal(b->subtype, "x-pgp-message"))
552 {
553 p = mutt_param_get(&b->parameter, "x-action");
554 if (p && (mutt_istr_equal(p, "sign") || mutt_istr_equal(p, "signclear")))
555 {
556 t |= PGP_SIGN;
557 }
558
559 p = mutt_param_get(&b->parameter, "format");
560 if (p && mutt_istr_equal(p, "keys-only"))
561 {
562 t |= PGP_KEY;
563 }
564
565 if (t == SEC_NO_FLAGS)
566 t |= PGP_ENCRYPT; /* not necessarily correct, but... */
567 }
568
569 if (mutt_istr_equal(b->subtype, "pgp-signed"))
570 t |= PGP_SIGN;
571
572 if (mutt_istr_equal(b->subtype, "pgp-keys"))
573 t |= PGP_KEY;
574 }
575 else if ((b->type == TYPE_TEXT) && mutt_istr_equal("plain", b->subtype))
576 {
577 if (((p = mutt_param_get(&b->parameter, "x-mutt-action")) ||
578 (p = mutt_param_get(&b->parameter, "x-action")) ||
579 (p = mutt_param_get(&b->parameter, "action"))) &&
580 mutt_istr_startswith(p, "pgp-sign"))
581 {
582 t |= PGP_SIGN;
583 }
584 else if (p && mutt_istr_startswith(p, "pgp-encrypt"))
585 t |= PGP_ENCRYPT;
586 else if (p && mutt_istr_startswith(p, "pgp-keys"))
587 t |= PGP_KEY;
588 }
589 if (t)
590 t |= PGP_INLINE;
591
592 return t;
593}
size_t mutt_istr_startswith(const char *str, const char *prefix)
Check whether a string starts with a prefix, ignoring case.
Definition: string.c:239
#define PGP_KEY
Definition: lib.h:99
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◆ mutt_is_application_smime()

SecurityFlags mutt_is_application_smime ( struct Body b)

Does the message use S/MIME?

Parameters
bBody of email
Return values
>0Message uses S/MIME, e.g. SMIME_ENCRYPT
0Message doesn't use S/MIME, (SEC_NO_FLAGS)

Definition at line 601 of file crypt.c.

602{
603 if (!b)
604 return SEC_NO_FLAGS;
605
606 if (((b->type & TYPE_APPLICATION) == 0) || !b->subtype)
607 return SEC_NO_FLAGS;
608
609 char *t = NULL;
610 bool complain = false;
611 /* S/MIME MIME types don't need x- anymore, see RFC2311 */
612 if (mutt_istr_equal(b->subtype, "x-pkcs7-mime") || mutt_istr_equal(b->subtype, "pkcs7-mime"))
613 {
614 t = mutt_param_get(&b->parameter, "smime-type");
615 if (t)
616 {
617 if (mutt_istr_equal(t, "enveloped-data"))
618 return SMIME_ENCRYPT;
619 if (mutt_istr_equal(t, "signed-data"))
620 return SMIME_SIGN | SMIME_OPAQUE;
621 return SEC_NO_FLAGS;
622 }
623 /* Netscape 4.7 uses
624 * Content-Description: S/MIME Encrypted Message
625 * instead of Content-Type parameter */
626 if (mutt_istr_equal(b->description, "S/MIME Encrypted Message"))
627 return SMIME_ENCRYPT;
628 complain = true;
629 }
630 else if (!mutt_istr_equal(b->subtype, "octet-stream"))
631 return SEC_NO_FLAGS;
632
633 t = mutt_param_get(&b->parameter, "name");
634
635 if (!t)
636 t = b->d_filename;
637 if (!t)
638 t = b->filename;
639 if (!t)
640 {
641 if (complain)
642 {
643 mutt_message(_("S/MIME messages with no hints on content are unsupported"));
644 }
645 return SEC_NO_FLAGS;
646 }
647
648 /* no .p7c, .p10 support yet. */
649
650 int len = mutt_str_len(t) - 4;
651 if ((len > 0) && (*(t + len) == '.'))
652 {
653 len++;
654 if (mutt_istr_equal((t + len), "p7m"))
655 {
656 /* Not sure if this is the correct thing to do, but
657 * it's required for compatibility with Outlook */
658 return SMIME_SIGN | SMIME_OPAQUE;
659 }
660 else if (mutt_istr_equal((t + len), "p7s"))
661 return SMIME_SIGN | SMIME_OPAQUE;
662 }
663
664 return SEC_NO_FLAGS;
665}
size_t mutt_str_len(const char *a)
Calculate the length of a string, safely.
Definition: string.c:567
#define SMIME_OPAQUE
Definition: lib.h:106
#define SMIME_ENCRYPT
Definition: lib.h:102
char * d_filename
filename to be used for the content-disposition header If NULL, filename is used instead.
Definition: body.h:56
char * description
content-description
Definition: body.h:55
char * filename
When sending a message, this is the file to which this structure refers.
Definition: body.h:58
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◆ crypt_query()

