diff --git a/g10/pubkey-enc.c b/g10/pubkey-enc.c index 272562b18..d7ba95391 100644 --- a/g10/pubkey-enc.c +++ b/g10/pubkey-enc.c @@ -1,480 +1,486 @@ /* pubkey-enc.c - Process a public key encoded packet. * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2006, 2009, * 2010 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG 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 3 of the License, or * (at your option) any later version. * * GnuPG 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 . */ #include #include #include #include #include "gpg.h" #include "../common/util.h" #include "packet.h" #include "keydb.h" #include "trustdb.h" #include "../common/status.h" #include "options.h" #include "main.h" #include "../common/i18n.h" #include "pkglue.h" #include "call-agent.h" #include "../common/host2net.h" #include "../common/compliance.h" static gpg_error_t get_it (ctrl_t ctrl, PKT_pubkey_enc *k, DEK *dek, PKT_public_key *sk, u32 *keyid); /* Check that the given algo is mentioned in one of the valid user-ids. */ static int is_algo_in_prefs (kbnode_t keyblock, preftype_t type, int algo) { kbnode_t k; for (k = keyblock; k; k = k->next) { if (k->pkt->pkttype == PKT_USER_ID) { PKT_user_id *uid = k->pkt->pkt.user_id; prefitem_t *prefs = uid->prefs; if (uid->created && prefs && !uid->flags.revoked && !uid->flags.expired) { for (; prefs->type; prefs++) if (prefs->type == type && prefs->value == algo) return 1; } } } return 0; } /* * Get the session key from a pubkey enc packet and return it in DEK, * which should have been allocated in secure memory by the caller. */ gpg_error_t get_session_key (ctrl_t ctrl, PKT_pubkey_enc * k, DEK * dek) { PKT_public_key *sk = NULL; int rc; if (DBG_CLOCK) log_clock ("get_session_key enter"); rc = openpgp_pk_test_algo2 (k->pubkey_algo, PUBKEY_USAGE_ENC); if (rc) goto leave; if ((k->keyid[0] || k->keyid[1]) && !opt.try_all_secrets) { sk = xmalloc_clear (sizeof *sk); sk->pubkey_algo = k->pubkey_algo; /* We want a pubkey with this algo. */ if (!(rc = get_seckey (ctrl, sk, k->keyid))) { - /* Print compliance warning. */ - if (!gnupg_pk_is_compliant (opt.compliance, - sk->pubkey_algo, - sk->pkey, nbits_from_pk (sk), NULL)) - log_info (_("Note: key %s is not suitable for encryption" - " in %s mode\n"), - keystr_from_pk (sk), - gnupg_compliance_option_string (opt.compliance)); - - rc = get_it (ctrl, k, dek, sk, k->keyid); + /* Check compliance. */ + if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_DECRYPTION, + sk->pubkey_algo, + sk->pkey, nbits_from_pk (sk), NULL)) + { + log_info (_("key %s is not suitable for decryption" + " in %s mode\n"), + keystr_from_pk (sk), + gnupg_compliance_option_string (opt.compliance)); + rc = gpg_error (GPG_ERR_PUBKEY_ALGO); + } + else + rc = get_it (ctrl, k, dek, sk, k->keyid); } } else if (opt.skip_hidden_recipients) rc = gpg_error (GPG_ERR_NO_SECKEY); else /* Anonymous receiver: Try all available secret keys. */ { void *enum_context = NULL; u32 keyid[2]; for (;;) { free_public_key (sk); sk = xmalloc_clear (sizeof *sk); rc = enum_secret_keys (ctrl, &enum_context, sk); if (rc) { rc = GPG_ERR_NO_SECKEY; break; } if (sk->pubkey_algo != k->pubkey_algo) continue; if (!