/* * Copyright (C) 1996,1997 Michael R. Elkins * Copyright (C) 1999-2000 Thomas Roessler * Copyright (C) 2001 Thomas Roessler * Oliver Ehli * Copyright (C) 2003 Werner Koch * Copyright (C) 2004 g10code 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. */ #if HAVE_CONFIG_H # include "config.h" #endif #include "mutt.h" #include "mutt_curses.h" #include "mime.h" #include "copy.h" #include "mutt_crypt.h" #include "pgp.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 /* print the current time to avoid spoofing of the signature output */ void crypt_current_time(STATE *s, char *app_name) { time_t t; char p[STRING], tmp[STRING]; if (!WithCrypto) return; if (option (OPTCRYPTTIMESTAMP)) { t = time(NULL); setlocale (LC_TIME, ""); strftime (p, sizeof (p), _(" (current time: %c)"), localtime (&t)); setlocale (LC_TIME, "C"); } else *p = '\0'; snprintf (tmp, sizeof (tmp), _("[-- %s output follows%s --]\n"), NONULL(app_name), p); state_attach_puts (tmp, s); } void crypt_forget_passphrase (void) { if ((WithCrypto & APPLICATION_PGP)) crypt_pgp_void_passphrase (); if ((WithCrypto & APPLICATION_SMIME)) crypt_smime_void_passphrase (); if (WithCrypto) mutt_message _("Passphrase(s) forgotten."); } #if defined(HAVE_SETRLIMIT) && (!defined(DEBUG)) static void disable_coredumps (void) { struct rlimit rl = {0, 0}; static short done = 0; if (!done) { setrlimit (RLIMIT_CORE, &rl); done = 1; } } #endif /* HAVE_SETRLIMIT */ int crypt_valid_passphrase(int flags) { int ret = 0; # if defined(HAVE_SETRLIMIT) &&(!defined(DEBUG)) disable_coredumps (); # endif if ((WithCrypto & APPLICATION_PGP) && (flags & APPLICATION_PGP)) ret = crypt_pgp_valid_passphrase (); if ((WithCrypto & APPLICATION_SMIME) && (flags & APPLICATION_SMIME)) ret = crypt_smime_valid_passphrase (); return ret; } int mutt_protect (HEADER *msg, char *keylist) { BODY *pbody = NULL, *tmp_pbody = NULL; BODY *tmp_smime_pbody = NULL; BODY *tmp_pgp_pbody = NULL; int flags = (WithCrypto & APPLICATION_PGP)? msg->security: 0; int i; if (!WithCrypto) return -1; if ((msg->security & SIGN) && !crypt_valid_passphrase (msg->security)) return (-1); if ((WithCrypto & APPLICATION_PGP) && ((msg->security & PGPINLINE) == PGPINLINE)) { /* they really want to send it inline... go for it */ if (!isendwin ()) mutt_endwin _("Invoking PGP..."); pbody = crypt_pgp_traditional_encryptsign (msg->content, flags, keylist); if (pbody) { msg->content = pbody; return 0; } /* otherwise inline won't work...ask for revert */ if ((i = query_quadoption (OPT_PGPMIMEAUTO, _("Message can't be sent inline. Revert to using PGP/MIME?"))) != M_YES) { mutt_error _("Mail not sent."); return -1; } /* go ahead with PGP/MIME */ } if (!isendwin ()) mutt_endwin (NULL); if ((WithCrypto & APPLICATION_SMIME)) tmp_smime_pbody = msg->content; if ((WithCrypto & APPLICATION_PGP)) tmp_pgp_pbody = msg->content; if (option (OPTCRYPTUSEPKA) && (msg->security & SIGN)) { /* Set sender (necessary for e.g. PKA). */ if ((WithCrypto & APPLICATION_SMIME) && (msg->security & APPLICATION_SMIME)) crypt_smime_set_sender (msg->env->from->mailbox); else if ((WithCrypto & APPLICATION_PGP) && (msg->security & APPLICATION_PGP)) crypt_pgp_set_sender (msg->env->from->mailbox); } if (msg->security & SIGN) { if ((WithCrypto & APPLICATION_SMIME) && (msg->security & APPLICATION_SMIME)) { if (!(tmp_pbody = crypt_smime_sign_message (msg->content))) return -1; pbody = tmp_smime_pbody = tmp_pbody; } if ((WithCrypto & APPLICATION_PGP) && (msg->security & APPLICATION_PGP) && (!