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-rw-r--r--sm/call-agent.c713
1 files changed, 713 insertions, 0 deletions
diff --git a/sm/call-agent.c b/sm/call-agent.c
new file mode 100644
index 000000000..4d26e3450
--- /dev/null
+++ b/sm/call-agent.c
@@ -0,0 +1,713 @@
+/* call-agent.c - divert operations to the agent
+ * Copyright (C) 2001, 2002, 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 <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 "i18n.h"
+#include "keydb.h" /* fixme: Move this to import.c */
+#include "../common/membuf.h"
+
+
+static ASSUAN_CONTEXT agent_ctx = NULL;
+static int force_pipe_server = 0;
+
+struct cipher_parm_s {
+ ASSUAN_CONTEXT ctx;
+ const char *ciphertext;
+ size_t ciphertextlen;
+};
+
+struct genkey_parm_s {
+ ASSUAN_CONTEXT ctx;
+ const char *sexp;
+ size_t sexplen;
+};
+
+struct learn_parm_s {
+ int error;
+ ASSUAN_CONTEXT ctx;
+ membuf_t *data;
+};
+
+
+
+/* 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 (void)
+{
+ int rc = 0;
+ char *infostr, *p;
+ ASSUAN_CONTEXT ctx;
+ char *dft_display = NULL;
+ char *dft_ttyname = NULL;
+ char *dft_ttytype = NULL;
+ char *old_lc = NULL;
+ char *dft_lc = NULL;
+
+ if (agent_ctx)
+ return 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 */
+
+ infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
+ if (!infostr)
+ {
+ const char *pgmname;
+ const char *argv[3];
+ int no_close_list[3];
+ int i;
+
+ if (opt.verbose)
+ log_info (_("no running gpg-agent - starting one\n"));
+
+ if (fflush (NULL))
+ {
+ gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
+ log_error ("error flushing pending output: %s\n", strerror (errno));
+ return tmperr;
+ }
+
+ if (!opt.agent_program || !*opt.agent_program)
+ opt.agent_program = GNUPG_DEFAULT_AGENT;
+ if ( !(pgmname = strrchr (opt.agent_program, '/')))
+ pgmname = opt.agent_program;
+ else
+ pgmname++;
+
+ argv[0] = pgmname;
+ argv[1] = "--server";
+ argv[2] = NULL;
+
+ i=0;
+ if (log_get_fd () != -1)
+ no_close_list[i++] = log_get_fd ();
+ no_close_list[i++] = fileno (stderr);
+ no_close_list[i] = -1;
+
+ /* connect to the agent and perform initial handshaking */
+ rc = assuan_pipe_connect (&ctx, opt.agent_program, (char**)argv,
+ no_close_list);
+ }
+ else
+ {
+ int prot;
+ int pid;
+
+ infostr = xstrdup (infostr);
+ if ( !(p = strchr (infostr, ':')) || p == infostr)
+ {
+ log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
+ xfree (infostr);
+ force_pipe_server = 1;
+ return start_agent ();
+ }
+ *p++ = 0;
+ pid = atoi (p);
+ while (*p && *p != ':')
+ p++;
+ prot = *p? atoi (p+1) : 0;
+ if (prot != 1)
+ {
+ log_error (_("gpg-agent protocol version %d is not supported\n"),
+ prot);
+ xfree (infostr);
+ force_pipe_server = 1;
+ return start_agent ();
+ }
+
+ rc = assuan_socket_connect (&ctx, infostr, pid);
+ xfree (infostr);
+ if (rc == ASSUAN_Connect_Failed)
+ {
+ log_error (_("can't connect to the agent - trying fall back\n"));
+ force_pipe_server = 1;
+ return start_agent ();
+ }
+ }
+
+ if (rc)
+ {
+ log_error ("can't connect to the agent: %s\n", assuan_strerror (rc));
+ return gpg_error (GPG_ERR_NO_AGENT);
+ }
+ agent_ctx = ctx;
+
+ if (DBG_ASSUAN)
+ log_debug ("connection to agent established\n");
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return map_assuan_err (rc);
+
+ dft_display = getenv ("DISPLAY");
+ if (opt.display || dft_display)
+ {