(sk->pubkey_usage & PUBKEY_USAGE_ENC)) continue; keyid_from_pk (sk, keyid); if (!opt.quiet) log_info (_("anonymous recipient; trying secret key %s ...\n"), keystr (keyid)); - /* Print compliance warning. */ - if (!gnupg_pk_is_compliant (opt.compliance, - sk->pubkey_algo, - sk->pkey, nbits_from_pk (sk), NULL)) - log_info (_("Note: key %s is not suitable for encryption" - " in %s mode\n"), - keystr_from_pk (sk), - gnupg_compliance_option_string (opt.compliance)); + /* Check compliance. */ + if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_DECRYPTION, + sk->pubkey_algo, + sk->pkey, nbits_from_pk (sk), NULL)) + { + log_info (_("key %s is not suitable for decryption" + " in %s mode\n"), + keystr_from_pk (sk), + gnupg_compliance_option_string (opt.compliance)); + continue; + } rc = get_it (ctrl, k, dek, sk, keyid); if (!rc) { if (!opt.quiet) log_info (_("okay, we are the anonymous recipient.\n")); break; } else if (gpg_err_code (rc) == GPG_ERR_FULLY_CANCELED) break; /* Don't try any more secret keys. */ } enum_secret_keys (ctrl, &enum_context, NULL); /* free context */ } leave: free_public_key (sk); if (DBG_CLOCK) log_clock ("get_session_key leave"); return rc; } static gpg_error_t get_it (ctrl_t ctrl, PKT_pubkey_enc *enc, DEK *dek, PKT_public_key *sk, u32 *keyid) { gpg_error_t err; byte *frame = NULL; unsigned int n; size_t nframe; u16 csum, csum2; int padding; gcry_sexp_t s_data; char *desc; char *keygrip; byte fp[MAX_FINGERPRINT_LEN]; size_t fpn; if (DBG_CLOCK) log_clock ("decryption start"); /* Get the keygrip. */ err = hexkeygrip_from_pk (sk, &keygrip); if (err) goto leave; /* Convert the data to an S-expression. */ if (sk->pubkey_algo == PUBKEY_ALGO_ELGAMAL || sk->pubkey_algo == PUBKEY_ALGO_ELGAMAL_E) { if (!enc->data[0] || !enc->data[1]) err = gpg_error (GPG_ERR_BAD_MPI); else err = gcry_sexp_build (&s_data, NULL, "(enc-val(elg(a%m)(b%m)))", enc->data[0], enc->data[1]); } else if (sk->pubkey_algo == PUBKEY_ALGO_RSA || sk->pubkey_algo == PUBKEY_ALGO_RSA_E) { if (!enc->data[0]) err = gpg_error (GPG_ERR_BAD_MPI); else err = gcry_sexp_build (&s_data, NULL, "(enc-val(rsa(a%m)))", enc->data[0]); } else if (sk->pubkey_algo == PUBKEY_ALGO_ECDH) { if (!enc->data[0] || !enc->data[1]) err = gpg_error (GPG_ERR_BAD_MPI); else err = gcry_sexp_build (&s_data, NULL, "(enc-val(ecdh(s%m)(e%m)))", enc->data[1], enc->data[0]); } else err = gpg_error (GPG_ERR_BUG); if (err) goto leave; if (sk->pubkey_algo == PUBKEY_ALGO_ECDH) { fingerprint_from_pk (sk, fp, &fpn); log_assert (fpn == 20); } /* Decrypt. */ desc = gpg_format_keydesc (ctrl, sk, FORMAT_KEYDESC_NORMAL, 1); err = agent_pkdecrypt (NULL, keygrip, desc, sk->keyid, sk->main_keyid, sk->pubkey_algo, s_data, &frame, &nframe, &padding); xfree (desc); gcry_sexp_release (s_data); if (err) goto leave; /* Now get the DEK (data encryption key) from the frame * * Old versions encode the DEK in this format (msb is left): * * 0 1 DEK(16 bytes) CSUM(2 bytes) 0 RND(n bytes) 2 * * Later versions encode the DEK like this: * * 0 2 RND(n bytes) 0 A DEK(k bytes) CSUM(2 bytes) * * (mpi_get_buffer already removed the leading zero). * * RND are non-zero randow bytes. * A is the cipher algorithm * DEK is the encryption key (session key) with length k * CSUM */ if (DBG_CRYPTO) log_printhex ("DEK