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-rw-r--r--sm/call-dirmngr.c1099
1 files changed, 1099 insertions, 0 deletions
diff --git a/sm/call-dirmngr.c b/sm/call-dirmngr.c
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+++ b/sm/call-dirmngr.c
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+/* call-dirmngr.c - Communication with the dirmngr
+ * Copyright (C) 2002, 2003, 2005, 2007, 2008,
+ * 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>
+#include <ctype.h>
+
+#include "gpgsm.h"
+#include <gcrypt.h>
+#include <assuan.h>
+
+#include "../common/i18n.h"
+#include "keydb.h"
+#include "../common/asshelp.h"
+
+
+struct membuf {
+ size_t len;
+ size_t size;
+ char *buf;
+ int out_of_core;
+};
+
+
+
+/* fixme: We need a context for each thread or serialize the access to
+ the dirmngr. */
+static assuan_context_t dirmngr_ctx = NULL;
+static assuan_context_t dirmngr2_ctx = NULL;
+
+static int dirmngr_ctx_locked;
+static int dirmngr2_ctx_locked;
+
+struct inq_certificate_parm_s {
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ ksba_cert_t cert;
+ ksba_cert_t issuer_cert;
+};
+
+struct isvalid_status_parm_s {
+ ctrl_t ctrl;
+ int seen;
+ unsigned char fpr[20];
+};
+
+
+struct lookup_parm_s {
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+ void (*cb)(void *, ksba_cert_t);
+ void *cb_value;
+ struct membuf data;
+ int error;
+};
+
+struct run_command_parm_s {
+ ctrl_t ctrl;
+ assuan_context_t ctx;
+};
+
+
+
+static gpg_error_t get_cached_cert (assuan_context_t ctx,
+ const unsigned char *fpr,
+ ksba_cert_t *r_cert);
+
+
+
+/* A simple implementation of a dynamic buffer. Use init_membuf() to
+ create a buffer, put_membuf to append bytes and get_membuf to
+ release and return the buffer. Allocation errors are detected but
+ only returned at the final get_membuf(), this helps not to clutter
+ the code with out of core checks. */
+
+static void
+init_membuf (struct membuf *mb, int initiallen)
+{
+ mb->len = 0;
+ mb->size = initiallen;
+ mb->out_of_core = 0;
+ mb->buf = xtrymalloc (initiallen);
+ if (!mb->buf)
+ mb->out_of_core = 1;
+}
+
+static void
+put_membuf (struct membuf *mb, const void *buf, size_t len)
+{
+ if (mb->out_of_core)
+ return;
+
+ if (mb->len + len >= mb->size)
+ {
+ char *p;
+
+ mb->size += len + 1024;
+ p = xtryrealloc (mb->buf, mb->size);
+ if (!p)
+ {
+ mb->out_of_core = 1;
+ return;
+ }
+ mb->buf = p;
+ }
+ memcpy (mb->buf + mb->len, buf, len);
+ mb->len += len;
+}
+
+static void *
+get_membuf (struct membuf *mb, size_t *len)
+{
+ char *p;
+
+ if (mb->out_of_core)
+ {
+ xfree (mb->buf);
+ mb->buf = NULL;
+ return NULL;
+ }
+
+ p = mb->buf;
+ *len = mb->len;
+ mb->buf = NULL;
+ mb->out_of_core = 1; /* don't allow a reuse */
+ return p;
+}
+
+
+/* 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;
+}
+
+
+/* This function prepares the dirmngr for a new session. The
+ audit-events option is used so that other dirmngr clients won't get
+ disturbed by such events. */
+static void
+prepare_dirmngr (ctrl_t ctrl, assuan_context_t ctx, gpg_error_t err)
+{
+ strlist_t server;
+
+ if (!err)
+ err = warn_version_mismatch (ctrl, ctx, DIRMNGR_NAME, 0);
+
+ if (!err)
+ {
+ err = assuan_transact (ctx, "OPTION audit-events=1",
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
