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-rw-r--r--sm/call-agent.c1455
1 files changed, 1455 insertions, 0 deletions
diff --git a/sm/call-agent.c b/sm/call-agent.c
new file mode 100644
index 0000000..0c271d9
--- /dev/null
+++ b/sm/call-agent.c
@@ -0,0 +1,1455 @@
+/* call-agent.c - Divert GPGSM operations to the agent
+ * Copyright (C) 2001, 2002, 2003, 2005, 2007,
+ * 2008, 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <time.h>
+#include <assert.h>
+#ifdef HAVE_LOCALE_H
+#include <locale.h>
+#endif
+
+#include "gpgsm.h"
+#include <gcrypt.h>
+#include <assuan.h>
+#include "../common/i18n.h"
+#include "../common/asshelp.h"
+#include "keydb.h" /* fixme: Move this to import.c */
+#include "../common/membuf.h"
+#include "../common/shareddefs.h"
+#include "passphrase.h"
+
+
+static assuan_context_t agent_ctx = NULL;
+
+
+struct cipher_parm_s
+{
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ const unsigned char *ciphertext;
+ size_t ciphertextlen;
+};
+
+struct genkey_parm_s
+{
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ const unsigned char *sexp;
+ size_t sexplen;
+};
+
+struct learn_parm_s
+{
+ int error;
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ membuf_t *data;
+};
+
+struct import_key_parm_s
+{
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ const void *key;
+ size_t keylen;
+};
+
+struct default_inq_parm_s
+{
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+};
+
+
+/* Print a warning if the server's version number is less than our
+ version number. Returns an error code on a connection problem. */
+static gpg_error_t
+warn_version_mismatch (ctrl_t ctrl, assuan_context_t ctx,
+ const char *servername, int mode)
+{
+ gpg_error_t err;
+ char *serverversion;
+ const char *myversion = strusage (13);
+
+ err = get_assuan_server_version (ctx, mode, &serverversion);
+ if (err)
+ log_error (_("error getting version from '%s': %s\n"),
+ servername, gpg_strerror (err));
+ else if (compare_version_strings (serverversion, myversion) < 0)
+ {
+ char *warn;
+
+ warn = xtryasprintf (_("server '%s' is older than us (%s < %s)"),
+ servername, serverversion, myversion);
+ if (!warn)
+ err = gpg_error_from_syserror ();
+ else
+ {
+ log_info (_("WARNING: %s\n"), warn);
+ if (!opt.quiet)
+ {
+ log_info (_("Note: Outdated servers may lack important"
+ " security fixes.\n"));
+ log_info (_("Note: Use the command \"%s\" to restart them.\n"),
+ "gpgconf --kill all");
+ }
+ gpgsm_status2 (ctrl, STATUS_WARNING, "server_version_mismatch 0",
+ warn, NULL);
+ xfree (warn);
+ }
+ }
+ xfree (serverversion);
+ return err;
+}
+
+
+/* Try to connect to the agent via socket or fork it off and work by
+ pipes. Handle the server's initial greeting */
+static int
+start_agent (ctrl_t ctrl)
+{
+ int rc;
+
+ if (agent_ctx)
+ rc = 0; /* fixme: We need a context for each thread or
+ serialize the access to the agent (which is
+ suitable given that the agent is not MT. */
+ else
+ {
+ rc = start_new_gpg_agent (&agent_ctx,
+ GPG_ERR_SOURCE_DEFAULT,
+ opt.agent_program,
+ opt.lc_ctype, opt.lc_messages,
+ opt.session_env,
+ opt.autostart, opt.verbose, DBG_IPC,
+ gpgsm_status2, ctrl);
+
+ if (!opt.autostart && gpg_err_code (rc) == GPG_ERR_NO_AGENT)
+ {
+ static int shown;
+
+ if (!shown)
+ {
+ shown = 1;
+ log_info (_("no gpg-agent running in this session\n"));
+ }
+ }
+ else if (!rc && !(rc = warn_version_mismatch (ctrl, agent_ctx,
+ GPG_AGENT_NAME, 0)))
+ {
+ /* Tell the agent that we support Pinentry notifications. No
+ error checking so that it will work also with older
+ agents. */
+ assuan_transact (agent_ctx, "OPTION allow-pinentry-notify",
+ NULL, NULL, NULL, NULL, NULL, NULL);
+
+ /* Pass on the pinentry mode. */
+ if (opt.pinentry_mode)
+ {
+ char *tmp = xasprintf ("OPTION pinentry-mode=%s",
+ str_pinentry_mode (opt.pinentry_mode));
+ rc = assuan_transact (agent_ctx, tmp,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ xfree (tmp);
