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claws-mail/src/common/ssl_certificate.c
Ricardo Mones 6fc7c18a81 Switch core from strerror to g_strerror
2015-05-18 22:42:37 +02:00

1083 lines
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/*
* Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
* Copyright (C) 1999-2015 Colin Leroy <colin@colino.net>
* and the Claws Mail team
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#include "claws-features.h"
#endif
#ifdef USE_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/pkcs12.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <stdio.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <errno.h>
#ifdef G_OS_WIN32
# include <winsock2.h>
#else
# include <sys/socket.h>
# include <netinet/in.h>
# include <netdb.h>
#endif /* G_OS_WIN32 */
#include "ssl_certificate.h"
#include "utils.h"
#include "log.h"
#include "socket.h"
#include "hooks.h"
#include "defs.h"
static GHashTable *warned_expired = NULL;
gboolean prefs_common_unsafe_ssl_certs(void);
static gchar *get_certificate_path(const gchar *host, const gchar *port, const gchar *fp)
{
if (fp != NULL && prefs_common_unsafe_ssl_certs())
return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
"certs", G_DIR_SEPARATOR_S,
host, ".", port, ".", fp, ".cert", NULL);
else
return g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
"certs", G_DIR_SEPARATOR_S,
host, ".", port, ".cert", NULL);
}
static gchar *get_certificate_chain_path(const gchar *host, const gchar *port, const gchar *fp)
{
gchar *tmp = get_certificate_path(host, port, fp);
gchar *result = g_strconcat(tmp, ".chain", NULL);
g_free(tmp);
return result;
}
char * readable_fingerprint(unsigned char *src, int len)
{
int i=0;
char * ret;
if (src == NULL)
return NULL;
ret = g_strdup("");
while (i < len) {
char *tmp2;
if(i>0)
tmp2 = g_strdup_printf("%s:%02X", ret, src[i]);
else
tmp2 = g_strdup_printf("%02X", src[i]);
g_free(ret);
ret = g_strdup(tmp2);
g_free(tmp2);
i++;
}
return ret;
}
#if USE_GNUTLS
static gnutls_x509_crt_t x509_crt_copy(gnutls_x509_crt_t src)
{
int ret;
size_t size;
gnutls_datum_t tmp;
gnutls_x509_crt_t dest;
size = 0;
if (gnutls_x509_crt_init(&dest) != 0) {
g_warning("couldn't gnutls_x509_crt_init\n");
return NULL;
}
if (gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, NULL, &size)
!= GNUTLS_E_SHORT_MEMORY_BUFFER) {
g_warning("couldn't gnutls_x509_crt_export to get size\n");
gnutls_x509_crt_deinit(dest);
return NULL;
}
tmp.data = malloc(size);
memset(tmp.data, 0, size);
ret = gnutls_x509_crt_export(src, GNUTLS_X509_FMT_DER, tmp.data, &size);
if (ret == 0) {
tmp.size = size;
ret = gnutls_x509_crt_import(dest, &tmp, GNUTLS_X509_FMT_DER);
if (ret) {
g_warning("couldn't gnutls_x509_crt_import for real (%d %s)\n", ret, gnutls_strerror(ret));
gnutls_x509_crt_deinit(dest);
dest = NULL;
}
} else {
g_warning("couldn't gnutls_x509_crt_export for real (%d %s)\n", ret, gnutls_strerror(ret));
gnutls_x509_crt_deinit(dest);
dest = NULL;
}
free(tmp.data);
return dest;
}
#endif
static SSLCertificate *ssl_certificate_new(gnutls_x509_crt_t x509_cert, const gchar *host, gushort port)
{
SSLCertificate *cert = g_new0(SSLCertificate, 1);
size_t n;
unsigned char md[128];
if (host == NULL || x509_cert == NULL) {
ssl_certificate_destroy(cert);
return NULL;
}
cert->x509_cert = x509_crt_copy(x509_cert);
cert->status = (guint)-1;
cert->host = g_strdup(host);
cert->port = port;
/* fingerprint */
n = sizeof(md);
