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7a7a597827
* configure.ac: Don't check for PTH but for NPTH. (AH_BOTTOM): Remove PTH_SYSCALL_SOFT. (have_pth): Rename to ... (have_npth): ... this. (USE_GNU_NPTH): Rename to ... (USE_GNU_PTH): ... this. * m4/npth.m4: New file. * agent/Makefile.am, agent/cache.c, agent/call-pinentry.c, agent/call-scd.c, agent/findkey.c, agent/gpg-agent.c, agent/trustlist.c, common/Makefile.am, common/estream.c, common/exechelp-posix.c, common/exechelp-w32.c, common/exechelp-w32ce.c, common/http.c, common/init.c, common/sysutils.c, dirmngr/Makefile.am, dirmngr/crlfetch.c, dirmngr/dirmngr.c, dirmngr/dirmngr_ldap.c, dirmngr/ldap-wrapper-ce.c, dirmngr/ldap-wrapper.c, dirmngr/ldap.c, g13/Makefile.am, g13/call-gpg.c, g13/g13.c, g13/runner.c, scd/Makefile.am, scd/apdu.c, scd/app.c, scd/ccid-driver.c, scd/command.c, scd/scdaemon.c, tools/Makefile.am: Port to npth.
773 lines
22 KiB
C
773 lines
22 KiB
C
/* trustlist.c - Maintain the list of trusted keys
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* Copyright (C) 2002, 2004, 2006, 2007, 2009 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <npth.h>
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#include "agent.h"
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#include <assuan.h> /* fixme: need a way to avoid assuan calls here */
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#include "i18n.h"
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/* A structure to store the information from the trust file. */
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struct trustitem_s
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{
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struct
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{
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int disabled:1; /* This entry is disabled. */
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int for_pgp:1; /* Set by '*' or 'P' as first flag. */
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int for_smime:1; /* Set by '*' or 'S' as first flag. */
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int relax:1; /* Relax checking of root certificate
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constraints. */
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int cm:1; /* Use chain model for validation. */
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} flags;
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unsigned char fpr[20]; /* The binary fingerprint. */
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};
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typedef struct trustitem_s trustitem_t;
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/* Malloced table and its allocated size with all trust items. */
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static trustitem_t *trusttable;
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static size_t trusttablesize;
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/* A mutex used to protect the table. */
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static npth_mutex_t trusttable_lock;
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static const char headerblurb[] =
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"# This is the list of trusted keys. Comment lines, like this one, as\n"
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"# well as empty lines are ignored. Lines have a length limit but this\n"
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"# is not a serious limitation as the format of the entries is fixed and\n"
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"# checked by gpg-agent. A non-comment line starts with optional white\n"
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"# space, followed by the SHA-1 fingerpint in hex, followed by a flag\n"
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"# which may be one of 'P', 'S' or '*' and optionally followed by a list of\n"
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"# other flags. The fingerprint may be prefixed with a '!' to mark the\n"
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"# key as not trusted. You should give the gpg-agent a HUP or run the\n"
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"# command \"gpgconf --reload gpg-agent\" after changing this file.\n"
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"\n\n"
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"# Include the default trust list\n"
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"include-default\n"
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"\n";
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/* This function must be called once to initialize this module. This
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has to be done before a second thread is spawned. We can't do the
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static initialization because Pth emulation code might not be able
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to do a static init; in particular, it is not possible for W32. */
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void
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initialize_module_trustlist (void)
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{
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static int initialized;
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int err;
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if (!initialized)
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{
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err = npth_mutex_init (&trusttable_lock, NULL);
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if (err)
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log_fatal ("error initializing mutex: %s\n", strerror (err));
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initialized = 1;
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}
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}
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static void
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lock_trusttable (void)
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{
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int err;
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err = npth_mutex_lock (&trusttable_lock);
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if (err)
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log_fatal ("failed to acquire mutex in %s: %s\n", __FILE__, strerror (err));
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}
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static void
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unlock_trusttable (void)
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{
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int err;
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err = npth_mutex_unlock (&trusttable_lock);
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if (err)
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log_fatal ("failed to release mutex in %s: %s\n", __FILE__, strerror (err));
