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certificate.c
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certificate.c
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/**
* @file certificate.c Public-Key Certificate API
* @ingroup core
*/
/*
*
* purple
*
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* This program 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.
*
* This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include "internal.h"
#include "certificate.h"
#include "dbus-maybe.h"
#include "debug.h"
#include "request.h"
#include "signals.h"
#include "util.h"
/** List holding pointers to all registered certificate schemes */
static GList *cert_schemes = NULL;
/** List of registered Verifiers */
static GList *cert_verifiers = NULL;
/** List of registered Pools */
static GList *cert_pools = NULL;
/*
* TODO: Merge this with PurpleCertificateVerificationStatus for 3.0.0 */
typedef enum {
PURPLE_CERTIFICATE_UNKNOWN_ERROR = -1,
/* Not an error */
PURPLE_CERTIFICATE_NO_PROBLEMS = 0,
/* Non-fatal */
PURPLE_CERTIFICATE_NON_FATALS_MASK = 0x0000FFFF,
/* The certificate is self-signed. */
PURPLE_CERTIFICATE_SELF_SIGNED = 0x01,
/* The CA is not in libpurple's pool of certificates. */
PURPLE_CERTIFICATE_CA_UNKNOWN = 0x02,
/* The current time is before the certificate's specified
* activation time.
*/
PURPLE_CERTIFICATE_NOT_ACTIVATED = 0x04,
/* The current time is after the certificate's specified expiration time */
PURPLE_CERTIFICATE_EXPIRED = 0x08,
/* The certificate's subject name doesn't match the expected */
PURPLE_CERTIFICATE_NAME_MISMATCH = 0x10,
/* No CA pool was found. This shouldn't happen... */
PURPLE_CERTIFICATE_NO_CA_POOL = 0x20,
/* Fatal */
PURPLE_CERTIFICATE_FATALS_MASK = 0xFFFF0000,
/* The signature chain could not be validated. Due to limitations in the
* the current API, this also indicates one of the CA certificates in the
* chain is expired (or not yet activated). FIXME 3.0.0 */
PURPLE_CERTIFICATE_INVALID_CHAIN = 0x10000,
/* The signature has been revoked. */
PURPLE_CERTIFICATE_REVOKED = 0x20000,
PURPLE_CERTIFICATE_LAST = 0x40000,
} PurpleCertificateInvalidityFlags;
static const gchar *
invalidity_reason_to_string(PurpleCertificateInvalidityFlags flag)
{
switch (flag) {
case PURPLE_CERTIFICATE_SELF_SIGNED:
return _("The certificate is self-signed and cannot be "
"automatically checked.");
break;
case PURPLE_CERTIFICATE_CA_UNKNOWN:
return _("The certificate is not trusted because no certificate "
"that can verify it is currently trusted.");
break;
case PURPLE_CERTIFICATE_NOT_ACTIVATED:
return _("The certificate is not valid yet. Check that your "
"computer's date and time are accurate.");
break;
case PURPLE_CERTIFICATE_EXPIRED:
return _("The certificate has expired and should not be "
"considered valid. Check that your computer's date "
"and time are accurate.");
break;
case PURPLE_CERTIFICATE_NAME_MISMATCH:
/* Translators: "domain" refers to a DNS domain (e.g. talk.google.com) */
return _("The certificate presented is not issued to this domain.");
break;
case PURPLE_CERTIFICATE_NO_CA_POOL:
return _("You have no database of root certificates, so "
"this certificate cannot be validated.");
break;
case PURPLE_CERTIFICATE_INVALID_CHAIN:
return _("The certificate chain presented is invalid.");
break;
case PURPLE_CERTIFICATE_REVOKED:
return _("The certificate has been revoked.");
break;
case PURPLE_CERTIFICATE_UNKNOWN_ERROR:
default:
