/* command.c - SCdaemon command handler * Copyright (C) 2001, 2002, 2003, 2004, 2005 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 #include #include #include "scdaemon.h" #include #include "app-common.h" #include "apdu.h" /* Required for apdu_*_reader (). */ /* Maximum length allowed as a PIN; used for INQUIRE NEEDPIN */ #define MAXLEN_PIN 100 /* We keep track of the primary client using scdaemon. This one will for example receive signal on card change. */ static ctrl_t primary_connection; #define set_error(e,t) assuan_set_error (ctx, ASSUAN_ ## e, (t)) /* Macro to flag a a removed card. */ #define TEST_CARD_REMOVAL(c,r) \ do { \ int _r = (r); \ if (gpg_err_code (_r) == GPG_ERR_CARD_NOT_PRESENT \ || gpg_err_code (_r) == GPG_ERR_CARD_REMOVED) \ (c)->server_local->card_removed = 1; \ } while (0) /* Data used to associate an Assuan context with local server data */ struct server_local_s { assuan_context_t assuan_ctx; int event_signal; /* Or 0 if not used. */ int card_removed; /* True if the card has been removed and a reset is required to continue operation. */ }; /* Check whether the option NAME appears in LINE */ static int has_option (const char *line, const char *name) { const char *s; int n = strlen (name); s = strstr (line, name); return (s && (s == line || spacep (s-1)) && (!s[n] || spacep (s+n))); } /* Reset the card and free the application context. With DO_CLOSE set to true, close the reader and don't do just a reset. */ static void do_reset (ctrl_t ctrl, int do_close) { if (ctrl->card_ctx) { card_close (ctrl->card_ctx); ctrl->card_ctx = NULL; xfree (ctrl->in_data.value); ctrl->in_data.value = NULL; } if (ctrl->app_ctx) { release_application (ctrl->app_ctx); ctrl->app_ctx = NULL; } if (ctrl->reader_slot != -1) { if (do_close || apdu_reset (ctrl->reader_slot)) { apdu_close_reader (ctrl->reader_slot); ctrl->reader_slot = -1; } } ctrl->server_local->card_removed = 0; } static void reset_notify (assuan_context_t ctx) { CTRL ctrl = assuan_get_pointer (ctx); do_reset (ctrl, 0); } static int option_handler (assuan_context_t ctx, const char *key, const char *value) { ctrl_t ctrl = assuan_get_pointer (ctx); if (!strcmp (key, "event-signal")) { /* A value of 0 is allowed to reset the event signal. */ int i = *value? atoi (value) : -1; if (i < 0) return ASSUAN_Parameter_Error; ctrl->server_local->event_signal = i; } return 0; } /* If the card has not yet been opened, do it. Note that this function returns an Assuan error, so don't map the error a second time */ static assuan_error_t open_card (ctrl_t ctrl, const char *apptype) { gpg_error_t err; int slot; /* If we ever got a card not present error code, return that. Only the SERIALNO command and a reset are able to clear from that state. */ if (ctrl->server_local->card_removed) return map_to_assuan_status (gpg_error (GPG_ERR_CARD_REMOVED)); if (ctrl->app_ctx) return 0; /* Already initialized for one specific application. */ if (ctrl->card_ctx) return 0; /* Already initialized using a card context. */ if (ctrl->reader_slot != -1) slot = ctrl->reader_slot; else slot = apdu_open_reader (opt.reader_port); ctrl->reader_slot = slot; if (slot == -1) err = gpg_error (GPG_ERR_CARD); else err = select_application (ctrl, slot, apptype, &ctrl->app_ctx); if (!ctrl->app_ctx && gpg_err_code (err) != GPG_ERR_CARD_NOT_PRESENT) { /* No application found - fall back to old mode. */ /* Note that we should rework the old code to use the application paradigma too. */ /* If an APPTYPE was requested and it is not pkcs#15, we return an error here. */ if (apptype && !