SecurityFlags crypt_query ( struct Body b)

Check out the type of encryption used.

Parameters
bBody of email
Return values
numFlags, see SecurityFlags
0Error (SEC_NO_FLAGS)

Set the cached status values if there are any.

Definition at line 675 of file crypt.c.

676{
677 if (!WithCrypto || !b)
678 return SEC_NO_FLAGS;
679
681
682 if (b->type == TYPE_APPLICATION)
683 {
686
688 {
690 if (rc && b->goodsig)
691 rc |= SEC_GOODSIGN;
692 if (rc && b->badsig)
693 rc |= SEC_BADSIGN;
694 }
695 }
696 else if (((WithCrypto & APPLICATION_PGP) != 0) && (b->type == TYPE_TEXT))
697 {
699 if (rc && b->goodsig)
700 rc |= SEC_GOODSIGN;
701 }
702
703 if (b->type == TYPE_MULTIPART)
704 {
708
709 if (rc && b->goodsig)
710 rc |= SEC_GOODSIGN;
711#ifdef USE_AUTOCRYPT
712 if (rc && b->is_autocrypt)
713 rc |= SEC_AUTOCRYPT;
714#endif
715 }
716
717 if ((b->type == TYPE_MULTIPART) || (b->type == TYPE_MESSAGE))
718 {
719 SecurityFlags u = b->parts ? SEC_ALL_FLAGS : SEC_NO_FLAGS; /* Bits set in all parts */
720 SecurityFlags w = SEC_NO_FLAGS; /* Bits set in any part */
721
722 for (b = b->parts; b; b = b->next)
723 {
724 const SecurityFlags v = crypt_query(b);
725 u &= v;
726 w |= v;
727 }
728 rc |= u | (w & ~SEC_GOODSIGN);
729
730 if ((w & SEC_GOODSIGN) && !(u & SEC_GOODSIGN))
731 rc |= SEC_PARTSIGN;
732 }
733
734 return rc;
735}
SecurityFlags mutt_is_application_pgp(struct Body *b)
Does the message use PGP?
Definition: crypt.c:544
SecurityFlags mutt_is_multipart_signed(struct Body *b)
Is a message signed?
Definition: crypt.c:402
SecurityFlags mutt_is_application_smime(struct Body *b)
Does the message use S/MIME?
Definition: crypt.c:601
SecurityFlags mutt_is_malformed_multipart_pgp_encrypted(struct Body *b)
Check for malformed layout.
Definition: crypt.c:500
SecurityFlags crypt_query(struct Body *b)
Check out the type of encryption used.
Definition: crypt.c:675
@ TYPE_MESSAGE
Type: 'message/*'.
Definition: mime.h:35
#define SEC_ALL_FLAGS
Definition: lib.h:94
#define SEC_GOODSIGN
Email has a valid signature.
Definition: lib.h:80
#define SEC_BADSIGN
Email has a bad signature.
Definition: lib.h:81
#define SEC_PARTSIGN
Not all parts of the email is signed.
Definition: lib.h:82
bool badsig
Bad cryptographic signature (needed to check encrypted s/mime-signatures)
Definition: body.h:43
bool is_autocrypt
Flag autocrypt-decrypted messages for replying.
Definition: body.h:50
bool goodsig
Good cryptographic signature.
Definition: body.h:45
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◆ crypt_write_signed()