+ char *optstr;
+ if (asprintf (&optstr, "OPTION display=%s",
+ opt.display ? opt.display : dft_display) < 0)
+ return OUT_OF_CORE (errno);
+ rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
+ NULL);
+ free (optstr);
+ if (rc)
+ return map_assuan_err (rc);
+ }
+ if (!opt.ttyname)
+ {
+ dft_ttyname = getenv ("GPG_TTY");
+ if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
+ dft_ttyname = ttyname (0);
+ }
+ if (opt.ttyname || dft_ttyname)
+ {
+ char *optstr;
+ if (asprintf (&optstr, "OPTION ttyname=%s",
+ opt.ttyname ? opt.ttyname : dft_ttyname) < 0)
+ return OUT_OF_CORE (errno);
+ rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
+ NULL);
+ free (optstr);
+ if (rc)
+ return map_assuan_err (rc);
+ }
+ dft_ttytype = getenv ("TERM");
+ if (opt.ttytype || (dft_ttyname && dft_ttytype))
+ {
+ char *optstr;
+ if (asprintf (&optstr, "OPTION ttytype=%s",
+ opt.ttyname ? opt.ttytype : dft_ttytype) < 0)
+ return OUT_OF_CORE (errno);
+ rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
+ NULL);
+ free (optstr);
+ if (rc)
+ return map_assuan_err (rc);
+ }
+#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
+ old_lc = setlocale (LC_CTYPE, NULL);
+ if (old_lc)
+ {
+ old_lc = strdup (old_lc);
+ if (!old_lc)
+ return OUT_OF_CORE (errno);
+ }
+ dft_lc = setlocale (LC_CTYPE, "");
+#endif
+ if (opt.lc_ctype || (dft_ttyname && dft_lc))
+ {
+ char *optstr;
+ if (asprintf (&optstr, "OPTION lc-ctype=%s",
+ opt.lc_ctype ? opt.lc_ctype : dft_lc) < 0)
+ rc = OUT_OF_CORE (errno);
+ else
+ {
+ rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
+ NULL);
+ free (optstr);
+ if (rc)
+ rc = map_assuan_err (rc);
+ }
+ }
+#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
+ if (old_lc)
+ {
+ setlocale (LC_CTYPE, old_lc);
+ free (old_lc);
+ }
+#endif
+ if (rc)
+ return rc;
+#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
+ old_lc = setlocale (LC_MESSAGES, NULL);
+ if (old_lc)
+ {
+ old_lc = strdup (old_lc);
+ if (!old_lc)
+ return OUT_OF_CORE (errno);
+ }
+ dft_lc = setlocale (LC_MESSAGES, "");
+#endif
+ if (opt.lc_messages || (dft_ttyname && dft_lc))
+ {
+ char *optstr;
+ if (asprintf (&optstr, "OPTION lc-messages=%s",
+ opt.lc_messages ? opt.lc_messages : dft_lc) < 0)
+ rc = OUT_OF_CORE (errno);
+ else
+ {
+ rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
+ NULL);
+ free (optstr);
+ if (rc)
+ rc = map_assuan_err (rc);
+ }
+ }
+#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
+ if (old_lc)
+ {
+ setlocale (LC_MESSAGES, old_lc);
+ free (old_lc);
+ }
+#endif
+
+ return rc;
+}
+
+
+static AssuanError
+membuf_data_cb (void *opaque, const void *buffer, size_t length)
+{
+ membuf_t *data = opaque;
+
+ if (buffer)
+ put_membuf (data, buffer, length);
+ return 0;
+}
+
+
+
+
+/* Call the agent to do a sign operation using the key identified by
+ the hex string KEYGRIP. */
+int
+gpgsm_agent_pksign (const char *keygrip,
+ unsigned char *digest, size_t digestlen, int digestalgo,
+ char **r_buf, size_t *r_buflen )
+{
+ int rc, i;
+ char *p, line[ASSUAN_LINELENGTH];
+ membuf_t data;
+ size_t len;
+
+ *r_buf = NULL;
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ 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 map_assuan_err (rc);
+
+ snprintf (line, DIM(line)-1, "SIGKEY %s", keygrip);
+ line[DIM(line)-1] = 0;
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return map_assuan_err (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 map_assuan_err (rc);
