/* * Copyright (C) 1996,1997 Michael R. Elkins * Copyright (C) 1998,1999 Thomas Roessler * Copyright (C) 2004 g10 Code GmbH * * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* * This file contains all of the PGP routines necessary to sign, encrypt, * verify and decrypt PGP messages in either the new PGP/MIME format, or * in the older Application/Pgp format. It also contains some code to * cache the user's passphrase for repeat use when decrypting or signing * a message. */ #if HAVE_CONFIG_H # include "config.h" #endif #include "mutt.h" #include "mutt_curses.h" #include "pgp.h" #include "mime.h" #include "copy.h" #include #include #include #include #include #include #include #ifdef HAVE_LOCALE_H #include #endif #ifdef HAVE_SYS_TIME_H # include #endif #ifdef HAVE_SYS_RESOURCE_H # include #endif #ifdef CRYPT_BACKEND_CLASSIC_PGP #include "mutt_crypt.h" #include "mutt_menu.h" char PgpPass[LONG_STRING]; time_t PgpExptime = 0; /* when does the cached passphrase expire? */ void pgp_void_passphrase (void) { memset (PgpPass, 0, sizeof (PgpPass)); PgpExptime = 0; } int pgp_valid_passphrase (void) { time_t now = time (NULL); if (pgp_use_gpg_agent()) { *PgpPass = 0; return 1; /* handled by gpg-agent */ } if (now < PgpExptime) /* Use cached copy. */ return 1; pgp_void_passphrase (); if (mutt_get_password (_("Enter PGP passphrase:"), PgpPass, sizeof (PgpPass)) == 0) { PgpExptime = time (NULL) + PgpTimeout; return (1); } else PgpExptime = 0; return 0; } void pgp_forget_passphrase (void) { pgp_void_passphrase (); mutt_message _("PGP passphrase forgotten."); } int pgp_use_gpg_agent (void) { char *tty; if (!option (OPTUSEGPGAGENT) || !getenv ("GPG_AGENT_INFO")) return 0; if ((tty = ttyname(0))) setenv("GPG_TTY", tty, 0); return 1; } char *pgp_keyid(pgp_key_t k) { if((k->flags & KEYFLAG_SUBKEY) && k->parent && option(OPTPGPIGNORESUB)) k = k->parent; return _pgp_keyid(k); } char *_pgp_keyid(pgp_key_t k) { if(option(OPTPGPLONGIDS)) return k->keyid; else return (k->keyid + 8); } /* ---------------------------------------------------------------------------- * Routines for handing PGP input. */ /* Copy PGP output messages and look for signs of a good signature */ static int pgp_copy_checksig (FILE *fpin, FILE *fpout) { int rv = -1; if (PgpGoodSign.pattern) { char *line = NULL; int lineno = 0; size_t linelen; while ((line = mutt_read_line (line, &linelen, fpin, &lineno)) != NULL) { if (regexec (PgpGoodSign.rx, line, 0, NULL, 0) == 0) { dprint (2, (debugfile, "pgp_copy_checksig: \"%s\" matches regexp.\n", line)); rv = 0; } else dprint (2, (debugfile, "pgp_copy_checksig: \"%s\" doesn't match regexp.\n", line)); if (strncmp (line, "[GNUPG:] ", 9) == 0) continue; fputs (line, fpout); fputc ('\n', fpout); } FREE (&line); } else { dprint (2, (debugfile, "pgp_copy_checksig: No pattern.\n")); mutt_copy_stream (fpin, fpout); rv = 1; } return rv; } /* * Copy a clearsigned message, and strip the signature and PGP's * dash-escaping. * * XXX - charset handling: We assume that it is safe to do * character set decoding first, dash decoding second here, while * we do it the other way around in the main handler. * * (Note that we aren't worse than Outlook &c in this, and also * note that we can successfully handle anything produced by any * existing versions of mutt.) */ static void pgp_copy_clearsigned (FILE *fpin, STATE *s, char *charset) { char buf[HUGE_STRING]; short complete, armor_header; FGETCONV *fc; rewind (fpin); /* fromcode comes from the MIME Content-Type charset label. It might * be a wrong label, so we want the ability to do corrections via * charset-hooks. Therefore we set flags to M_ICONV_HOOK_FROM. */ fc = fgetconv_open (fpin, charset, Charset, M_ICONV_HOOK_FROM); for (complete = 1, armor_header = 1; fgetconvs (buf, sizeof (buf), fc) != NULL; complete = strchr (buf, '\n') != NULL) { if (!complete) { if (!armor_header) state_puts (buf, s); continue; } if (mutt_strcmp (buf, "-----BEGIN PGP SIGNATURE-----\n") == 