(!strcmp (apptype, "P15") || !strcmp (apptype, "p15"))) err = gpg_error (GPG_ERR_NOT_SUPPORTED); else err = card_open (&ctrl->card_ctx); } if (gpg_err_code (err) == GPG_ERR_CARD_NOT_PRESENT) ctrl->server_local->card_removed = 1; return map_to_assuan_status (err); } /* Do the percent and plus/space unescaping in place and return the length of the valid buffer. */ static size_t percent_plus_unescape (unsigned char *string) { unsigned char *p = string; size_t n = 0; while (*string) { if (*string == '%' && string[1] && string[2]) { string++; *p++ = xtoi_2 (string); n++; string+= 2; } else if (*string == '+') { *p++ = ' '; n++; string++; } else { *p++ = *string++; n++; } } return n; } /* SERIALNO [APPTYPE] Return the serial number of the card using a status reponse. This functon should be used to check for the presence of a card. If APPTYPE is given, an application of that type is selected and an error is returned if the application is not supported or available. The default is to auto-select the application using a hardwired preference system. Note, that a future extension to this function may allow to specify a list and order of applications to try. This function is special in that it can be used to reset the card. Most other functions will return an error when a card change has been detected and the use of this function is therefore required. Background: We want to keep the client clear of handling card changes between operations; i.e. the client can assume that all operations are done on the same card unless he calls this function. */ static int cmd_serialno (assuan_context_t ctx, char *line) { ctrl_t ctrl = assuan_get_pointer (ctx); int rc = 0; char *serial_and_stamp; char *serial; time_t stamp; /* Clear the remove flag so that the open_card is able to reread it. */ /* FIXME: We can't do that if we are in a locked state. Retrun an appropriate erro r in that case. IF the card has not been removed we may very well continue. */ if (ctrl->server_local->card_removed) do_reset (ctrl, 0); if ((rc = open_card (ctrl, *line? line:NULL))) return rc; if (ctrl->app_ctx) rc = app_get_serial_and_stamp (ctrl->app_ctx, &serial, &stamp); else rc = card_get_serial_and_stamp (ctrl->card_ctx, &serial, &stamp); if (rc) return map_to_assuan_status (rc); rc = asprintf (&serial_and_stamp, "%s %lu", serial, (unsigned long)stamp); xfree (serial); if (rc < 0) return ASSUAN_Out_Of_Core; rc = 0; assuan_write_status (ctx, "SERIALNO", serial_and_stamp); free (serial_and_stamp); return 0; } /* LEARN [--force] Learn all useful information of the currently inserted card. When used without the force options, the command might do an INQUIRE like this: INQUIRE KNOWNCARDP The client should just send an "END" if the processing should go on or a "CANCEL" to force the function to terminate with a Cancel error message. The response of this command is a list of status lines formatted as this: S APPTYPE This returns the type of the application, currently the strings: P15 = PKCS-15 structure used DINSIG = DIN SIG OPENPGP = OpenPGP card are implemented. These strings are aliases for the AID S KEYPAIRINFO If there is no certificate yet stored on the card a single "X" is returned as the keygrip. In addition to the keypair info, information about all certificates stored on the card is also returned: S CERTINFO Where CERTTYPE is a number indicating the type of certificate: 0 := Unknown 100 := Regular X.509 cert 101 := Trusted X.509 cert 102 := Useful X.509 cert 110 := Root CA cert (DINSIG) For certain cards, more information will be returned: S KEY-FPR For OpenPGP cards this returns the stored fingerprints of the keys. This can be used check whether a key is available on the card. NO may be 1, 