+
+ init_membuf (&data, 1024);
+ rc = assuan_transact (agent_ctx, "PKSIGN",
+ membuf_data_cb, &data, NULL, NULL, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return map_assuan_err (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 (errno);
+}
+
+
+
+
+/* Handle a CIPHERTEXT inquiry. Note, we only send the data,
+ assuan_transact talkes care of flushing and writing the end */
+static AssuanError
+inq_ciphertext_cb (void *opaque, const char *keyword)
+{
+ struct cipher_parm_s *parm = opaque;
+ AssuanError rc;
+
+ assuan_begin_confidential (parm->ctx);
+ rc = assuan_send_data (parm->ctx, parm->ciphertext, parm->ciphertextlen);
+ assuan_end_confidential (parm->ctx);
+ return rc;
+}
+
+
+/* Call the agent to do a decrypt operation using the key identified by
+ the hex string KEYGRIP. */
+int
+gpgsm_agent_pkdecrypt (const char *keygrip,
+ KsbaConstSexp 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 *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 ();
+ if (rc)
+ return rc;
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return map_assuan_err (rc);
+
+ assert ( DIM(line) >= 50 );
+ snprintf (line, DIM(line)-1, "SETKEY %s", keygrip);
+ line[DIM(line)-1] = 0;
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return map_assuan_err (rc);
+
+ init_membuf (&data, 1024);
+ cipher_parm.ctx = agent_ctx;
+ cipher_parm.ciphertext = ciphertext;
+ cipher_parm.ciphertextlen = ciphertextlen;
+ rc = assuan_transact (agent_ctx, "PKDECRYPT",
+ membuf_data_cb, &data,
+ inq_ciphertext_cb, &cipher_parm, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return map_assuan_err (rc);
+ }
+
+ put_membuf (&data, "", 1); /* make sure it is 0 terminated */
+ buf = get_membuf (&data, &len);
+ if (!buf)
+ return gpg_error (GPG_ERR_ENOMEM);
+ /* FIXME: We would better a return a full S-exp and not just a part */
+ assert (len);
+ len--; /* remove the terminating 0 */
+ n = strtoul (buf, &endp, 10);
+ if (!n || *endp != ':')
+ return gpg_error (GPG_ERR_INV_SEXP);
+ endp++;
+ if (endp-buf+n > len)
+ return gpg_error (GPG_ERR_INV_SEXP); /* oops len does not
+ match internal len*/
+ 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 AssuanError
+inq_genkey_parms (void *opaque, const char *keyword)
+{
+ struct genkey_parm_s *parm = opaque;
+ AssuanError rc;
+
+ rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
+ return rc;
+}
+
+
+
+/* Call the agent to generate a newkey */
+int
+gpgsm_agent_genkey (KsbaConstSexp keyparms, KsbaSexp *r_pubkey)
+{
+ int rc;
+ struct genkey_parm_s gk_parm;
+ membuf_t data;
+ size_t len;
+ char *buf;
+
+ *r_pubkey = NULL;
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
+ if (rc)
+ return map_assuan_err (rc);
+
+ init_membuf (&data, 1024);
+ 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);
+ rc = assuan_transact (agent_ctx, "GENKEY",
+ membuf_data_cb, &data,
+ inq_genkey_parms, &gk_parm, NULL, NULL);
+ if (rc)
+ {
+ xfree (get_membuf (&data, &len));
+ return map_assuan_err (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;
+}
+
+
+/* Ask the agent whether the certificate is in the list of trusted
+ keys */
+int
+gpgsm_agent_istrusted (KsbaCert cert)
+{
+ int rc;
+ char *fpr;
+ char line[ASSUAN_LINELENGTH];
+
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ 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)-1, "ISTRUSTED %s", fpr);
