/* app-openpgp.c - The OpenPGP card application. * Copyright (C) 2003 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 2 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include #include #include #include #include #include #include "scdaemon.h" #include "app-common.h" #include "iso7816.h" static struct { int tag; int constructed; int get_from; /* Constructed DO with this DO or 0 for direct access. */ int binary; char *desc; } data_objects[] = { { 0x005E, 0, 0, 1, "Login Data" }, { 0x5F50, 0, 0, 0, "URL" }, { 0x0065, 1, 0, 1, "Cardholder Related Data"}, { 0x005B, 0, 0x65, 0, "Name" }, { 0x5F2D, 0, 0x65, 0, "Language preferences" }, { 0x5F35, 0, 0x65, 0, "Sex" }, { 0x006E, 1, 0, 1, "Application Related Data" }, { 0x004F, 0, 0x6E, 1, "AID" }, { 0x0073, 1, 0, 1, "Discretionary Data Objects" }, { 0x0047, 0, 0x6E, 1, "Card Capabilities" }, { 0x00C0, 0, 0x6E, 1, "Extended Card Capabilities" }, { 0x00C1, 0, 0x6E, 1, "Algorithm Attributes Signature" }, { 0x00C2, 0, 0x6E, 1, "Algorithm Attributes Decryption" }, { 0x00C3, 0, 0x6E, 1, "Algorithm Attributes Authentication" }, { 0x00C4, 0, 0x6E, 1, "CHV Status Bytes" }, { 0x00C5, 0, 0x6E, 1, "Fingerprints" }, { 0x00C6, 0, 0x6E, 1, "CA Fingerprints" }, { 0x007A, 1, 0, 1, "Security Support Template" }, { 0x0093, 0, 0x7A, 1, "Digital Signature Counter" }, { 0 } }; static unsigned long get_sig_counter (APP app); /* Locate a TLV encoded data object in BUFFER of LENGTH and return a pointer to value as well as its length in NBYTES. Return NULL if it was not found. Note, that the function does not check whether the value fits into the provided buffer. FIXME: Move this to an extra file, it is mostly duplicated from card.c. */ static const unsigned char * find_tlv (const unsigned char *buffer, size_t length, int tag, size_t *nbytes, int nestlevel) { const unsigned char *s = buffer; size_t n = length; size_t len; int this_tag; int composite; for (;;) { buffer = s; if (n < 2) return NULL; /* buffer definitely too short for tag and length. */ if (!*s || *s == 0xff) { /* Skip optional filler between TLV objects. */ s++; n--; continue; } composite = !!(*s & 0x20); if ((*s & 0x1f) == 0x1f) { /* more tag bytes to follow */ s++; n--; if (n < 2) return NULL; /* buffer definitely too short for tag and length. */ if ((*s & 0x1f) == 0x1f) return NULL; /* We support only up to 2 bytes. */ this_tag = (s[-1] << 8) | (s[0] & 0x7f); } else this_tag = s[0]; len = s[1]; s += 2; n -= 2; if (len < 0x80) ; else if (len == 0x81) { /* One byte length follows. */ if (!n) return NULL; /* we expected 1 more bytes with the length. */ len = s[0]; s++; n--; } else if (len == 0x82) { /* Two byte length follows. */ if (n < 2) return NULL; /* we expected 2 more bytes with the length. */ len = (s[0] << 8) | s[1]; s += 2; n -= 2; } else return NULL; /* APDU limit is 65535, thus it does not make sense to assume longer length fields. */ if (composite && nestlevel < 100) { /* Dive into this composite DO after checking for too deep nesting. */ const unsigned char *tmp_s; size_t tmp_len; tmp_s = find_tlv (s, len, tag, &tmp_len, nestlevel+1); if (tmp_s) { *nbytes = tmp_len; return tmp_s; } } if (this_tag == tag) { *nbytes = len; return s; } if (len > n) return NULL; /* buffer too short to skip to the next tag. */ s += len; n -= len; } } /* Get the DO identified by TAG from the card in SLOT and return a buffer with its content in RESULT and NBYTES. The return value is NULL if not found or a pointer which must be used to release the buffer holding value. */ static void * get_one_do (int slot, int tag, unsigned char **result, size_t *nbytes) { int rc, i; unsigned char *buffer; size_t buflen; unsigned char *value; size_t valuelen; *result = NULL; *nbytes = 0; for (i=0; data_objects[i].tag && data_objects[i].tag != tag; i++) ; value = NULL; rc = -1; if (data_objects[i].tag && data_objects[i].get_from) { rc = iso7816_get_data (slot, data_objects[i].get_from, &buffer, &buflen); if (!rc) { const unsigned char *s; s = find_tlv (buffer, buflen, tag, &valuelen, 0); if (!s) value = NULL; /* not found */ else if (valuelen > buflen - (s - buffer)) { log_error ("warning: constructed DO too short\n"); value = NULL; xfree (buffer); buffer = NULL; } else value = buffer + (s - buffer); } } if (!value) /* Not in a constructed DO, try simple. */ { rc = iso7816_get_data (slot, tag, &buffer, &buflen); if (!rc) { value = buffer; valuelen = buflen; } } if (!rc) { *nbytes = valuelen; *result = value; return buffer; } return NULL; } #if 0 /* not used */ static void dump_one_do (int slot, int tag) { int rc, i; unsigned char *buffer; size_t buflen; const char *desc; int binary; const unsigned char *value; size_t valuelen; for (i=0; data_objects[i].tag && data_objects[i].tag != tag; i++) ; desc = data_objects[i].tag? data_objects[i].desc : "?"; binary = data_objects[i].tag? data_objects[i].binary : 1; value = NULL; rc = -1; if (data_objects[i].tag && data_objects[i].get_from) { rc = iso7816_get_data (slot, data_objects[i].get_from, &buffer, &buflen); if (!rc) { value = find_tlv (buffer, buflen, tag, &valuelen, 0); if (!value) ; /* not found */ else if (valuelen > buflen - (value - buffer)) { log_error ("warning: constructed DO too short\n"); value = NULL; xfree (buffer); buffer = NULL; } } } if (!value) /* Not in a constructed DO, try simple. */ { rc = iso7816_get_data (slot, tag, &buffer, &buflen); if (!rc) { value = buffer; valuelen = buflen; } } if (rc == 0x6a88) log_info ("DO `%s' not available\n", desc); else if (rc) log_info ("DO `%s' not available (rc=%04X)\n", desc, rc); else { if (binary) { log_info ("DO `%s': ", desc); log_printhex ("", value, valuelen); } else log_info ("DO `%s': `%.*s'\n", desc, (int)valuelen, value); /* FIXME: sanitize */ xfree (buffer); } } #endif /*not used*/ static void dump_all_do (int slot) { int rc, i, j; unsigned char *buffer; size_t buflen; for (i=0; data_objects[i].tag; i++) { if (data_objects[i].get_from) continue; rc = iso7816_get_data (slot, data_objects[i].tag, &buffer, &buflen); if (rc == 0x6a88) ; else if (rc) log_info ("DO `%s' not available (rc=%04X)\n", data_objects[i].desc, rc); else { if (data_objects[i].binary) { log_info ("DO `%s': ", data_objects[i].desc); log_printhex ("", buffer, buflen); } else log_info ("DO `%s': `%.*s'\n", data_objects[i].desc, (int)buflen, buffer); /* FIXME: sanitize */ } if (data_objects[i].constructed) { for (j=0; data_objects[j].tag; j++) { const unsigned char *value; size_t valuelen; if (j==i || data_objects[i].tag != data_objects[j].get_from) continue; value = find_tlv (buffer, buflen, data_objects[j].tag, &valuelen, 0); if (!value) ; /* not found */ else if (valuelen > buflen - (value - buffer)) log_error ("warning: constructed DO too short\n"); else { if (data_objects[j].binary) { log_info ("DO `%s': ", data_objects[j].desc); log_printhex ("", value, valuelen); } else log_info ("DO `%s': `%.*s'\n", data_objects[j].desc, (int)valuelen, value); /* FIXME: sanitize */ } } } xfree (buffer); buffer = NULL; } } /* Count the number of bits, assuming the A represents an unsigned big integer of length LEN bytes. */ static unsigned int count_bits (const unsigned char *a, size_t len) { unsigned int n = len * 8; int i; for (; len && !*a; len--, a++, n -=8) ; if (len) { for (i=7; i && !(*a & (1<> 8; /* 2 byte length header */ *p++ = n; *p++ = 4; /* key packet version */ *p++ = timestamp >> 24; *p++ = timestamp >> 16; *p++ = timestamp >> 8; *p++ = timestamp; *p++ = 1; /* RSA */ nbits = count_bits (m, mlen); *p++ = nbits >> 8; *p++ = nbits; memcpy (p, m, mlen); p += mlen; nbits = count_bits (e, elen); *p++ = nbits >> 8; *p++ = nbits; memcpy (p, e, elen); p += elen; log_printhex ("fprbuf:", buffer, n+3); gcry_md_hash_buffer (GCRY_MD_SHA1, fpr, buffer, n+3); xfree (buffer); rc = iso7816_put_data (slot, (card_version > 0x0007? 