+ err = 0; /* Allow the use of old dirmngr versions. */
+ }
+ audit_log_ok (ctrl->audit, AUDIT_DIRMNGR_READY, err);
+
+ if (!ctx || err)
+ return;
+
+ server = opt.keyserver;
+ while (server)
+ {
+ char line[ASSUAN_LINELENGTH];
+
+ /* If the host is "ldap" we prefix the entire line with "ldap:"
+ * to avoid an ambiguity on the server due to the introduction
+ * of this optional prefix. */
+ snprintf (line, DIM (line), "LDAPSERVER %s%s",
+ !strncmp (server->d, "ldap:", 5)? "ldap:":"",
+ server->d);
+
+ assuan_transact (ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+ /* The code below is not required because we don't return an error. */
+ /* err = [above call] */
+ /* if (gpg_err_code (err) == GPG_ERR_ASS_UNKNOWN_CMD) */
+ /* err = 0; /\* Allow the use of old dirmngr versions. *\/ */
+
+ server = server->next;
+ }
+}
+
+
+
+/* Return a new assuan context for a Dirmngr connection. */
+static gpg_error_t
+start_dirmngr_ext (ctrl_t ctrl, assuan_context_t *ctx_r)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+
+ if (opt.disable_dirmngr || ctrl->offline)
+ return gpg_error (GPG_ERR_NO_DIRMNGR);
+
+ if (*ctx_r)
+ return 0;
+
+ /* Note: if you change this to multiple connections, you also need
+ to take care of the implicit option sending caching. */
+
+ err = start_new_dirmngr (&ctx, GPG_ERR_SOURCE_DEFAULT,
+ opt.dirmngr_program,
+ opt.autostart, opt.verbose, DBG_IPC,
+ gpgsm_status2, ctrl);
+ if (!opt.autostart && gpg_err_code (err) == GPG_ERR_NO_DIRMNGR)
+ {
+ static int shown;
+
+ if (!shown)
+ {
+ shown = 1;
+ log_info (_("no dirmngr running in this session\n"));
+ }
+ }
+ prepare_dirmngr (ctrl, ctx, err);
+ if (err)
+ return err;
+
+ *ctx_r = ctx;
+ return 0;
+}
+
+
+static int
+start_dirmngr (ctrl_t ctrl)
+{
+ gpg_error_t err;
+
+ assert (! dirmngr_ctx_locked);
+ dirmngr_ctx_locked = 1;
+
+ err = start_dirmngr_ext (ctrl, &dirmngr_ctx);
+ /* We do not check ERR but the existence of a context because the
+ error might come from a failed command send to the dirmngr.
+ Fixme: Why don't we close the drimngr context if we encountered
+ an error in prepare_dirmngr? */
+ if (!dirmngr_ctx)
+ dirmngr_ctx_locked = 0;
+ return err;
+}
+
+
+static void
+release_dirmngr (ctrl_t ctrl)
+{
+ (void)ctrl;
+
+ if (!dirmngr_ctx_locked)
+ log_error ("WARNING: trying to release a non-locked dirmngr ctx\n");
+ dirmngr_ctx_locked = 0;
+}
+
+
+static int
+start_dirmngr2 (ctrl_t ctrl)
+{
+ gpg_error_t err;
+
+ assert (! dirmngr2_ctx_locked);
+ dirmngr2_ctx_locked = 1;
+
+ err = start_dirmngr_ext (ctrl, &dirmngr2_ctx);
+ if (!dirmngr2_ctx)
+ dirmngr2_ctx_locked = 0;
+ return err;
+}
+
+
+static void
+release_dirmngr2 (ctrl_t ctrl)
+{
+ (void)ctrl;
+
+ if (!dirmngr2_ctx_locked)
+ log_error ("WARNING: trying to release a non-locked dirmngr2 ctx\n");
+ dirmngr2_ctx_locked = 0;
+}
+
+
+
+/* Handle a SENDCERT inquiry. */
+static gpg_error_t
+inq_certificate (void *opaque, const char *line)
+{
+ struct inq_certificate_parm_s *parm = opaque;
+ const char *s;
+ int rc;
+ size_t n;
+ const unsigned char *der;
+ size_t derlen;
+ int issuer_mode = 0;
+ ksba_sexp_t ski = NULL;
+
+ if ((s = has_leading_keyword (line, "SENDCERT")))
+ {
+ line = s;
+ }
+ else if ((s = has_leading_keyword (line, "SENDCERT_SKI")))
+ {
+ /* Send a certificate where a sourceKeyIdentifier is included. */