gnutls_x509_crt_get_fingerprint(cert->x509_cert, GNUTLS_DIG_MD5, md, &n);
cert->fingerprint = readable_fingerprint(md, (int)n);
return cert;
}
static void gnutls_export_X509_fp(FILE *fp, gnutls_x509_crt_t x509_cert, gnutls_x509_crt_fmt_t format)
{
char output[10*1024];
size_t cert_size = 10*1024;
int r;
if ((r = gnutls_x509_crt_export(x509_cert, format, output, &cert_size)) < 0) {
g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
return;
}
debug_print("writing %zd bytes\n",cert_size);
if (fwrite(&output, 1, cert_size, fp) < cert_size) {
g_warning("failed to write cert: %d %s\n", errno, g_strerror(errno));
}
}
size_t gnutls_i2d_X509(gnutls_x509_crt_t x509_cert, unsigned char **output)
{
size_t cert_size = 10*1024;
int r;
if (output == NULL)
return 0;
*output = malloc(cert_size);
if ((r = gnutls_x509_crt_export(x509_cert, GNUTLS_X509_FMT_DER, *output, &cert_size)) < 0) {
g_warning("couldn't export cert %s (%zd)\n", gnutls_strerror(r), cert_size);
free(*output);
*output = NULL;
return 0;
}
return cert_size;
}
size_t gnutls_i2d_PrivateKey(gnutls_x509_privkey_t pkey, unsigned char **output)
{
size_t key_size = 10*1024;
int r;
if (output == NULL)
return 0;
*output = malloc(key_size);
if ((r = gnutls_x509_privkey_export(pkey, GNUTLS_X509_FMT_DER, *output, &key_size)) < 0) {
g_warning("couldn't export key %s (%zd)\n", gnutls_strerror(r), key_size);
free(*output);
*output = NULL;
return 0;
}
return key_size;
}
static int gnutls_import_X509_list_fp(FILE *fp, gnutls_x509_crt_fmt_t format,
gnutls_x509_crt_t **cert_list, gint *num_certs)
{
gnutls_x509_crt_t *crt_list;
unsigned int max = 512;
unsigned int flags = 0;
gnutls_datum_t tmp;
struct stat s;
int r;
*cert_list = NULL;
*num_certs = 0;
if (fp == NULL)
return -ENOENT;
if (fstat(fileno(fp), &s) < 0) {
perror("fstat");
return -errno;
}
crt_list=(gnutls_x509_crt_t*)malloc(max*sizeof(gnutls_x509_crt_t));
tmp.data = malloc(s.st_size);
memset(tmp.data, 0, s.st_size);
tmp.size = s.st_size;
if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
perror("fread");
free(tmp.data);
free(crt_list);
return -EIO;
}
if ((r = gnutls_x509_crt_list_import(crt_list, &max,
&tmp, format, flags)) < 0) {
debug_print("cert import failed: %s\n", gnutls_strerror(r));
free(tmp.data);
free(crt_list);
return r;
}
free(tmp.data);
debug_print("got %d certs in crt_list! %p\n", max, &crt_list);
*cert_list = crt_list;
*num_certs = max;
return r;
}
/* return one certificate, read from file */
static gnutls_x509_crt_t gnutls_import_X509_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
{
gnutls_x509_crt_t *certs = NULL;
gnutls_x509_crt_t cert = NULL;
int i, ncerts, r;
if ((r = gnutls_import_X509_list_fp(fp, format, &certs, &ncerts)) < 0) {
return NULL;
}
if (ncerts == 0)
return NULL;
for (i = 1; i < ncerts; i++)
gnutls_x509_crt_deinit(certs[i]);
cert = certs[0];
free(certs);
return cert;
}
static gnutls_x509_privkey_t gnutls_import_key_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
{
gnutls_x509_privkey_t key = NULL;
gnutls_datum_t tmp;
struct stat s;
int r;
if (fstat(fileno(fp), &s) < 0) {
perror("fstat");
return NULL;
}
tmp.data = malloc(s.st_size);
memset(tmp.data, 0, s.st_size);
tmp.size = s.st_size;
if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
perror("fread");
free(tmp.data);
return NULL;
}
gnutls_x509_privkey_init(&key);
if ((r = gnutls_x509_privkey_import(key, &tmp, format)) < 0) {
debug_print("key import failed: %s\n", gnutls_strerror(r));
gnutls_x509_privkey_deinit(key);
key = NULL;