2 or 3. S CA-FPR Similar to above, these are the fingerprints of keys assumed to be ultimately trusted. S DISP-NAME The name of the card holder as stored on the card; percent escaping takes place, spaces are encoded as '+' S PUBKEY-URL The URL to be used for locating the entire public key. Note, that this function may be even be used on a locked card. */ static int cmd_learn (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc = 0; int idx; if ((rc = open_card (ctrl, NULL))) return rc; /* Unless the force option is used we try a shortcut by identifying the card using a serial number and inquiring the client with that. The client may choose to cancel the operation if he already knows about this card */ { char *serial_and_stamp; char *serial; time_t stamp; if (ctrl->app_ctx) rc = app_get_serial_and_stamp (ctrl->app_ctx, &serial, &stamp); else rc = card_get_serial_and_stamp (ctrl->card_ctx, &serial, &stamp); if (rc) return map_to_assuan_status (rc); rc = asprintf (&serial_and_stamp, "%s %lu", serial, (unsigned long)stamp); xfree (serial); if (rc < 0) return ASSUAN_Out_Of_Core; rc = 0; assuan_write_status (ctx, "SERIALNO", serial_and_stamp); if (!has_option (line, "--force")) { char *command; rc = asprintf (&command, "KNOWNCARDP %s", serial_and_stamp); if (rc < 0) { free (serial_and_stamp); return ASSUAN_Out_Of_Core; } rc = 0; rc = assuan_inquire (ctx, command, NULL, NULL, 0); free (command); /* (must use standard free here) */ if (rc) { if (rc != ASSUAN_Canceled) log_error ("inquire KNOWNCARDP failed: %s\n", assuan_strerror (rc)); free (serial_and_stamp); return rc; } /* not canceled, so we have to proceeed */ } free (serial_and_stamp); } /* If we are using the modern application paradigma, let the application print out its collection of useful status information. */ if (!rc && ctrl->app_ctx) rc = app_write_learn_status (ctrl->app_ctx, ctrl); /* Return information about the certificates. FIXME: Move this into an app-p15.c*/ for (idx=0; !rc && !ctrl->app_ctx; idx++) { char *certid; int certtype; rc = card_enum_certs (ctrl->card_ctx, idx, &certid, &certtype); if (!rc) { char *buf; buf = xtrymalloc (40 + 1 + strlen (certid) + 1); if (!buf) rc = gpg_error (gpg_err_code_from_errno (errno)); else { sprintf (buf, "%d %s", certtype, certid); assuan_write_status (ctx, "CERTINFO", buf); xfree (buf); } } xfree (certid); } if (rc == -1) rc = 0; /* Return information about the keys. FIXME: Move this into an app-p15.c */ for (idx=0; !rc && !ctrl->app_ctx; idx++) { unsigned char keygrip[20]; char *keyid; int no_cert = 0; rc = card_enum_keypairs (ctrl->card_ctx, idx, keygrip, &keyid); if (gpg_err_code (rc) == GPG_ERR_MISSING_CERT && keyid) { /* This does happen with an incomplete personalized card; i.e. during the time we have stored the key on the card but not stored the certificate; probably becuase it has not yet been received back from the CA. Note that we must release KEYID in this case. */ rc = 0; no_cert = 1; } if (!rc) { char *buf, *p; buf = p = xtrymalloc (40 + 1 + strlen (keyid) + 1); if (!buf) rc = gpg_error (gpg_err_code_from_errno (errno)); else { int i; if (no_cert) *p++ = 'X'; else { for (i=0; i < 20; i++, p += 2) sprintf (p, "%02X", keygrip[i]); } *p++ = ' '; strcpy (p, keyid); assuan_write_status (ctx, "KEYPAIRINFO", buf); xfree (buf); } } xfree (keyid); } if (rc == -1) rc = 0; TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* READCERT Note, that this function may be even be used on a locked card. */ static int cmd_readcert (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; unsigned char *cert; size_t ncert; if ((rc = open_card (ctrl, NULL))) return rc; line = xstrdup (line); /* Need a copy of the line. */ if (ctrl->app_ctx) { rc = app_readcert (ctrl->app_ctx, line, &cert, &ncert); if (rc) log_error ("app_readcert failed: %s\n", gpg_strerror (rc)); } else { rc = card_read_cert (ctrl->card_ctx, line, &cert, &ncert); if (rc) log_error ("card_read_cert failed: %s\n", gpg_strerror (rc)); } xfree (line); line = NULL; if (!rc) { rc = assuan_send_data (ctx, cert, ncert); xfree (cert); if (rc) return rc; } TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* READKEY Return the public key for the given cert or key ID as an standard S-Expression. Note, that this function may be even be used on a locked card. */ static int cmd_readkey (assuan_context_t ctx, char *line) { ctrl_t ctrl = assuan_get_pointer (ctx); int rc; unsigned char *cert = NULL; size_t ncert, n; ksba_cert_t kc = NULL; ksba_sexp_t p; if ((rc = open_card (ctrl, NULL))) return rc; line = xstrdup (line); /* Need a copy of the line. */ if (ctrl->app_ctx) { unsigned char *pk; size_t pklen; /* If the application supports the READKEY function we use that. Otherwise we use the old way by extracting it from the certificate. */ rc = app_readkey (ctrl->app_ctx, line, &pk, &pklen); if (!rc) { /* Yeah, got that key - send it back. */ rc = assuan_send_data (ctx, pk, pklen); xfree (pk); rc = map_assuan_err (rc); xfree (line); line = NULL; goto leave; } if (gpg_err_code (rc) != GPG_ERR_UNSUPPORTED_OPERATION) log_error ("app_readkey failed: %s\n", gpg_strerror (rc)); else { rc = app_readcert (ctrl->app_ctx, line, &cert, &ncert); if (rc) log_error ("app_readcert failed: %s\n", gpg_strerror (rc)); } } else { rc = card_read_cert (ctrl->card_ctx, line, &cert, &ncert); if (rc) log_error ("card_read_cert failed: %s\n", gpg_strerror (rc)); } xfree (line); line = NULL; if (rc) goto leave; rc = ksba_cert_new (&kc); if (rc) { xfree (cert); goto leave; } rc = ksba_cert_init_from_mem (kc, cert, ncert); if (rc) { log_error ("failed to parse the certificate: %s\n", gpg_strerror (rc)); goto leave; } p = ksba_cert_get_public_key (kc); if (!p) { rc = gpg_error (GPG_ERR_NO_PUBKEY); goto leave; } n = gcry_sexp_canon_len (p, 0, NULL, NULL); rc = assuan_send_data (ctx, p, n); rc = map_assuan_err (rc); xfree (p); leave: ksba_cert_release (kc); xfree (cert); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* SETDATA The client should use this command to tell us the data he want to sign. */ static int cmd_setdata (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int n; char *p; unsigned char *buf; /* FIXME: If we are locked return an error. */ /* Parse the hexstring. */ for (p=line,n=0; hexdigitp (p); p++, n++) ; if (*p) return set_error (Parameter_Error, "invalid hexstring"); if (!n) return set_error (Parameter_Error, "no data given"); if ((n&1)) return set_error (Parameter_Error, "odd number of digits"); n /= 2; buf = xtrymalloc (n); if (!buf) return ASSUAN_Out_Of_Core; ctrl->in_data.value = buf; ctrl->in_data.valuelen = n; for (p=line, n=0; n < ctrl->in_data.valuelen; p += 2, n++) buf[n] = xtoi_2 (p); return 0; } static int pin_cb (void *opaque, const char *info, char **retstr) { assuan_context_t ctx = opaque; char *command; int rc; unsigned char *value; size_t valuelen; *retstr = NULL; log_debug ("asking for PIN '%s'\n", info); rc = asprintf (&command, "NEEDPIN %s", info); if (rc < 0) return gpg_error (gpg_err_code_from_errno (errno)); /* FIXME: Write an inquire function which returns the result in secure memory */ rc = assuan_inquire (ctx, command, &value, &valuelen, MAXLEN_PIN); free (command); if (rc) return map_assuan_err (rc); if (!valuelen || value[valuelen-1]) { /* We require that the returned