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}
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static gpg_error_t
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read_one_trustfile (const char *fname, int allow_include,
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trustitem_t **addr_of_table,
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size_t *addr_of_tablesize,
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int *addr_of_tableidx)
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{
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gpg_error_t err = 0;
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estream_t fp;
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int n, c;
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char *p, line[256];
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trustitem_t *table, *ti;
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int tableidx;
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size_t tablesize;
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int lnr = 0;
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table = *addr_of_table;
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tablesize = *addr_of_tablesize;
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tableidx = *addr_of_tableidx;
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fp = es_fopen (fname, "r");
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if (!fp)
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{
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err = gpg_error_from_syserror ();
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log_error (_("error opening `%s': %s\n"), fname, gpg_strerror (err));
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goto leave;
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}
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while (es_fgets (line, DIM(line)-1, fp))
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{
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lnr++;
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n = strlen (line);
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if (!n || line[n-1] != '\n')
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{
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/* Eat until end of line. */
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while ( (c=es_getc (fp)) != EOF && c != '\n')
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;
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err = gpg_error (*line? GPG_ERR_LINE_TOO_LONG
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: GPG_ERR_INCOMPLETE_LINE);
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log_error (_("file `%s', line %d: %s\n"),
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fname, lnr, gpg_strerror (err));
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continue;
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}
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line[--n] = 0; /* Chop the LF. */
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if (n && line[n-1] == '\r')
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line[--n] = 0; /* Chop an optional CR. */
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/* Allow for empty lines and spaces */
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for (p=line; spacep (p); p++)
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;
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if (!*p || *p == '#')
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continue;
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if (!strncmp (p, "include-default", 15)
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&& (!p[15] || spacep (p+15)))
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{
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char *etcname;
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gpg_error_t err2;
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if (!allow_include)
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{
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log_error (_("statement \"%s\" ignored in `%s', line %d\n"),
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"include-default", fname, lnr);
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continue;
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}
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/* fixme: Should check for trailing garbage. */
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etcname = make_filename (gnupg_sysconfdir (), "trustlist.txt", NULL);
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if ( !strcmp (etcname, fname) ) /* Same file. */
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log_info (_("statement \"%s\" ignored in `%s', line %d\n"),
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"include-default", fname, lnr);
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else if ( access (etcname, F_OK) && errno == ENOENT )
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{
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/* A non existent system trustlist is not an error.
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Just print a note. */
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log_info (_("system trustlist `%s' not available\n"), etcname);
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}
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else
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{
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err2 = read_one_trustfile (etcname, 0,
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&table, &tablesize, &tableidx);
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if (err2)
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err = err2;
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}
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xfree (etcname);
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continue;
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}
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if (tableidx == tablesize) /* Need more space. */
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{
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trustitem_t *tmp;
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size_t tmplen;
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tmplen = tablesize + 20;
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tmp = xtryrealloc (table, tmplen * sizeof *table);
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if (!tmp)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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table = tmp;
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tablesize = tmplen;
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}
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ti = table + tableidx;
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memset (&ti->flags, 0, sizeof ti->flags);
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if (*p == '!')