0xC7 : 0xC6) + keynumber, fpr, 20); if (rc) log_error ("failed to store the fingerprint: rc=%04X\n", rc); return rc; } static void send_fpr_if_not_null (CTRL ctrl, const char *keyword, int number, const unsigned char *fpr) { int i; char buf[41]; char numbuf[25]; for (i=0; i < 20 && !fpr[i]; i++) ; if (i==20) return; /* All zero. */ for (i=0; i< 20; i++) sprintf (buf+2*i, "%02X", fpr[i]); if (number == -1) *numbuf = 0; /* Don't print the key number */ else sprintf (numbuf, "%d", number); send_status_info (ctrl, keyword, numbuf, (size_t)strlen(numbuf), buf, (size_t)strlen (buf), NULL, 0); } static void send_key_data (CTRL ctrl, const char *name, const unsigned char *a, size_t alen) { char *p, *buf = xmalloc (alen*2+1); for (p=buf; alen; a++, alen--, p += 2) sprintf (p, "%02X", *a); send_status_info (ctrl, "KEY-DATA", name, (size_t)strlen(name), buf, (size_t)strlen (buf), NULL, 0); xfree (buf); } static int do_learn_status (APP app, CTRL ctrl) { void *relptr; unsigned char *value; size_t valuelen; int i; relptr = get_one_do (app->slot, 0x005B, &value, &valuelen); if (relptr) { send_status_info (ctrl, "DISP-NAME", value, valuelen, NULL, 0); xfree (relptr); } relptr = get_one_do (app->slot, 0x5F2D, &value, &valuelen); if (relptr) { send_status_info (ctrl, "DISP-LANG", value, valuelen, NULL, 0); xfree (relptr); } relptr = get_one_do (app->slot, 0x5F35, &value, &valuelen); if (relptr) { send_status_info (ctrl, "DISP-SEX", value, valuelen, NULL, 0); xfree (relptr); } relptr = get_one_do (app->slot, 0x5F50, &value, &valuelen); if (relptr) { send_status_info (ctrl, "PUBKEY-URL", value, valuelen, NULL, 0); xfree (relptr); } relptr = get_one_do (app->slot, 0x005E, &value, &valuelen); if (relptr) { send_status_info (ctrl, "LOGIN-DATA", value, valuelen, NULL, 0); xfree (relptr); } relptr = get_one_do (app->slot, 0x00C5, &value, &valuelen); if (relptr && valuelen >= 60) { for (i=0; i < 3; i++) send_fpr_if_not_null (ctrl, "KEY-FPR", i+1, value+i*20); } xfree (relptr); relptr = get_one_do (app->slot, 0x00C6, &value, &valuelen); if (relptr && valuelen >= 60) { for (i=0; i < 3; i++) send_fpr_if_not_null (ctrl, "CA-FPR", i+1, value+i*20); } xfree (relptr); relptr = get_one_do (app->slot, 0x00C4, &value, &valuelen); if (relptr) { char numbuf[7*23]; for (i=0,*numbuf=0; i < valuelen && i < 7; i++) sprintf (numbuf+strlen (numbuf), " %d", value[i]); send_status_info (ctrl, "CHV-STATUS", numbuf, strlen (numbuf), NULL, 0); xfree (relptr); } { unsigned long ul = get_sig_counter (app); char numbuf[23]; sprintf (numbuf, "%lu", ul); send_status_info (ctrl, "SIG-COUNTER", numbuf, strlen (numbuf), NULL, 0); } return 0; } /* Handle the SETATTR operation. All arguments are already basically checked. */ static int do_setattr (APP app, const char *name, int (*pincb)(void*, const char *, char **), void *pincb_arg, const unsigned char *value, size_t valuelen) { gpg_error_t rc; int idx; static struct { const char *name; int tag; } table[] = { { "DISP-NAME", 0x005B }, { "LOGIN-DATA", 0x005E }, { "DISP-LANG", 0x5F2D }, { "DISP-SEX", 0x5F35 }, { "PUBKEY-URL", 0x5F50 }, { "CHV-STATUS-1", 0x00C4 }, { "CA-FPR-1", 0x00CA }, { "CA-FPR-2", 0x00CB }, { "CA-FPR-3", 0x00CC }, { NULL, 0 } }; for (idx=0; table[idx].name && strcmp (table[idx].name, name); idx++) ; if (!table[idx].name) return gpg_error (GPG_ERR_INV_NAME); if (!app->did_chv3) { char *pinvalue; rc = pincb (pincb_arg, "Admin PIN (CHV3)", &pinvalue); /* pinvalue = xstrdup ("12345678"); */ /* rc = 0; */ if (rc) { log_info ("PIN callback returned error: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x83, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV3 failed\n"); rc = gpg_error (GPG_ERR_GENERAL); return rc; } app->did_chv3 = 1; } rc = iso7816_put_data (app->slot, table[idx].tag, value, valuelen); if (rc) log_error ("failed to set `%s': %s\n", table[idx].name, gpg_strerror (rc)); /* FIXME: If this fails we should *once* try again after doing a verify command, so that in case