frame:", frame, nframe); n = 0; if (sk->pubkey_algo == PUBKEY_ALGO_ECDH) { gcry_mpi_t shared_mpi; gcry_mpi_t decoded; /* At the beginning the frame are the bytes of shared point MPI. */ err = gcry_mpi_scan (&shared_mpi, GCRYMPI_FMT_USG, frame, nframe, NULL); if (err) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } err = pk_ecdh_decrypt (&decoded, fp, enc->data[1]/*encr data as an MPI*/, shared_mpi, sk->pkey); mpi_release (shared_mpi); if(err) goto leave; xfree (frame); err = gcry_mpi_aprint (GCRYMPI_FMT_USG, &frame, &nframe, decoded); mpi_release (decoded); if (err) goto leave; /* Now the frame are the bytes decrypted but padded session key. */ /* Allow double padding for the benefit of DEK size concealment. Higher than this is wasteful. */ if (!nframe || frame[nframe-1] > 8*2 || nframe <= 8 || frame[nframe-1] > nframe) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } nframe -= frame[nframe-1]; /* Remove padding. */ log_assert (!n); /* (used just below) */ } else { if (padding) { if (n + 7 > nframe) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } if (frame[n] == 1 && frame[nframe - 1] == 2) { log_info (_("old encoding of the DEK is not supported\n")); err = gpg_error (GPG_ERR_CIPHER_ALGO); goto leave; } if (frame[n] != 2) /* Something went wrong. */ { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } for (n++; n < nframe && frame[n]; n++) /* Skip the random bytes. */ ; n++; /* Skip the zero byte. */ } } if (n + 4 > nframe) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } dek->keylen = nframe - (n + 1) - 2; dek->algo = frame[n++]; err = openpgp_cipher_test_algo (dek->algo); if (err) { if (!opt.quiet && gpg_err_code (err) == GPG_ERR_CIPHER_ALGO) { log_info (_("cipher algorithm %d%s is unknown or disabled\n"), dek->algo, dek->algo == CIPHER_ALGO_IDEA ? " (IDEA)" : ""); } dek->algo = 0; goto leave; } if (dek->keylen != openpgp_cipher_get_algo_keylen (dek->algo)) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } /* Copy the key to DEK and compare the checksum. */ csum = buf16_to_u16 (frame+nframe-2); memcpy (dek->key, frame + n, dek->keylen); for (csum2 = 0, n = 0; n < dek->keylen; n++) csum2 += dek->key[n]; if (csum != csum2) { err = gpg_error (GPG_ERR_WRONG_SECKEY); goto leave; } if (DBG_CLOCK) log_clock ("decryption ready"); if (DBG_CRYPTO) log_printhex ("DEK is:", dek->key, dek->keylen); /* Check that the algo is in the preferences and whether it has * expired. Also print a status line with the key's fingerprint. */ { PKT_public_key *pk = NULL; PKT_public_key *mainpk = NULL; KBNODE pkb = get_pubkeyblock (ctrl, keyid); if (!pkb) { err = -1; log_error ("oops: public key not found for preference check\n"); } else if (pkb->pkt->pkt.public_key->selfsigversion > 3 && dek->algo != CIPHER_ALGO_3DES && !opt.quiet && !is_algo_in_prefs (pkb, PREFTYPE_SYM, dek->algo)) log_info (_("WARNING: cipher algorithm %s not found in recipient" " preferences\n"), openpgp_cipher_algo_name (dek->algo)); if (!err) { kbnode_t k; int first = 1; for (k = pkb; k; k = k->next) { if (k->pkt->pkttype == PKT_PUBLIC_KEY || k->pkt->pkttype == PKT_PUBLIC_SUBKEY) { u32 aki[2]; if (first) { first = 0; mainpk = k->pkt->pkt.public_key; } keyid_from_pk (k->pkt->pkt.public_key, aki); if (aki[0] == keyid[0] && aki[1] == keyid[1]) { pk = k->pkt->pkt.public_key; break; } } } if (!pk) BUG (); if (pk->expiredate && pk->expiredate <= make_timestamp ()) { log_info (_("Note: secret key %s expired at %s\n"), keystr (keyid), asctimestamp (pk->expiredate)); } } if (pk && pk->flags.revoked) { log_info (_("Note: key has been revoked")); log_printf ("\n"); show_revocation_reason (ctrl, pk, 1); } if (is_status_enabled () && pk && mainpk) { char pkhex[MAX_FINGERPRINT_LEN*2+1]; char mainpkhex[MAX_FINGERPRINT_LEN*2+1]; hexfingerprint (pk, pkhex, sizeof pkhex); hexfingerprint (mainpk, mainpkhex, sizeof mainpkhex); /* Note that we do not want to create a trustdb just for * getting the ownertrust: If there is no trustdb there can't * be ulitmately trusted key anyway and thus the ownertrust * value is irrelevant. */ write_status_printf (STATUS_DECRYPTION_KEY, "%s %s %c", pkhex, mainpkhex, get_ownertrust_info (ctrl, mainpk, 1)); } release_kbnode (pkb); err = 0; } leave: xfree (frame); xfree (keygrip); return err; } /* * Get the session key from the given string. * String is supposed to be formatted as this: * : */ gpg_error_t get_override_session_key (DEK *dek, const char *string) { const char *s; int i; if (!string) return GPG_ERR_BAD_KEY; dek->algo = atoi (string); if (dek->algo < 1) return GPG_ERR_BAD_KEY; if (!(s = strchr (string, ':'))) return GPG_ERR_BAD_KEY; s++; for (i = 0; i < DIM (dek->key) && *s; i++, s += 2) { int c = hextobyte (s); if (c == -1) return GPG_ERR_BAD_KEY; dek->key[i] = c; } if (*s) return GPG_ERR_BAD_KEY; dek->keylen = i; return 0; } diff --git a/sm/decrypt.c b/sm/decrypt.c index cdce1d434..60ed14a64 100644 --- a/sm/decrypt.c +++ b/sm/decrypt.c @@ -1,643 +1,648 @@ /* decrypt.c - Decrypt a message * Copyright (C) 2001, 2003, 2010 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG 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 3 of the License, or * (at your option) any later version. * * GnuPG 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 . */ #include #include #include #include #include #include #include #include #include "gpgsm.h" #include #include #include "keydb.h" #include "../common/i18n.h" #include "../common/compliance.h" struct decrypt_filter_parm_s { int algo; int mode; int blklen; gcry_cipher_hd_t hd; char iv[16]; size_t ivlen; int any_data; /* did we push anything through the filter at all? */ unsigned char lastblock[16]; /* to strip the padding we have to keep this one */ char helpblock[16]; /* needed because there is no block buffering in libgcrypt (yet) */ int helpblocklen; }; /* Decrypt the session key and fill in the parm structure. The algo and the IV is expected to be already in PARM. */ static int prepare_decryption (ctrl_t ctrl, const char *hexkeygrip, const char *desc, ksba_const_sexp_t enc_val, struct decrypt_filter_parm_s *parm) { char *seskey = NULL; size_t n, seskeylen; int rc; rc = gpgsm_agent_pkdecrypt (ctrl, hexkeygrip, desc, enc_val, &seskey, &seskeylen); if (rc) { log_error ("error decrypting session key: %s\n", gpg_strerror (rc)); goto leave; } if (DBG_CRYPTO) log_printhex ("pkcs1 encoded session key:", seskey, seskeylen); n=0; if (seskeylen == 24 || seskeylen == 16) { /* Smells like a 3-DES or AES-128 key. This might happen * because a SC has already done the unpacking. A better * solution would be to test for this only after we triggered * the GPG_ERR_INV_SESSION_KEY. */ } else { if (n + 7 > seskeylen ) { rc = gpg_error (GPG_ERR_INV_SESSION_KEY); goto leave; } /* FIXME: Actually the leading zero is required but due to the way we encode the output in libgcrypt as an MPI we are not able to encode that leading zero. However, when using a Smartcard we are doing it the right way and therefore we have to skip the zero. This should be fixed in gpg-agent of course. */ if (!seskey[n]) n++; if (seskey[n] != 2 ) /* Wrong block type version. */ { rc = gpg_error (GPG_ERR_INV_SESSION_KEY); goto leave; } for (n++; n < seskeylen && seskey[n]; n++) /* Skip the random bytes. */ ; n++; /* and the zero byte */ if (n >= seskeylen ) { rc = gpg_error (GPG_ERR_INV_SESSION_KEY); goto leave; } } if (DBG_CRYPTO) log_printhex ("session key:", seskey+n, seskeylen-n); rc = gcry_cipher_open (&parm->hd, parm->algo, parm->mode, 0); if (rc) { log_error ("error creating decryptor: %s\n", gpg_strerror (rc)); goto leave; } rc = gcry_cipher_setkey (parm->hd, seskey+n, seskeylen-n); if (gpg_err_code (rc) == GPG_ERR_WEAK_KEY) { log_info (_("WARNING: message was encrypted with " "a weak key in the symmetric cipher.\n")); rc = 0; } if (rc) { log_error("key setup failed: %s\n", gpg_strerror(rc) ); goto leave; } gcry_cipher_setiv (parm->hd, parm->iv, parm->ivlen); leave: xfree (seskey); return rc; } /* This function is called by the KSBA writer just before the actual write is done. The function must take INLEN bytes from INBUF, decrypt it and store it inoutbuf which has a maximum size of maxoutlen. The valid bytes in outbuf should be return in outlen. Due to different buffer sizes or different length of input and output, it may happen that fewer bytes are processed or fewer bytes are written. */ static gpg_error_t decrypt_filter (void *arg, const void *inbuf, size_t inlen, size_t *inused, void *outbuf, size_t maxoutlen, size_t *outlen) { struct decrypt_filter_parm_s *parm = arg; int blklen = parm->blklen; size_t orig_inlen = inlen; /* fixme: Should we issue an error when we have not seen one full block? */ if (!inlen) return gpg_error (GPG_ERR_BUG); if (maxoutlen < 2*parm->blklen) return gpg_error (GPG_ERR_BUG); /* Make some space because we will later need an extra block at the end. */ maxoutlen -= blklen; if (parm->helpblocklen) { int i, j; for (i=parm->helpblocklen,j=0; i < blklen && j < inlen; i++, j++) parm->helpblock[i] = ((const char*)inbuf)[j]; inlen -= j; if (blklen > maxoutlen) return gpg_error (GPG_ERR_BUG); if (i < blklen) { parm->helpblocklen = i; *outlen = 0; } else { parm->helpblocklen = 0; if (parm->any_data) { memcpy (outbuf, parm->lastblock, blklen); *outlen =blklen; } else *outlen = 0; gcry_cipher_decrypt (parm->hd, parm->lastblock, blklen, parm->helpblock, blklen); parm->any_data = 1; } *inused = orig_inlen - inlen; return 0; } if (inlen > maxoutlen) inlen = maxoutlen; if (inlen % blklen) { /* store the remainder away */ parm->helpblocklen = inlen%blklen; inlen = inlen/blklen*blklen; memcpy (parm->helpblock, (const char*)inbuf+inlen, parm->helpblocklen); } *inused = inlen + parm->helpblocklen; if (inlen) { assert (inlen >= blklen); if (parm->any_data) { gcry_cipher_decrypt (parm->hd, (char*)outbuf+blklen, inlen, inbuf, inlen); memcpy (outbuf, parm->lastblock, blklen); memcpy (parm->lastblock,(char*)outbuf+inlen, blklen); *outlen = inlen; } else { gcry_cipher_decrypt (parm->hd, outbuf, inlen, inbuf, inlen); memcpy (parm->lastblock, (char*)outbuf+inlen-blklen, blklen); *outlen = inlen - blklen; parm->any_data = 1; } } else *outlen = 0; return 0; } /* Perform a decrypt operation. */ int gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp) { int rc; gnupg_ksba_io_t b64reader = NULL; gnupg_ksba_io_t b64writer = NULL; ksba_reader_t reader; ksba_writer_t writer; ksba_cms_t cms = NULL; ksba_stop_reason_t stopreason; KEYDB_HANDLE kh; int recp; estream_t in_fp = NULL; struct decrypt_filter_parm_s dfparm; memset (&dfparm, 0, sizeof dfparm); audit_set_type (ctrl->audit, AUDIT_TYPE_DECRYPT); kh = keydb_new (); if (!kh) { log_error (_("failed to allocate keyDB handle\n")); rc = gpg_error (GPG_ERR_GENERAL); goto leave; } in_fp = es_fdopen_nc (in_fd, "rb"); if (!in_fp) { rc = gpg_error_from_syserror (); log_error ("fdopen() failed: %s\n", strerror (errno)); goto leave; } rc = gnupg_ksba_create_reader (&b64reader, ((ctrl->is_pem? GNUPG_KSBA_IO_PEM : 0) | (ctrl->is_base64? GNUPG_KSBA_IO_BASE64 : 0) | (ctrl->autodetect_encoding? GNUPG_KSBA_IO_AUTODETECT : 0)), in_fp, &reader); if (rc) { log_error ("can't create reader: %s\n", gpg_strerror (rc)); goto leave; } rc = gnupg_ksba_create_writer (&b64writer, ((ctrl->create_pem? GNUPG_KSBA_IO_PEM : 0) | (ctrl->create_base64? GNUPG_KSBA_IO_BASE64 : 0)), ctrl->pem_name, out_fp, &writer); if (rc) { log_error ("can't create writer: %s\n", gpg_strerror (rc)); goto leave; } rc = ksba_cms_new (&cms); if (rc) goto leave; rc = ksba_cms_set_reader_writer (cms, reader, writer); if (rc) { log_debug ("ksba_cms_set_reader_writer failed: %s\n", gpg_strerror (rc)); goto leave; } audit_log (ctrl->audit, AUDIT_SETUP_READY); /* Parser loop. */ do { rc = ksba_cms_parse (cms, &stopreason); if (rc) { log_debug ("ksba_cms_parse failed: %s\n", gpg_strerror (rc)); goto leave; } if (stopreason == KSBA_SR_BEGIN_DATA || stopreason == KSBA_SR_DETACHED_DATA) { int algo, mode; const char *algoid; int any_key = 0; int is_de_vs; /* Computed compliance with CO_DE_VS. */ audit_log (ctrl->audit, AUDIT_GOT_DATA); algoid = ksba_cms_get_content_oid (cms, 2/* encryption algo*/); algo = gcry_cipher_map_name (algoid); mode = gcry_cipher_mode_from_oid (algoid); if (!algo || !mode) { rc = gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM); log_error ("unsupported algorithm '%s'\n", algoid? algoid:"?"); if (algoid && !strcmp (algoid, "1.2.840.113549.3.2")) log_info (_("(this is the RC2 algorithm)\n")); else if (!algoid) log_info (_("(this does not seem to be an encrypted" " message)\n")); { char numbuf[50]; sprintf (numbuf, "%d", rc); gpgsm_status2 (ctrl, STATUS_ERROR, "decrypt.algorithm", numbuf, algoid?algoid:"?", NULL); audit_log_s (ctrl->audit, AUDIT_BAD_DATA_CIPHER_ALGO, algoid); } /* If it seems that this is not an encrypted message we return a more sensible error code. */ if (!algoid) rc = gpg_error (GPG_ERR_NO_DATA); goto leave; } /* Check compliance. */ if (! gnupg_cipher_is_allowed (opt.compliance, 