+ line = s;
+ ski = make_simple_sexp_from_hexstr (line, &n);
+ line += n;
+ while (*line == ' ')
+ line++;
+ }
+ else if ((s = has_leading_keyword (line, "SENDISSUERCERT")))
+ {
+ line = s;
+ issuer_mode = 1;
+ }
+ else if ((s = has_leading_keyword (line, "ISTRUSTED")))
+ {
+ /* The server is asking us whether the certificate is a trusted
+ root certificate. */
+ char fpr[41];
+ struct rootca_flags_s rootca_flags;
+
+ line = s;
+
+ for (s=line,n=0; hexdigitp (s); s++, n++)
+ ;
+ if (*s || n != 40)
+ return gpg_error (GPG_ERR_ASS_PARAMETER);
+ for (s=line, n=0; n < 40; s++, n++)
+ fpr[n] = (*s >= 'a')? (*s & 0xdf): *s;
+ fpr[n] = 0;
+
+ if (!gpgsm_agent_istrusted (parm->ctrl, NULL, fpr, &rootca_flags))
+ rc = assuan_send_data (parm->ctx, "1", 1);
+ else
+ rc = 0;
+ return rc;
+ }
+ else
+ {
+ log_error ("unsupported certificate inquiry '%s'\n", line);
+ return gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+ }
+
+ if (!*line)
+ { /* Send the current certificate. */
+ der = ksba_cert_get_image (issuer_mode? parm->issuer_cert : parm->cert,
+ &derlen);
+ if (!der)
+ rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+ else
+ rc = assuan_send_data (parm->ctx, der, derlen);
+ }
+ else if (issuer_mode)
+ {
+ log_error ("sending specific issuer certificate back "
+ "is not yet implemented\n");
+ rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+ }
+ else
+ { /* Send the given certificate. */
+ int err;
+ ksba_cert_t cert;
+
+
+ err = gpgsm_find_cert (parm->ctrl, line, ski, &cert, 1);
+ if (err)
+ {
+ log_error ("certificate not found: %s\n", gpg_strerror (err));
+ rc = gpg_error (GPG_ERR_NOT_FOUND);
+ }
+ else
+ {
+ der = ksba_cert_get_image (cert, &derlen);
+ if (!der)
+ rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+ else
+ rc = assuan_send_data (parm->ctx, der, derlen);
+ ksba_cert_release (cert);
+ }
+ }
+
+ xfree (ski);
+ return rc;
+}
+
+
+/* Take a 20 byte hexencoded string and put it into the provided
+ 20 byte buffer FPR in binary format. */
+static int
+unhexify_fpr (const char *hexstr, unsigned char *fpr)
+{
+ const char *s;
+ int n;
+
+ for (s=hexstr, n=0; hexdigitp (s); s++, n++)
+ ;
+ if (*s || (n != 40))
+ return 0; /* no fingerprint (invalid or wrong length). */
+ for (s=hexstr, n=0; *s; s += 2, n++)
+ fpr[n] = xtoi_2 (s);
+ return 1; /* okay */
+}
+
+
+static gpg_error_t
+isvalid_status_cb (void *opaque, const char *line)
+{
+ struct isvalid_status_parm_s *parm = opaque;
+ const char *s;
+
+ if ((s = has_leading_keyword (line, "PROGRESS")))
+ {
+ if (parm->ctrl)
+ {
+ line = s;
+ if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
+ return gpg_error (GPG_ERR_ASS_CANCELED);
+ }
+ }
+ else if ((s = has_leading_keyword (line, "ONLY_VALID_IF_CERT_VALID")))
+ {
+ parm->seen++;
+ if (!*s || !unhexify_fpr (s, parm->fpr))
+ parm->seen++; /* Bumb it to indicate an error. */
+ }
+ return 0;
+}
+
+
+
+
+/* Call the directory manager to check whether the certificate is valid
+ Returns 0 for valid or usually one of the errors:
+
+ GPG_ERR_CERTIFICATE_REVOKED
+ GPG_ERR_NO_CRL_KNOWN
+ GPG_ERR_CRL_TOO_OLD
+
+ Values for USE_OCSP:
+ 0 = Do CRL check.
+ 1 = Do an OCSP check but fallback to CRL unless CRLS are disabled.
+ 2 = Do only an OCSP check using only the default responder.