+ if (rc)
+ log_error ("setting pinentry mode '%s' failed: %s\n",
+ str_pinentry_mode (opt.pinentry_mode),
+ gpg_strerror (rc));
+ }
+
+ /* Pass on the request origin. */
+ if (opt.request_origin)
+ {
+ char *tmp = xasprintf ("OPTION pretend-request-origin=%s",
+ str_request_origin (opt.request_origin));
+ rc = assuan_transact (agent_ctx, tmp,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ xfree (tmp);
+ if (rc)
+ log_error ("setting request origin '%s' failed: %s\n",
+ str_request_origin (opt.request_origin),
+ gpg_strerror (rc));
+ }
+
+ /* In DE_VS mode under Windows we require that the JENT RNG
+ * is active. */
+#ifdef HAVE_W32_SYSTEM
+ if (!rc && opt.compliance == CO_DE_VS)
+ {
+ if (assuan_transact (agent_ctx, "GETINFO jent_active",
+ NULL, NULL, NULL, NULL, NULL, NULL))
+ {
+ rc = gpg_error (GPG_ERR_FORBIDDEN);
+ log_error (_("%s is not compliant with %s mode\n"),
+ GPG_AGENT_NAME,
+ gnupg_compliance_option_string (opt.compliance));
+ gpgsm_status_with_error (ctrl, STATUS_ERROR,
+ "random-compliance", rc);
+ }
+ }
+#endif /*HAVE_W32_SYSTEM*/
+
+ }
+ }
+
+ if (!ctrl->agent_seen)
+ {
+ ctrl->agent_seen = 1;
+ audit_log_ok (ctrl->audit, AUDIT_AGENT_READY, rc);
+ }
+
+ return rc;
+}
+
+/* This is the default inquiry callback. It mainly handles the
+ Pinentry notifications. */
+static gpg_error_t
+default_inq_cb (void *opaque, const char *line)
+{
+ gpg_error_t err = 0;
+ struct default_inq_parm_s *parm = opaque;
+ ctrl_t ctrl = parm->ctrl;
+
+ if (has_leading_keyword (line, "PINENTRY_LAUNCHED"))
+ {
+ err = gpgsm_proxy_pinentry_notify (ctrl, line);
+ if (err)
+ log_error (_("failed to proxy %s inquiry to client\n"),
+ "PINENTRY_LAUNCHED");
+ /* We do not pass errors to avoid breaking other code. */
+ }
+ else if ((has_leading_keyword (line, "PASSPHRASE")
+ || has_leading_keyword (line, "NEW_PASSPHRASE"))
+ && opt.pinentry_mode == PINENTRY_MODE_LOOPBACK
+ && have_static_passphrase ())
+ {
+ const char *s = get_static_passphrase ();
+ err = assuan_send_data (parm->ctx, s, strlen (s));
+ }
+ else
+ log_error ("ignoring gpg-agent inquiry '%s'\n", line);
+
+ return err;
+}
+
+
+
+
+/* Call the agent to do a sign operation using the key identified by
+ the hex string KEYGRIP. */
+int
+gpgsm_agent_pksign (ctrl_t ctrl, const char *keygrip, const char *desc,
+ unsigned char *digest, size_t digestlen, int digestalgo,
+ unsigned char **r_buf, size_t *r_buflen )
+{
+ int rc, i;
+ char *p, line[ASSUAN_LINELENGTH];
+ membuf_t data;
+ size_t len;
+ struct default_inq_parm_s inq_parm;
+
+ *r_buf = NULL;
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ if (digestlen*2 + 50 > DIM(line))
+ return gpg_error (GPG_ERR_GENERAL);
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ snprintf (line, DIM(line), "SIGKEY %s", keygrip);
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ if (desc)
+ {
+ snprintf (line, DIM(line), "SETKEYDESC %s", desc);
+ rc = assuan_transact (agent_ctx, line,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+ }
+
+ sprintf (line, "SETHASH %d ", digestalgo);
+ p = line + strlen (line);
+ for (i=0; i < digestlen ; i++, p += 2 )
+ sprintf (p, "%02X", digest[i]);
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ init_membuf (&data, 1024);
+ rc = assuan_transact (agent_ctx, "PKSIGN",
+ put_membuf_cb, &data, default_inq_cb, &inq_parm,
+ NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return rc;
+ }
+ *r_buf = get_membuf (&data, r_buflen);
+
+ if (!gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL))
+ {
+ xfree (*r_buf); *r_buf = NULL;
+ return gpg_error (GPG_ERR_INV_VALUE);
+ }
+
+ return *r_buf? 0 : out_of_core ();
+}
+
+
+/* Call the scdaemon to do a sign operation using the key identified by
+ the hex string KEYID. */
+int
+gpgsm_scd_pksign (ctrl_t ctrl, const char *keyid, const char *desc,
+ unsigned char *digest, size_t digestlen, int digestalgo,
+ unsigned char **r_buf, size_t *r_buflen )
+{