of a problem with tracking the verify operation we have a fallback. */ return rc; } /* Handle the PASSWD command. */ static int do_change_pin (APP app, CTRL ctrl, const char *chvnostr, int reset_mode, int (*pincb)(void*, const char *, char **), void *pincb_arg) { int rc = 0; int chvno = atoi (chvnostr); char *pinvalue; if (reset_mode && chvno == 3) { rc = gpg_error (GPG_ERR_INV_ID); goto leave; } else if (reset_mode || chvno == 3) { rc = pincb (pincb_arg, "Admin PIN", &pinvalue); if (rc) { log_error ("error getting PIN: %s\n", gpg_strerror (rc)); goto leave; } rc = iso7816_verify (app->slot, 0x83, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV3 failed: rc=%04X\n", rc); goto leave; } } else if (chvno == 1) { rc = pincb (pincb_arg, "Signature PIN", &pinvalue); if (rc) { log_error ("error getting PIN: %s\n", gpg_strerror (rc)); goto leave; } rc = iso7816_verify (app->slot, 0x81, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV1 failed: rc=%04X\n", rc); goto leave; } } else if (chvno == 2) { rc = pincb (pincb_arg, "Decryption PIN", &pinvalue); if (rc) { log_error ("error getting PIN: %s\n", gpg_strerror (rc)); goto leave; } rc = iso7816_verify (app->slot, 0x82, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV2 failed: rc=%04X\n", rc); goto leave; } } else { rc = gpg_error (GPG_ERR_INV_ID); goto leave; } rc = pincb (pincb_arg, chvno == 1? "New Signature PIN" : chvno == 2? "New Decryption PIN" : chvno == 3? "New Admin PIN" : "?", &pinvalue); if (rc) { log_error ("error getting new PIN: %s\n", gpg_strerror (rc)); goto leave; } if (reset_mode) rc = iso7816_reset_retry_counter (app->slot, 0x80 + chvno, pinvalue, strlen (pinvalue)); else rc = iso7816_change_reference_data (app->slot, 0x80 + chvno, NULL, 0, pinvalue, strlen (pinvalue)); xfree (pinvalue); leave: return rc; } /* Handle the GENKEY command. */ static int do_genkey (APP app, CTRL ctrl, const char *keynostr, unsigned int flags, int (*pincb)(void*, const char *, char **), void *pincb_arg) { int rc; int i; char numbuf[30]; unsigned char fprbuf[20]; const unsigned char *fpr; const unsigned char *keydata, *m, *e; unsigned char *buffer; size_t buflen, keydatalen, n, mlen, elen; time_t created_at; int keyno = atoi (keynostr); int force = (flags & 1); time_t start_at; if (keyno < 1 || keyno > 3) return gpg_error (GPG_ERR_INV_ID); keyno--; rc = iso7816_get_data (app->slot, 0x006E, &buffer, &buflen); if (rc) { log_error ("error reading application data\n"); return gpg_error (GPG_ERR_GENERAL); } fpr = find_tlv (buffer, buflen, 0x00C5, &n, 0); if (!fpr || n != 60) { rc = gpg_error (GPG_ERR_GENERAL); log_error ("error reading fingerprint DO\n"); goto leave; } fpr += 20*keyno; for (i=0; i < 20 && !fpr[i]; i++) ; if (i!=20 && !force) { rc = gpg_error (GPG_ERR_EEXIST); log_error ("key already exists\n"); goto leave; } else if (i!=20) log_info ("existing key will be replaced\n"); else log_info ("generating new key\n"); { char *pinvalue; rc = pincb (pincb_arg, "Admin PIN", &pinvalue); if (rc) { log_error ("error getting PIN: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x83, pinvalue, strlen (pinvalue)); xfree (pinvalue); } if (rc) { log_error ("verify CHV3 failed: rc=%04X\n", rc); goto leave; } xfree (buffer); buffer = NULL; #if 1 log_info ("please wait while key is being generated ...\n"); start_at = time (NULL); rc = iso7816_generate_keypair #else #warning key generation temporary replaced by reading an existing key. rc = iso7816_read_public_key #endif (app->slot, keyno == 0? "\xB6" : keyno == 1? "\xB8" : "\xA4", 2, &buffer, &buflen); if (rc) { rc = gpg_error (GPG_ERR_CARD); log_error ("generating key failed\n"); goto leave; } log_info ("key generation completed (%d seconds)\n", (int)(time (NULL) - start_at)); keydata = find_tlv (buffer, buflen, 0x7F49, &keydatalen, 0); if (!keydata) { rc = gpg_error (GPG_ERR_CARD); log_error ("response does not contain the public key data\n"); goto leave; } m = find_tlv (keydata, keydatalen, 0x0081, &mlen, 0); if (!m) { rc = gpg_error (GPG_ERR_CARD); log_error ("response does not contain the RSA modulus\n"); goto leave; } /* log_printhex ("RSA n:", m, mlen); */ send_key_data (ctrl, "n", m, mlen); e = find_tlv (keydata, keydatalen, 0x0082, &elen, 0); if (!e) { rc = gpg_error (GPG_ERR_CARD); log_error ("response does not contain the RSA public exponent\n"); goto leave; } /* log_printhex ("RSA e:", e, elen); */ send_key_data (ctrl, "e", e, elen); created_at = gnupg_get_time (); sprintf (numbuf, "%lu", (unsigned long)created_at); send_status_info (ctrl, "KEY-CREATED-AT", numbuf, (size_t)strlen(numbuf), NULL, 0); rc = store_fpr (app->slot, keyno, (u32)created_at, m, mlen, e, elen, fprbuf, app->card_version); if (rc) goto leave; send_fpr_if_not_null (ctrl, "KEY-FPR", -1, fprbuf); leave: xfree (buffer); return rc; } static unsigned long get_sig_counter (APP app) { void *relptr; unsigned char *value; size_t valuelen; unsigned long ul; relptr = get_one_do (app->slot, 0x0093, &value, &valuelen); if (!relptr) return 0; if (valuelen == 3 ) ul = (value[0] << 16) | (value[1] << 8) | value[2]; else { log_error ("invalid structure of OpenPGP card (DO 0x93)\n"); ul = 0; } xfree (relptr); return ul; } static int compare_fingerprint (APP app, int keyno, unsigned char *sha1fpr) { const unsigned char *fpr; unsigned char *buffer; size_t buflen, n; int rc, i; assert (keyno >= 1 && keyno <= 3); rc = iso7816_get_data (app->slot, 0x006E, &buffer, &buflen); if (rc) { log_error ("error reading application data\n"); return gpg_error (GPG_ERR_GENERAL); } fpr = find_tlv (buffer, buflen, 0x00C5, &n, 0); if (!fpr || n != 60) { xfree (buffer); log_error ("error reading fingerprint DO\n"); return gpg_error (GPG_ERR_GENERAL); } fpr += (keyno-1)*20; for (i=0; i < 20; i++) if (sha1fpr[i] != fpr[i]) { xfree (buffer); return gpg_error (GPG_ERR_WRONG_SECKEY); } xfree (buffer); return 0; } /* Compute a digital signature on INDATA which is expected to be the raw message digest. For this application the KEYIDSTR consists of the serialnumber and the fingerprint delimited by a slash. Note that this fucntion may return the error code GPG_ERR_WRONG_CARD to indicate that the card currently present does not match the one required for the requested action (e.g. the serial number does not match). */ static int do_sign (APP app, const char *keyidstr, int hashalgo, int (*pincb)(void*, const char *, char **), void *pincb_arg, const void *indata, size_t indatalen, unsigned char **outdata, size_t *outdatalen ) { static unsigned char sha1_prefix[15] = /* Object ID is 1.3.14.3.2.26 */ { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 }; static unsigned char rmd160_prefix[15] = /* Object ID is 1.3.36.3.2.1 */ { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x24, 0x03, 0x02, 0x01, 0x05, 0x00, 0x04, 0x14 }; int rc; unsigned char data[35]; unsigned char tmp_sn[20]; /* actually 16 but we use it also for the fpr. */ const char *s; int n; const char *fpr = NULL; unsigned long sigcount; if (!keyidstr || !*keyidstr) return gpg_error (GPG_ERR_INV_VALUE); if (indatalen != 20) return gpg_error (GPG_ERR_INV_VALUE); /* Check whether an OpenPGP card of any version has been requested. */ if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12)) return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; hexdigitp (s); s++, n++) ; if (n != 32) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* no fingerprint given: we allow this for now. */ else if (*s == '/') fpr = s + 1; else return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; n < 16; s += 2, n++) tmp_sn[n] = xtoi_2 (s); if (app->serialnolen != 16) return gpg_error (GPG_ERR_INV_CARD); if (memcmp (app->serialno, tmp_sn, 16)) return gpg_error (GPG_ERR_WRONG_CARD); /* If a fingerprint has been specified check it against the one on the card. This is allows for a meaningful error message in case the key on