+ */
+int
+gpgsm_dirmngr_isvalid (ctrl_t ctrl,
+ ksba_cert_t cert, ksba_cert_t issuer_cert, int use_ocsp)
+{
+ static int did_options;
+ int rc;
+ char *certid, *certfpr;
+ char line[ASSUAN_LINELENGTH];
+ struct inq_certificate_parm_s parm;
+ struct isvalid_status_parm_s stparm;
+
+ keydb_close_all_files ();
+
+ rc = start_dirmngr (ctrl);
+ if (rc)
+ return rc;
+
+ certfpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+ certid = gpgsm_get_certid (cert);
+ if (!certid)
+ {
+ log_error ("error getting the certificate ID\n");
+ release_dirmngr (ctrl);
+ return gpg_error (GPG_ERR_GENERAL);
+ }
+
+ if (opt.verbose > 1)
+ {
+ char *fpr = gpgsm_get_fingerprint_string (cert, GCRY_MD_SHA1);
+ log_info ("asking dirmngr about %s%s\n", fpr,
+ use_ocsp? " (using OCSP)":"");
+ xfree (fpr);
+ }
+
+ parm.ctx = dirmngr_ctx;
+ parm.ctrl = ctrl;
+ parm.cert = cert;
+ parm.issuer_cert = issuer_cert;
+
+ stparm.ctrl = ctrl;
+ stparm.seen = 0;
+ memset (stparm.fpr, 0, 20);
+
+ /* It is sufficient to send the options only once because we have
+ * one connection per process only. */
+ if (!did_options)
+ {
+ if (opt.force_crl_refresh)
+ assuan_transact (dirmngr_ctx, "OPTION force-crl-refresh=1",
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ did_options = 1;
+ }
+ snprintf (line, DIM(line), "ISVALID%s%s %s%s%s",
+ use_ocsp == 2 || opt.no_crl_check ? " --only-ocsp":"",
+ use_ocsp == 2? " --force-default-responder":"",
+ certid,
+ use_ocsp? " ":"",
+ use_ocsp? certfpr:"");
+ xfree (certid);
+ xfree (certfpr);
+
+ rc = assuan_transact (dirmngr_ctx, line, NULL, NULL,
+ inq_certificate, &parm,
+ isvalid_status_cb, &stparm);
+ if (opt.verbose > 1)
+ log_info ("response of dirmngr: %s\n", rc? gpg_strerror (rc): "okay");
+
+ if (!rc && stparm.seen)
+ {
+ /* Need to also check the certificate validity. */
+ if (stparm.seen != 1)
+ {
+ log_error ("communication problem with dirmngr detected\n");
+ rc = gpg_error (GPG_ERR_INV_CRL);
+ }
+ else
+ {
+ ksba_cert_t rspcert = NULL;
+
+ if (get_cached_cert (dirmngr_ctx, stparm.fpr, &rspcert))
+ {
+ /* Ooops: Something went wrong getting the certificate
+ from the dirmngr. Try our own cert store now. */
+ KEYDB_HANDLE kh;
+
+ kh = keydb_new ();
+ if (!kh)
+ rc = gpg_error (GPG_ERR_ENOMEM);
+ if (!rc)
+ rc = keydb_search_fpr (ctrl, kh, stparm.fpr);
+ if (!rc)
+ rc = keydb_get_cert (kh, &rspcert);
+ if (rc)
+ {
+ log_error ("unable to find the certificate used "
+ "by the dirmngr: %s\n", gpg_strerror (rc));
+ rc = gpg_error (GPG_ERR_INV_CRL);
+ }
+ keydb_release (kh);
+ }
+
+ if (!rc)
+ {
+ rc = gpgsm_cert_use_ocsp_p (rspcert);
+ if (rc)
+ rc = gpg_error (GPG_ERR_INV_CRL);
+ else
+ {
+ /* Note the no_dirmngr flag: This avoids checking
+ this certificate over and over again. */
+ rc = gpgsm_validate_chain (ctrl, rspcert, "", NULL, 0, NULL,
+ VALIDATE_FLAG_NO_DIRMNGR, NULL);
+ if (rc)
+ {
+ log_error ("invalid certificate used for CRL/OCSP: %s\n",
+ gpg_strerror (rc));
+ rc = gpg_error (GPG_ERR_INV_CRL);
+ }
+ }
+ }
+ ksba_cert_release (rspcert);
+ }
+ }
+ release_dirmngr (ctrl);
+ return rc;
+}
+
+
+
+/* Lookup helpers*/
+static gpg_error_t