+ int rc, i;
+ char *p, line[ASSUAN_LINELENGTH];
+ membuf_t data;
+ size_t len;
+ const char *hashopt;
+ unsigned char *sigbuf;
+ size_t sigbuflen;
+ struct default_inq_parm_s inq_parm;
+
+ (void)desc;
+
+ *r_buf = NULL;
+
+ switch(digestalgo)
+ {
+ case GCRY_MD_SHA1: hashopt = "--hash=sha1"; break;
+ case GCRY_MD_RMD160:hashopt = "--hash=rmd160"; break;
+ case GCRY_MD_MD5: hashopt = "--hash=md5"; break;
+ case GCRY_MD_SHA256:hashopt = "--hash=sha256"; break;
+ default:
+ return gpg_error (GPG_ERR_DIGEST_ALGO);
+ }
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ if (digestlen*2 + 50 > DIM(line))
+ return gpg_error (GPG_ERR_GENERAL);
+
+ p = stpcpy (line, "SCD SETDATA " );
+ for (i=0; i < digestlen ; i++, p += 2 )
+ sprintf (p, "%02X", digest[i]);
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ init_membuf (&data, 1024);
+
+ snprintf (line, DIM(line), "SCD PKSIGN %s %s", hashopt, keyid);
+ rc = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data, default_inq_cb, &inq_parm,
+ NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return rc;
+ }
+ sigbuf = get_membuf (&data, &sigbuflen);
+
+ /* Create an S-expression from it which is formatted like this:
+ "(7:sig-val(3:rsa(1:sSIGBUFLEN:SIGBUF)))" Fixme: If a card ever
+ creates non-RSA keys we need to change things. */
+ *r_buflen = 21 + 11 + sigbuflen + 4;
+ p = xtrymalloc (*r_buflen);
+ *r_buf = (unsigned char*)p;
+ if (!p)
+ {
+ xfree (sigbuf);
+ return 0;
+ }
+ p = stpcpy (p, "(7:sig-val(3:rsa(1:s" );
+ sprintf (p, "%u:", (unsigned int)sigbuflen);
+ p += strlen (p);
+ memcpy (p, sigbuf, sigbuflen);
+ p += sigbuflen;
+ strcpy (p, ")))");
+ xfree (sigbuf);
+
+ assert (gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL));
+ return 0;
+}
+
+
+
+
+/* Handle a CIPHERTEXT inquiry. Note, we only send the data,
+ assuan_transact takes care of flushing and writing the end */
+static gpg_error_t
+inq_ciphertext_cb (void *opaque, const char *line)
+{
+ struct cipher_parm_s *parm = opaque;
+ int rc;
+
+ if (has_leading_keyword (line, "CIPHERTEXT"))
+ {
+ assuan_begin_confidential (parm->ctx);
+ rc = assuan_send_data (parm->ctx, parm->ciphertext, parm->ciphertextlen);
+ assuan_end_confidential (parm->ctx);
+ }
+ else
+ {
+ struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
+ rc = default_inq_cb (&inq_parm, line);
+ }
+
+ return rc;
+}
+
+
+/* Call the agent to do a decrypt operation using the key identified by
+ the hex string KEYGRIP. */
+int
+gpgsm_agent_pkdecrypt (ctrl_t ctrl, const char *keygrip, const char *desc,
+ ksba_const_sexp_t ciphertext,
+ char **r_buf, size_t *r_buflen )
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+ membuf_t data;
+ struct cipher_parm_s cipher_parm;
+ size_t n, len;
+ char *p, *buf, *endp;
+ size_t ciphertextlen;
+
+ if (!keygrip || strlen(keygrip) != 40 || !ciphertext || !r_buf || !r_buflen)
+ return gpg_error (GPG_ERR_INV_VALUE);
+ *r_buf = NULL;
+
+ ciphertextlen = gcry_sexp_canon_len (ciphertext, 0, NULL, NULL);
+ if (!ciphertextlen)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ assert ( DIM(line) >= 50 );
+ snprintf (line, DIM(line), "SETKEY %s", keygrip);
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ if (desc)
+ {
+ snprintf (line, DIM(line), "SETKEYDESC %s", desc);
+ rc = assuan_transact (agent_ctx, line,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+ }
+
+ init_membuf (&data, 1024);
+ cipher_parm.ctrl = ctrl;
+ cipher_parm.ctx = agent_ctx;
+ cipher_parm.ciphertext = ciphertext;
+ cipher_parm.ciphertextlen = ciphertextlen;
+ rc = assuan_transact (agent_ctx, "PKDECRYPT",
+ put_membuf_cb, &data,
+ inq_ciphertext_cb, &cipher_parm, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return rc;
+ }
+
+ /* Make sure it is 0 terminated so we can invoke strtoul safely. */
+ put_membuf (&data, "", 1);
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error (GPG_ERR_ENOMEM);
+ assert (len); /* (we forced Nul termination.) */
+