+ line[DIM(line)-1] = 0;
+ xfree (fpr);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ return map_assuan_err (rc);
+}
+
+/* Ask the agent to mark CERT as a trusted Root-CA one */
+int
+gpgsm_agent_marktrusted (KsbaCert cert)
+{
+ int rc;
+ char *fpr, *dn;
+ char line[ASSUAN_LINELENGTH];
+
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ 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);
+ }
+ snprintf (line, DIM(line)-1, "MARKTRUSTED %s S %s", fpr, dn);
+ line[DIM(line)-1] = 0;
+ ksba_free (dn);
+ xfree (fpr);
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ return map_assuan_err (rc);
+}
+
+
+
+/* Ask the agent whether the a corresponding secret key is available
+ for the given keygrip */
+int
+gpgsm_agent_havekey (const char *hexkeygrip)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ if (!hexkeygrip || strlen (hexkeygrip) != 40)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ snprintf (line, DIM(line)-1, "HAVEKEY %s", hexkeygrip);
+ line[DIM(line)-1] = 0;
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ return map_assuan_err (rc);
+}
+
+
+static AssuanError
+learn_cb (void *opaque, const void *buffer, size_t length)
+{
+ struct learn_parm_s *parm = opaque;
+ size_t len;
+ char *buf;
+ KsbaCert cert;
+ int rc;
+
+ 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;
+ }
+
+
+ /* FIXME: this should go into import.c */
+ cert = ksba_cert_new ();
+ if (!cert)
+ {
+ parm->error = gpg_error (GPG_ERR_ENOMEM);
+ return 0;
+ }
+ rc = ksba_cert_init_from_mem (cert, buf, len);
+ if (rc)
+ {
+ log_error ("failed to parse a certificate: %s\n", ksba_strerror (rc));
+ ksba_cert_release (cert);
+ parm->error = map_ksba_err (rc);
+ return 0;
+ }
+
+ rc = gpgsm_basic_cert_check (cert);
+ if (gpg_err_code (rc) == GPG_ERR_MISSING_CERT)
+ { /* For later use we store it in the ephemeral database. */
+ log_info ("issuer certificate missing - storing as ephemeral\n");
+ keydb_store_cert (cert, 1, NULL);
+ }
+ else if (rc)
+ log_error ("invalid certificate: %s\n", gpg_strerror (rc));
+ else
+ {
+ int existed;
+
+ if (!keydb_store_cert (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");
+ }
+ }
+
+ ksba_cert_release (cert);
+ init_membuf (parm->data, 4096);
+ return 0;
+}
+
+/* Call the agent to learn about a smartcard */
+int
+gpgsm_agent_learn ()
+{
+ int rc;
+ struct learn_parm_s learn_parm;
+ membuf_t data;
+ size_t len;
+
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ init_membuf (&data, 4096);
+ learn_parm.error = 0;
+ learn_parm.ctx = agent_ctx;
+ learn_parm.data = &data;
+ rc = assuan_transact (agent_ctx, "LEARN --send",
+ learn_cb, &learn_parm,
+ NULL, NULL, NULL, NULL);
+ xfree (get_membuf (&data, &len));
+ if (rc)
+ return map_assuan_err (rc);
+ return learn_parm.error;
+}
+
+
+/* Ask the agent to change the passphrase of the key identified by HEXKEYGRIP. */
+int
+gpgsm_agent_passwd (const char *hexkeygrip)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+
+ rc = start_agent ();
+ if (rc)
+ return rc;
+
+ if (!hexkeygrip || strlen (hexkeygrip) != 40)
+ return gpg_error (GPG_ERR_INV_VALUE);
+
+ snprintf (line, DIM(line)-1, "PASSWD %s", hexkeygrip);
+ line[DIM(line)-1] = 0;
+
+ rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ return map_assuan_err (rc);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 08:42:00 +0100