+lookup_cb (void *opaque, const void *buffer, size_t length)
+{
+ struct lookup_parm_s *parm = opaque;
+ size_t len;
+ char *buf;
+ ksba_cert_t 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;
+ }
+
+ 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));
+ }
+ else
+ {
+ parm->cb (parm->cb_value, cert);
+ }
+
+ ksba_cert_release (cert);
+ init_membuf (&parm->data, 4096);
+ return 0;
+}
+
+/* Return a properly escaped pattern from NAMES. The only error
+ return is NULL to indicate a malloc failure. */
+static char *
+pattern_from_strlist (strlist_t names)
+{
+ strlist_t sl;
+ int n;
+ const char *s;
+ char *pattern, *p;
+
+ for (n=0, sl=names; sl; sl = sl->next)
+ {
+ for (s=sl->d; *s; s++, n++)
+ {
+ if (*s == '%' || *s == ' ' || *s == '+')
+ n += 2;
+ }
+ n++;
+ }
+
+ p = pattern = xtrymalloc (n+1);
+ if (!pattern)
+ return NULL;
+
+ for (sl=names; sl; sl = sl->next)
+ {
+ for (s=sl->d; *s; s++)
+ {
+ switch (*s)
+ {
+ case '%':
+ *p++ = '%';
+ *p++ = '2';
+ *p++ = '5';
+ break;
+ case ' ':
+ *p++ = '%';
+ *p++ = '2';
+ *p++ = '0';
+ break;
+ case '+':
+ *p++ = '%';
+ *p++ = '2';
+ *p++ = 'B';
+ break;
+ default:
+ *p++ = *s;
+ break;
+ }
+ }
+ *p++ = ' ';
+ }
+ if (p == pattern)
+ *pattern = 0; /* is empty */
+ else
+ p[-1] = '\0'; /* remove trailing blank */
+
+ return pattern;
+}
+
+static gpg_error_t
+lookup_status_cb (void *opaque, const char *line)
+{
+ struct lookup_parm_s *parm = opaque;
+ const char *s;
+
+ if ((s = has_leading_keyword (line, "PROGRESS")))
+ {
+ if (parm->ctrl)
+ {
+ line = s;
+ if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
+ return gpg_error (GPG_ERR_ASS_CANCELED);
+ }
+ }
+ else if ((s = has_leading_keyword (line, "TRUNCATED")))
+ {
+ if (parm->ctrl)
+ {
+ line = s;
+ gpgsm_status (parm->ctrl, STATUS_TRUNCATED, line);
+ }
+ }
+ return 0;
+}
+
+
+/* Run the Directory Manager's lookup command using the pattern
+ compiled from the strings given in NAMES or from URI. The caller
+ must provide the callback CB which will be passed cert by cert.
+ Note that CTRL is optional. With CACHE_ONLY the dirmngr will
+ search only its own key cache. */
+int
+gpgsm_dirmngr_lookup (ctrl_t ctrl, strlist_t names, const char *uri,
+ int cache_only,
+ void (*cb)(void*, ksba_cert_t), void *cb_value)
+{
+ int rc;
+ char line[ASSUAN_LINELENGTH];
+ struct lookup_parm_s parm;
+ size_t len;
+ assuan_context_t ctx;
+ const char *s;
+
+ if ((names && uri) || (!names && !uri))
+ return gpg_error (GPG_ERR_INV_ARG);
+
+ keydb_close_all_files ();
+
+ /* The lookup function can be invoked from the callback of a lookup
+ function, for example to walk the chain. */
+ if (!dirmngr_ctx_locked)
+ {
+ rc = start_dirmngr (ctrl);
+ if (rc)
+ return rc;
+ ctx = dirmngr_ctx;
+ }
+ else if (!dirmngr2_ctx_locked)
+ {
+ rc = start_dirmngr2 (ctrl);
+ if (rc)
+ return rc;
+ ctx = dirmngr2_ctx;
+ }
+ else
+ {
+ log_fatal ("both dirmngr contexts are in use\n");
+ }
+
+ if (names)
+ {
+ char *pattern = pattern_from_strlist (names);
+ if (!pattern)
+ {
+ if (ctx == dirmngr_ctx)
+ release_dirmngr (ctrl);
+ else
+ release_dirmngr2 (ctrl);
+
+ return out_of_core ();
+ }