int crypt_write_signed ( struct Body a,
struct State s,
const char *  tempfile 
)

Write the message body/part.

Parameters
aBody to write
sState to use
tempfileFile to write to
Return values
0Success
-1Error

Body/part A described by state S to the given TEMPFILE.

Definition at line 747 of file crypt.c.

748{
749 if (!WithCrypto)
750 return -1;
751
752 FILE *fp = mutt_file_fopen(tempfile, "w");
753 if (!fp)
754 {
755 mutt_perror(tempfile);
756 return -1;
757 }
758
759 if (!mutt_file_seek(s->fp_in, a->hdr_offset, SEEK_SET))
760 {
761 mutt_file_fclose(&fp);
762 return -1;
763 }
764 size_t bytes = a->length + a->offset - a->hdr_offset;
765 bool hadcr = false;
766 while (bytes > 0)
767 {
768 const int c = fgetc(s->fp_in);
769 if (c == EOF)
770 break;
771
772 bytes--;
773
774 if (c == '\r')
775 hadcr = true;
776 else
777 {
778 if ((c == '\n') && !hadcr)
779 fputc('\r', fp);
780
781 hadcr = false;
782 }
783
784 fputc(c, fp);
785 }
786 mutt_file_fclose(&fp);
787
788 return 0;
789}
FILE * mutt_file_fopen(const char *path, const char *mode)
Call fopen() safely.
Definition: file.c:618
int mutt_file_fclose(FILE **fp)
Close a FILE handle (and NULL the pointer)
Definition: file.c:152
bool mutt_file_seek(FILE *fp, LOFF_T offset, int whence)
Wrapper for fseeko with error handling.
Definition: file.c:690
#define mutt_perror(...)
Definition: logging.h:88
LOFF_T offset
offset where the actual data begins
Definition: body.h:52
long hdr_offset
Offset in stream where the headers begin.
Definition: body.h:80
FILE * fp_in
File to read from.
Definition: state.h:47
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◆ crypt_convert_to_7bit()

void crypt_convert_to_7bit ( struct Body a)

Convert an email to 7bit encoding.

Parameters
aBody of email to convert

Definition at line 795 of file crypt.c.

796{
797 if (!WithCrypto)
798 return;
799
800 const bool c_pgp_strict_enc = cs_subset_bool(NeoMutt->sub, "pgp_strict_enc");
801 while (a)
802 {
803 if (a->type == TYPE_MULTIPART)
804 {
805 if (a->encoding != ENC_7BIT)
806 {
807 a->encoding = ENC_7BIT;
809 }
810 else if (((WithCrypto & APPLICATION_PGP) != 0) && c_pgp_strict_enc)
812 }
813 else if ((a->type == TYPE_MESSAGE) && !mutt_istr_equal(a->subtype, "delivery-status"))
814 {
815 if (a->encoding != ENC_7BIT)
817 }
818 else if (a->encoding == ENC_8BIT)
820 else if (a->encoding == ENC_BINARY)
821 a->encoding = ENC_BASE64;
822 else if (a->content && (a->encoding != ENC_BASE64) &&
823 (a->content->from || (a->content->space && c_pgp_strict_enc)))
824 {
826 }
827 a = a->next;
828 }
829}
void crypt_convert_to_7bit(struct Body *a)
Convert an email to 7bit encoding.
Definition: crypt.c:795
@ ENC_7BIT
7-bit text
Definition: mime.h:49
@ ENC_BINARY
Binary.
Definition: mime.h:53
@ ENC_BASE64
Base-64 encoded text.
Definition: mime.h:52
@ ENC_8BIT
8-bit text
Definition: mime.h:50
@ ENC_QUOTED_PRINTABLE
Quoted-printable text.
Definition: mime.h:51
void mutt_message_to_7bit(struct Body *a, FILE *fp, struct ConfigSubset *sub)
Convert an email's MIME parts to 7-bit.
Definition: sendlib.c:254
struct Content * content
Detailed info about the content of the attachment.
Definition: body.h:69
unsigned int encoding
content-transfer-encoding, ContentEncoding
Definition: body.h:41
bool space
Whitespace at the end of lines?
Definition: content.h:42
bool from
Has a line beginning with "From "?
Definition: content.h:44
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◆ crypt_extract_keys_from_messages()