0, algo, mode)) { log_error (_("cipher algorithm '%s'" " may not be used in %s mode\n"), gcry_cipher_algo_name (algo), gnupg_compliance_option_string (opt.compliance)); rc = gpg_error (GPG_ERR_CIPHER_ALGO); goto leave; } /* For CMS, CO_DE_VS demands CBC mode. */ is_de_vs = gnupg_cipher_is_compliant (CO_DE_VS, algo, mode); audit_log_i (ctrl->audit, AUDIT_DATA_CIPHER_ALGO, algo); dfparm.algo = algo; dfparm.mode = mode; dfparm.blklen = gcry_cipher_get_algo_blklen (algo); if (dfparm.blklen > sizeof (dfparm.helpblock)) return gpg_error (GPG_ERR_BUG); rc = ksba_cms_get_content_enc_iv (cms, dfparm.iv, sizeof (dfparm.iv), &dfparm.ivlen); if (rc) { log_error ("error getting IV: %s\n", gpg_strerror (rc)); goto leave; } for (recp=0; !any_key; recp++) { char *issuer; ksba_sexp_t serial; ksba_sexp_t enc_val; char *hexkeygrip = NULL; char *desc = NULL; char kidbuf[16+1]; *kidbuf = 0; rc = ksba_cms_get_issuer_serial (cms, recp, &issuer, &serial); if (rc == -1 && recp) break; /* no more recipients */ audit_log_i (ctrl->audit, AUDIT_NEW_RECP, recp); if (rc) log_error ("recp %d - error getting info: %s\n", recp, gpg_strerror (rc)); else { ksba_cert_t cert = NULL; log_debug ("recp %d - issuer: '%s'\n", recp, issuer? issuer:"[NONE]"); log_debug ("recp %d - serial: ", recp); gpgsm_dump_serial (serial); log_printf ("\n"); if (ctrl->audit) { char *tmpstr = gpgsm_format_sn_issuer (serial, issuer); audit_log_s (ctrl->audit, AUDIT_RECP_NAME, tmpstr); xfree (tmpstr); } keydb_search_reset (kh); rc = keydb_search_issuer_sn (ctrl, kh, issuer, serial); if (rc) { log_error ("failed to find the certificate: %s\n", gpg_strerror(rc)); goto oops; } rc = keydb_get_cert (kh, &cert); if (rc) { log_error ("failed to get cert: %s\n", gpg_strerror (rc)); goto oops; } /* Print the ENC_TO status line. Note that we can do so only if we have the certificate. This is in contrast to gpg where the keyID is commonly included in the encrypted messages. It is too cumbersome to retrieve the used algorithm, thus we don't print it for now. We also record the keyid for later use. */ { unsigned long kid[2]; kid[0] = gpgsm_get_short_fingerprint (cert, kid+1); snprintf (kidbuf, sizeof kidbuf, "%08lX%08lX", kid[1], kid[0]); gpgsm_status2 (ctrl, STATUS_ENC_TO, kidbuf, "0", "0", NULL); } /* Put the certificate into the audit log. */ audit_log_cert (ctrl->audit, AUDIT_SAVE_CERT, cert, 0); /* Just in case there is a problem with the own certificate we print this message - should never happen of course */ rc = gpgsm_cert_use_decrypt_p (cert); if (rc) { char numbuf[50]; sprintf (numbuf, "%d", rc); gpgsm_status2 (ctrl, STATUS_ERROR, "decrypt.keyusage", numbuf, NULL); rc = 0; } hexkeygrip = gpgsm_get_keygrip_hexstring (cert); desc = gpgsm_format_keydesc (cert); { unsigned int nbits; int pk_algo = gpgsm_get_key_algo_info (cert, &nbits); - /* Print compliance warning. */ - if (! gnupg_pk_is_compliant (opt.compliance, - pk_algo, NULL, nbits, NULL)) + /* Check compliance. */ + if (!gnupg_pk_is_allowed (opt.compliance, + PK_USE_DECRYPTION, + pk_algo, NULL, nbits, NULL)) { char kidstr[10+1]; snprintf (kidstr, sizeof kidstr, "0x%08lX", gpgsm_get_short_fingerprint (cert, NULL)); log_info - (_("Note: key %s is not suitable for encryption" + (_("key %s