+ snprintf (line, DIM(line), "LOOKUP%s %s",
+ cache_only? " --cache-only":"", pattern);
+ xfree (pattern);
+ }
+ else
+ {
+ for (s=uri; *s; s++)
+ if (*s <= ' ')
+ {
+ if (ctx == dirmngr_ctx)
+ release_dirmngr (ctrl);
+ else
+ release_dirmngr2 (ctrl);
+ return gpg_error (GPG_ERR_INV_URI);
+ }
+ snprintf (line, DIM(line), "LOOKUP --url %s", uri);
+ }
+
+ parm.ctrl = ctrl;
+ parm.ctx = ctx;
+ parm.cb = cb;
+ parm.cb_value = cb_value;
+ parm.error = 0;
+ init_membuf (&parm.data, 4096);
+
+ rc = assuan_transact (ctx, line, lookup_cb, &parm,
+ NULL, NULL, lookup_status_cb, &parm);
+ xfree (get_membuf (&parm.data, &len));
+
+ if (ctx == dirmngr_ctx)
+ release_dirmngr (ctrl);
+ else
+ release_dirmngr2 (ctrl);
+
+ if (rc)
+ return rc;
+ return parm.error;
+}
+
+
+
+static gpg_error_t
+get_cached_cert_data_cb (void *opaque, const void *buffer, size_t length)
+{
+ struct membuf *mb = opaque;
+
+ if (buffer)
+ put_membuf (mb, buffer, length);
+ return 0;
+}
+
+/* Return a certificate from the Directory Manager's cache. This
+ function only returns one certificate which must be specified using
+ the fingerprint FPR and will be stored at R_CERT. On error NULL is
+ stored at R_CERT and an error code returned. Note that the caller
+ must provide the locked dirmngr context CTX. */
+static gpg_error_t
+get_cached_cert (assuan_context_t ctx,
+ const unsigned char *fpr, ksba_cert_t *r_cert)
+{
+ gpg_error_t err;
+ char line[ASSUAN_LINELENGTH];
+ char hexfpr[2*20+1];
+ struct membuf mb;
+ char *buf;
+ size_t buflen = 0;
+ ksba_cert_t cert;
+
+ *r_cert = NULL;
+
+ bin2hex (fpr, 20, hexfpr);
+ snprintf (line, DIM(line), "LOOKUP --single --cache-only 0x%s", hexfpr);
+
+ init_membuf (&mb, 4096);
+ err = assuan_transact (ctx, line, get_cached_cert_data_cb, &mb,
+ NULL, NULL, NULL, NULL);
+ buf = get_membuf (&mb, &buflen);
+ if (err)
+ {
+ xfree (buf);
+ return err;
+ }
+ if (!buf)
+ return gpg_error (GPG_ERR_ENOMEM);
+
+ err = ksba_cert_new (&cert);
+ if (err)
+ {
+ xfree (buf);
+ return err;
+ }
+ err = ksba_cert_init_from_mem (cert, buf, buflen);
+ xfree (buf);
+ if (err)
+ {
+ log_error ("failed to parse a certificate: %s\n", gpg_strerror (err));
+ ksba_cert_release (cert);
+ return err;
+ }
+
+ *r_cert = cert;
+ return 0;
+}
+
+
+
+/* Run Command helpers*/
+
+/* Fairly simple callback to write all output of dirmngr to stdout. */
+static gpg_error_t
+run_command_cb (void *opaque, const void *buffer, size_t length)
+{
+ (void)opaque;
+
+ if (buffer)
+ {
+ if ( fwrite (buffer, length, 1, stdout) != 1 )
+ log_error ("error writing to stdout: %s\n", strerror (errno));
+ }
+ return 0;
+}
+
+/* Handle inquiries from the dirmngr COMMAND. */
+static gpg_error_t
+run_command_inq_cb (void *opaque, const char *line)
+{
+ struct run_command_parm_s *parm = opaque;
+ const char *s;
+ int rc = 0;
+
+ if ((s = has_leading_keyword (line, "SENDCERT")))
+ { /* send the given certificate */
+ int err;
+ ksba_cert_t cert;
+ const unsigned char *der;
+ size_t derlen;
+
+ line = s;
+ if (!*line)
+ return gpg_error (GPG_ERR_ASS_PARAMETER);
+
+ err = gpgsm_find_cert (parm->ctrl, line, NULL, &cert, 1);
+ if (err)
+ {