+ if (*buf == '(')
+ {
+ if (len < 13 || memcmp (buf, "(5:value", 8) ) /* "(5:valueN:D)\0" */
+ return gpg_error (GPG_ERR_INV_SEXP);
+ /* Trim any spurious trailing Nuls: */
+ while (buf[len-1] == 0)
+ len--;
+ if (buf[len-1] != ')')
+ return gpg_error (GPG_ERR_INV_SEXP);
+ len--; /* Drop the final close-paren: */
+ p = buf + 8; /* Skip leading parenthesis and the value tag. */
+ len -= 8; /* Count only the data of the second part. */
+ }
+ else
+ {
+ /* For compatibility with older gpg-agents handle the old style
+ incomplete S-exps. */
+ len--; /* Do not count the Nul. */
+ p = buf;
+ }
+
+ n = strtoul (p, &endp, 10);
+ if (!n || *endp != ':')
+ return gpg_error (GPG_ERR_INV_SEXP);
+ endp++;
+ if (endp-p+n != len)
+ return gpg_error (GPG_ERR_INV_SEXP); /* Oops: Inconsistent S-Exp. */
+
+ memmove (buf, endp, n);
+
+ *r_buflen = n;
+ *r_buf = buf;
+ return 0;
+}
+
+
+
+
+
+/* Handle a KEYPARMS inquiry. Note, we only send the data,
+ assuan_transact takes care of flushing and writing the end */
+static gpg_error_t
+inq_genkey_parms (void *opaque, const char *line)
+{
+ struct genkey_parm_s *parm = opaque;
+ int rc;
+
+ if (has_leading_keyword (line, "KEYPARAM"))
+ {
+ rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
+ }
+ else
+ {
+ struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
+ rc = default_inq_cb (&inq_parm, line);
+ }
+
+ return rc;
+}
+
+
+
+/* Call the agent to generate a new key */
+int
+gpgsm_agent_genkey (ctrl_t ctrl,
+ ksba_const_sexp_t keyparms, ksba_sexp_t *r_pubkey)
+{
+ int rc;
+ struct genkey_parm_s gk_parm;
+ membuf_t data;
+ size_t len;
+ unsigned char *buf;
+ gnupg_isotime_t timebuf;
+ char line[ASSUAN_LINELENGTH];
+
+ *r_pubkey = NULL;
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ init_membuf (&data, 1024);
+ gk_parm.ctrl = ctrl;
+ gk_parm.ctx = agent_ctx;
+ gk_parm.sexp = keyparms;
+ gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
+ if (!gk_parm.sexplen)
+ return gpg_error (GPG_ERR_INV_VALUE);
+ gnupg_get_isotime (timebuf);
+ snprintf (line, sizeof line, "GENKEY --timestamp=%s", timebuf);
+ rc = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data,
+ inq_genkey_parms, &gk_parm, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return rc;
+ }
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error (GPG_ERR_ENOMEM);
+ if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
+ {
+ xfree (buf);
+ return gpg_error (GPG_ERR_INV_SEXP);
+ }
+ *r_pubkey = buf;
+ return 0;
+}
+
+
+/* Call the agent to read the public key part for a given keygrip. If
+ FROMCARD is true, the key is directly read from the current
+ smartcard. In this case HEXKEYGRIP should be the keyID
+ (e.g. OPENPGP.3). */
+int
+gpgsm_agent_readkey (ctrl_t ctrl, int fromcard, const char *hexkeygrip,
+ ksba_sexp_t *r_pubkey)
+{
+ int rc;
+ membuf_t data;
+ size_t len;
+ unsigned char *buf;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ *r_pubkey = NULL;
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ rc = assuan_transact (agent_ctx, "RESET",NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+
+ snprintf (line, DIM(line), "%sREADKEY %s",
+ fromcard? "SCD ":"", hexkeygrip);
+
+ init_membuf (&data, 1024);
+ rc = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return rc;
+ }
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error (GPG_ERR_ENOMEM);
+ if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
+ {
+ xfree (buf);
+ return gpg_error (GPG_ERR_INV_SEXP);
+ }
+ *r_pubkey = buf;
+ return 0;
+}
+
+
+
+/* Take the serial number from LINE and return it verbatim in a newly
+ allocated string. We make sure that only hex characters are
+ returned. */
+static char *
+store_serialno (const char *line)
+{
+ const char *s;
+ char *p;
+
+ for (s=line; hexdigitp (s); s++)
+ ;
+ p = xtrymalloc (s + 1 - line);
+ if (p)
+ {
+ memcpy (p, line, s-line);
+ p[s-line] = 0;
+ }
+ return p;
+}
+
+
+/* Callback for the gpgsm_agent_serialno function. */