return _("An unknown certificate error occurred.");
break;
}
}
void
purple_certificate_verify (PurpleCertificateVerifier *verifier,
const gchar *subject_name, GList *cert_chain,
PurpleCertificateVerifiedCallback cb,
gpointer cb_data)
{
PurpleCertificateVerificationRequest *vrq;
PurpleCertificateScheme *scheme;
g_return_if_fail(subject_name != NULL);
/* If you don't have a cert to check, why are you requesting that it
be verified? */
g_return_if_fail(cert_chain != NULL);
g_return_if_fail(cb != NULL);
/* Look up the CertificateScheme */
scheme = purple_certificate_find_scheme(verifier->scheme_name);
g_return_if_fail(scheme);
/* Check that at least the first cert in the chain matches the
Verifier scheme */
g_return_if_fail(scheme ==
((PurpleCertificate *) (cert_chain->data))->scheme);
/* Construct and fill in the request fields */
vrq = g_new0(PurpleCertificateVerificationRequest, 1);
vrq->verifier = verifier;
vrq->scheme = scheme;
vrq->subject_name = g_strdup(subject_name);
vrq->cert_chain = purple_certificate_copy_list(cert_chain);
vrq->cb = cb;
vrq->cb_data = cb_data;
/* Initiate verification */
(verifier->start_verification)(vrq);
}
void
purple_certificate_verify_complete(PurpleCertificateVerificationRequest *vrq,
PurpleCertificateVerificationStatus st)
{
PurpleCertificateVerifier *vr;
g_return_if_fail(vrq);
if (st == PURPLE_CERTIFICATE_VALID) {
purple_debug_info("certificate",
"Successfully verified certificate for %s\n",
vrq->subject_name);
} else {
purple_debug_error("certificate",
"Failed to verify certificate for %s\n",
vrq->subject_name);
}
/* Pass the results on to the request's callback */
(vrq->cb)(st, vrq->cb_data);
/* And now to eliminate the request */
/* Fetch the Verifier responsible... */
vr = vrq->verifier;
/* ...and order it to KILL */
(vr->destroy_request)(vrq);
/* Now the internals have been cleaned up, so clean up the libpurple-
created elements */
g_free(vrq->subject_name);
purple_certificate_destroy_list(vrq->cert_chain);
/* A structure born
* to much ado
* and with so much within.
* It reaches now
* its quiet end. */
g_free(vrq);
}
PurpleCertificate *
purple_certificate_copy(PurpleCertificate *crt)
{
g_return_val_if_fail(crt, NULL);
g_return_val_if_fail(crt->scheme, NULL);
g_return_val_if_fail(crt->scheme->copy_certificate, NULL);
return (crt->scheme->copy_certificate)(crt);
}
GList *
purple_certificate_copy_list(GList *crt_list)
{
GList *new_l, *l;
/* First, make a shallow copy of the list */
new_l = g_list_copy(crt_list);
/* Now go through and actually duplicate each certificate */
for (l = new_l; l; l = l->next) {
l->data = purple_certificate_copy(l->data);
}
return new_l;
}
void
purple_certificate_destroy (PurpleCertificate *crt)
{
PurpleCertificateScheme *scheme;
if (NULL == crt) return;
scheme = crt->scheme;
(scheme->destroy_certificate)(crt);
}
void
purple_certificate_destroy_list (GList * crt_list)
{
PurpleCertificate *crt;
GList *l;
for (l=crt_list; l; l = l->next) {
crt = (PurpleCertificate *) l->data;
purple_certificate_destroy(crt);
}
g_list_free(crt_list);
}
gboolean
purple_certificate_signed_by(PurpleCertificate *crt, PurpleCertificate *issuer)
{
PurpleCertificateScheme *scheme;
g_return_val_if_fail(crt, FALSE);
g_return_val_if_fail(issuer, FALSE);
scheme = crt->scheme;
g_return_val_if_fail(scheme, FALSE);
/* We can't compare two certs of unrelated schemes, obviously */
g_return_val_if_fail(issuer->scheme == scheme, FALSE);
return (scheme->signed_by)(crt, issuer);
}
gboolean