0) break; if (armor_header) { char *p = mutt_skip_whitespace (buf); if (*p == '\0') armor_header = 0; continue; } if (s->prefix) state_puts (s->prefix, s); if (buf[0] == '-' && buf[1] == ' ') state_puts (buf + 2, s); else state_puts (buf, s); } fgetconv_close (&fc); } /* Support for the Application/PGP Content Type. */ int pgp_application_pgp_handler (BODY *m, STATE *s) { int could_not_decrypt = 0; int needpass = -1, pgp_keyblock = 0; int clearsign = 0, rv, rc; int c = 1; /* silence GCC warning */ long start_pos = 0; long bytes; LOFF_T last_pos, offset; char buf[HUGE_STRING]; char outfile[_POSIX_PATH_MAX]; char tmpfname[_POSIX_PATH_MAX]; FILE *pgpout = NULL, *pgpin = NULL, *pgperr = NULL; FILE *tmpfp = NULL; pid_t thepid; short maybe_goodsig = 1; short have_any_sigs = 0; char body_charset[STRING]; mutt_get_body_charset (body_charset, sizeof (body_charset), m); rc = 0; /* silence false compiler warning if (s->flags & M_DISPLAY) */ fseeko (s->fpin, m->offset, 0); last_pos = m->offset; for (bytes = m->length; bytes > 0;) { if (fgets (buf, sizeof (buf), s->fpin) == NULL) break; offset = ftello (s->fpin); bytes -= (offset - last_pos); /* don't rely on mutt_strlen(buf) */ last_pos = offset; if (mutt_strncmp ("-----BEGIN PGP ", buf, 15) == 0) { clearsign = 0; start_pos = last_pos; if (mutt_strcmp ("MESSAGE-----\n", buf + 15) == 0) needpass = 1; else if (mutt_strcmp ("SIGNED MESSAGE-----\n", buf + 15) == 0) { clearsign = 1; needpass = 0; } else if (!option (OPTDONTHANDLEPGPKEYS) && mutt_strcmp ("PUBLIC KEY BLOCK-----\n", buf + 15) == 0) { needpass = 0; pgp_keyblock =1; } else { /* XXX - we may wish to recode here */ if (s->prefix) state_puts (s->prefix, s); state_puts (buf, s); continue; } have_any_sigs = have_any_sigs || (clearsign && (s->flags & M_VERIFY)); /* Copy PGP material to temporary file */ mutt_mktemp (tmpfname); if ((tmpfp = safe_fopen (tmpfname, "w+")) == NULL) { mutt_perror (tmpfname); return -1; } fputs (buf, tmpfp); while (bytes > 0 && fgets (buf, sizeof (buf) - 1, s->fpin) != NULL) { offset = ftello (s->fpin); bytes -= (offset - last_pos); /* don't rely on mutt_strlen(buf) */ last_pos = offset; fputs (buf, tmpfp); if ((needpass && mutt_strcmp ("-----END PGP MESSAGE-----\n", buf) == 0) || (!needpass && (mutt_strcmp ("-----END PGP SIGNATURE-----\n", buf) == 0 || mutt_strcmp ("-----END PGP PUBLIC KEY BLOCK-----\n",buf) == 0))) break; } /* leave tmpfp open in case we still need it - but flush it! */ fflush (tmpfp); /* Invoke PGP if needed */ if (!clearsign || (s->flags & M_VERIFY)) { mutt_mktemp (outfile); if ((pgpout = safe_fopen (outfile, "w+")) == NULL) { mutt_perror (tmpfname); return -1; } if ((thepid = pgp_invoke_decode (&pgpin, NULL, &pgperr, -1, fileno (pgpout), -1, tmpfname, needpass)) == -1) { safe_fclose (&pgpout); maybe_goodsig = 0; pgpin = NULL; pgperr = NULL; state_attach_puts (_("[-- Error: unable to create PGP subprocess! --]\n"), s); } else /* PGP started successfully */ { if (needpass) { if (!pgp_valid_passphrase ()) pgp_void_passphrase(); if (pgp_use_gpg_agent()) *PgpPass = 0; fprintf (pgpin, "%s\n", PgpPass); } safe_fclose (&pgpin); if (s->flags & M_DISPLAY) { crypt_current_time (s, "PGP"); rc = pgp_copy_checksig (pgperr, s->fpout); } safe_fclose (&pgperr); rv = mutt_wait_filter (thepid); if (s->flags & M_DISPLAY) { if (rc == 0) have_any_sigs = 1; /* * Sig is bad if * gpg_good_sign-pattern did not match || pgp_decode_command returned not 0 * Sig _is_ correct if * gpg_good_sign="" && pgp_decode_command returned 0 */ if (rc == -1 || rv) maybe_goodsig = 0; state_attach_puts (_("[-- End of PGP output --]\n\n"), s); } } /* treat empty result as sign of failure */ /* TODO: maybe on failure mutt should include the original undecoded text. */ if (pgpout) { rewind (pgpout); c = fgetc (pgpout); ungetc (c, pgpout); } if (!clearsign && (!pgpout || c == EOF)) { could_not_decrypt = 1; pgp_void_passphrase (); } if (could_not_decrypt && !