+static gpg_error_t
+scd_serialno_status_cb (void *opaque, const char *line)
+{
+ char **r_serialno = opaque;
+ const char *keyword = line;
+ int keywordlen;
+
+ for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
+ ;
+ while (spacep (line))
+ line++;
+
+ if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
+ {
+ xfree (*r_serialno);
+ *r_serialno = store_serialno (line);
+ }
+
+ return 0;
+}
+
+
+/* Call the agent to read the serial number of the current card. */
+int
+gpgsm_agent_scd_serialno (ctrl_t ctrl, char **r_serialno)
+{
+ int rc;
+ char *serialno = NULL;
+ struct default_inq_parm_s inq_parm;
+
+ *r_serialno = NULL;
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ rc = assuan_transact (agent_ctx, "SCD SERIALNO",
+ NULL, NULL,
+ default_inq_cb, &inq_parm,
+ scd_serialno_status_cb, &serialno);
+ if (!rc && !serialno)
+ rc = gpg_error (GPG_ERR_INTERNAL);
+ if (rc)
+ {
+ xfree (serialno);
+ return rc;
+ }
+ *r_serialno = serialno;
+ return 0;
+}
+
+
+
+/* Callback for the gpgsm_agent_serialno function. */
+static gpg_error_t
+scd_keypairinfo_status_cb (void *opaque, const char *line)
+{
+ strlist_t *listaddr = opaque;
+ const char *keyword = line;
+ int keywordlen;
+ strlist_t sl;
+ char *p;
+
+ for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
+ ;
+ while (spacep (line))
+ line++;
+
+ if (keywordlen == 11 && !memcmp (keyword, "KEYPAIRINFO", keywordlen))
+ {
+ sl = append_to_strlist (listaddr, line);
+ p = sl->d;
+ /* Make sure that we only have two tokens so that future
+ * extensions of the format won't change the format expected by
+ * the caller. */
+ while (*p && !spacep (p))
+ p++;
+ if (*p)
+ {
+ while (spacep (p))
+ p++;
+ while (*p && !spacep (p))
+ p++;
+ if (*p)
+ {
+ *p++ = 0;
+ while (spacep (p))
+ p++;
+ while (*p && !spacep (p))
+ {
+ switch (*p++)
+ {
+ case 'c': sl->flags |= GCRY_PK_USAGE_CERT; break;
+ case 's': sl->flags |= GCRY_PK_USAGE_SIGN; break;
+ case 'e': sl->flags |= GCRY_PK_USAGE_ENCR; break;
+ case 'a': sl->flags |= GCRY_PK_USAGE_AUTH; break;
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+
+/* Call the agent to read the keypairinfo lines of the current card.
+ The list is returned as a string made up of the keygrip, a space
+ and the keyid. The flags of the string carry the usage bits. */
+int
+gpgsm_agent_scd_keypairinfo (ctrl_t ctrl, strlist_t *r_list)
+{
+ int rc;
+ strlist_t list = NULL;
+ struct default_inq_parm_s inq_parm;
+
+ *r_list = NULL;
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ rc = assuan_transact (agent_ctx, "SCD LEARN --keypairinfo",
+ NULL, NULL,
+ default_inq_cb, &inq_parm,
+ scd_keypairinfo_status_cb, &list);
+ if (!rc && !list)
+ rc = gpg_error (GPG_ERR_NO_DATA);
+ if (rc)
+ {
+ free_strlist (list);
+ return rc;
+ }
+ *r_list = list;
+ return 0;
+}
+
+
+
+static gpg_error_t
+istrusted_status_cb (void *opaque, const char *line)
+{
+ struct rootca_flags_s *flags = opaque;
+ const char *s;
+
+ if ((s = has_leading_keyword (line, "TRUSTLISTFLAG")))
+ {
+ line = s;
+ if (has_leading_keyword (line, "relax"))
+ flags->relax = 1;
+ else if (has_leading_keyword (line, "cm"))
+ flags->chain_model = 1;
+ }
+ return 0;
+}
+
+
+
+/* Ask the agent whether the certificate is in the list of trusted
+ keys. The certificate is either specified by the CERT object or by
+ the fingerprint HEXFPR. ROOTCA_FLAGS is guaranteed to be cleared
+ on error. */
+int
+gpgsm_agent_istrusted (ctrl_t ctrl, ksba_cert_t cert, const char *hexfpr,
+ struct rootca_flags_s *rootca_flags)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+
+ memset (rootca_flags, 0, sizeof *rootca_flags);
+
+ if (cert && hexfpr)
+ return gpg_error (GPG_ERR_INV_ARG);
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+
+ if (hexfpr)
+ {
+ snprintf (line, DIM(line), "ISTRUSTED %s", hexfpr);
+ }
+ else
+ {
+ char *fpr;
+
+ fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+ if (!fpr)
+ {