purple_certificate_check_signature_chain_with_failing(GList *chain,
PurpleCertificate **failing)
{
GList *cur;
PurpleCertificate *crt, *issuer;
gchar *uid;
time_t now, activation, expiration;
gboolean ret;
g_return_val_if_fail(chain, FALSE);
if (failing)
*failing = NULL;
uid = purple_certificate_get_unique_id((PurpleCertificate *) chain->data);
purple_debug_info("certificate",
"Checking signature chain for uid=%s\n",
uid);
g_free(uid);
/* If this is a single-certificate chain, say that it is valid */
if (chain->next == NULL) {
purple_debug_info("certificate",
"...Singleton. We'll say it's valid.\n");
return TRUE;
}
now = time(NULL);
/* Load crt with the first certificate */
crt = (PurpleCertificate *)(chain->data);
/* And start with the second certificate in the chain */
for ( cur = chain->next; cur; cur = cur->next ) {
issuer = (PurpleCertificate *)(cur->data);
uid = purple_certificate_get_unique_id(issuer);
ret = purple_certificate_get_times(issuer, &activation, &expiration);
if (!ret || now < activation || now > expiration) {
if (!ret)
purple_debug_error("certificate",
"...Failed to get validity times for certificate %s\n"
"Chain is INVALID\n", uid);
else if (now > expiration)
purple_debug_error("certificate",
"...Issuer %s expired at %s\nChain is INVALID\n",
uid, ctime(&expiration));
else
purple_debug_error("certificate",
"...Not-yet-activated issuer %s will be valid at %s\n"
"Chain is INVALID\n", uid, ctime(&activation));
if (failing)
*failing = crt;
g_free(uid);
return FALSE;
}
/* Check the signature for this link */
if (! purple_certificate_signed_by(crt, issuer) ) {
purple_debug_error("certificate",
"...Bad or missing signature by %s\nChain is INVALID\n",
uid);
g_free(uid);
if (failing)
*failing = crt;
return FALSE;
}
purple_debug_info("certificate",
"...Good signature by %s\n",
uid);
g_free(uid);
/* The issuer is now the next crt whose signature is to be
checked */
crt = issuer;
}
/* If control reaches this point, the chain is valid */
purple_debug_info("certificate", "Chain is VALID\n");
return TRUE;
}
gboolean
purple_certificate_check_signature_chain(GList *chain)
{
return purple_certificate_check_signature_chain_with_failing(chain, NULL);
}
PurpleCertificate *
purple_certificate_import(PurpleCertificateScheme *scheme, const gchar *filename)
{
g_return_val_if_fail(scheme, NULL);
g_return_val_if_fail(scheme->import_certificate, NULL);
g_return_val_if_fail(filename, NULL);
return (scheme->import_certificate)(filename);
}
GSList *
purple_certificates_import(PurpleCertificateScheme *scheme, const gchar *filename)
{
g_return_val_if_fail(scheme, NULL);
g_return_val_if_fail(scheme->import_certificates, NULL);
g_return_val_if_fail(filename, NULL);
return (scheme->import_certificates)(filename);
}
gboolean
purple_certificate_export(const gchar *filename, PurpleCertificate *crt)
{
PurpleCertificateScheme *scheme;
g_return_val_if_fail(filename, FALSE);
g_return_val_if_fail(crt, FALSE);
g_return_val_if_fail(crt->scheme, FALSE);
scheme = crt->scheme;
g_return_val_if_fail(scheme->export_certificate, FALSE);
return (scheme->export_certificate)(filename, crt);
}
static gboolean
byte_arrays_equal(const GByteArray *array1, const GByteArray *array2)
{
g_return_val_if_fail(array1 != NULL, FALSE);
g_return_val_if_fail(array2 != NULL, FALSE);
return (array1->len == array2->len) &&
(0 == memcmp(array1->data, array2->data, array1->len));
}
GByteArray *
purple_certificate_get_fingerprint_sha1(PurpleCertificate *crt)