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

Extract keys from a message.

Parameters
mMailbox
elList of Emails to process

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

Definition at line 838 of file crypt.c.

839{
840 if (!WithCrypto)
841 return;
842
843 struct Buffer *tempfname = mutt_buffer_pool_get();
844 mutt_buffer_mktemp(tempfname);
845 FILE *fp_out = mutt_file_fopen(mutt_buffer_string(tempfname), "w");
846 if (!fp_out)
847 {
849 goto cleanup;
850 }
851
854
855 struct EmailNode *en = NULL;
856 STAILQ_FOREACH(en, el, entries)
857 {
858 struct Email *e = en->email;
859 struct Message *msg = mx_msg_open(m, e->msgno);
860 if (!msg)
861 {
862 continue;
863 }
866 {
867 mx_msg_close(m, &msg);
868 mutt_file_fclose(&fp_out);
869 break;
870 }
871
872 if (((WithCrypto & APPLICATION_PGP) != 0) && (e->security & APPLICATION_PGP))
873 {
875 fflush(fp_out);
876
877 mutt_endwin();
878 puts(_("Trying to extract PGP keys...\n"));
880 }
881
883 {
884 const bool encrypt = e->security & SEC_ENCRYPT;
885 mutt_copy_message(fp_out, e, msg,
888 CH_NO_FLAGS, 0);
889 fflush(fp_out);
890
891 char *mbox = NULL;
892 if (!TAILQ_EMPTY(&e->env->from))
893 {
895 mbox = TAILQ_FIRST(&e->env->from)->mailbox;
896 }
897 else if (!TAILQ_EMPTY(&e->env->sender))
898 {
900 mbox = TAILQ_FIRST(&e->env->sender)->mailbox;
901 }
902 if (mbox)
903 {
904 mutt_endwin();
905 puts(_("Trying to extract S/MIME certificates..."));
907 }
908 }
909 mx_msg_close(m, &msg);
910
911 rewind(fp_out);
912 }
913
914 mutt_file_fclose(&fp_out);
915 if (isendwin())
917
919
921 OptDontHandlePgpKeys = false;
922
923cleanup:
924 mutt_buffer_pool_release(&tempfname);
925}
void mutt_expand_aliases(struct AddressList *al)
Expand aliases in a List of Addresses.
Definition: alias.c:298
void mutt_parse_mime_message(struct Email *e, FILE *fp)
Parse a MIME email.
Definition: attachments.c:591
static const char * mutt_buffer_string(const struct Buffer *buf)
Convert a buffer to a const char * "string".
Definition: buffer.h:77
int mutt_copy_message(FILE *fp_out, struct Email *e, struct Message *msg, CopyMessageFlags cmflags, CopyHeaderFlags chflags, int wraplen)
Copy a message from a Mailbox.
Definition: copy.c:864
#define MUTT_CM_DECODE
Decode the message body into text/plain.
Definition: copy.h:38