+ log_error ("error getting the fingerprint\n");
+ return gpg_error (GPG_ERR_GENERAL);
+ }
+
+ snprintf (line, DIM(line), "ISTRUSTED %s", fpr);
+ xfree (fpr);
+ }
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
+ istrusted_status_cb, rootca_flags);
+ if (!rc)
+ rootca_flags->valid = 1;
+ return rc;
+}
+
+/* Ask the agent to mark CERT as a trusted Root-CA one */
+int
+gpgsm_agent_marktrusted (ctrl_t ctrl, ksba_cert_t cert)
+{
+ int rc;
+ char *fpr, *dn, *dnfmt;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+ if (!fpr)
+ {
+ log_error ("error getting the fingerprint\n");
+ return gpg_error (GPG_ERR_GENERAL);
+ }
+
+ dn = ksba_cert_get_issuer (cert, 0);
+ if (!dn)
+ {
+ xfree (fpr);
+ return gpg_error (GPG_ERR_GENERAL);
+ }
+ dnfmt = gpgsm_format_name2 (dn, 0);
+ xfree (dn);
+ if (!dnfmt)
+ return gpg_error_from_syserror ();
+ snprintf (line, DIM(line), "MARKTRUSTED %s S %s", fpr, dnfmt);
+ ksba_free (dnfmt);
+ xfree (fpr);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ return rc;
+}
+
+
+
+/* Ask the agent whether the a corresponding secret key is available
+ for the given keygrip */
+int
+gpgsm_agent_havekey (ctrl_t ctrl, const char *hexkeygrip)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+
+ if (!hexkeygrip || strlen (hexkeygrip) != 40)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ snprintf (line, DIM(line), "HAVEKEY %s", hexkeygrip);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ return rc;
+}
+
+
+static gpg_error_t
+learn_status_cb (void *opaque, const char *line)
+{
+ struct learn_parm_s *parm = opaque;
+ const char *s;
+
+ /* Pass progress data to the caller. */
+ if ((s = has_leading_keyword (line, "PROGRESS")))
+ {
+ line = s;
+ if (parm->ctrl)
+ {
+ if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
+ return gpg_error (GPG_ERR_ASS_CANCELED);
+ }
+ }
+ return 0;
+}
+
+static gpg_error_t
+learn_cb (void *opaque, const void *buffer, size_t length)
+{
+ struct learn_parm_s *parm = opaque;
+ size_t len;
+ char *buf;
+ ksba_cert_t cert;
+ int rc;
+ char *string, *p, *pend;
+ strlist_t sl;
+
+ if (parm->error)
+ return 0;
+
+ if (buffer)
+ {
+ put_membuf (parm->data, buffer, length);
+ return 0;
+ }
+ /* END encountered - process what we have */
+ buf = get_membuf (parm->data, &len);
+ if (!buf)
+ {
+ parm->error = gpg_error (GPG_ERR_ENOMEM);
+ return 0;
+ }
+
+ if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, "learncard C 0 0"))
+ return gpg_error (GPG_ERR_ASS_CANCELED);
+
+ /* FIXME: this should go into import.c */
+ rc = ksba_cert_new (&cert);
+ if (rc)
+ {
+ parm->error = rc;
+ return 0;
+ }
+ rc = ksba_cert_init_from_mem (cert, buf, len);
+ if (rc)
+ {
+ log_error ("failed to parse a certificate: %s\n", gpg_strerror (rc));
+ ksba_cert_release (cert);
+ parm->error = rc;
+ return 0;
+ }
+
+ /* Ignore certificates matching certain extended usage flags. */
+ rc = ksba_cert_get_ext_key_usages (cert, &string);
+ if (!rc)
+ {
+ p = string;
+ while (p && (pend=strchr (p, ':')))
+ {
+ *pend++ = 0;
+ for (sl=opt.ignore_cert_with_oid;
+ sl && strcmp (sl->d, p); sl = sl->next)
+ ;
+ if (sl)
+ {
+ if (opt.verbose)
+ log_info ("certificate ignored due to OID %s\n", sl->d);
+ goto leave;
+ }
+ p = pend;
+ if ((p = strchr (p, '\n')))
+ p++;
+ }
+ }
+ else if (gpg_err_code (rc) != GPG_ERR_NO_DATA)
+ log_error (_("error getting key usage information: %s\n"),
+ gpg_strerror (rc));
+ xfree (string);
+ string = NULL;
+
+
+ /* We do not store a certifciate with missing issuers as ephemeral
+ because we can assume that the --learn-card command has been used
+ on purpose. */
+ rc = gpgsm_basic_cert_check (parm->ctrl, cert);
+ if (rc && gpg_err_code (rc) != GPG_ERR_MISSING_CERT
+ && gpg_err_code (rc) != GPG_ERR_MISSING_ISSUER_CERT)
+ log_error ("invalid certificate: %s\n", gpg_strerror (rc));
+ else
+ {
+ int existed;
+
+ if (!keydb_store_cert (parm->ctrl, cert, 0, &existed))
+ {
+ if (opt.verbose > 1 && existed)