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{
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ti->flags.disabled = 1;
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p++;
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while (spacep (p))
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p++;
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}
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n = hexcolon2bin (p, ti->fpr, 20);
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if (n < 0)
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{
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log_error (_("bad fingerprint in `%s', line %d\n"), fname, lnr);
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err = gpg_error (GPG_ERR_BAD_DATA);
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continue;
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}
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p += n;
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for (; spacep (p); p++)
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;
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/* Process the first flag which needs to be the first for
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backward compatibility. */
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if (!*p || *p == '*' )
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{
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ti->flags.for_smime = 1;
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ti->flags.for_pgp = 1;
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}
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else if ( *p == 'P' || *p == 'p')
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{
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ti->flags.for_pgp = 1;
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}
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else if ( *p == 'S' || *p == 's')
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{
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ti->flags.for_smime = 1;
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}
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else
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{
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log_error (_("invalid keyflag in `%s', line %d\n"), fname, lnr);
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err = gpg_error (GPG_ERR_BAD_DATA);
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continue;
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}
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p++;
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if ( *p && !spacep (p) )
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{
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log_error (_("invalid keyflag in `%s', line %d\n"), fname, lnr);
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err = gpg_error (GPG_ERR_BAD_DATA);
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continue;
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}
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/* Now check for more key-value pairs of the form NAME[=VALUE]. */
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while (*p)
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{
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for (; spacep (p); p++)
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;
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if (!*p)
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break;
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n = strcspn (p, "= \t");
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if (p[n] == '=')
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{
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log_error ("assigning a value to a flag is not yet supported; "
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"in `%s', line %d\n", fname, lnr);
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err = gpg_error (GPG_ERR_BAD_DATA);
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p++;
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}
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else if (n == 5 && !memcmp (p, "relax", 5))
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ti->flags.relax = 1;
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else if (n == 2 && !memcmp (p, "cm", 2))
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ti->flags.cm = 1;
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else
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log_error ("flag `%.*s' in `%s', line %d ignored\n",
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n, p, fname, lnr);
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p += n;
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}
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tableidx++;
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}
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if ( !err && !es_feof (fp) )
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{
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err = gpg_error_from_syserror ();
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log_error (_("error reading `%s', line %d: %s\n"),
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fname, lnr, gpg_strerror (err));
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}
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leave:
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es_fclose (fp);
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*addr_of_table = table;
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*addr_of_tablesize = tablesize;
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*addr_of_tableidx = tableidx;
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return err;
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}
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/* Read the trust files and update the global table on success. */
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static gpg_error_t
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read_trustfiles (void)
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{
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gpg_error_t err;
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trustitem_t *table, *ti;
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int tableidx;
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size_t tablesize;
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char *fname;
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int allow_include = 1;
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tablesize = 20;
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table = xtrycalloc (tablesize, sizeof *table);
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if (!table)
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return gpg_error_from_syserror ();
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tableidx = 0;
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fname = make_filename (opt.homedir, "trustlist.txt", NULL);
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if ( access (fname, F_OK) )
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{
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if ( errno == ENOENT )
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; /* Silently ignore a non-existing trustfile. */
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else
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{
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err = gpg_error_from_syserror ();
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log_error (_("error opening `%s': %s\n"), fname, gpg_strerror (err));
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}
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xfree (fname);
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fname = make_filename (gnupg_sysconfdir (), "trustlist.txt", NULL);
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allow_include = 0;
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}
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err = read_one_trustfile (fname, allow_include,
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&table, &tablesize, &tableidx);
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xfree (fname);
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if (err)
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{
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xfree (table);
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if (gpg_err_code (err) == GPG_ERR_ENOENT)
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{
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/* Take a missing trustlist as an empty one. */
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lock_trusttable ();
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xfree (trusttable);
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trusttable = NULL;
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trusttablesize = 0;
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unlock_trusttable ();
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err = 0;
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}
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return err;
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}
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/* Fixme: we should drop duplicates and sort the table. */
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ti = xtryrealloc (table, (tableidx?tableidx:1) * sizeof *table);
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if (!ti)
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{
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err = gpg_error_from_syserror ();
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xfree (table);
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return err;
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}