#define MUTT_CM_CHARCONV
Perform character set conversions.
Definition: copy.h:42
#define MUTT_CM_DECODE_SMIME
Used for decoding S/MIME messages.
Definition: copy.h:46
#define MUTT_CM_NO_FLAGS
No flags are set.
Definition: copy.h:35
#define MUTT_CM_DECODE_CRYPT
Definition: copy.h:48
#define MUTT_CM_NOHEADER
Don't copy the message header.
Definition: copy.h:36
#define CH_NO_FLAGS
No flags are set.
Definition: copy.h:51
void crypt_pgp_invoke_import(const char *fname)
Wrapper for CryptModuleSpecs::pgp_invoke_import()
Definition: cryptglue.c:364
void crypt_smime_invoke_import(const char *infile, const char *mailbox)
Wrapper for CryptModuleSpecs::smime_invoke_import()
Definition: cryptglue.c:508
int mutt_any_key_to_continue(const char *s)
Prompt the user to 'press any key' and wait.
Definition: curs_lib.c:387
void mutt_file_unlink(const char *s)
Delete a file, carefully.
Definition: file.c:194
#define mutt_buffer_mktemp(buf)
Definition: muttlib.h:74
int mx_msg_close(struct Mailbox *m, struct Message **msg)
Close a message.
Definition: mx.c:1193
struct Message * mx_msg_open(struct Mailbox *m, int msgno)
Return a stream pointer for a message.
Definition: mx.c:1147
bool OptDontHandlePgpKeys
(pseudo) used to extract PGP keys
Definition: options.h:41
void mutt_buffer_pool_release(struct Buffer **pbuf)
Free a Buffer from the pool.
Definition: pool.c:112
struct Buffer * mutt_buffer_pool_get(void)
Get a Buffer from the pool.
Definition: pool.c:101
#define STAILQ_FOREACH(var, head, field)
Definition: queue.h:352
#define TAILQ_EMPTY(head)
Definition: queue.h:721
String manipulation buffer.
Definition: buffer.h:34
List of Emails.
Definition: email.h:132
struct Email * email
Email in the list.
Definition: email.h:133
The envelope/body of an email.
Definition: email.h:37
int msgno
Number displayed to the user.
Definition: email.h:111
struct AddressList sender
Email's sender.
Definition: envelope.h:63
A local copy of an email.
Definition: mxapi.h:43
FILE * fp
pointer to the message data
Definition: mxapi.h:44
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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]eEmail with addresses to match
[out]keylistKeys needed
[in]oppenc_modeIf true, use opportunistic encryption
Return values
0Success
-1Error