}
free(tmp.data);
debug_print("got key! %p\n", key);
return key;
}
static gnutls_pkcs12_t gnutls_import_PKCS12_fp(FILE *fp, gnutls_x509_crt_fmt_t format)
{
gnutls_pkcs12_t p12 = NULL;
gnutls_datum_t tmp;
struct stat s;
int r;
if (fstat(fileno(fp), &s) < 0) {
log_error(LOG_PROTOCOL, _("Cannot stat P12 certificate file (%s)\n"),
g_strerror(errno));
return NULL;
}
tmp.data = malloc(s.st_size);
memset(tmp.data, 0, s.st_size);
tmp.size = s.st_size;
if (fread (tmp.data, 1, s.st_size, fp) < s.st_size) {
log_error(LOG_PROTOCOL, _("Cannot read P12 certificate file (%s)\n"),
g_strerror(errno));
free(tmp.data);
return NULL;
}
gnutls_pkcs12_init(&p12);
if ((r = gnutls_pkcs12_import(p12, &tmp, format, 0)) < 0) {
log_error(LOG_PROTOCOL, _("Cannot import P12 certificate file (%s)\n"),
gnutls_strerror(r));
gnutls_pkcs12_deinit(p12);
p12 = NULL;
}
free(tmp.data);
debug_print("got p12! %p\n", p12);
return p12;
}
static void ssl_certificate_save (SSLCertificate *cert)
{
gchar *file, *port;
FILE *fp;
file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
"certs", G_DIR_SEPARATOR_S, NULL);
if (!is_dir_exist(file))
make_dir_hier(file);
g_free(file);
port = g_strdup_printf("%d", cert->port);
file = get_certificate_path(cert->host, port, cert->fingerprint);
g_free(port);
fp = g_fopen(file, "wb");
if (fp == NULL) {
g_free(file);
debug_print("Can't save certificate !\n");
return;
}
gnutls_export_X509_fp(fp, cert->x509_cert, GNUTLS_X509_FMT_DER);
g_free(file);
fclose(fp);
}
void ssl_certificate_destroy(SSLCertificate *cert)
{
if (cert == NULL)
return;
if (cert->x509_cert)
gnutls_x509_crt_deinit(cert->x509_cert);
g_free(cert->host);
g_free(cert->fingerprint);
g_free(cert);
cert = NULL;
}
void ssl_certificate_delete_from_disk(SSLCertificate *cert)
{
gchar *buf;
gchar *file;
buf = g_strdup_printf("%d", cert->port);
file = get_certificate_path(cert->host, buf, cert->fingerprint);
claws_unlink (file);
g_free(file);
file = get_certificate_chain_path(cert->host, buf, cert->fingerprint);
claws_unlink (file);
g_free(file);
g_free(buf);
}
SSLCertificate *ssl_certificate_find (const gchar *host, gushort port, const gchar *fingerprint)
{
gchar *file = NULL;
gchar *buf;
SSLCertificate *cert = NULL;
gnutls_x509_crt_t tmp_x509;
FILE *fp = NULL;
gboolean must_rename = FALSE;
buf = g_strdup_printf("%d", port);
if (fingerprint != NULL) {
file = get_certificate_path(host, buf, fingerprint);
fp = g_fopen(file, "rb");
}
if (fp == NULL) {
/* see if we have the old one */
debug_print("didn't get %s\n", file);
g_free(file);
file = get_certificate_path(host, buf, NULL);
fp = g_fopen(file, "rb");
if (fp) {
debug_print("got %s\n", file);
must_rename = (fingerprint != NULL);
}
} else {
debug_print("got %s first try\n", file);
}
if (fp == NULL) {
g_free(file);
g_free(buf);
return NULL;
}
if ((tmp_x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_DER)) != NULL) {
cert = ssl_certificate_new(tmp_x509, host, port);
debug_print("got cert %p\n", cert);
gnutls_x509_crt_deinit(tmp_x509);
}
fclose(fp);
g_free(file);
if (must_rename) {
gchar *old = get_certificate_path(host, buf, NULL);
gchar *new = get_certificate_path(host, buf, fingerprint);
if (strcmp(old, new))
move_file(old, new, TRUE);
g_free(old);
g_free(new);
}
g_free(buf);
return cert;
}
static gboolean ssl_certificate_compare (SSLCertificate *cert_a, SSLCertificate *cert_b)
{
char *output_a;
char *output_b;
size_t cert_size_a = 0, cert_size_b = 0;
int r;
if (cert_a == NULL || cert_b == NULL)