{
PurpleCertificateScheme *scheme;
GByteArray *fpr;
g_return_val_if_fail(crt, NULL);
g_return_val_if_fail(crt->scheme, NULL);
scheme = crt->scheme;
g_return_val_if_fail(scheme->get_fingerprint_sha1, NULL);
fpr = (scheme->get_fingerprint_sha1)(crt);
return fpr;
}
gchar *
purple_certificate_get_unique_id(PurpleCertificate *crt)
{
g_return_val_if_fail(crt, NULL);
g_return_val_if_fail(crt->scheme, NULL);
g_return_val_if_fail(crt->scheme->get_unique_id, NULL);
return (crt->scheme->get_unique_id)(crt);
}
gchar *
purple_certificate_get_issuer_unique_id(PurpleCertificate *crt)
{
g_return_val_if_fail(crt, NULL);
g_return_val_if_fail(crt->scheme, NULL);
g_return_val_if_fail(crt->scheme->get_issuer_unique_id, NULL);
return (crt->scheme->get_issuer_unique_id)(crt);
}
gchar *
purple_certificate_get_subject_name(PurpleCertificate *crt)
{
PurpleCertificateScheme *scheme;
gchar *subject_name;
g_return_val_if_fail(crt, NULL);
g_return_val_if_fail(crt->scheme, NULL);
scheme = crt->scheme;
g_return_val_if_fail(scheme->get_subject_name, NULL);
subject_name = (scheme->get_subject_name)(crt);
return subject_name;
}
gboolean
purple_certificate_check_subject_name(PurpleCertificate *crt, const gchar *name)
{
PurpleCertificateScheme *scheme;
g_return_val_if_fail(crt, FALSE);
g_return_val_if_fail(crt->scheme, FALSE);
g_return_val_if_fail(name, FALSE);
scheme = crt->scheme;
g_return_val_if_fail(scheme->check_subject_name, FALSE);
return (scheme->check_subject_name)(crt, name);
}
gboolean
purple_certificate_get_times(PurpleCertificate *crt, time_t *activation, time_t *expiration)
{
PurpleCertificateScheme *scheme;
g_return_val_if_fail(crt, FALSE);
scheme = crt->scheme;
g_return_val_if_fail(scheme, FALSE);
/* If both provided references are NULL, what are you doing calling
this? */
g_return_val_if_fail( (activation != NULL) || (expiration != NULL), FALSE);
/* Throw the request on down to the certscheme */
return (scheme->get_times)(crt, activation, expiration);
}
gchar *
purple_certificate_pool_mkpath(PurpleCertificatePool *pool, const gchar *id)
{
gchar *path;
gchar *esc_scheme_name, *esc_name, *esc_id;
g_return_val_if_fail(pool, NULL);
g_return_val_if_fail(pool->scheme_name, NULL);
g_return_val_if_fail(pool->name, NULL);
/* Escape all the elements for filesystem-friendliness */
esc_scheme_name = pool ? g_strdup(purple_escape_filename(pool->scheme_name)) : NULL;
esc_name = pool ? g_strdup(purple_escape_filename(pool->name)) : NULL;
esc_id = id ? g_strdup(purple_escape_filename(id)) : NULL;
path = g_build_filename(purple_user_dir(),
"certificates", /* TODO: constantize this? */
esc_scheme_name,
esc_name,
esc_id,
NULL);
g_free(esc_scheme_name);
g_free(esc_name);
g_free(esc_id);
return path;
}
gboolean
purple_certificate_pool_usable(PurpleCertificatePool *pool)
{
g_return_val_if_fail(pool, FALSE);
g_return_val_if_fail(pool->scheme_name, FALSE);
/* Check that the pool's scheme is loaded */
if (purple_certificate_find_scheme(pool->scheme_name) == NULL) {
return FALSE;
}
return TRUE;
}
PurpleCertificateScheme *
purple_certificate_pool_get_scheme(PurpleCertificatePool *pool)
{
g_return_val_if_fail(pool, NULL);
g_return_val_if_fail(pool->scheme_name, NULL);
return purple_certificate_find_scheme(pool->scheme_name);
}
gboolean
purple_certificate_pool_contains(PurpleCertificatePool *pool, const gchar *id)
{
g_return_val_if_fail(pool, FALSE);
g_return_val_if_fail(id, FALSE);
g_return_val_if_fail(pool->cert_in_pool, FALSE);