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 941 of file crypt.c.

942{
943 if (!WithCrypto)
944 return 0;
945
946 struct AddressList addrlist = TAILQ_HEAD_INITIALIZER(addrlist);
947 const char *fqdn = mutt_fqdn(true, NeoMutt->sub);
948 const char *self_encrypt = NULL;
949
950 /* Do a quick check to make sure that we can find all of the encryption
951 * keys if the user has requested this service. */
952
953 *keylist = NULL;
954
955#ifdef USE_AUTOCRYPT
956 if (!oppenc_mode && (e->security & SEC_AUTOCRYPT))
957 {
959 return -1;
960 return 0;
961 }
962#endif
963
965 OptPgpCheckTrust = true;
966
967 mutt_addrlist_copy(&addrlist, &e->env->to, false);
968 mutt_addrlist_copy(&addrlist, &e->env->cc, false);
969 mutt_addrlist_copy(&addrlist, &e->env->bcc, false);
970 mutt_addrlist_qualify(&addrlist, fqdn);
971 mutt_addrlist_dedupe(&addrlist);
972
973 if (oppenc_mode || (e->security & SEC_ENCRYPT))
974 {
975 if (((WithCrypto & APPLICATION_PGP) != 0) && (e->security & APPLICATION_PGP))
976 {
977 *keylist = crypt_pgp_find_keys(&addrlist, oppenc_mode);
978 if (!*keylist)
979 {
980 mutt_addrlist_clear(&addrlist);
981 return -1;
982 }
983 OptPgpCheckTrust = false;
984 const bool c_pgp_self_encrypt = cs_subset_bool(NeoMutt->sub, "pgp_self_encrypt");
985 const char *const c_pgp_default_key = cs_subset_string(NeoMutt->sub, "pgp_default_key");
986 const enum QuadOption c_pgp_encrypt_self = cs_subset_quad(NeoMutt->sub, "pgp_encrypt_self");
987 if (c_pgp_self_encrypt || (c_pgp_encrypt_self == MUTT_YES))
988 self_encrypt = c_pgp_default_key;
989 }
991 {
992 *keylist = crypt_smime_find_keys(&addrlist, oppenc_mode);
993 if (!*keylist)
994 {
995 mutt_addrlist_clear(&addrlist);
996 return -1;
997 }
998 const bool c_smime_self_encrypt = cs_subset_bool(NeoMutt->sub, "smime_self_encrypt");
999 const char *const c_smime_default_key = cs_subset_string(NeoMutt->sub, "smime_default_key");
1000 const enum QuadOption c_smime_encrypt_self = cs_subset_quad(NeoMutt->sub, "smime_encrypt_self");
1001 if (c_smime_self_encrypt || (c_smime_encrypt_self == MUTT_YES))
1002 self_encrypt = c_smime_default_key;
1003 }
1004 }
1005
1006 if (!oppenc_mode && self_encrypt)
1007 {
1008 const size_t keylist_size = mutt_str_len(*keylist);
1009 mutt_mem_realloc(keylist, keylist_size + mutt_str_len(self_encrypt) + 2);
1010 sprintf(*keylist + keylist_size, " %s", self_encrypt);
1011 }
1012
1013 mutt_addrlist_clear(&addrlist);
1014
1015 return 0;
1016}
void mutt_addrlist_copy(struct AddressList *dst, const struct AddressList *src, bool prune)
Copy a list of addresses into another list.
Definition: address.c:737
void mutt_addrlist_qualify(struct AddressList *al, const char *host)
Expand local names in an Address list using a hostname.
Definition: address.c:650
void mutt_addrlist_clear(struct AddressList *al)
Unlink and free all Address in an AddressList.
Definition: address.c:1470
void mutt_addrlist_dedupe(struct AddressList *al)
Remove duplicate addresses.
Definition: address.c:1407
@ AUTOCRYPT_REC_NO
Do no use Autocrypt.
Definition: lib.h:159
enum AutocryptRec mutt_autocrypt_ui_recommendation(const struct Email *e, char **keylist)
Get the recommended action for an Email.
Definition: autocrypt.c:567
const char * cs_subset_string(const struct ConfigSubset *sub, const char *name)
Get a string config item by name.
Definition: helpers.c:317
char * crypt_smime_find_keys(struct AddressList *addrlist, bool oppenc_mode)
Wrapper for CryptModuleSpecs::find_keys()
Definition: cryptglue.c:475
char * crypt_pgp_find_keys(struct AddressList *addrlist, bool oppenc_mode)
Wrapper for CryptModuleSpecs::find_keys()
Definition: cryptglue.c:316
void mutt_mem_realloc(void *ptr, size_t size)
Resize a block of memory on the heap.
Definition: memory.c:114
bool OptPgpCheckTrust
(pseudo) used by dlg_select_pgp_key()
Definition: options.h:54
#define TAILQ_HEAD_INITIALIZER(head)
Definition: queue.h:637
const char * mutt_fqdn(bool may_hide_host, const struct ConfigSubset *sub)
Get the Fully-Qualified Domain Name.
Definition: sendlib.c:698
struct AddressList to
Email's 'To' list.
Definition: envelope.h:60
struct AddressList cc
Email's 'Cc' list.
Definition: envelope.h:61
struct AddressList bcc
Email's 'Bcc' list.
Definition: envelope.h:62
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◆ crypt_opportunistic_encrypt()

void crypt_opportunistic_encrypt ( struct Email e)

Can all recipients be determined.