return FALSE;
if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_a))
!= GNUTLS_E_SHORT_MEMORY_BUFFER) {
g_warning("couldn't gnutls_x509_crt_export to get size a %s\n", gnutls_strerror(r));
return FALSE;
}
if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, NULL, &cert_size_b))
!= GNUTLS_E_SHORT_MEMORY_BUFFER) {
g_warning("couldn't gnutls_x509_crt_export to get size b %s\n", gnutls_strerror(r));
return FALSE;
}
output_a = g_malloc(cert_size_a);
output_b = g_malloc(cert_size_b);
if ((r = gnutls_x509_crt_export(cert_a->x509_cert, GNUTLS_X509_FMT_DER, output_a, &cert_size_a)) < 0) {
g_warning("couldn't gnutls_x509_crt_export a %s\n", gnutls_strerror(r));
g_free(output_a);
g_free(output_b);
return FALSE;
}
if ((r = gnutls_x509_crt_export(cert_b->x509_cert, GNUTLS_X509_FMT_DER, output_b, &cert_size_b)) < 0) {
g_warning("couldn't gnutls_x509_crt_export b %s\n", gnutls_strerror(r));
g_free(output_a);
g_free(output_b);
return FALSE;
}
if (cert_size_a != cert_size_b) {
g_warning("size differ %zd %zd\n", cert_size_a, cert_size_b);
g_free(output_a);
g_free(output_b);
return FALSE;
}
if (memcmp(output_a, output_b, cert_size_a)) {
g_warning("contents differ\n");
g_free(output_a);
g_free(output_b);
return FALSE;
}
g_free(output_a);
g_free(output_b);
return TRUE;
}
static guint check_cert(SSLCertificate *cert)
{
gnutls_x509_crt_t *ca_list = NULL;
gnutls_x509_crt_t *chain = NULL;
unsigned int max_ca = 512, max_certs;
unsigned int flags = 0;
int r, i;
unsigned int status;
gchar *chain_file = NULL, *buf = NULL;
FILE *fp;
if (claws_ssl_get_cert_file())
fp = g_fopen(claws_ssl_get_cert_file(), "r");
else
return (guint)-1;
if (fp == NULL)
return (guint)-1;
if ((r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &ca_list, &max_ca)) < 0) {
debug_print("CA import failed: %s\n", gnutls_strerror(r));
fclose(fp);
return (guint)-1;
}
fclose(fp);
fp = NULL;
buf = g_strdup_printf("%d", cert->port);
chain_file = get_certificate_chain_path(cert->host, buf, cert->fingerprint);
g_free(buf);
if (is_file_exist(chain_file)) {
unsigned char md[128];
size_t n;
char *fingerprint;
fp = g_fopen(chain_file, "r");
if (fp == NULL) {
debug_print("fopen %s failed: %s\n", chain_file, g_strerror(errno));
g_free(chain_file);
return (guint)-1;
}
if ((r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &chain, &max_certs)) < 0) {
debug_print("chain import failed: %s\n", gnutls_strerror(r));
fclose(fp);
g_free(chain_file);
return (guint)-1;
}
g_free(chain_file);
fclose(fp);
fp = NULL;
gnutls_x509_crt_get_fingerprint(chain[0], GNUTLS_DIG_MD5, md, &n);
fingerprint = readable_fingerprint(md, n);
if (!fingerprint || strcmp(fingerprint, cert->fingerprint)) {
debug_print("Saved chain fingerprint does not match current : %s / %s",
cert->fingerprint, fingerprint);
return (guint)-1;
}
g_free(fingerprint);
r = gnutls_x509_crt_list_verify (chain,
max_certs,
ca_list, max_ca,
NULL, 0,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
&status);
if (r < 0)
debug_print("chain check failed: %s\n", gnutls_strerror(r));
for (i = 0; i < max_certs; i++)
gnutls_x509_crt_deinit(chain[i]);
free(chain);
} else {
r = gnutls_x509_crt_verify(cert->x509_cert, ca_list, max_ca, flags, &status);
if (r < 0)
debug_print("cert check failed: %s\n", gnutls_strerror(r));
}
for (i = 0; i < max_ca; i++)
gnutls_x509_crt_deinit(ca_list[i]);
free(ca_list);
if (r < 0)
return (guint)-1;
else
return status;
}
static gboolean ssl_certificate_is_valid(SSLCertificate *cert, guint status)