return (pool->cert_in_pool)(id);
}
PurpleCertificate *
purple_certificate_pool_retrieve(PurpleCertificatePool *pool, const gchar *id)
{
g_return_val_if_fail(pool, NULL);
g_return_val_if_fail(id, NULL);
g_return_val_if_fail(pool->get_cert, NULL);
return (pool->get_cert)(id);
}
gboolean
purple_certificate_pool_store(PurpleCertificatePool *pool, const gchar *id, PurpleCertificate *crt)
{
gboolean ret = FALSE;
g_return_val_if_fail(pool, FALSE);
g_return_val_if_fail(id, FALSE);
g_return_val_if_fail(pool->put_cert, FALSE);
/* Whether crt->scheme matches find_scheme(pool->scheme_name) is not
relevant... I think... */
g_return_val_if_fail(
g_ascii_strcasecmp(pool->scheme_name, crt->scheme->name) == 0,
FALSE);
ret = (pool->put_cert)(id, crt);
/* Signal that the certificate was stored if success*/
if (ret) {
purple_signal_emit(pool, "certificate-stored",
pool, id);
}
return ret;
}
gboolean
purple_certificate_pool_delete(PurpleCertificatePool *pool, const gchar *id)
{
gboolean ret = FALSE;
g_return_val_if_fail(pool, FALSE);
g_return_val_if_fail(id, FALSE);
g_return_val_if_fail(pool->delete_cert, FALSE);
ret = (pool->delete_cert)(id);
/* Signal that the certificate was deleted if success */
if (ret) {
purple_signal_emit(pool, "certificate-deleted",
pool, id);
}
return ret;
}
GList *
purple_certificate_pool_get_idlist(PurpleCertificatePool *pool)
{
g_return_val_if_fail(pool, NULL);
g_return_val_if_fail(pool->get_idlist, NULL);
return (pool->get_idlist)();
}
void
purple_certificate_pool_destroy_idlist(GList *idlist)
{
GList *l;
/* Iterate through and free them strings */
for ( l = idlist; l; l = l->next ) {
g_free(l->data);
}
g_list_free(idlist);
}
/****************************************************************************/
/* Builtin Verifiers, Pools, etc. */
/****************************************************************************/
static void
x509_singleuse_verify_cb (PurpleCertificateVerificationRequest *vrq, gint id)
{
g_return_if_fail(vrq);
purple_debug_info("certificate/x509_singleuse",
"VRQ on cert from %s gave %d\n",
vrq->subject_name, id);
/* Signal what happened back to the caller */
if (1 == id) {
/* Accepted! */
purple_certificate_verify_complete(vrq,
PURPLE_CERTIFICATE_VALID);
} else {
/* Not accepted */
purple_certificate_verify_complete(vrq,
PURPLE_CERTIFICATE_INVALID);
}
}
static void
x509_singleuse_start_verify (PurpleCertificateVerificationRequest *vrq)
{
gchar *sha_asc;
GByteArray *sha_bin;
gchar *cn;
const gchar *cn_match;
gchar *primary, *secondary;
PurpleCertificate *crt = (PurpleCertificate *) vrq->cert_chain->data;
/* Pull out the SHA1 checksum */
sha_bin = purple_certificate_get_fingerprint_sha1(crt);
/* Now decode it for display */
sha_asc = purple_base16_encode_chunked(sha_bin->data,
sha_bin->len);
/* Get the cert Common Name */
cn = purple_certificate_get_subject_name(crt);
/* Determine whether the name matches */
if (purple_certificate_check_subject_name(crt, vrq->subject_name)) {
cn_match = "";
} else {
cn_match = _("(DOES NOT MATCH)");
}
/* Make messages */
primary = g_strdup_printf(_("%s has presented the following certificate for just-this-once use:"), vrq->subject_name);
secondary = g_strdup_printf(_("Common name: %s %s\nFingerprint (SHA1): %s"), cn, cn_match, sha_asc);
/* Make a semi-pretty display */
purple_request_accept_cancel(
vrq->cb_data, /* TODO: Find what the handle ought to be */
_("Single-use Certificate Verification"),
primary,
secondary,
0, /* Accept by default */