the card has been replaced but the shadow information known to gpg was not updated. If there is no fingerprint, gpg will detect a bogus signature anyway due to the verify-after-signing feature. */ if (fpr) { for (s=fpr, n=0; hexdigitp (s); s++, n++) ; if (n != 40) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* okay */ else return gpg_error (GPG_ERR_INV_ID); for (s=fpr, n=0; n < 20; s += 2, n++) tmp_sn[n] = xtoi_2 (s); rc = compare_fingerprint (app, 1, tmp_sn); if (rc) return rc; } if (hashalgo == GCRY_MD_SHA1) memcpy (data, sha1_prefix, 15); else if (hashalgo == GCRY_MD_RMD160) memcpy (data, rmd160_prefix, 15); else return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM); memcpy (data+15, indata, indatalen); sigcount = get_sig_counter (app); log_info ("signatures created so far: %lu\n", sigcount); /* FIXME: Check whether we are really required to enter the PIN for each signature. There is a DO for this. */ if (!app->did_chv1 || 1) { char *pinvalue; { char *prompt; if (asprintf (&prompt, "Signature PIN [sigs done: %lu]", sigcount) < 0) return gpg_error_from_errno (errno); rc = pincb (pincb_arg, prompt, &pinvalue); free (prompt); } /* pinvalue = xstrdup ("123456"); */ /* rc = 0; */ if (rc) { log_info ("PIN callback returned error: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x81, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV1 failed\n"); rc = gpg_error (GPG_ERR_GENERAL); return rc; } app->did_chv1 = 1; } rc = iso7816_compute_ds (app->slot, data, 35, outdata, outdatalen); return rc; } /* Compute a digital signature using the INTERNAL AUTHENTICATE command on INDATA which is expected to be the raw message digest. For this application the KEYIDSTR consists of the serialnumber and the fingerprint delimited by a slash. Note that this fucntion may return the error code GPG_ERR_WRONG_CARD to indicate that the card currently present does not match the one required for the requested action (e.g. the serial number does not match). */ static int do_auth (APP app, const char *keyidstr, int (*pincb)(void*, const char *, char **), void *pincb_arg, const void *indata, size_t indatalen, unsigned char **outdata, size_t *outdatalen ) { int rc; unsigned char tmp_sn[20]; /* actually 16 but we use it also for the fpr. */ const char *s; int n; const char *fpr = NULL; if (!keyidstr || !*keyidstr) return gpg_error (GPG_ERR_INV_VALUE); if (indatalen > 50) /* For a 1024 bit key. */ return gpg_error (GPG_ERR_INV_VALUE); /* Check whether an OpenPGP card of any version has been requested. */ if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12)) return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; hexdigitp (s); s++, n++) ; if (n != 32) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* no fingerprint given: we allow this for now. */ else if (*s == '/') fpr = s + 1; else return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; n < 16; s += 2, n++) tmp_sn[n] = xtoi_2 (s); if (app->serialnolen != 16) return gpg_error (GPG_ERR_INV_CARD); if (memcmp (app->serialno, tmp_sn, 16)) return gpg_error (GPG_ERR_WRONG_CARD); /* If a fingerprint has been specified check it against the one on the card. This is allows for a meaningful error message in case the key on the card has been replaced but the shadow information known to gpg was not updated. If there is no fingerprint, gpg will detect a bogus signature anyway due to the verify-after-signing feature. */ if (fpr) { for (s=fpr, n=0; hexdigitp (s); s++, n++) ; if (n != 40) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* okay */ else return gpg_error (GPG_ERR_INV_ID); for (s=fpr, n=0; n < 20; s += 2, n++) tmp_sn[n] = xtoi_2 (s); rc = compare_fingerprint (app, 3, tmp_sn); if (rc) return rc; } if (!app->did_chv2) { char *pinvalue; rc = pincb (pincb_arg, "Authentication/Decryption PIN", &pinvalue); if (rc) { log_info ("PIN callback returned