value is an UTF-8 string */ xfree (value); return gpg_error (GPG_ERR_INV_RESPONSE); } *retstr = value; return 0; } /* PKSIGN */ static int cmd_pksign (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; unsigned char *outdata; size_t outdatalen; char *keyidstr; /* FIXME: If we are locked return an error. */ if ((rc = open_card (ctrl, NULL))) return rc; /* We have to use a copy of the key ID because the function may use the pin_cb which in turn uses the assuan line buffer and thus overwriting the original line with the keyid */ keyidstr = xtrystrdup (line); if (!keyidstr) return ASSUAN_Out_Of_Core; if (ctrl->app_ctx) rc = app_sign (ctrl->app_ctx, keyidstr, GCRY_MD_SHA1, pin_cb, ctx, ctrl->in_data.value, ctrl->in_data.valuelen, &outdata, &outdatalen); else rc = card_sign (ctrl->card_ctx, keyidstr, GCRY_MD_SHA1, pin_cb, ctx, ctrl->in_data.value, ctrl->in_data.valuelen, &outdata, &outdatalen); xfree (keyidstr); if (rc) { log_error ("card_sign failed: %s\n", gpg_strerror (rc)); } else { rc = assuan_send_data (ctx, outdata, outdatalen); xfree (outdata); if (rc) return rc; /* that is already an assuan error code */ } TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* PKAUTH */ static int cmd_pkauth (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; unsigned char *outdata; size_t outdatalen; char *keyidstr; /* FIXME: If we are locked return an error. */ if ((rc = open_card (ctrl, NULL))) return rc; if (!ctrl->app_ctx) return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION); /* We have to use a copy of the key ID because the function may use the pin_cb which in turn uses the assuan line buffer and thus overwriting the original line with the keyid */ keyidstr = xtrystrdup (line); if (!keyidstr) return ASSUAN_Out_Of_Core; rc = app_auth (ctrl->app_ctx, keyidstr, pin_cb, ctx, ctrl->in_data.value, ctrl->in_data.valuelen, &outdata, &outdatalen); xfree (keyidstr); if (rc) { log_error ("app_auth_sign failed: %s\n", gpg_strerror (rc)); } else { rc = assuan_send_data (ctx, outdata, outdatalen); xfree (outdata); if (rc) return rc; /* that is already an assuan error code */ } TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* PKDECRYPT */ static int cmd_pkdecrypt (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; unsigned char *outdata; size_t outdatalen; char *keyidstr; /* FIXME: If we are locked return an error. */ if ((rc = open_card (ctrl, NULL))) return rc; keyidstr = xtrystrdup (line); if (!keyidstr) return ASSUAN_Out_Of_Core; if (ctrl->app_ctx) rc = app_decipher (ctrl->app_ctx, keyidstr, pin_cb, ctx, ctrl->in_data.value, ctrl->in_data.valuelen, &outdata, &outdatalen); else rc = card_decipher (ctrl->card_ctx, keyidstr, pin_cb, ctx, ctrl->in_data.value, ctrl->in_data.valuelen, &outdata, &outdatalen); xfree (keyidstr); if (rc) { log_error ("card_create_signature failed: %s\n", gpg_strerror (rc)); } else { rc = assuan_send_data (ctx, outdata, outdatalen); xfree (outdata); if (rc) return rc; /* that is already an assuan error code */ } TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* GETATTR This command is used to retrieve data from a smartcard. The allowed names depend on the currently selected smartcard application. NAME must be percent and '+' escaped. The value is returned through status message, see the LEARN command for details. However, the current implementation assumes that Name is not escaped; this works as long as noone uses arbitrary escaping. Note, that this function may even be used on a locked card. */ static int cmd_getattr (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; char *keyword; if ((rc = open_card (ctrl, NULL))) return