+ log_info ("certificate already in DB\n");
+ else if (opt.verbose && !existed)
+ log_info ("certificate imported\n");
+ }
+ }
+
+ leave:
+ xfree (string);
+ string = NULL;
+ ksba_cert_release (cert);
+ init_membuf (parm->data, 4096);
+ return 0;
+}
+
+/* Call the agent to learn about a smartcard */
+int
+gpgsm_agent_learn (ctrl_t ctrl)
+{
+ int rc;
+ struct learn_parm_s learn_parm;
+ membuf_t data;
+ size_t len;
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+
+ rc = warn_version_mismatch (ctrl, agent_ctx, SCDAEMON_NAME, 2);
+ if (rc)
+ return rc;
+
+ init_membuf (&data, 4096);
+ learn_parm.error = 0;
+ learn_parm.ctrl = ctrl;
+ learn_parm.ctx = agent_ctx;
+ learn_parm.data = &data;
+ rc = assuan_transact (agent_ctx, "LEARN --send",
+ learn_cb, &learn_parm,
+ NULL, NULL,
+ learn_status_cb, &learn_parm);
+ xfree (get_membuf (&data, &len));
+ if (rc)
+ return rc;
+ return learn_parm.error;
+}
+
+
+/* Ask the agent to change the passphrase of the key identified by
+ HEXKEYGRIP. If DESC is not NULL, display instead of the default
+ description message. */
+int
+gpgsm_agent_passwd (ctrl_t ctrl, const char *hexkeygrip, const char *desc)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ if (!hexkeygrip || strlen (hexkeygrip) != 40)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ if (desc)
+ {
+ snprintf (line, DIM(line), "SETKEYDESC %s", desc);
+ rc = assuan_transact (agent_ctx, line,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return rc;
+ }
+
+ snprintf (line, DIM(line), "PASSWD %s", hexkeygrip);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ return rc;
+}
+
+
+
+/* Ask the agent to pop up a confirmation dialog with the text DESC
+ and an okay and cancel button. */
+gpg_error_t
+gpgsm_agent_get_confirmation (ctrl_t ctrl, const char *desc)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ rc = start_agent (ctrl);
+ if (rc)
+ return rc;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ snprintf (line, DIM(line), "GET_CONFIRMATION %s", desc);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ return rc;
+}
+
+
+
+/* Return 0 if the agent is alive. This is useful to make sure that
+ an agent has been started. */
+gpg_error_t
+gpgsm_agent_send_nop (ctrl_t ctrl)
+{
+ int rc;
+
+ rc = start_agent (ctrl);
+ if (!rc)
+ rc = assuan_transact (agent_ctx, "NOP",
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ return rc;
+}
+
+
+
+static gpg_error_t
+keyinfo_status_cb (void *opaque, const char *line)
+{
+ char **serialno = opaque;
+ const char *s, *s2;
+
+ if ((s = has_leading_keyword (line, "KEYINFO")) && !*serialno)
+ {
+ s = strchr (s, ' ');
+ if (s && s[1] == 'T' && s[2] == ' ' && s[3])
+ {
+ s += 3;
+ s2 = strchr (s, ' ');
+ if ( s2 > s )
+ {
+ *serialno = xtrymalloc ((s2 - s)+1);
+ if (*serialno)
+ {
+ memcpy (*serialno, s, s2 - s);
+ (*serialno)[s2 - s] = 0;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/* Return the serial number for a secret key. If the returned serial
+ number is NULL, the key is not stored on a smartcard. Caller needs
+ to free R_SERIALNO. */
+gpg_error_t
+gpgsm_agent_keyinfo (ctrl_t ctrl, const char *hexkeygrip, char **r_serialno)
+{
+ gpg_error_t err;
+ char line[ASSUAN_LINELENGTH];
+ char *serialno = NULL;
+
+ *r_serialno = NULL;
+
+ err = start_agent (ctrl);
+ if (err)
+ return err;
+
+ if (!hexkeygrip || strlen (hexkeygrip) != 40)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ snprintf (line, DIM(line), "KEYINFO %s", hexkeygrip);
+
+ err = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
+ keyinfo_status_cb, &serialno);
+ if (!err && serialno)
+ {
+ /* Sanity check for bad characters. */
+ if (strpbrk (serialno, ":\n\r"))
+ err = GPG_ERR_INV_VALUE;
+ }
+ if (err)
+ xfree (serialno);
+ else
+ *r_serialno = serialno;
+ return err;
+}
+
+
+
+/* Ask for the passphrase (this is used for pkcs#12 import/export. On
+ success the caller needs to free the string stored at R_PASSPHRASE.