error: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x82, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV2 failed\n"); rc = gpg_error (GPG_ERR_GENERAL); return rc; } app->did_chv2 = 1; } rc = iso7816_internal_authenticate (app->slot, indata, indatalen, outdata, outdatalen); return rc; } static int do_decipher (APP app, const char *keyidstr, int (pincb)(void*, const char *, char **), void *pincb_arg, const void *indata, size_t indatalen, unsigned char **outdata, size_t *outdatalen ) { int rc; unsigned char tmp_sn[20]; /* actually 16 but we use it also for the fpr. */ const char *s; int n; const char *fpr = NULL; if (!keyidstr || !*keyidstr || !indatalen) return gpg_error (GPG_ERR_INV_VALUE); /* Check whether an OpenPGP card of any version has been requested. */ if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12)) return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; hexdigitp (s); s++, n++) ; if (n != 32) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* no fingerprint given: we allow this for now. */ else if (*s == '/') fpr = s + 1; else return gpg_error (GPG_ERR_INV_ID); for (s=keyidstr, n=0; n < 16; s += 2, n++) tmp_sn[n] = xtoi_2 (s); if (app->serialnolen != 16) return gpg_error (GPG_ERR_INV_CARD); if (memcmp (app->serialno, tmp_sn, 16)) return gpg_error (GPG_ERR_WRONG_CARD); /* If a fingerprint has been specified check it against the one on the card. This is allows for a meaningful error message in case the key on the card has been replaced but the shadow information known to gpg was not updated. If there is no fingerprint, the decryption will won't produce the right plaintext anyway. */ if (fpr) { for (s=fpr, n=0; hexdigitp (s); s++, n++) ; if (n != 40) return gpg_error (GPG_ERR_INV_ID); else if (!*s) ; /* okay */ else return gpg_error (GPG_ERR_INV_ID); for (s=fpr, n=0; n < 20; s += 2, n++) tmp_sn[n] = xtoi_2 (s); rc = compare_fingerprint (app, 2, tmp_sn); if (rc) return rc; } if (!app->did_chv2) { char *pinvalue; rc = pincb (pincb_arg, "Decryption PIN", &pinvalue); /* pinvalue = xstrdup ("123456"); */ /* rc = 0; */ if (rc) { log_info ("PIN callback returned error: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x82, pinvalue, strlen (pinvalue)); xfree (pinvalue); if (rc) { log_error ("verify CHV2 failed\n"); rc = gpg_error (GPG_ERR_GENERAL); return rc; } app->did_chv2 = 1; } rc = iso7816_decipher (app->slot, indata, indatalen, outdata, outdatalen); return rc; } /* Select the OpenPGP application on the card in SLOT. This function must be used before any other OpenPGP application functions. */ int app_select_openpgp (APP app, unsigned char **sn, size_t *snlen) { static char const aid[] = { 0xD2, 0x76, 0x00, 0x01, 0x24, 0x01 }; int slot = app->slot; int rc; unsigned char *buffer; size_t buflen; rc = iso7816_select_application (slot, aid, sizeof aid); if (!rc) { /* fixme: get the full AID and check that the version is okay with us. */ rc = iso7816_get_data (slot, 0x004F, &buffer, &buflen); if (rc) goto leave; if (opt.verbose) { log_info ("got AID: "); log_printhex ("", buffer, buflen); } if (sn) { *sn = buffer; *snlen = buflen; app->card_version = buffer[6] << 8; app->card_version |= buffer[7]; } else xfree (buffer); if (opt.verbose > 1) dump_all_do (slot); app->fnc.learn_status = do_learn_status; app->fnc.setattr = do_setattr; app->fnc.genkey = do_genkey; app->fnc.sign = do_sign; app->fnc.auth = do_auth; app->fnc.decipher = do_decipher; app->fnc.change_pin = do_change_pin; } leave: return rc; } /* This function is a hack to retrieve essential information about the card to be displayed by simple tools. It mostly resembles what the LEARN command returns. All parameters return allocated strings or buffers or NULL if the data object is not available. All returned values are sanitized. */ int app_openpgp_cardinfo (APP app, char **serialno, char **disp_name, char **pubkey_url, unsigned char **fpr1, unsigned char **fpr2, unsigned char **fpr3) { int rc; void *relptr; unsigned