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lock_trusttable ();
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xfree (trusttable);
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trusttable = ti;
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trusttablesize = tableidx;
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unlock_trusttable ();
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return 0;
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}
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/* Check whether the given fpr is in our trustdb. We expect FPR to be
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an all uppercase hexstring of 40 characters. */
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gpg_error_t
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agent_istrusted (ctrl_t ctrl, const char *fpr, int *r_disabled)
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{
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gpg_error_t err;
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trustitem_t *ti;
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size_t len;
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unsigned char fprbin[20];
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if (r_disabled)
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*r_disabled = 0;
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if ( hexcolon2bin (fpr, fprbin, 20) < 0 )
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return gpg_error (GPG_ERR_INV_VALUE);
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if (!trusttable)
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{
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err = read_trustfiles ();
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if (err)
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{
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log_error (_("error reading list of trusted root certificates\n"));
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return err;
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}
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}
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if (trusttable)
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{
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for (ti=trusttable, len = trusttablesize; len; ti++, len--)
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if (!memcmp (ti->fpr, fprbin, 20))
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{
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if (ti->flags.disabled && r_disabled)
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*r_disabled = 1;
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if (ti->flags.relax)
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{
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err = agent_write_status (ctrl,
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"TRUSTLISTFLAG", "relax",
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NULL);
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if (err)
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return err;
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}
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else if (ti->flags.cm)
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{
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err = agent_write_status (ctrl,
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"TRUSTLISTFLAG", "cm",
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NULL);
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if (err)
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return err;
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}
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return ti->flags.disabled? gpg_error (GPG_ERR_NOT_TRUSTED) : 0;
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}
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}
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return gpg_error (GPG_ERR_NOT_TRUSTED);
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}
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/* Write all trust entries to FP. */
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gpg_error_t
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agent_listtrusted (void *assuan_context)
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{
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trustitem_t *ti;
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char key[51];
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gpg_error_t err;
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size_t len;
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if (!trusttable)
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{
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err = read_trustfiles ();
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if (err)
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{
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log_error (_("error reading list of trusted root certificates\n"));
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return err;
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}
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}
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if (trusttable)
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{
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/* We need to lock the table because the scheduler may interrupt
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assuan_send_data and an other thread may then re-read the table. */
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lock_trusttable ();
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for (ti=trusttable, len = trusttablesize; len; ti++, len--)
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{
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if (ti->flags.disabled)
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continue;
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bin2hex (ti->fpr, 20, key);
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key[40] = ' ';
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key[41] = ((ti->flags.for_smime && ti->flags.for_pgp)? '*'
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: ti->flags.for_smime? 'S': ti->flags.for_pgp? 'P':' ');
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key[42] = '\n';
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assuan_send_data (assuan_context, key, 43);
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assuan_send_data (assuan_context, NULL, 0); /* flush */
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}
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unlock_trusttable ();
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}
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return 0;
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}
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/* Create a copy of string with colons inserted after each two bytes.
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Caller needs to release the string. In case of a memory failure,
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NULL is returned. */
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static char *
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insert_colons (const char *string)
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{
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char *buffer, *p;
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size_t n = strlen (string);
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size_t nnew = n + (n+1)/2;
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p = buffer = xtrymalloc ( nnew + 1 );
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if (!buffer)
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return NULL;
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while (*string)
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{
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*p++ = *string++;
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if (*string)
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{
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*p++ = *string++;
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if (*string)
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*p++ = ':';
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}
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}
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*p = 0;
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assert (strlen (buffer) <= nnew);
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return buffer;
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}
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/* To pretty print DNs in the Pinentry, we replace slashes by
|
||
REPLSTRING. The caller needs to free the returned string. NULL is
|
||
returned on error with ERRNO set. */
|
||
static char *
|
||
reformat_name (const char *name, const char *replstring)
|
||
{
|
||
const char *s;
|
||
char *newname;
|
||
char *d;
|
||
size_t count;
|
||
size_t replstringlen = strlen (replstring);
|
||
|
||
/* If the name does not start with a slash it is not a preformatted
|
||
DN and thus we don't bother to reformat it. */
|
||
if (*name != '/')
|
||
return xtrystrdup (name);
|
||
|
||
/* Count the names. Note that a slash contained in a DN part is
|
||
expected to be C style escaped and thus the slashes we see here
|
||
are the actual part delimiters. */
|
||
for (s=name+1, count=0; *s; s++)
|
||
if (*s == '/')
|
||
count++;
|
||
newname = xtrymalloc (strlen (name) + count*replstringlen + 1);
|
||
if (!newname)
|
||
return NULL;
|
||
for (s=name+1, d=newname; *s; s++)
|
||
if (*s == '/')
|
||
d = stpcpy (d, replstring);
|
||
else
|
||
*d++ = *s;
|
||
*d = 0;
|
||
return newname;
|
||
}
|
||
|
||
|
||
/* Insert the given fpr into our trustdb. We expect FPR to be an all
|
||
uppercase hexstring of 40 characters. FLAG is either 'P' or 'C'.