NULL, /* No account */
NULL, /* No other user */
NULL, /* No associated conversation */
vrq,
x509_singleuse_verify_cb,
x509_singleuse_verify_cb );
/* Cleanup */
g_free(cn);
g_free(primary);
g_free(secondary);
g_free(sha_asc);
g_byte_array_free(sha_bin, TRUE);
}
static void
x509_singleuse_destroy_request (PurpleCertificateVerificationRequest *vrq)
{
/* I don't do anything! */
}
static PurpleCertificateVerifier x509_singleuse = {
"x509", /* Scheme name */
"singleuse", /* Verifier name */
x509_singleuse_start_verify, /* start_verification function */
x509_singleuse_destroy_request, /* Request cleanup operation */
NULL,
NULL,
NULL,
NULL
};
/***** X.509 Certificate Authority pool, keyed by Distinguished Name *****/
/* This is implemented in what may be the most inefficient and bugprone way
possible; however, future optimizations should not be difficult. */
static PurpleCertificatePool x509_ca;
/** Holds a key-value pair for quickish certificate lookup */
typedef struct {
gchar *dn;
PurpleCertificate *crt;
} x509_ca_element;
static void
x509_ca_element_free(x509_ca_element *el)
{
if (NULL == el) return;
g_free(el->dn);
purple_certificate_destroy(el->crt);
g_free(el);
}
/** System directory to probe for CA certificates */
/* This is set in the lazy_init function */
static GList *x509_ca_paths = NULL;
/** A list of loaded CAs, populated from the above path whenever the lazy_init
happens. Contains pointers to x509_ca_elements */
static GList *x509_ca_certs = NULL;
/** Used for lazy initialization purposes. */
static gboolean x509_ca_initialized = FALSE;
/** Adds a certificate to the in-memory cache, doing nothing else */
static gboolean
x509_ca_quiet_put_cert(PurpleCertificate *crt)
{
x509_ca_element *el;
/* lazy_init calls this function, so calling lazy_init here is a
Bad Thing */
g_return_val_if_fail(crt, FALSE);
g_return_val_if_fail(crt->scheme, FALSE);
/* Make sure that this is some kind of X.509 certificate */
/* TODO: Perhaps just check crt->scheme->name instead? */
g_return_val_if_fail(crt->scheme == purple_certificate_find_scheme(x509_ca.scheme_name), FALSE);
el = g_new0(x509_ca_element, 1);
el->dn = purple_certificate_get_unique_id(crt);
el->crt = purple_certificate_copy(crt);
x509_ca_certs = g_list_prepend(x509_ca_certs, el);
return TRUE;
}
/* Since the libpurple CertificatePools get registered before plugins are
loaded, an X.509 Scheme is generally not available when x509_ca_init is
called, but x509_ca requires X.509 operations in order to properly load.
To solve this, I present the lazy_init function. It attempts to finish
initialization of the Pool, but it usually fails when it is called from
x509_ca_init. However, this is OK; initialization is then simply deferred
until someone tries to use functions from the pool. */
static gboolean
x509_ca_lazy_init(void)
{
PurpleCertificateScheme *x509;
GDir *certdir;
const gchar *entry;
GPatternSpec *pempat, *crtpat;
GList *iter = NULL;
GSList *crts = NULL;
if (x509_ca_initialized) return TRUE;
/* Check that X.509 is registered */
x509 = purple_certificate_find_scheme(x509_ca.scheme_name);
if ( !x509 ) {
purple_debug_warning("certificate/x509/ca",
"Lazy init failed because an X.509 Scheme "
"is not yet registered. Maybe it will be "
"better later.\n");
return FALSE;
}
/* Use a glob to only read .pem files */
pempat = g_pattern_spec_new("*.pem");
crtpat = g_pattern_spec_new("*.crt");
/* Populate the certificates pool from the search path(s) */