(s->flags & M_DISPLAY)) { mutt_error _("Could not decrypt PGP message"); mutt_sleep (1); rc = -1; goto out; } } /* * Now, copy cleartext to the screen. NOTE - we expect that PGP * outputs utf-8 cleartext. This may not always be true, but it * seems to be a reasonable guess. */ if(s->flags & M_DISPLAY) { if (needpass) state_attach_puts (_("[-- BEGIN PGP MESSAGE --]\n\n"), s); else if (pgp_keyblock) state_attach_puts (_("[-- BEGIN PGP PUBLIC KEY BLOCK --]\n"), s); else state_attach_puts (_("[-- BEGIN PGP SIGNED MESSAGE --]\n\n"), s); } if (clearsign) { rewind (tmpfp); if (tmpfp) pgp_copy_clearsigned (tmpfp, s, body_charset); } else if (pgpout) { FGETCONV *fc; int c; rewind (pgpout); state_set_prefix (s); fc = fgetconv_open (pgpout, "utf-8", Charset, 0); while ((c = fgetconv (fc)) != EOF) state_prefix_putc (c, s); fgetconv_close (&fc); } if (s->flags & M_DISPLAY) { state_putc ('\n', s); if (needpass) { state_attach_puts (_("[-- END PGP MESSAGE --]\n"), s); if (could_not_decrypt) mutt_error _("Could not decrypt PGP message"); else mutt_message _("PGP message successfully decrypted."); } else if (pgp_keyblock) state_attach_puts (_("[-- END PGP PUBLIC KEY BLOCK --]\n"), s); else state_attach_puts (_("[-- END PGP SIGNED MESSAGE --]\n"), s); } } else { /* XXX - we may wish to recode here */ if (s->prefix) state_puts (s->prefix, s); state_puts (buf, s); } } rc = 0; out: m->goodsig = (maybe_goodsig && have_any_sigs); if (tmpfp) { safe_fclose (&tmpfp); mutt_unlink (tmpfname); } if (pgpout) { safe_fclose (&pgpout); mutt_unlink (outfile); } if (needpass == -1) { state_attach_puts (_("[-- Error: could not find beginning of PGP message! --]\n\n"), s); return -1; } return rc; } static int pgp_check_traditional_one_body (FILE *fp, BODY *b, int tagged_only) { char tempfile[_POSIX_PATH_MAX]; char buf[HUGE_STRING]; FILE *tfp; short sgn = 0; short enc = 0; short key = 0; if (b->type != TYPETEXT) return 0; if (tagged_only && !b->tagged) return 0; mutt_mktemp (tempfile); if (mutt_decode_save_attachment (fp, b, tempfile, 0, 0) != 0) { unlink (tempfile); return 0; } if ((tfp = fopen (tempfile, "r")) == NULL) { unlink (tempfile); return 0; } while (fgets (buf, sizeof (buf), tfp)) { if (mutt_strncmp ("-----BEGIN PGP ", buf, 15) == 0) { if (mutt_strcmp ("MESSAGE-----\n", buf + 15) == 0) enc = 1; else if (mutt_strcmp ("SIGNED MESSAGE-----\n", buf + 15) == 0) sgn = 1; else if (mutt_strcmp ("PUBLIC KEY BLOCK-----\n", buf + 15) == 0) key = 1; } } safe_fclose (&tfp); unlink (tempfile); if (!enc && !sgn && !key) return 0; /* fix the content type */ mutt_set_parameter ("format", "fixed", &b->parameter); if (enc) mutt_set_parameter ("x-action", "pgp-encrypted", &b->parameter); else if (sgn) mutt_set_parameter ("x-action", "pgp-signed", &b->parameter); else if (key) mutt_set_parameter ("x-action", "pgp-keys", &b->parameter); return 1; } int pgp_check_traditional (FILE *fp, BODY *b, int tagged_only) { int rv = 0; int r; for (; b; b = b->next) { if (is_multipart (b)) rv = pgp_check_traditional (fp, b->parts, tagged_only) || rv; else if (b->type == TYPETEXT) { if ((r = mutt_is_application_pgp (b))) rv = rv || r; else rv = pgp_check_traditional_one_body (fp, b, tagged_only) || rv; } } return rv; } int pgp_verify_one (BODY *sigbdy, STATE *s, const char *tempfile) { char sigfile[_POSIX_PATH_MAX], pgperrfile[_POSIX_PATH_MAX]; FILE *fp, *pgpout, *pgperr; pid_t thepid; int badsig = -1; int rv; snprintf (sigfile, sizeof (sigfile), "%s.asc", tempfile); if(!(fp = safe_fopen (sigfile, "w"))) { mutt_perror(sigfile); return -1; } fseeko (s->fpin, sigbdy->offset, 0); mutt_copy_bytes (s->fpin, fp, sigbdy->length); fclose (fp); mutt_mktemp(pgperrfile); if(!(pgperr = safe_fopen(pgperrfile, "w+"))) { mutt_perror(pgperrfile); unlink(sigfile); return -1; } crypt_current_time (s, "PGP"); if((thepid = pgp_invoke_verify (NULL, &pgpout, NULL, -1, -1, fileno(pgperr), tempfile, sigfile)) != -1) { if (pgp_copy_checksig (pgpout, s->fpout) >= 0) badsig = 0; safe_fclose (&pgpout); fflush (pgperr); rewind (pgperr); if (pgp_copy_checksig (pgperr, s->fpout) >= 0) badsig = 0; if ((rv = mutt_wait_filter (thepid))) badsig = -1; dprint (1, (debugfile, "pgp_verify_one: mutt_wait_filter returned %d.