(flags & ENCRYPT) || option (OPTPGPRETAINABLESIG))) { if (!(tmp_pbody = crypt_pgp_sign_message (msg->content))) return -1; flags &= ~SIGN; pbody = tmp_pgp_pbody = tmp_pbody; } if (WithCrypto && (msg->security & APPLICATION_SMIME) && (msg->security & APPLICATION_PGP)) { /* here comes the draft ;-) */ } } if (msg->security & ENCRYPT) { if ((WithCrypto & APPLICATION_SMIME) && (msg->security & APPLICATION_SMIME)) { if (!(tmp_pbody = crypt_smime_build_smime_entity (tmp_smime_pbody, keylist))) { /* signed ? free it! */ return (-1); } /* free tmp_body if messages was signed AND encrypted ... */ if (tmp_smime_pbody != msg->content && tmp_smime_pbody != tmp_pbody) { /* detatch and dont't delete msg->content, which tmp_smime_pbody->parts after signing. */ tmp_smime_pbody->parts = tmp_smime_pbody->parts->next; msg->content->next = NULL; mutt_free_body (&tmp_smime_pbody); } pbody = tmp_pbody; } if ((WithCrypto & APPLICATION_PGP) && (msg->security & APPLICATION_PGP)) { if (!(pbody = crypt_pgp_encrypt_message (tmp_pgp_pbody, keylist, flags & SIGN))) { /* did we perform a retainable signature? */ if (flags != msg->security) { /* remove the outer multipart layer */ tmp_pgp_pbody = mutt_remove_multipart (tmp_pgp_pbody); /* get rid of the signature */ mutt_free_body (&tmp_pgp_pbody->next); } return (-1); } /* destroy temporary signature envelope when doing retainable * signatures. */ if (flags != msg->security) { tmp_pgp_pbody = mutt_remove_multipart (tmp_pgp_pbody); mutt_free_body (&tmp_pgp_pbody->next); } } } if(pbody) msg->content = pbody; return 0; } int mutt_is_multipart_signed (BODY *b) { char *p; if (!b || !(b->type == TYPEMULTIPART) || !b->subtype || ascii_strcasecmp(b->subtype, "signed")) return 0; if (!(p = mutt_get_parameter("protocol", b->parameter))) return 0; if (!(ascii_strcasecmp (p, "multipart/mixed"))) return SIGN; if ((WithCrypto & APPLICATION_PGP) && !(ascii_strcasecmp (p, "application/pgp-signature"))) return PGPSIGN; if ((WithCrypto & APPLICATION_SMIME) && !(ascii_strcasecmp (p, "application/x-pkcs7-signature"))) return SMIMESIGN; if ((WithCrypto & APPLICATION_SMIME) && !(ascii_strcasecmp (p, "application/pkcs7-signature"))) return SMIMESIGN; return 0; } int mutt_is_multipart_encrypted (BODY *b) { if ((WithCrypto & APPLICATION_PGP)) { char *p; if (!b || b->type != TYPEMULTIPART || !b->subtype || ascii_strcasecmp (b->subtype, "encrypted") || !(p = mutt_get_parameter ("protocol", b->parameter)) || ascii_strcasecmp (p, "application/pgp-encrypted")) return 0; return PGPENCRYPT; } return 0; } int mutt_is_application_pgp (BODY *m) { int t = 0; char *p; if (m->type == TYPEAPPLICATION) { if (!ascii_strcasecmp (m->subtype, "pgp") || !ascii_strcasecmp (m->subtype, "x-pgp-message")) { if ((p = mutt_get_parameter ("x-action", m->parameter)) && (!ascii_strcasecmp (p, "sign") || !ascii_strcasecmp (p, "signclear"))) t |= PGPSIGN; if ((p = mutt_get_parameter ("format", m->parameter)) && !ascii_strcasecmp (p, "keys-only")) t |= PGPKEY; if(!t) t |= PGPENCRYPT; /* not necessarily correct, but... */ } if (!ascii_strcasecmp (m->subtype, "pgp-signed")) t |= PGPSIGN; if (!ascii_strcasecmp (m->subtype, "pgp-keys")) t |= PGPKEY; } else if (m->type == TYPETEXT && ascii_strcasecmp ("plain", m->subtype) == 0) { if (((p = mutt_get_parameter ("x-mutt-action", m->parameter)) || (p = mutt_get_parameter ("x-action", m->parameter)) || (p = mutt_get_parameter ("action", m->parameter))) && !ascii_strncasecmp ("pgp-sign", p, 8)) t |= PGPSIGN; else if (p && !ascii_strncasecmp ("pgp-encrypt", p, 11)) t |= PGPENCRYPT; else if (p && !ascii_strncasecmp ("pgp-keys", p, 7)) t |= PGPKEY; } if (t) t |= PGPINLINE; return t; } int mutt_is_application_smime (BODY *m) { char *t=NULL; int len, complain=0; if(!m) return 0; if ((m->type & TYPEAPPLICATION) && m->subtype) { /* S/MIME MIME types don't need x- anymore, see RFC2311 */ if (!ascii_strcasecmp (m->subtype, "x-pkcs7-mime") || !ascii_strcasecmp (m->subtype, "pkcs7-mime")) { if ((t = mutt_get_parameter ("smime-type", m->parameter))) { if (!ascii_strcasecmp (t, "enveloped-data")) return SMIMEENCRYPT; else if (!ascii_strcasecmp (t, "signed-data")) return (SMIMESIGN|SMIMEOPAQUE); else return 0; } /* Netscape 4.7 uses * Content-Description: S/MIME Encrypted Message * instead of Content-Type parameter */ if (!ascii_strcasecmp (m->description, "S/MIME Encrypted Message")) return SMIMEENCRYPT; complain = 1; } else if (ascii_strcasecmp (m->subtype, "octet-stream")) return 0; t = mutt_get_parameter ("name", m->parameter); if (!t) t = m->d_filename; if (!t) t = m->filename; if (!t) { if (complain) mutt_message (_("S/MIME messages with no hints on content are unsupported.")); return 0; } /* no .p7c, .p10 support yet. */ len = mutt_strlen (t) - 4; if (len > 0 && *(t+len) == '.') { len++; if (!ascii_strcasecmp ((t+len), "p7m")) #if 0 return SMIMEENCRYPT; #else /* Not sure if this is the correct thing to do, but it's required for compatibility with Outlook */ return (SMIMESIGN|SMIMEOPAQUE); #endif else if (!ascii_strcasecmp ((t+len), "p7s")) return (SMIMESIGN|SMIMEOPAQUE); } } return 0; } int crypt_query (BODY *m) { int t = 0; if (!WithCrypto) return 0; if (!m) return 0; if (m->type == TYPEAPPLICATION) { if ((WithCrypto & APPLICATION_PGP)) t |= mutt_is_application_pgp(m); if ((WithCrypto & APPLICATION_SMIME)) { t |= mutt_is_application_smime(m); if (t && m->goodsig) t |= GOODSIGN; if (t && m->badsig) t |= BADSIGN; } } else if ((WithCrypto & APPLICATION_PGP) && m->type == TYPETEXT) { t |= mutt_is_application_pgp (m); if (t && m->goodsig) t |= GOODSIGN; } if (m->type == TYPEMULTIPART) { t |= mutt_is_multipart_encrypted(m); t |= mutt_is_multipart_signed (m); if (t && m->goodsig) t |= GOODSIGN; } if (m->type == TYPEMULTIPART || m->type == TYPEMESSAGE) { BODY *p; int u, v, w; u = m->parts ? 0xffffffff : 0; /* Bits set in all parts */ w = 0; /* Bits set in any part */ for (p = m->parts; p; p = p->next) { v = crypt_query (p); u &= v; w |= v; } t |= u | (w & ~GOODSIGN); if ((w & GOODSIGN) && !(u & GOODSIGN)) t |= PARTSIGN; } return t; } int crypt_write_signed(BODY *a, STATE *s, const char *tempfile) { FILE *fp; int c; short hadcr; size_t bytes; if (!WithCrypto) return -1; if (!(fp = safe_fopen (tempfile, "w"))) { mutt_perror (tempfile); return -1; } fseeko (s->fpin, a->hdr_offset, 0); bytes = a->length + a->offset - a->hdr_offset; hadcr = 0; while (bytes > 0) { if ((c = fgetc (s->fpin)) == EOF) break; bytes--; if (c == '\r') hadcr = 1; else { if (c == '\n' && !hadcr) fputc ('\r', fp); hadcr = 0; } fputc (c, fp); } fclose (fp); return 0; } void convert_to_7bit (BODY *a) { if (!WithCrypto) return; while (a) { if (a->type == TYPEMULTIPART) { if (a->encoding != ENC7BIT) { a->encoding = ENC7BIT; convert_to_7bit(a->parts); } else if ((WithCrypto & APPLICATION_PGP) && option (OPTPGPSTRICTENC)) convert_to_7bit (a->parts); } else if (a->type == TYPEMESSAGE && ascii_strcasecmp(a->subtype, "delivery-status")) { if(a->encoding != ENC7BIT) mutt_message_to_7bit (a, NULL); } else if (a->encoding == ENC8BIT) a->encoding = ENCQUOTEDPRINTABLE; else if (a->encoding == ENCBINARY) a->encoding = ENCBASE64; else if (a->content && a->encoding != ENCBASE64 && (a->content->from || (a->content->space && option (OPTPGPSTRICTENC)))) a->encoding = ENCQUOTEDPRINTABLE; a = a->next; } } void crypt_extract_keys_from_messages (HEADER * h) { int i; char tempfname[_POSIX_PATH_MAX], *mbox; ADDRESS *tmp = NULL; FILE *fpout; if (!WithCrypto) return; mutt_mktemp (tempfname); if (!(fpout = safe_fopen (tempfname, "w"))) { mutt_perror (tempfname); return; } if ((WithCrypto & APPLICATION_PGP)) 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 & ENCRYPT && !crypt_valid_passphrase (Context->hdrs[Context->v2r[i]]->security)) { fclose (fpout); break; } if ((WithCrypto & APPLICATION_PGP) && (Context->hdrs[Context->v2r[i]]->security & APPLICATION_PGP)) { mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]], M_CM_DECODE|M_CM_CHARCONV, 0); fflush(fpout); mutt_endwin (_("Trying to extract PGP keys...\n")); crypt_pgp_invoke_import (tempfname); } if ((WithCrypto & APPLICATION_SMIME) && (Context->hdrs[Context->v2r[i]]->security & APPLICATION_SMIME)) { if (Context->hdrs[Context->v2r[i]]->security & ENCRYPT) mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]], M_CM_NOHEADER|M_CM_DECODE_CRYPT |M_CM_DECODE_SMIME, 0); else mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]], 0, 0); fflush(fpout); if (Context->hdrs[Context->v2r[i]]->env->from) tmp = mutt_expand_aliases (Context->hdrs[Context->v2r[i]]->env->from); else if (Context->hdrs[Context->v2r[i]]->env->sender) tmp = mutt_expand_aliases (Context->hdrs[Context->v2r[i]] ->env->sender); mbox = tmp ? tmp->mailbox : NULL; if (mbox) { mutt_endwin (_("Trying to extract S/MIME certificates...\n")); crypt_smime_invoke_import (tempfname, mbox); tmp = NULL; } } rewind (fpout); } } } else { mutt_parse_mime_message (Context, h); if (!(h->security & ENCRYPT && !crypt_valid_passphrase (h->security))) { if ((WithCrypto & APPLICATION_PGP) && (h->security & APPLICATION_PGP)) { mutt_copy_message (fpout, Context, h, M_CM_DECODE|M_CM_CHARCONV, 0); fflush(fpout); mutt_endwin (_("Trying to extract PGP keys...\n")); crypt_pgp_invoke_import (tempfname); } if ((WithCrypto & APPLICATION_SMIME) && (h->security & APPLICATION_SMIME)) { if (h->security & ENCRYPT) mutt_copy_message (fpout, Context, h, M_CM_NOHEADER |M_CM_DECODE_CRYPT |M_CM_DECODE_SMIME, 0); else mutt_copy_message (fpout, Context, h, 0, 0); fflush(fpout); if (h->env->from) tmp = mutt_expand_aliases (h->env->from); else if (h->env->sender) tmp = mutt_expand_aliases (h->env->sender); mbox = tmp ? tmp->mailbox : NULL; if (mbox) /* else ? */ { mutt_message (_("Trying to extract S/MIME certificates...\n")); crypt_smime_invoke_import (tempfname, mbox); } } } } fclose (fpout); if (isendwin()) mutt_any_key_to_continue (NULL); mutt_unlink (tempfname); if ((WithCrypto & APPLICATION_PGP)) unset_option (OPTDONTHANDLEPGPKEYS); } int crypt_get_keys (HEADER *msg, char **keylist) { /* Do a quick check to make sure that we can find all of the encryption * keys if the user has requested this service. */ if (!WithCrypto) return 0; if ((WithCrypto & APPLICATION_PGP)) set_option (OPTPGPCHECKTRUST); *keylist = NULL; if (msg->security & ENCRYPT) { if ((WithCrypto & APPLICATION_PGP) && (msg->security & APPLICATION_PGP)) { if ((*keylist = crypt_pgp_findkeys (msg->env->to, msg->env->cc, msg->env->bcc)) == NULL) return (-1); unset_option (OPTPGPCHECKTRUST); } if ((WithCrypto & APPLICATION_SMIME) && (msg->security & APPLICATION_SMIME)) { if ((*keylist = crypt_smime_findkeys (msg->env->to, msg->env->cc, msg->env->bcc)) == NULL) return (-1); } } return (0); } static void crypt_fetch_signatures (BODY ***signatures, BODY *a, int *n) { if (!WithCrypto) return; for (; a; a = a->next) { if (a->type == TYPEMULTIPART) crypt_fetch_signatures (signatures, a->parts, n); else { if((*n % 5) == 0) safe_realloc (signatures, (*n + 6) * sizeof (BODY **)); (*signatures)[(*n)++] = a; } } } /* * This routine verifies a "multipart/signed" body. */ int mutt_signed_handler (BODY *a, STATE *s) { char tempfile[_POSIX_PATH_MAX]; char *protocol; int protocol_major = TYPEOTHER; char *protocol_minor = NULL; BODY *b = a; BODY **signatures = NULL; int sigcnt = 0; int i; short goodsig = 1; int rc = 0; if (!WithCrypto) return -1; protocol = mutt_get_parameter ("protocol", a->parameter); a = a->parts; /* extract the protocol information */ if (protocol) { char major[STRING]; char *t; if ((protocol_minor = strchr (protocol, '/'))) protocol_minor++; strfcpy (major, protocol, sizeof(major)); if((t = strchr(major, '/'))) *t = '\0'; protocol_major = mutt_check_mime_type (major); } /* consistency check */ if (!(a && a->next && a->next->type == protocol_major && !mutt_strcasecmp (a->next->subtype, protocol_minor))) { state_attach_puts (_("[-- Error: " "Inconsistent multipart/signed structure! --]\n\n"), s); return mutt_body_handler (a, s); } if ((WithCrypto & APPLICATION_PGP) && protocol_major == TYPEAPPLICATION && !ascii_strcasecmp (protocol_minor, "pgp-signature")) ; else if ((WithCrypto & APPLICATION_SMIME) && protocol_major == TYPEAPPLICATION && !(ascii_strcasecmp (protocol_minor, "x-pkcs7-signature") && ascii_strcasecmp (protocol_minor, "pkcs7-signature"))) ; else if (protocol_major == TYPEMULTIPART && !ascii_strcasecmp (protocol_minor, "mixed")) ; else { state_printf (s, _("[-- Error: " "Unknown multipart/signed protocol %s! --]\n\n"), protocol); return mutt_body_handler (a, s); } if (s->flags & M_DISPLAY) { crypt_fetch_signatures (&signatures, a->next, &sigcnt); if (sigcnt) { mutt_mktemp (tempfile); if (crypt_write_signed (a, s, tempfile) == 0) { for (i = 0; i < sigcnt; i++) { if ((WithCrypto & APPLICATION_PGP) && signatures[i]->type == TYPEAPPLICATION && !ascii_strcasecmp (signatures[i]->subtype, "pgp-signature")) { if (crypt_pgp_verify_one (signatures[i], s, tempfile) != 0) goodsig = 0; continue; } if ((WithCrypto & APPLICATION_SMIME) && signatures[i]->type == TYPEAPPLICATION && (!ascii_strcasecmp(signatures[i]->subtype, "x-pkcs7-signature") || !ascii_strcasecmp(signatures[i]->subtype, "pkcs7-signature"))) { if (crypt_smime_verify_one (signatures[i], s, tempfile) != 0) goodsig = 0; continue; } state_printf (s, _("[-- Warning: " "We can't verify %s/%s signatures. --]\n\n"), TYPE(signatures[i]), signatures[i]->subtype); } } mutt_unlink (tempfile); b->goodsig = goodsig; b->badsig = !goodsig; /* Now display the signed body */ state_attach_puts (_("[-- The following data is signed --]\n\n"), s); FREE (&signatures); } else state_attach_puts (_("[-- Warning: Can't find any signatures. --]\n\n"), s); } rc = mutt_body_handler (a, s); if (s->flags & M_DISPLAY && sigcnt) state_attach_puts (_("\n[-- End of signed data --]\n"), s); return rc; }