rc; keyword = line; for (; *line && !spacep (line); line++) ; if (*line) *line++ = 0; /* (We ignore any garbage for now.) */ /* FIXME: Applications should not return sensistive data if the card is locked. */ rc = app_getattr (ctrl->app_ctx, ctrl, keyword); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* SETATTR This command is used to store data on a a smartcard. The allowed names and values are depend on the currently selected smartcard application. NAME and VALUE must be percent and '+' escaped. However, the curent implementation assumes that Name is not escaped; this works as long as noone uses arbitrary escaping. A PIN will be requested for most NAMEs. See the corresponding setattr function of the actually used application (app-*.c) for details. */ static int cmd_setattr (assuan_context_t ctx, char *orig_line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; char *keyword; int keywordlen; size_t nbytes; char *line, *linebuf; /* FIXME: If we are locked return an error. */ if ((rc = open_card (ctrl, NULL))) return rc; /* We need to use a copy of LINE, because PIN_CB uses the same context and thus reuses the Assuan provided LINE. */ line = linebuf = xtrystrdup (orig_line); if (!line) return ASSUAN_Out_Of_Core; keyword = line; for (keywordlen=0; *line && !spacep (line); line++, keywordlen++) ; if (*line) *line++ = 0; while (spacep (line)) line++; nbytes = percent_plus_unescape (line); rc = app_setattr (ctrl->app_ctx, keyword, pin_cb, ctx, line, nbytes); xfree (linebuf); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* GENKEY [--force] Generate a key on-card identified by NO, which is application specific. Return values are application specific. For OpenPGP cards 2 status lines are returned: S KEY-FPR S KEY-CREATED-AT S KEY-DATA [p|n] --force is required to overwriet an already existing key. The KEY-CREATED-AT is required for further processing because it is part of the hashed key material for the fingerprint. The public part of the key can also later be retrieved using the READKEY command. */ static int cmd_genkey (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; char *keyno; int force = has_option (line, "--force"); /* FIXME: If we are locked return an error. */ /* Skip over options. */ while ( *line == '-' && line[1] == '-' ) { while (*line && !spacep (line)) line++; while (spacep (line)) line++; } if (!*line) return set_error (Parameter_Error, "no key number given"); keyno = line; while (*line && !spacep (line)) line++; *line = 0; if ((rc = open_card (ctrl, NULL))) return rc; if (!ctrl->app_ctx) return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION); keyno = xtrystrdup (keyno); if (!keyno) return ASSUAN_Out_Of_Core; rc = app_genkey (ctrl->app_ctx, ctrl, keyno, force? 1:0, pin_cb, ctx); xfree (keyno); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* RANDOM Get NBYTES of random from the card and send them back as data. Note, that this function may be even be used on a locked card. */ static int cmd_random (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; size_t nbytes; unsigned char *buffer; if (!*line) return set_error (Parameter_Error, "number of requested bytes missing"); nbytes = strtoul (line, NULL, 0); if ((rc = open_card (ctrl, NULL))) return rc; if (!ctrl->app_ctx) return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION); buffer = xtrymalloc (nbytes); if (!buffer) return ASSUAN_Out_Of_Core; rc = app_get_challenge (ctrl->app_ctx, nbytes, buffer); if (!rc) { rc = assuan_send_data (ctx, buffer, nbytes); xfree (buffer); return rc; /* that is already an assuan error code */ } xfree (buffer); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* PASSWD [--reset] Change the PIN or reset thye retry counter of the card holder verfication vector CHVNO. */ static int cmd_passwd (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; char *chvnostr; int reset_mode = has_option (line, "--reset"); /* FIXME: If we are locked return an error. */ /* Skip over options. */ while (*line == '-' && line[1] == '-') { while (*line && !spacep (line)) line++; while (spacep (line)) line++; } if (!