char *value; size_t valuelen; if (serialno) { time_t dummy; *serialno = NULL; rc = app_get_serial_and_stamp (app, serialno, &dummy); if (rc) { log_error ("error getting serial number: %s\n", gpg_strerror (rc)); return rc; } } if (disp_name) { *disp_name = NULL; relptr = get_one_do (app->slot, 0x005B, &value, &valuelen); if (relptr) { *disp_name = make_printable_string (value, valuelen, 0); xfree (relptr); } } if (pubkey_url) { *pubkey_url = NULL; relptr = get_one_do (app->slot, 0x5F50, &value, &valuelen); if (relptr) { *pubkey_url = make_printable_string (value, valuelen, 0); xfree (relptr); } } if (fpr1) *fpr1 = NULL; if (fpr2) *fpr2 = NULL; if (fpr3) *fpr3 = NULL; relptr = get_one_do (app->slot, 0x00C5, &value, &valuelen); if (relptr && valuelen >= 60) { if (fpr1) { *fpr1 = xmalloc (20); memcpy (*fpr1, value + 0, 20); } if (fpr2) { *fpr2 = xmalloc (20); memcpy (*fpr2, value + 20, 20); } if (fpr3) { *fpr3 = xmalloc (20); memcpy (*fpr3, value + 40, 20); } } xfree (relptr); return 0; } /* This function is currently only used by the sc-copykeys program to store a key on the smartcard. APP ist the application handle, KEYNO is the number of the key and PINCB, PINCB_ARG are used to ask for the SO PIN. TEMPLATE and TEMPLATE_LEN describe a buffer with the key template to store. CREATED_AT is the timestamp used to create the fingerprint. M, MLEN is the RSA modulus and E, ELEN the RSA public exponent. This function silently overwrites an existing key.*/ int app_openpgp_storekey (APP app, int keyno, unsigned char *template, size_t template_len, time_t created_at, const unsigned char *m, size_t mlen, const unsigned char *e, size_t elen, int (*pincb)(void*, const char *, char **), void *pincb_arg) { int rc; unsigned char fprbuf[20]; if (keyno < 1 || keyno > 3) return gpg_error (GPG_ERR_INV_ID); keyno--; { char *pinvalue; rc = pincb (pincb_arg, "Admin PIN", &pinvalue); if (rc) { log_error ("error getting PIN: %s\n", gpg_strerror (rc)); return rc; } rc = iso7816_verify (app->slot, 0x83, pinvalue, strlen (pinvalue)); xfree (pinvalue); } if (rc) { log_error ("verify CHV3 failed: rc=%04X\n", rc); goto leave; } rc = iso7816_put_data (app->slot, (app->card_version > 0x0007? 0xE0 : 0xE9) + keyno, template, template_len); if (rc) { log_error ("failed to store the key: rc=%04X\n", rc); rc = gpg_error (GPG_ERR_CARD); goto leave; } /* log_printhex ("RSA n:", m, mlen); */ /* log_printhex ("RSA e:", e, elen); */ rc = store_fpr (app->slot, keyno, (u32)created_at, m, mlen, e, elen, fprbuf, app->card_version); leave: return rc; } /* Utility function for external tools: Read the public RSA key at KEYNO and return modulus and exponent in (M,MLEN) and (E,ELEN). */ int app_openpgp_readkey (APP app, int keyno, unsigned char **m, size_t *mlen, unsigned char **e, size_t *elen) { int rc; const unsigned char *keydata, *a; unsigned char *buffer; size_t buflen, keydatalen, alen; *m = NULL; *e = NULL; if (keyno < 1 || keyno > 3) return gpg_error (GPG_ERR_INV_ID); keyno--; rc = iso7816_read_public_key(app->slot, keyno == 0? "\xB6" : keyno == 1? "\xB8" : "\xA4", 2, &buffer, &buflen); if (rc) { rc = gpg_error (GPG_ERR_CARD); log_error ("reading key failed\n"); goto leave; } keydata = find_tlv (buffer, buflen, 0x7F49, &keydatalen, 0); if (!keydata) { log_error ("response does not contain the public key data\n"); rc = gpg_error (GPG_ERR_CARD); goto leave; } a = find_tlv (keydata, keydatalen, 0x0081, &alen, 0); if (!a) { log_error ("response does not contain the RSA modulus\n"); rc = gpg_error (GPG_ERR_CARD); goto leave; } *mlen = alen; *m = xmalloc (alen); memcpy (*m, a, alen); a = find_tlv (keydata, keydatalen, 0x0082, &alen, 0); if (!e) { log_error ("response does not contain the RSA public exponent\n"); rc = gpg_error (GPG_ERR_CARD); goto leave; } *elen = alen; *e = xmalloc (alen); memcpy (*e, a, alen); leave: xfree (buffer); if (rc) { xfree (*m); *m = NULL; xfree (*e); *e = NULL; } return rc; }