|
||
This function does first check whether that key has already been put
|
||
into the trustdb and returns success in this case. Before a FPR
|
||
actually gets inserted, the user is asked by means of the Pinentry
|
||
whether this is actual want he wants to do. */
|
||
gpg_error_t
|
||
agent_marktrusted (ctrl_t ctrl, const char *name, const char *fpr, int flag)
|
||
{
|
||
gpg_error_t err = 0;
|
||
char *desc;
|
||
char *fname;
|
||
estream_t fp;
|
||
char *fprformatted;
|
||
char *nameformatted;
|
||
int is_disabled;
|
||
int yes_i_trust;
|
||
|
||
/* Check whether we are at all allowed to modify the trustlist.
|
||
This is useful so that the trustlist may be a symlink to a global
|
||
trustlist with only admin priviliges to modify it. Of course
|
||
this is not a secure way of denying access, but it avoids the
|
||
usual clicking on an Okay button most users are used to. */
|
||
fname = make_filename (opt.homedir, "trustlist.txt", NULL);
|
||
if ( access (fname, W_OK) && errno != ENOENT)
|
||
{
|
||
xfree (fname);
|
||
return gpg_error (GPG_ERR_EPERM);
|
||
}
|
||
xfree (fname);
|
||
|
||
if (!agent_istrusted (ctrl, fpr, &is_disabled))
|
||
{
|
||
return 0; /* We already got this fingerprint. Silently return
|
||
success. */
|
||
}
|
||
|
||
/* This feature must explicitly been enabled. */
|
||
if (!opt.allow_mark_trusted)
|
||
return gpg_error (GPG_ERR_NOT_SUPPORTED);
|
||
|
||
if (is_disabled)
|
||
{
|
||
/* There is an disabled entry in the trustlist. Return an error
|
||
so that the user won't be asked again for that one. Changing
|
||
this flag with the integrated marktrusted feature is and will
|
||
not be made possible. */
|
||
return gpg_error (GPG_ERR_NOT_TRUSTED);
|
||
}
|
||
|
||
|
||
/* Insert a new one. */
|
||
nameformatted = reformat_name (name, "%0A ");
|
||
if (!nameformatted)
|
||
return gpg_error_from_syserror ();
|
||
|
||
/* First a general question whether this is trusted. */
|
||
desc = xtryasprintf (
|
||
/* TRANSLATORS: This prompt is shown by the Pinentry
|
||
and has one special property: A "%%0A" is used by
|
||
Pinentry to insert a line break. The double
|
||
percent sign is actually needed because it is also
|
||
a printf format string. If you need to insert a
|
||
plain % sign, you need to encode it as "%%25". The
|
||
"%s" gets replaced by the name as stored in the
|
||
certificate. */
|
||
_("Do you ultimately trust%%0A"
|
||
" \"%s\"%%0A"
|
||
"to correctly certify user certificates?"),
|
||
nameformatted);
|
||
if (!desc)
|
||
{
|
||
xfree (nameformatted);
|
||
return out_of_core ();
|
||
}
|
||
err = agent_get_confirmation (ctrl, desc, _("Yes"), _("No"), 1);
|
||
xfree (desc);
|
||
if (!err)
|
||
yes_i_trust = 1;
|
||
else if (gpg_err_code (err) == GPG_ERR_NOT_CONFIRMED)
|
||
yes_i_trust = 0;
|
||
else
|
||
{
|
||
xfree (nameformatted);
|
||
return err;
|
||
}
|
||
|
||
|
||
fprformatted = insert_colons (fpr);
|
||
if (!fprformatted)
|
||
{
|
||
xfree (nameformatted);
|
||
return out_of_core ();
|
||
}
|
||
|
||
/* If the user trusts this certificate he has to verify the
|
||
fingerprint of course. */
|
||
if (yes_i_trust)
|
||
{
|
||
desc = xtryasprintf
|
||
(
|
||
/* TRANSLATORS: This prompt is shown by the Pinentry and has
|
||
one special property: A "%%0A" is used by Pinentry to
|
||
insert a line break. The double percent sign is actually
|
||
needed because it is also a printf format string. If you