for (iter = x509_ca_paths; iter; iter = iter->next) {
certdir = g_dir_open(iter->data, 0, NULL);
if (!certdir) {
purple_debug_error("certificate/x509/ca", "Couldn't open location '%s'\n", (const char *)iter->data);
continue;
}
while ( (entry = g_dir_read_name(certdir)) ) {
gchar *fullpath;
PurpleCertificate *crt;
if (!g_pattern_match_string(pempat, entry) && !g_pattern_match_string(crtpat, entry)) {
continue;
}
fullpath = g_build_filename(iter->data, entry, NULL);
/* TODO: Respond to a failure in the following? */
crts = purple_certificates_import(x509, fullpath);
while (crts && crts->data) {
crt = crts->data;
if (x509_ca_quiet_put_cert(crt)) {
gchar *name;
name = purple_certificate_get_subject_name(crt);
purple_debug_info("certificate/x509/ca",
"Loaded %s from %s\n",
name ? name : "(unknown)", fullpath);
g_free(name);
} else {
purple_debug_error("certificate/x509/ca",
"Failed to load certificate from %s\n",
fullpath);
}
purple_certificate_destroy(crt);
crts = g_slist_delete_link(crts, crts);
}
g_free(fullpath);
}
g_dir_close(certdir);
}
g_pattern_spec_free(pempat);
g_pattern_spec_free(crtpat);
purple_debug_info("certificate/x509/ca",
"Lazy init completed.\n");
x509_ca_initialized = TRUE;
return TRUE;
}
static gboolean
x509_ca_init(void)
{
/* Attempt to point at the appropriate system path */
if (NULL == x509_ca_paths) {
#ifdef _WIN32
x509_ca_paths = g_list_append(NULL, g_build_filename(DATADIR,
"ca-certs", NULL));
#else
# ifdef SSL_CERTIFICATES_DIR
x509_ca_paths = g_list_append(NULL, g_strdup(SSL_CERTIFICATES_DIR));
# endif
x509_ca_paths = g_list_append(x509_ca_paths,
g_build_filename(DATADIR, "purple", "ca-certs", NULL));
#endif
}
/* Attempt to initialize now, but if it doesn't work, that's OK;
it will get done later */
if ( ! x509_ca_lazy_init()) {
purple_debug_info("certificate/x509/ca",
"Init failed, probably because a "
"dependency is not yet registered. "
"It has been deferred to later.\n");
}
return TRUE;
}
static void
x509_ca_uninit(void)
{
GList *l;
for (l = x509_ca_certs; l; l = l->next) {
x509_ca_element *el = l->data;
x509_ca_element_free(el);
}
g_list_free(x509_ca_certs);
x509_ca_certs = NULL;
x509_ca_initialized = FALSE;
g_list_foreach(x509_ca_paths, (GFunc)g_free, NULL);
g_list_free(x509_ca_paths);
x509_ca_paths = NULL;
}
/** Look up a ca_element by dn */
static x509_ca_element *
x509_ca_locate_cert(GList *lst, const gchar *dn)
{
GList *cur;
for (cur = lst; cur; cur = cur->next) {
x509_ca_element *el = cur->data;
if (purple_strequal(dn, el->dn)) {
return el;
}
}
return NULL;
}
static GSList *
x509_ca_locate_certs(GList *lst, const gchar *dn)
{
GList *cur;
GSList *crts = NULL;
for (cur = lst; cur; cur = cur->next) {
x509_ca_element *el = cur->data;
if (purple_strequal(dn, el->dn)) {
crts = g_slist_prepend(crts, el);
}
}
return crts;
}
static gboolean
x509_ca_cert_in_pool(const gchar *id)
{
g_return_val_if_fail(x509_ca_lazy_init(), FALSE);
g_return_val_if_fail(id, FALSE);
if (x509_ca_locate_cert(x509_ca_certs, id) != NULL) {
return TRUE;
} else {
return FALSE;
}
return FALSE;
}
static PurpleCertificate *
x509_ca_get_cert(const gchar *id)
{
PurpleCertificate *crt = NULL;
x509_ca_element *el;
g_return_val_if_fail(x509_ca_lazy_init(), NULL);
g_return_val_if_fail(id, NULL);
/* Search the memory-cached pool */
el = x509_ca_locate_cert(x509_ca_certs, id);
if (el != NULL) {
/* Make a copy of the memcached one for the function caller
to play with */
crt = purple_certificate_copy(el->crt);
} else {
crt = NULL;
}