+ log_error ("certificate not found: %s\n", gpg_strerror (err));
+ rc = gpg_error (GPG_ERR_NOT_FOUND);
+ }
+ else
+ {
+ der = ksba_cert_get_image (cert, &derlen);
+ if (!der)
+ rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+ else
+ rc = assuan_send_data (parm->ctx, der, derlen);
+ ksba_cert_release (cert);
+ }
+ }
+ else if ((s = has_leading_keyword (line, "PRINTINFO")))
+ { /* Simply show the message given in the argument. */
+ line = s;
+ log_info ("dirmngr: %s\n", line);
+ }
+ else if ((s = has_leading_keyword (line, "ISTRUSTED")))
+ {
+ /* The server is asking us whether the certificate is a trusted
+ root certificate. */
+ char fpr[41];
+ struct rootca_flags_s rootca_flags;
+ int n;
+
+ line = s;
+
+ for (s=line,n=0; hexdigitp (s); s++, n++)
+ ;
+ if (*s || n != 40)
+ return gpg_error (GPG_ERR_ASS_PARAMETER);
+ for (s=line, n=0; n < 40; s++, n++)
+ fpr[n] = (*s >= 'a')? (*s & 0xdf): *s;
+ fpr[n] = 0;
+
+ if (!gpgsm_agent_istrusted (parm->ctrl, NULL, fpr, &rootca_flags))
+ rc = assuan_send_data (parm->ctx, "1", 1);
+ else
+ rc = 0;
+ return rc;
+ }
+ else
+ {
+ log_error ("unsupported command inquiry '%s'\n", line);
+ rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+ }
+
+ return rc;
+}
+
+static gpg_error_t
+run_command_status_cb (void *opaque, const char *line)
+{
+ ctrl_t ctrl = opaque;
+ const char *s;
+
+ if (opt.verbose)
+ {
+ log_info ("dirmngr status: %s\n", line);
+ }
+ if ((s = has_leading_keyword (line, "PROGRESS")))
+ {
+ if (ctrl)
+ {
+ line = s;
+ if (gpgsm_status (ctrl, STATUS_PROGRESS, line))
+ return gpg_error (GPG_ERR_ASS_CANCELED);
+ }
+ }
+ return 0;
+}
+
+
+
+/* Pass COMMAND to dirmngr and print all output generated by Dirmngr
+ to stdout. A couple of inquiries are defined (see above). ARGC
+ arguments in ARGV are given to the Dirmngr. Spaces, plus and
+ percent characters within the argument strings are percent escaped
+ so that blanks can act as delimiters. */
+int
+gpgsm_dirmngr_run_command (ctrl_t ctrl, const char *command,
+ int argc, char **argv)
+{
+ int rc;
+ int i;
+ const char *s;
+ char *line, *p;
+ size_t len;
+ struct run_command_parm_s parm;
+
+ keydb_close_all_files ();
+
+ rc = start_dirmngr (ctrl);
+ if (rc)
+ return rc;
+
+ parm.ctrl = ctrl;
+ parm.ctx = dirmngr_ctx;
+
+ len = strlen (command) + 1;
+ for (i=0; i < argc; i++)
+ len += 1 + 3*strlen (argv[i]); /* enough space for percent escaping */
+ line = xtrymalloc (len);
+ if (!line)
+ {
+ release_dirmngr (ctrl);
+ return out_of_core ();
+ }
+
+ p = stpcpy (line, command);
+ for (i=0; i < argc; i++)
+ {
+ *p++ = ' ';
+ for (s=argv[i]; *s; s++)
+ {
+ if (!isascii (*s))
+ *p++ = *s;
+ else if (*s == ' ')
+ *p++ = '+';
+ else if (!isprint (*s) || *s == '+')
+ {
+ sprintf (p, "%%%02X", *(const unsigned char *)s);
+ p += 3;
+ }
+ else
+ *p++ = *s;
+ }
+ }
+ *p = 0;
+
+ rc = assuan_transact (dirmngr_ctx, line,
+ run_command_cb, NULL,
+ run_command_inq_cb, &parm,
+ run_command_status_cb, ctrl);
+ xfree (line);
+ log_info ("response of dirmngr: %s\n", rc? gpg_strerror (rc): "okay");
+ release_dirmngr (ctrl);
+ return rc;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 14:36:23 +0000