|
||
need to insert a plain % sign, you need to encode it as
|
||
"%%25". The second "%s" gets replaced by a hexdecimal
|
||
fingerprint string whereas the first one receives the name
|
||
as stored in the certificate. */
|
||
_("Please verify that the certificate identified as:%%0A"
|
||
" \"%s\"%%0A"
|
||
"has the fingerprint:%%0A"
|
||
" %s"), nameformatted, fprformatted);
|
||
if (!desc)
|
||
{
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return out_of_core ();
|
||
}
|
||
|
||
/* TRANSLATORS: "Correct" is the label of a button and intended
|
||
to be hit if the fingerprint matches the one of the CA. The
|
||
other button is "the default "Cancel" of the Pinentry. */
|
||
err = agent_get_confirmation (ctrl, desc, _("Correct"), _("Wrong"), 1);
|
||
xfree (desc);
|
||
if (gpg_err_code (err) == GPG_ERR_NOT_CONFIRMED)
|
||
yes_i_trust = 0;
|
||
else if (err)
|
||
{
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return err;
|
||
}
|
||
}
|
||
|
||
|
||
/* Now check again to avoid duplicates. We take the lock to make
|
||
sure that nobody else plays with our file and force a reread. */
|
||
lock_trusttable ();
|
||
agent_reload_trustlist ();
|
||
if (!agent_istrusted (ctrl, fpr, &is_disabled) || is_disabled)
|
||
{
|
||
unlock_trusttable ();
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return is_disabled? gpg_error (GPG_ERR_NOT_TRUSTED) : 0;
|
||
}
|
||
|
||
fname = make_filename (opt.homedir, "trustlist.txt", NULL);
|
||
if ( access (fname, F_OK) && errno == ENOENT)
|
||
{
|
||
fp = es_fopen (fname, "wx,mode=-rw-r");
|
||
if (!fp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("can't create `%s': %s\n", fname, gpg_strerror (err));
|
||
xfree (fname);
|
||
unlock_trusttable ();
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return err;
|
||
}
|
||
es_fputs (headerblurb, fp);
|
||
es_fclose (fp);
|
||
}
|
||
fp = es_fopen (fname, "a+,mode=-rw-r");
|
||
if (!fp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("can't open `%s': %s\n", fname, gpg_strerror (err));
|
||
xfree (fname);
|
||
unlock_trusttable ();
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return err;
|
||
}
|
||
|
||
/* Append the key. */
|
||
es_fputs ("\n# ", fp);
|
||
xfree (nameformatted);
|
||
nameformatted = reformat_name (name, "\n# ");
|
||
if (!nameformatted || strchr (name, '\n'))
|
||
{
|
||
/* Note that there should never be a LF in NAME but we better
|
||
play safe and print a sanitized version in this case. */
|
||
es_write_sanitized (fp, name, strlen (name), NULL, NULL);
|
||
}
|
||
else
|
||
es_fputs (nameformatted, fp);
|
||
es_fprintf (fp, "\n%s%s %c\n", yes_i_trust?"":"!", fprformatted, flag);
|
||
if (es_ferror (fp))
|
||
err = gpg_error_from_syserror ();
|
||
|
||
if (es_fclose (fp))
|
||
err = gpg_error_from_syserror ();
|
||
|
||
agent_reload_trustlist ();
|
||
xfree (fname);
|
||
unlock_trusttable ();
|
||
xfree (fprformatted);
|
||
xfree (nameformatted);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* This function may be called to force reloading of the
|
||
trustlist. */
|
||
void
|
||
agent_reload_trustlist (void)
|
||
{
|
||
/* All we need to do is to delete the trusttable. At the next
|
||
access it will get re-read. */
|
||
lock_trusttable ();
|
||
xfree (trusttable);
|
||
trusttable = NULL;
|
||
trusttablesize = 0;
|
||
unlock_trusttable ();
|
||
bump_key_eventcounter ();
|
||
}
|