+ On error NULL will be stored at R_PASSPHRASE and an appropriate
+ error code returned. If REPEAT is true the agent tries to get a
+ new passphrase (i.e. asks the user to confirm it). */
+gpg_error_t
+gpgsm_agent_ask_passphrase (ctrl_t ctrl, const char *desc_msg, int repeat,
+ char **r_passphrase)
+{
+ gpg_error_t err;
+ char line[ASSUAN_LINELENGTH];
+ char *arg4 = NULL;
+ membuf_t data;
+ struct default_inq_parm_s inq_parm;
+
+ *r_passphrase = NULL;
+
+ err = start_agent (ctrl);
+ if (err)
+ return err;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ if (desc_msg && *desc_msg && !(arg4 = percent_plus_escape (desc_msg)))
+ return gpg_error_from_syserror ();
+
+ snprintf (line, DIM(line), "GET_PASSPHRASE --data%s -- X X X %s",
+ repeat? " --repeat=1 --check":"",
+ arg4);
+ xfree (arg4);
+
+ init_membuf_secure (&data, 64);
+ err = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data,
+ default_inq_cb, &inq_parm, NULL, NULL);
+
+ if (err)
+ xfree (get_membuf (&data, NULL));
+ else
+ {
+ put_membuf (&data, "", 1);
+ *r_passphrase = get_membuf (&data, NULL);
+ if (!*r_passphrase)
+ err = gpg_error_from_syserror ();
+ }
+ return err;
+}
+
+
+
+/* Retrieve a key encryption key from the agent. With FOREXPORT true
+ the key shall be use for export, with false for import. On success
+ the new key is stored at R_KEY and its length at R_KEKLEN. */
+gpg_error_t
+gpgsm_agent_keywrap_key (ctrl_t ctrl, int forexport,
+ void **r_kek, size_t *r_keklen)
+{
+ gpg_error_t err;
+ membuf_t data;
+ size_t len;
+ unsigned char *buf;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ *r_kek = NULL;
+ err = start_agent (ctrl);
+ if (err)
+ return err;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ snprintf (line, DIM(line), "KEYWRAP_KEY %s",
+ forexport? "--export":"--import");
+
+ init_membuf_secure (&data, 64);
+ err = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ if (err)
+ {
+ xfree (get_membuf (&data, &len));
+ return err;
+ }
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error_from_syserror ();
+ *r_kek = buf;
+ *r_keklen = len;
+ return 0;
+}
+
+
+
+
+/* Handle the inquiry for an IMPORT_KEY command. */
+static gpg_error_t
+inq_import_key_parms (void *opaque, const char *line)
+{
+ struct import_key_parm_s *parm = opaque;
+ gpg_error_t err;
+
+ if (has_leading_keyword (line, "KEYDATA"))
+ {
+ assuan_begin_confidential (parm->ctx);
+ err = assuan_send_data (parm->ctx, parm->key, parm->keylen);
+ assuan_end_confidential (parm->ctx);
+ }
+ else
+ {
+ struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
+ err = default_inq_cb (&inq_parm, line);
+ }
+
+ return err;
+}
+
+
+/* Call the agent to import a key into the agent. */
+gpg_error_t
+gpgsm_agent_import_key (ctrl_t ctrl, const void *key, size_t keylen)
+{
+ gpg_error_t err;
+ struct import_key_parm_s parm;
+ gnupg_isotime_t timebuf;
+ char line[ASSUAN_LINELENGTH];
+
+ err = start_agent (ctrl);
+ if (err)
+ return err;
+
+ parm.ctrl = ctrl;
+ parm.ctx = agent_ctx;
+ parm.key = key;
+ parm.keylen = keylen;
+
+ gnupg_get_isotime (timebuf);
+ snprintf (line, sizeof line, "IMPORT_KEY --timestamp=%s", timebuf);
+ err = assuan_transact (agent_ctx, line,
+ NULL, NULL, inq_import_key_parms, &parm, NULL, NULL);
+ return err;
+}
+
+
+
+/* Receive a secret key from the agent. KEYGRIP is the hexified
+ keygrip, DESC a prompt to be displayed with the agent's passphrase
+ question (needs to be plus+percent escaped). On success the key is
+ stored as a canonical S-expression at R_RESULT and R_RESULTLEN. */
+gpg_error_t
+gpgsm_agent_export_key (ctrl_t ctrl, const char *keygrip, const char *desc,
+ unsigned char **r_result, size_t *r_resultlen)
+{
+ gpg_error_t err;
+ membuf_t data;
+ size_t len;
+ unsigned char *buf;
+ char line[ASSUAN_LINELENGTH];
+ struct default_inq_parm_s inq_parm;
+
+ *r_result = NULL;
+
+ err = start_agent (ctrl);
+ if (err)
+ return err;
+ inq_parm.ctrl = ctrl;
+ inq_parm.ctx = agent_ctx;
+
+ if (desc)
+ {
+ snprintf (line, DIM(line), "SETKEYDESC %s", desc);
+ err = assuan_transact (agent_ctx, line,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (err)
+ return err;
+ }
+
+ snprintf (line, DIM(line), "EXPORT_KEY %s", keygrip);
+
+ init_membuf_secure (&data, 1024);
+ err = assuan_transact (agent_ctx, line,
+ put_membuf_cb, &data,
+ default_inq_cb, &inq_parm, NULL, NULL);
+ if (err)
+ {
+ xfree (get_membuf (&data, &len));
+ return err;
+ }
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error_from_syserror ();
+ *r_result = buf;
+ *r_resultlen = len;
+ return 0;
+}