{
gchar *str_status = ssl_certificate_check_signer(cert, status);
if (str_status != NULL) {
g_free(str_status);
return FALSE;
}
return ssl_certificate_check_subject_cn(cert);
}
char *ssl_certificate_check_signer (SSLCertificate *cert, guint status)
{
gnutls_x509_crt_t x509_cert = cert ? cert->x509_cert : NULL;
if (!cert)
return g_strdup(_("Internal error"));
if (status == (guint)-1) {
status = check_cert(cert);
if (status == -1)
return g_strdup(_("Uncheckable"));
}
if (status & GNUTLS_CERT_INVALID) {
if (gnutls_x509_crt_check_issuer(x509_cert, x509_cert))
return g_strdup(_("Self-signed certificate"));
}
if (status & GNUTLS_CERT_REVOKED)
return g_strdup(_("Revoked certificate"));
if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
return g_strdup(_("No certificate issuer found"));
if (status & GNUTLS_CERT_SIGNER_NOT_CA)
return g_strdup(_("Certificate issuer is not a CA"));
return NULL;
}
static void ssl_certificate_save_chain(gnutls_x509_crt_t *certs, gint len, const gchar *host, gushort port)
{
gint i;
gchar *file = NULL;
FILE *fp = NULL;
for (i = 0; i < len; i++) {
size_t n;
unsigned char md[128];
gnutls_x509_crt_t cert = certs[i];
gchar *fingerprint;
if (i == 0) {
n = sizeof(md);
gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, md, &n);
fingerprint = readable_fingerprint(md, n);
gchar *buf = g_strdup_printf("%d", port);
file = get_certificate_chain_path(host, buf, fingerprint);
g_free(buf);
fp = g_fopen(file, "wb");
if (fp == NULL) {
g_free(file);
debug_print("Can't save certificate !\n");
return;
}
g_free(file);
}
gnutls_export_X509_fp(fp, cert, GNUTLS_X509_FMT_PEM);
}
if (fp)
fclose(fp);
}
gboolean ssl_certificate_check (gnutls_x509_crt_t x509_cert, guint status,
const gchar *host, gushort port,
gboolean accept_if_valid)
{
SSLCertificate *current_cert = NULL;
SSLCertificate *known_cert;
SSLCertHookData cert_hook_data;
gchar *fingerprint;
size_t n;
unsigned char md[128];
gboolean valid = FALSE;
current_cert = ssl_certificate_new(x509_cert, host, port);
if (current_cert == NULL) {
debug_print("Buggy certificate !\n");
return FALSE;
}
current_cert->status = status;
/* fingerprint */
n = sizeof(md);
gnutls_x509_crt_get_fingerprint(x509_cert, GNUTLS_DIG_MD5, md, &n);
fingerprint = readable_fingerprint(md, n);
known_cert = ssl_certificate_find(host, port, fingerprint);
g_free(fingerprint);
if (accept_if_valid)
valid = ssl_certificate_is_valid(current_cert, status);
else
valid = FALSE; /* Force check */
if (known_cert == NULL) {
if (valid) {
ssl_certificate_save(current_cert);
ssl_certificate_destroy(current_cert);
return TRUE;
}
cert_hook_data.cert = current_cert;
cert_hook_data.old_cert = NULL;
cert_hook_data.expired = FALSE;
cert_hook_data.accept = FALSE;
hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
if (!cert_hook_data.accept) {
ssl_certificate_destroy(current_cert);
return FALSE;
} else {
ssl_certificate_save(current_cert);
ssl_certificate_destroy(current_cert);
return TRUE;
}
} else if (!ssl_certificate_compare (current_cert, known_cert)) {
if (valid) {
ssl_certificate_save(current_cert);
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return TRUE;
}
cert_hook_data.cert = current_cert;
cert_hook_data.old_cert = known_cert;
cert_hook_data.expired = FALSE;
cert_hook_data.accept = FALSE;
hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
if (!cert_hook_data.accept) {
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return FALSE;
} else {
ssl_certificate_save(current_cert);