Parameters
eEmail

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

Definition at line 1025 of file crypt.c.

1026{
1027 if (!WithCrypto)
1028 return;
1029
1030 const bool c_crypt_opportunistic_encrypt = cs_subset_bool(NeoMutt->sub, "crypt_opportunistic_encrypt");
1031 if (!(c_crypt_opportunistic_encrypt && (e->security & SEC_OPPENCRYPT)))
1032 return;
1033
1034 char *pgpkeylist = NULL;
1035
1036 crypt_get_keys(e, &pgpkeylist, 1);
1037 if (pgpkeylist)
1038 {
1039 e->security |= SEC_ENCRYPT;
1040 FREE(&pgpkeylist);
1041 }
1042 else
1043 {
1044 e->security &= ~SEC_ENCRYPT;
1045 }
1046}
int crypt_get_keys(struct Email *e, char **keylist, bool oppenc_mode)
Check we have all the keys we need.
Definition: crypt.c:941
#define FREE(x)
Definition: memory.h:43
#define SEC_OPPENCRYPT
Opportunistic encrypt mode.
Definition: lib.h:86
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◆ crypt_fetch_signatures()

static void crypt_fetch_signatures ( struct Body ***  signatures,
struct Body a,
int *  n 
)
static

Create an array of an emails parts.

Parameters
[out]signaturesArray of Body parts
[in]aBody part to examine
[out]nCumulative count of parts

Definition at line 1054 of file crypt.c.

1055{
1056 if (!WithCrypto)
1057 return;
1058
1059 for (; a; a = a->next)
1060 {
1061 if (a->type == TYPE_MULTIPART)
1062 crypt_fetch_signatures(signatures, a->parts, n);
1063 else
1064 {
1065 if ((*n % 5) == 0)
1066 mutt_mem_realloc(signatures, (*n + 6) * sizeof(struct Body **));
1067
1068 (*signatures)[(*n)++] = a;
1069 }
1070 }
1071}
static void crypt_fetch_signatures(struct Body ***signatures, struct Body *a, int *n)
Create an array of an emails parts.
Definition: crypt.c:1054
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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
eEmail to test
Return values
trueThe subject should be protected

Definition at line 1078 of file crypt.c.

1079{
1080 const bool c_crypt_protected_headers_write = cs_subset_bool(NeoMutt->sub, "crypt_protected_headers_write");
1081 const char *const c_crypt_protected_headers_subject =
1082 cs_subset_string(NeoMutt->sub, "crypt_protected_headers_subject");
1083 if (c_crypt_protected_headers_write && (e->security & (SEC_ENCRYPT | SEC_AUTOCRYPT)) &&
1084 !(e->security & SEC_INLINE) && c_crypt_protected_headers_subject)
1085 {
1086 return true;
1087 }
1088
1089 return false;
1090}
#define SEC_INLINE
Email has an inline signature.
Definition: lib.h:85
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◆ crypt_get_fingerprint_or_id()

const char * crypt_get_fingerprint_or_id ( const char *  p,
const char **  pphint,
const char **  ppl,
const char **  pps 
)

Get the fingerprint or long key ID.

Parameters
[in]pString to examine
[out]pphintStart of string to be passed to pgp_add_string_to_hints() or crypt_add_string_to_hints()
[out]pplStart of long key ID if detected, else NULL
[out]ppsStart of short key ID if detected, else NULL
Return values
ptrCopy of fingerprint, if any, stripped of all spaces. Must be FREE'd by caller
NULLOtherwise

Obtain pointers to fingerprint or short or long key ID, if any.

Upon return, at most one of return, *ppl and *pps pointers is non-NULL, indicating the longest fingerprint or ID found, if any.

Definition at line 1263 of file crypt.c.