is not suitable for decryption" " in %s mode\n"), kidstr, gnupg_compliance_option_string (opt.compliance)); + rc = gpg_error (GPG_ERR_PUBKEY_ALGO); + goto oops; } /* Check that all certs are compliant with CO_DE_VS. */ is_de_vs = (is_de_vs && gnupg_pk_is_compliant (CO_DE_VS, pk_algo, NULL, nbits, NULL)); } oops: if (rc) - /* We cannot check compliance of certs that we - * don't have. */ - is_de_vs = 0; + { + /* We cannot check compliance of certs that we + * don't have. */ + is_de_vs = 0; + } xfree (issuer); xfree (serial); ksba_cert_release (cert); } if (!hexkeygrip) ; else if (!(enc_val = ksba_cms_get_enc_val (cms, recp))) log_error ("recp %d - error getting encrypted session key\n", recp); else { rc = prepare_decryption (ctrl, hexkeygrip, desc, enc_val, &dfparm); xfree (enc_val); if (rc) { log_info ("decrypting session key failed: %s\n", gpg_strerror (rc)); if (gpg_err_code (rc) == GPG_ERR_NO_SECKEY && *kidbuf) gpgsm_status2 (ctrl, STATUS_NO_SECKEY, kidbuf, NULL); } else { /* setup the bulk decrypter */ any_key = 1; ksba_writer_set_filter (writer, decrypt_filter, &dfparm); if (is_de_vs) gpgsm_status (ctrl, STATUS_DECRYPTION_COMPLIANCE_MODE, gnupg_status_compliance_flag (CO_DE_VS)); } audit_log_ok (ctrl->audit, AUDIT_RECP_RESULT, rc); } xfree (hexkeygrip); xfree (desc); } /* If we write an audit log add the unused recipients to the log as well. */ if (ctrl->audit && any_key) { for (;; recp++) { char *issuer; ksba_sexp_t serial; int tmp_rc; tmp_rc = ksba_cms_get_issuer_serial (cms, recp, &issuer, &serial); if (tmp_rc == -1) break; /* no more recipients */ audit_log_i (ctrl->audit, AUDIT_NEW_RECP, recp); if (tmp_rc) log_error ("recp %d - error getting info: %s\n", recp, gpg_strerror (rc)); else { char *tmpstr = gpgsm_format_sn_issuer (serial, issuer); audit_log_s (ctrl->audit, AUDIT_RECP_NAME, tmpstr); xfree (tmpstr); xfree (issuer); xfree (serial); } } } if (!any_key) { rc = gpg_error (GPG_ERR_NO_SECKEY); goto leave; } } else if (stopreason == KSBA_SR_END_DATA) { ksba_writer_set_filter (writer, NULL, NULL); if (dfparm.any_data) { /* write the last block with padding removed */ int i, npadding = dfparm.lastblock[dfparm.blklen-1]; if (!npadding || npadding > dfparm.blklen) { log_error ("invalid padding with value %d\n", npadding); rc = gpg_error (GPG_ERR_INV_DATA); goto leave; } rc = ksba_writer_write (writer, dfparm.lastblock, dfparm.blklen - npadding); if (rc) goto leave; for (i=dfparm.blklen - npadding; i < dfparm.blklen; i++) { if (dfparm.lastblock[i] != npadding) { log_error ("inconsistent padding\n"); rc = gpg_error (GPG_ERR_INV_DATA); goto leave; } } } } } while (stopreason != KSBA_SR_READY); rc = gnupg_ksba_finish_writer (b64writer); if (rc) { log_error ("write failed: %s\n", gpg_strerror (rc)); goto leave; } gpgsm_status (ctrl, STATUS_DECRYPTION_OKAY, NULL); leave: audit_log_ok (ctrl->audit, AUDIT_DECRYPTION_RESULT, rc); if (rc) { gpgsm_status (ctrl, STATUS_DECRYPTION_FAILED, NULL); log_error ("message decryption failed: %s <%s>\n", gpg_strerror (rc), gpg_strsource (rc)); } ksba_cms_release (cms); gnupg_ksba_destroy_reader (b64reader); gnupg_ksba_destroy_writer (b64writer); keydb_release (kh); es_fclose (in_fp); if (dfparm.hd) gcry_cipher_close (dfparm.hd); return rc; }