\n", rv)); } safe_fclose (&pgperr); state_attach_puts (_("[-- End of PGP output --]\n\n"), s); mutt_unlink (sigfile); mutt_unlink (pgperrfile); dprint (1, (debugfile, "pgp_verify_one: returning %d.\n", badsig)); return badsig; } /* Extract pgp public keys from messages or attachments */ void pgp_extract_keys_from_messages (HEADER *h) { int i; char tempfname[_POSIX_PATH_MAX]; FILE *fpout; if (h) { mutt_parse_mime_message (Context, h); if(h->security & PGPENCRYPT && !pgp_valid_passphrase ()) return; } mutt_mktemp (tempfname); if (!(fpout = safe_fopen (tempfname, "w"))) { mutt_perror (tempfname); return; } set_option (OPTDONTHANDLEPGPKEYS); if (!h) { for (i = 0; i < Context->vcount; i++) { if (Context->hdrs[Context->v2r[i]]->tagged) { mutt_parse_mime_message (Context, Context->hdrs[Context->v2r[i]]); if (Context->hdrs[Context->v2r[i]]->security & PGPENCRYPT && !pgp_valid_passphrase()) { fclose (fpout); goto bailout; } mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]], M_CM_DECODE|M_CM_CHARCONV, 0); } } } else { mutt_parse_mime_message (Context, h); if (h->security & PGPENCRYPT && !pgp_valid_passphrase()) { fclose (fpout); goto bailout; } mutt_copy_message (fpout, Context, h, M_CM_DECODE|M_CM_CHARCONV, 0); } fclose (fpout); mutt_endwin (NULL); pgp_invoke_import (tempfname); mutt_any_key_to_continue (NULL); bailout: mutt_unlink (tempfname); unset_option (OPTDONTHANDLEPGPKEYS); } static void pgp_extract_keys_from_attachment (FILE *fp, BODY *top) { STATE s; FILE *tempfp; char tempfname[_POSIX_PATH_MAX]; mutt_mktemp (tempfname); if (!(tempfp = safe_fopen (tempfname, "w"))) { mutt_perror (tempfname); return; } memset (&s, 0, sizeof (STATE)); s.fpin = fp; s.fpout = tempfp; mutt_body_handler (top, &s); fclose (tempfp); pgp_invoke_import (tempfname); mutt_any_key_to_continue (NULL); mutt_unlink (tempfname); } void pgp_extract_keys_from_attachment_list (FILE *fp, int tag, BODY *top) { if(!fp) { mutt_error _("Internal error. Inform ."); return; } mutt_endwin (NULL); set_option(OPTDONTHANDLEPGPKEYS); for(; top; top = top->next) { if(!tag || top->tagged) pgp_extract_keys_from_attachment (fp, top); if(!tag) break; } unset_option(OPTDONTHANDLEPGPKEYS); } BODY *pgp_decrypt_part (BODY *a, STATE *s, FILE *fpout, BODY *p) { char buf[LONG_STRING]; FILE *pgpin, *pgpout, *pgperr, *pgptmp; struct stat info; BODY *tattach; int len; char pgperrfile[_POSIX_PATH_MAX]; char pgptmpfile[_POSIX_PATH_MAX]; pid_t thepid; int rv; mutt_mktemp (pgperrfile); if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL) { mutt_perror (pgperrfile); return NULL; } unlink (pgperrfile); mutt_mktemp (pgptmpfile); if((pgptmp = safe_fopen (pgptmpfile, "w")) == NULL) { mutt_perror (pgptmpfile); fclose(pgperr); return NULL; } /* Position the stream at the beginning of the body, and send the data to * the temporary file. */ fseeko (s->fpin, a->offset, 0); mutt_copy_bytes (s->fpin, pgptmp, a->length); fclose (pgptmp); if ((thepid = pgp_invoke_decrypt (&pgpin, &pgpout, NULL, -1, -1, fileno (pgperr), pgptmpfile)) == -1) { fclose (pgperr); unlink (pgptmpfile); if (s->flags & M_DISPLAY) state_attach_puts (_("[-- Error: could not create a PGP subprocess! --]\n\n"), s); return (NULL); } /* send the PGP passphrase to the subprocess. Never do this if the agent is active, because this might lead to a passphrase send as the message. */ if (!pgp_use_gpg_agent()) fputs (PgpPass, pgpin); fputc ('\n', pgpin); fclose(pgpin); /* Read the output from PGP, and make sure to change CRLF to LF, otherwise * read_mime_header has a hard time parsing the message. */ while (fgets (buf, sizeof (buf) - 1, pgpout) != NULL) { len = mutt_strlen (buf); if (len > 1 && buf[len - 2] == '\r') strcpy (buf + len - 2, "\n"); /* __STRCPY_CHECKED__ */ fputs (buf, fpout); } fclose (pgpout); rv = mutt_wait_filter (thepid); mutt_unlink(pgptmpfile); if (s->flags & M_DISPLAY) { fflush (pgperr); rewind (pgperr); if (pgp_copy_checksig (pgperr, s->fpout) == 0 && !rv && p) p->goodsig = 1; else p->goodsig = 0; state_attach_puts (_("[-- End of PGP output --]\n\n"), s); } fclose (pgperr); fflush (fpout); rewind (fpout); if (fgetc (fpout) == EOF) { mutt_error _("Decryption failed"); pgp_void_passphrase (); return NULL; } rewind (fpout); if ((tattach = mutt_read_mime_header (fpout, 0)) != NULL) { /* * Need to set the length of this body part. */ fstat (fileno (fpout), &info); tattach->length = info.st_size - tattach->offset; /* See if we need to recurse on this MIME part. */ mutt_parse_part (fpout, tattach); } return (tattach); } int pgp_decrypt_mime (FILE *fpin, FILE **fpout, BODY *b, BODY **cur) { char tempfile[_POSIX_PATH_MAX]; STATE s; BODY *p = b; if(!mutt_is_multipart_encrypted(b)) return -1; if(!b->parts || !b->parts->next) return -1; b = b->parts->next; memset (&s, 0, sizeof (s)); s.fpin = fpin; mutt_mktemp (tempfile); if ((*fpout = safe_fopen (tempfile, "w+")) == NULL) { mutt_perror (tempfile); return (-1); } unlink (tempfile); *cur = pgp_decrypt_part (b, &s, *fpout, p); rewind (*fpout); if (!*cur) return -1; return (0); } int pgp_encrypted_handler (BODY *a, STATE *s) { char tempfile[_POSIX_PATH_MAX]; FILE *fpout, *fpin; BODY *tattach; BODY *p = a; int rc = 0; a = a->parts; if (!a || a->type != TYPEAPPLICATION || !a->subtype || ascii_strcasecmp ("pgp-encrypted", a->subtype) != 0 || !a->next || a->next->type != TYPEAPPLICATION || !a->next->subtype || ascii_strcasecmp ("octet-stream", a->next->subtype) != 0) { if (s->flags & M_DISPLAY) state_attach_puts (_("[-- Error: malformed PGP/MIME message! --]\n\n"), s); return -1; } /* * Move forward to the application/pgp-encrypted body. */ a = a->next; mutt_mktemp (tempfile); if ((fpout = safe_fopen (tempfile, "w+")) == NULL) { if (s->flags & M_DISPLAY) state_attach_puts (_("[-- Error: could not create temporary file! --]\n"), s); return -1; } if (s->flags & M_DISPLAY) crypt_current_time (s, "PGP"); if ((tattach = pgp_decrypt_part (a, s, fpout, p)) != NULL) { if (s->flags & M_DISPLAY) state_attach_puts (_("[-- The following data is PGP/MIME encrypted --]\n\n"), s); fpin = s->fpin; s->fpin = fpout; rc = mutt_body_handler (tattach, s); s->fpin = fpin; /* * if a multipart/signed is the _only_ sub-part of a * multipart/encrypted, cache signature verification * status. * */ if (mutt_is_multipart_signed (tattach) && !tattach->next) p->goodsig |= tattach->goodsig; if (s->flags & M_DISPLAY) { state_puts ("\n", s); state_attach_puts (_("[-- End of PGP/MIME encrypted data --]\n"), s); } mutt_free_body (&tattach); /* clear 'Invoking...' message, since there's no error */ mutt_message _("PGP message successfully decrypted."); } else { mutt_error _("Could not decrypt PGP message"); /* void the passphrase, even if it's not necessarily the problem */ pgp_void_passphrase (); rc = -1; } fclose (fpout); mutt_unlink(tempfile); return rc; } /* ---------------------------------------------------------------------------- * Routines for sending PGP/MIME messages. */ BODY *pgp_sign_message (BODY *a) { BODY *t; char buffer[LONG_STRING]; char sigfile[_POSIX_PATH_MAX], signedfile[_POSIX_PATH_MAX]; FILE *pgpin, *pgpout, *pgperr, *fp, *sfp; int err = 0; int empty = 1; pid_t thepid; convert_to_7bit (a); /* Signed data _must_ be in 7-bit format. */ mutt_mktemp (sigfile); if ((fp = safe_fopen (sigfile, "w")) == NULL) { return (NULL); } mutt_mktemp (signedfile); if ((sfp = safe_fopen(signedfile, "w")) == NULL) { mutt_perror(signedfile); fclose(fp); unlink(sigfile); return NULL; } mutt_write_mime_header (a, sfp); fputc ('\n', sfp); mutt_write_mime_body (a, sfp); fclose(sfp); if ((thepid = pgp_invoke_sign (&pgpin, &pgpout, &pgperr, -1, -1, -1, signedfile)) == -1) { mutt_perror _("Can't open PGP subprocess!"); fclose(fp); unlink(sigfile); unlink(signedfile); return NULL; } if (!pgp_use_gpg_agent()) fputs(PgpPass, pgpin); fputc('\n', pgpin); fclose(pgpin); /* * Read back the PGP signature. Also, change MESSAGE=>SIGNATURE as * recommended for future releases of PGP. */ while (fgets (buffer, sizeof (buffer) - 1, pgpout) != NULL) { if (mutt_strcmp ("-----BEGIN PGP MESSAGE-----\n", buffer) == 0) fputs ("-----BEGIN PGP SIGNATURE-----\n", fp); else if (mutt_strcmp("-----END PGP MESSAGE-----\n", buffer) == 0) fputs ("-----END PGP SIGNATURE-----\n", fp); else fputs (buffer, fp); empty = 0; /* got some output, so we're ok */ } /* check for errors from PGP */ err = 0; while (fgets (buffer, sizeof (buffer) - 1, pgperr) != NULL) { err = 1; fputs (buffer, stdout); } if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT)) empty=1; fclose (pgperr); fclose (pgpout); unlink (signedfile); if (fclose (fp) != 0) { mutt_perror ("fclose"); unlink (sigfile); return (NULL); } if (err) mutt_any_key_to_continue (NULL); if (empty) { unlink (sigfile); /* most likely error is a bad passphrase, so automatically forget it */ pgp_void_passphrase (); return (NULL); /* fatal error while signing */ } t = mutt_new_body (); t->type = TYPEMULTIPART; t->subtype = safe_strdup ("signed"); t->encoding = ENC7BIT; t->use_disp = 0; t->disposition = DISPINLINE; mutt_generate_boundary (&t->parameter); mutt_set_parameter ("protocol", "application/pgp-signature", &t->parameter); mutt_set_parameter ("micalg", pgp_micalg (sigfile), &t->parameter); t->parts = a; a = t; t->parts->next = mutt_new_body (); t = t->parts->next; t->type = TYPEAPPLICATION; t->subtype = safe_strdup ("pgp-signature"); t->filename = safe_strdup (sigfile); t->use_disp = 0; t->disposition = DISPINLINE; t->encoding = ENC7BIT; t->unlink = 1; /* ok to remove this file after sending. */ return (a); } static short is_numerical_keyid (const char *s) { /* or should we require the "0x"? */ if (strncmp (s, "0x", 2) == 0) s += 2; if (strlen (s) % 8) return 0; while (*s) if (strchr ("0123456789ABCDEFabcdef", *s++) == NULL) return 0; return 1; } /* This routine attempts to find the keyids of the recipients of a message. * It returns NULL if any of the keys can not be found. */ char *pgp_findKeys (ADDRESS *to, ADDRESS *cc, ADDRESS *bcc) { char *keyID, *keylist = NULL, *t; size_t keylist_size = 0; size_t keylist_used = 0; ADDRESS *tmp = NULL, *addr = NULL; ADDRESS **last = &tmp; ADDRESS *p, *q; int i; pgp_key_t k_info = NULL, key = NULL; const char *fqdn = mutt_fqdn (1); for (i = 0; i < 3; i++) { switch (i) { case 0: p = to; break; case 1: p = cc; break; case 2: p = bcc; break; default: abort (); } *last = rfc822_cpy_adr (p); while (*last) last = &((*last)->next); } if (fqdn) rfc822_qualify (tmp, fqdn); tmp = mutt_remove_duplicates (tmp); for (p = tmp; p ; p = p->next) { char buf[LONG_STRING]; q = p; k_info = NULL; if ((keyID = mutt_crypt_hook (p)) != NULL) { int r; snprintf (buf, sizeof (buf), _("Use keyID = \"%s\" for %s?"), keyID, p->mailbox); if ((r = mutt_yesorno (buf, M_YES)) == M_YES) { if (is_numerical_keyid (keyID)) { if (strncmp (keyID, "0x", 2) == 0) keyID += 2; goto bypass_selection; /* you don't see this. */ } /* check for e-mail address */ if ((t = strchr (keyID, '@')) && (addr = rfc822_parse_adrlist (NULL, keyID))) { if (fqdn) rfc822_qualify (addr, fqdn); q = addr; } else k_info = pgp_getkeybystr (keyID, KEYFLAG_CANENCRYPT, PGP_PUBRING); } else if (r == -1) { FREE (&keylist); rfc822_free_address (&tmp); rfc822_free_address (&addr); return NULL; } } if (k_info == NULL) pgp_invoke_getkeys (q); if (k_info == NULL && (k_info = pgp_getkeybyaddr (q, KEYFLAG_CANENCRYPT, PGP_PUBRING)) == NULL) { snprintf (buf, sizeof (buf), _("Enter keyID for %s: "), q->mailbox); if ((key = pgp_ask_for_key (buf, q->mailbox, KEYFLAG_CANENCRYPT, PGP_PUBRING)) == NULL) { FREE (&keylist); rfc822_free_address (&tmp); rfc822_free_address (&addr); return NULL; } } else key = k_info; keyID = pgp_keyid (key); bypass_selection: keylist_size += mutt_strlen (keyID) + 4; safe_realloc (&keylist, keylist_size); sprintf (keylist + keylist_used, "%s0x%s", keylist_used ? " " : "", /* __SPRINTF_CHECKED__ */ keyID); keylist_used = mutt_strlen (keylist); pgp_free_key (&key); rfc822_free_address (&addr); } rfc822_free_address (&tmp); return (keylist); } /* Warning: "a" is no longer freed in this routine, you need * to free it later. This is necessary for $fcc_attach. */ BODY *pgp_encrypt_message (BODY *a, char *keylist, int sign) { char buf[LONG_STRING]; char tempfile[_POSIX_PATH_MAX], pgperrfile[_POSIX_PATH_MAX]; char pgpinfile[_POSIX_PATH_MAX]; FILE *pgpin, *pgperr, *fpout, *fptmp; BODY *t; int err = 0; int empty = 0; pid_t thepid; mutt_mktemp (tempfile); if ((fpout = safe_fopen (tempfile, "w+")) == NULL) { mutt_perror (tempfile); return (NULL); } mutt_mktemp (pgperrfile); if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL) { mutt_perror (pgperrfile); unlink(tempfile); fclose(fpout); return NULL; } unlink (pgperrfile); mutt_mktemp(pgpinfile); if((fptmp = safe_fopen(pgpinfile, "w")) == NULL) { mutt_perror(pgpinfile); unlink(tempfile); fclose(fpout); fclose(pgperr); return NULL; } if (sign) convert_to_7bit (a); mutt_write_mime_header (a, fptmp); fputc ('\n', fptmp); mutt_write_mime_body (a, fptmp); fclose(fptmp); if ((thepid = pgp_invoke_encrypt (&pgpin, NULL, NULL, -1, fileno (fpout), fileno (pgperr), pgpinfile, keylist, sign)) == -1) { fclose (pgperr); unlink(pgpinfile); return (NULL); } if (sign) { if (!pgp_use_gpg_agent()) fputs (PgpPass, pgpin); fputc ('\n', pgpin); } fclose(pgpin); if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT)) empty=1; unlink(pgpinfile); fflush (fpout); rewind (fpout); if(!empty) empty = (fgetc (fpout) == EOF); fclose (fpout); fflush (pgperr); rewind (pgperr); while (fgets (buf, sizeof (buf) - 1, pgperr) != NULL) { err = 1; fputs (buf, stdout); } fclose (pgperr); /* pause if there is any error output from PGP */ if (err) mutt_any_key_to_continue (NULL); if (empty) { /* fatal error while trying to encrypt message */ if (sign) pgp_void_passphrase (); /* just in case */ unlink (tempfile); return (NULL); } t = mutt_new_body (); t->type = TYPEMULTIPART; t->subtype = safe_strdup ("encrypted"); t->encoding = ENC7BIT; t->use_disp = 0; t->disposition = DISPINLINE; mutt_generate_boundary(&t->parameter); mutt_set_parameter("protocol", "application/pgp-encrypted", &t->parameter); t->parts = mutt_new_body (); t->parts->type = TYPEAPPLICATION; t->parts->subtype = safe_strdup ("pgp-encrypted"); t->parts->encoding = ENC7BIT; t->parts->next = mutt_new_body (); t->parts->next->type = TYPEAPPLICATION; t->parts->next->subtype = safe_strdup ("octet-stream"); t->parts->next->encoding = ENC7BIT; t->parts->next->filename = safe_strdup (tempfile); t->parts->next->use_disp = 1; t->parts->next->disposition = DISPINLINE; t->parts->next->unlink = 1; /* delete after sending the message */ t->parts->next->d_filename = safe_strdup ("msg.asc"); /* non pgp/mime can save */ return (t); } BODY *pgp_traditional_encryptsign (BODY *a, int flags, char *keylist) { BODY *b; char pgpoutfile[_POSIX_PATH_MAX]; char pgperrfile[_POSIX_PATH_MAX]; char pgpinfile[_POSIX_PATH_MAX]; char body_charset[STRING]; char *from_charset; const char *send_charset; FILE *pgpout = NULL, *pgperr = NULL, *pgpin = NULL; FILE *fp; int empty = 0; int err; char buff[STRING]; pid_t thepid; if (a->type != TYPETEXT) return NULL; if (ascii_strcasecmp (a->subtype, "plain")) return NULL; if ((fp = fopen (a->filename, "r")) == NULL) { mutt_perror (a->filename); return NULL; } mutt_mktemp (pgpinfile); if ((pgpin = safe_fopen (pgpinfile, "w")) == NULL) { mutt_perror (pgpinfile); fclose (fp); return NULL; } /* The following code is really correct: If noconv is set, * a's charset parameter contains the on-disk character set, and * we have to convert from that to utf-8. If noconv is not set, * we have to convert from $charset to utf-8. */ mutt_get_body_charset (body_charset, sizeof (body_charset), a); if (a->noconv) from_charset = body_charset; else from_charset = Charset; if (!mutt_is_us_ascii (body_charset)) { int c; FGETCONV *fc; if (flags & ENCRYPT) send_charset = "us-ascii"; else send_charset = "utf-8"; /* fromcode is assumed to be correct: we set flags to 0 */ fc = fgetconv_open (fp, from_charset, "utf-8", 0); while ((c = fgetconv (fc)) != EOF) fputc (c, pgpin); fgetconv_close (&fc); } else { send_charset = "us-ascii"; mutt_copy_stream (fp, pgpin); } safe_fclose (&fp); fclose (pgpin); mutt_mktemp (pgpoutfile); mutt_mktemp (pgperrfile); if ((pgpout = safe_fopen (pgpoutfile, "w+")) == NULL || (pgperr = safe_fopen (pgperrfile, "w+")) == NULL) { mutt_perror (pgpout ? pgperrfile : pgpoutfile); unlink (pgpinfile); if (pgpout) { fclose (pgpout); unlink (pgpoutfile); } return NULL; } unlink (pgperrfile); if ((thepid = pgp_invoke_traditional (&pgpin, NULL, NULL, -1, fileno (pgpout), fileno (pgperr), pgpinfile, keylist, flags)) == -1) { mutt_perror _("Can't invoke PGP"); fclose (pgpout); fclose (pgperr); mutt_unlink (pgpinfile); unlink (pgpoutfile); return NULL; } if (pgp_use_gpg_agent()) *PgpPass = 0; if (flags & SIGN) fprintf (pgpin, "%s\n", PgpPass); fclose (pgpin); if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT)) empty=1; mutt_unlink (pgpinfile); fflush (pgpout); fflush (pgperr); rewind (pgpout); rewind (pgperr); if(!empty) empty = (fgetc (pgpout) == EOF); fclose (pgpout); err = 0; while (fgets (buff, sizeof (buff), pgperr)) { err = 1; fputs (buff, stdout); } fclose (pgperr); if (err) mutt_any_key_to_continue (NULL); if (empty) { if (flags & SIGN) pgp_void_passphrase (); /* just in case */ unlink (pgpoutfile); return NULL; } b = mutt_new_body (); b->encoding = ENC7BIT; b->type = TYPETEXT; b->subtype = safe_strdup ("plain"); mutt_set_parameter ("x-action", flags & ENCRYPT ? "pgp-encrypted" : "pgp-signed", &b->parameter); mutt_set_parameter ("charset", send_charset, &b->parameter); b->filename = safe_strdup (pgpoutfile); #if 0 /* The following is intended to give a clue to some completely brain-dead * "mail environments" which are typically used by large corporations. */ b->d_filename = safe_strdup ("msg.pgp"); b->use_disp = 1; #endif b->disposition = DISPINLINE; b->unlink = 1; b->noconv = 1; b->use_disp = 0; if (!(flags & ENCRYPT)) b->encoding = a->encoding; return b; } int pgp_send_menu (HEADER *msg, int *redraw) { pgp_key_t p; char input_signas[SHORT_STRING]; char prompt[LONG_STRING]; if (!(WithCrypto & APPLICATION_PGP)) return msg->security; /* If autoinline and no crypto options set, then set inline. */ if (option (OPTPGPAUTOINLINE) && !((msg->security & APPLICATION_PGP) && (msg->security & (SIGN|ENCRYPT)))) msg->security |= INLINE; snprintf (prompt, sizeof (prompt), _("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, %s, or (c)lear? "), (msg->security & INLINE) ? _("PGP/M(i)ME") : _("(i)nline")); switch (mutt_multi_choice (prompt, _("esabifc"))) { case 1: /* (e)ncrypt */ msg->security |= ENCRYPT; msg->security &= ~SIGN; break; case 2: /* (s)ign */ msg->security |= SIGN; msg->security &= ~ENCRYPT; break; case 3: /* sign (a)s */ unset_option(OPTPGPCHECKTRUST); if ((p = pgp_ask_for_key (_("Sign as: "), NULL, KEYFLAG_CANSIGN, PGP_PUBRING))) { snprintf (input_signas, sizeof (input_signas), "0x%s", pgp_keyid (p)); mutt_str_replace (&PgpSignAs, input_signas); pgp_free_key (&p); msg->security |= SIGN; crypt_pgp_void_passphrase (); /* probably need a different passphrase */ } #if 0 else { msg->security &= ~SIGN; } #endif *redraw = REDRAW_FULL; break; case 4: /* (b)oth */ msg->security |= (ENCRYPT | SIGN); break; case 5: /* (i)nline */ if ((msg->security & (ENCRYPT | SIGN))) msg->security ^= INLINE; else msg->security &= ~INLINE; break; case 6: /* (f)orget it */ case 7: /* (c)lear */ msg->security = 0; break; } if (msg->security) { if (! (msg->security & (ENCRYPT | SIGN))) msg->security = 0; else msg->security |= APPLICATION_PGP; } return (msg->security); } #endif /* CRYPT_BACKEND_CLASSIC_PGP */