1265{
1266 const char *ps = NULL, *pl = NULL, *phint = NULL;
1267 char *pfcopy = NULL, *s1 = NULL, *s2 = NULL;
1268 char c;
1269 int isid;
1270 size_t hexdigits;
1271
1272 /* User input may be partial name, fingerprint or short or long key ID,
1273 * independent of `$pgp_long_ids`.
1274 * Fingerprint without spaces is 40 hex digits (SHA-1) or 32 hex digits (MD5).
1275 * Strip leading "0x" for key ID detection and prepare pl and ps to indicate
1276 * if an ID was found and to simplify logic in the key loop's inner
1277 * condition of the caller. */
1278
1279 char *pf = mutt_str_skip_whitespace(p);
1280 if (mutt_istr_startswith(pf, "0x"))
1281 pf += 2;
1282
1283 /* Check if a fingerprint is given, must be hex digits only, blanks
1284 * separating groups of 4 hex digits are allowed. Also pre-check for ID. */
1285 isid = 2; /* unknown */
1286 hexdigits = 0;
1287 s1 = pf;
1288 do
1289 {
1290 c = *(s1++);
1291 if ((('0' <= c) && (c <= '9')) || (('A' <= c) && (c <= 'F')) ||
1292 (('a' <= c) && (c <= 'f')))
1293 {
1294 hexdigits++;
1295 if (isid == 2)
1296 isid = 1; /* it is an ID so far */
1297 }
1298 else if (c)
1299 {
1300 isid = 0; /* not an ID */
1301 if ((c == ' ') && ((hexdigits % 4) == 0))
1302 ; /* skip blank before or after 4 hex digits */
1303 else
1304 break; /* any other character or position */
1305 }
1306 } while (c);
1307
1308 /* If at end of input, check for correct fingerprint length and copy if. */
1309 pfcopy = (!c && ((hexdigits == 40) || (hexdigits == 32)) ? mutt_str_dup(pf) : NULL);
1310
1311 if (pfcopy)
1312 {
1313 /* Use pfcopy to strip all spaces from fingerprint and as hint. */
1314 s1 = pfcopy;
1315 s2 = pfcopy;
1316 do
1317 {
1318 *(s1++) = *(s2 = mutt_str_skip_whitespace(s2));
1319 } while (*(s2++));
1320
1321 phint = pfcopy;
1322 ps = NULL;
1323 pl = NULL;
1324 }
1325 else
1326 {
1327 phint = p;
1328 ps = NULL;
1329 pl = NULL;
1330 if (isid == 1)
1331 {
1332 if (mutt_str_len(pf) == 16)
1333 pl = pf; /* long key ID */
1334 else if (mutt_str_len(pf) == 8)
1335 ps = pf; /* short key ID */
1336 }
1337 }
1338
1339 *pphint = phint;
1340 *ppl = pl;
1341 *pps = ps;
1342 return pfcopy;
1343}
char * mutt_str_dup(const char *str)
Copy a string, safely.
Definition: string.c:250
char * mutt_str_skip_whitespace(const char *p)
Find the first non-whitespace character in a string.
Definition: string.c:622
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◆ crypt_is_numerical_keyid()

bool crypt_is_numerical_keyid ( const char *  s)

Is this a numerical keyid.

Parameters
sKey to test
Return values
trueKeyid is numeric

Check if a crypt-hook value is a key id.

Definition at line 1352 of file crypt.c.

1353{
1354 /* or should we require the "0x"? */
1355 if (mutt_strn_equal(s, "0x", 2))
1356 s += 2;
1357 if (strlen(s) % 8)
1358 return false;
1359 while (*s)
1360 if (!strchr("0123456789ABCDEFabcdef", *s++))
1361 return false;
1362
1363 return true;
1364}
bool mutt_strn_equal(const char *a, const char *b, size_t num)
Check for equality of two strings (to a maximum), safely.
Definition: string.c:496
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