*line) return set_error (Parameter_Error, "no CHV number given"); chvnostr = line; while (*line && !spacep (line)) line++; *line = 0; if ((rc = open_card (ctrl, NULL))) return rc; if (!ctrl->app_ctx) return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION); chvnostr = xtrystrdup (chvnostr); if (!chvnostr) return ASSUAN_Out_Of_Core; rc = app_change_pin (ctrl->app_ctx, ctrl, chvnostr, reset_mode, pin_cb, ctx); if (rc) log_error ("command passwd failed: %s\n", gpg_strerror (rc)); xfree (chvnostr); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* CHECKPIN */ static int cmd_checkpin (assuan_context_t ctx, char *line) { CTRL ctrl = assuan_get_pointer (ctx); int rc; char *keyidstr; /* FIXME: If we are locked return an error. */ if ((rc = open_card (ctrl, NULL))) return rc; if (!ctrl->app_ctx) return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION); /* We have to use a copy of the key ID because the function may use the pin_cb which in turn uses the assuan line buffer and thus overwriting the original line with the keyid. */ keyidstr = xtrystrdup (line); if (!keyidstr) return ASSUAN_Out_Of_Core; rc = app_check_pin (ctrl->app_ctx, keyidstr, pin_cb, ctx); xfree (keyidstr); if (rc) log_error ("app_check_pin failed: %s\n", gpg_strerror (rc)); TEST_CARD_REMOVAL (ctrl, rc); return map_to_assuan_status (rc); } /* Tell the assuan library about our commands */ static int register_commands (ASSUAN_CONTEXT ctx) { static struct { const char *name; int (*handler)(ASSUAN_CONTEXT, char *line); } table[] = { { "SERIALNO", cmd_serialno }, { "LEARN", cmd_learn }, { "READCERT", cmd_readcert }, { "READKEY", cmd_readkey }, { "SETDATA", cmd_setdata }, { "PKSIGN", cmd_pksign }, { "PKAUTH", cmd_pkauth }, { "PKDECRYPT", cmd_pkdecrypt }, { "INPUT", NULL }, { "OUTPUT", NULL }, { "GETATTR", cmd_getattr }, { "SETATTR", cmd_setattr }, { "GENKEY", cmd_genkey }, { "RANDOM", cmd_random }, { "PASSWD", cmd_passwd }, { "CHECKPIN", cmd_checkpin }, { NULL } }; int i, rc; for (i=0; table[i].name; i++) { rc = assuan_register_command (ctx, table[i].name, table[i].handler); if (rc) return rc; } assuan_set_hello_line (ctx, "GNU Privacy Guard's Smartcard server ready"); assuan_register_reset_notify (ctx, reset_notify); assuan_register_option_handler (ctx, option_handler); return 0; } /* Startup the server. If LISTEN_FD is given as -1, this is simple piper server, otherwise it is a regular server */ void scd_command_handler (int listen_fd) { int rc; ASSUAN_CONTEXT ctx; struct server_control_s ctrl; memset (&ctrl, 0, sizeof ctrl); scd_init_default_ctrl (&ctrl); if (listen_fd == -1) { int filedes[2]; filedes[0] = 0; filedes[1] = 1; rc = assuan_init_pipe_server (&ctx, filedes); } else { rc = assuan_init_socket_server (&ctx, listen_fd); } if (rc) { log_error ("failed to initialize the server: %s\n", assuan_strerror(rc)); scd_exit (2); } rc = register_commands (ctx); if (rc) { log_error ("failed to register commands with Assuan: %s\n", assuan_strerror(rc)); scd_exit (2); } assuan_set_pointer (ctx, &ctrl); ctrl.server_local = xcalloc (1, sizeof *ctrl.server_local); ctrl.server_local->assuan_ctx = ctx; if (DBG_ASSUAN) assuan_set_log_stream (ctx, log_get_stream ()); /* Store the primary connection's assuan context. */ if (!primary_connection) primary_connection = &ctrl; /* We open the reader right at startup so that the ticker is able to update the status file. */ if (ctrl.reader_slot == -1) ctrl.reader_slot = apdu_open_reader (opt.reader_port); /* Command processing loop. */ for (;;) { rc = assuan_accept (ctx); if (rc == -1) { break; } else if (rc) { log_info ("Assuan accept problem: %s\n", assuan_strerror (rc)); break; } rc = assuan_process (ctx); if (rc) { log_info ("Assuan processing failed: %s\n", assuan_strerror (rc)); continue; } } /* The next client will be the primary conenction if this one terminates. */ if (primary_connection == &ctrl) primary_connection = NULL; do_reset (&ctrl, 1); /* Cleanup. */ assuan_deinit_server (ctx); } /* Send a line with status information via assuan and escape all given buffers. The variable elements are pairs of (char *, size_t), terminated with a (NULL, 0). */ void send_status_info (CTRL ctrl, const char *keyword, ...) { va_list arg_ptr; const unsigned char *value; size_t valuelen; char buf[950], *p; size_t n; ASSUAN_CONTEXT ctx = ctrl->server_local->assuan_ctx; va_start (arg_ptr, keyword); p = buf; n = 0; while ( (value = va_arg (arg_ptr, const unsigned char *)) ) { valuelen = va_arg (arg_ptr, size_t); if (!valuelen) continue; /* empty buffer */ if (n) { *p++ = ' '; n++; } for ( ; valuelen && n < DIM (buf)-2; n++, valuelen--, value++) { if (*value < ' ' || *value == '+') { sprintf (p, "%%%02X", *value); p += 3; } else if (*value == ' ') *p++ = '+'; else *p++ = *value; } } *p = 0; assuan_write_status (ctx, keyword, buf); va_end (arg_ptr); } /* This fucntion is called by the ticker thread to check for changes of the reader stati. It updates the reader status files and if requested by the caller also send a signal to the caller. */ void scd_update_reader_status_file (void) { static struct { int any; unsigned int status; unsigned int changed; } last[10]; int slot; int used; unsigned int status, changed; /* Note, that we only try to get the status, because it does not make sense to wait here for a operation to complete. If we are busy working with a card, delays in the status file update should be acceptable. */ for (slot=0; (slot < DIM(last) &&!apdu_enum_reader (slot, &used)); slot++) if (used && !apdu_get_status (slot, 0, &status, &changed)) { if (!last[slot].any || last[slot].status != status || last[slot].changed != changed ) { char *fname; char templ[50]; FILE *fp; log_info ("updating status of slot %d to 0x%04X\n", slot, status); sprintf (templ, "reader_%d.status", slot); fname = make_filename (opt.homedir, templ, NULL ); fp = fopen (fname, "w"); if (fp) { fprintf (fp, "%s\n", (status & 1)? "USABLE": (status & 4)? "ACTIVE": (status & 2)? "PRESENT": "NOCARD"); fclose (fp); } xfree (fname); /* Set the card removed flag. We will set this on any card change because a reset or SERIALNO request must be done in any case. */ if (primary_connection && primary_connection->server_local && last[slot].any ) primary_connection->server_local->card_removed = 1; last[slot].any = 1; last[slot].status = status; last[slot].changed = changed; /* Send a signal to the primary client, if any. */ if (primary_connection && primary_connection->server_local && primary_connection->server_local->assuan_ctx) { pid_t pid = assuan_get_pid (primary_connection ->server_local->assuan_ctx); int signo = primary_connection->server_local->event_signal; log_info ("client pid is %d, sending signal %d\n", pid, signo); #ifndef HAVE_W32_SYSTEM if (pid != (pid_t)(-1) && pid && signo > 0) kill (pid, signo); #endif } } } }