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return TRUE;
}
} else if (gnutls_x509_crt_get_expiration_time(current_cert->x509_cert) < time(NULL)) {
gchar *tmp = g_strdup_printf("%s:%d", current_cert->host, current_cert->port);
if (warned_expired == NULL)
warned_expired = g_hash_table_new(g_str_hash, g_str_equal);
if (g_hash_table_lookup(warned_expired, tmp)) {
g_free(tmp);
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return TRUE;
}
cert_hook_data.cert = current_cert;
cert_hook_data.old_cert = NULL;
cert_hook_data.expired = TRUE;
cert_hook_data.accept = FALSE;
hooks_invoke(SSLCERT_ASK_HOOKLIST, &cert_hook_data);
if (!cert_hook_data.accept) {
g_free(tmp);
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return FALSE;
} else {
g_hash_table_insert(warned_expired, tmp, GINT_TO_POINTER(1));
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return TRUE;
}
}
ssl_certificate_destroy(current_cert);
ssl_certificate_destroy(known_cert);
return TRUE;
}
gboolean ssl_certificate_check_chain(gnutls_x509_crt_t *certs, gint chain_len,
const gchar *host, gushort port,
gboolean accept_if_valid)
{
int ncas = 0;
gnutls_x509_crt_t *cas = NULL;
gboolean result = FALSE;
int i;
gint status;
if (claws_ssl_get_cert_file()) {
FILE *fp = g_fopen(claws_ssl_get_cert_file(), "rb");
int r = -errno;
if (fp) {
r = gnutls_import_X509_list_fp(fp, GNUTLS_X509_FMT_PEM, &cas, &ncas);
fclose(fp);
}
if (r < 0)
g_warning("Can't read SSL_CERT_FILE %s: %s\n",
claws_ssl_get_cert_file(),
gnutls_strerror(r));
} else {
debug_print("Can't find SSL ca-certificates file\n");
}
gnutls_x509_crt_list_verify (certs,
chain_len,
cas, ncas,
NULL, 0,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT,
&status);
result = ssl_certificate_check(certs[0], status, host, port,
accept_if_valid);
if (result == TRUE) {
ssl_certificate_save_chain(certs, chain_len, host, port);
}
for (i = 0; i < ncas; i++)
gnutls_x509_crt_deinit(cas[i]);
free(cas);
return result;
}
gnutls_x509_crt_t ssl_certificate_get_x509_from_pem_file(const gchar *file)
{
gnutls_x509_crt_t x509 = NULL;
if (!file)
return NULL;
if (is_file_exist(file)) {
FILE *fp = g_fopen(file, "r");
if (fp) {
x509 = gnutls_import_X509_fp(fp, GNUTLS_X509_FMT_PEM);
fclose(fp);
return x509;
} else {
log_error(LOG_PROTOCOL, _("Cannot open certificate file %s: %s\n"),
file, g_strerror(errno));
}
} else {
log_error(LOG_PROTOCOL, _("Certificate file %s missing (%s)\n"),
file, g_strerror(errno));
}
return NULL;
}
gnutls_x509_privkey_t ssl_certificate_get_pkey_from_pem_file(const gchar *file)
{
gnutls_x509_privkey_t key = NULL;
if (!file)
return NULL;
if (is_file_exist(file)) {
FILE *fp = g_fopen(file, "r");
if (fp) {
key = gnutls_import_key_fp(fp, GNUTLS_X509_FMT_PEM);
fclose(fp);
return key;
} else {
log_error(LOG_PROTOCOL, _("Cannot open key file %s (%s)\n"),
file, g_strerror(errno));
}
} else {
log_error(LOG_PROTOCOL, _("Key file %s missing (%s)\n"), file,
g_strerror(errno));
}
return NULL;
}
/* From GnuTLS lib/gnutls_x509.c */
static int
parse_pkcs12 (gnutls_pkcs12_t p12,
const char *password,
gnutls_x509_privkey_t * key,
gnutls_x509_crt_t * cert)
{
gnutls_pkcs12_bag_t bag = NULL;
int index = 0;
int ret;
for (;;)
{
int elements_in_bag;
int i;
ret = gnutls_pkcs12_bag_init (&bag);
if (ret < 0)
{
bag = NULL;
goto done;
}
ret = gnutls_pkcs12_get_bag (p12, index, bag);
if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
break;
if (ret < 0)
{
goto done;
}
ret = gnutls_pkcs12_bag_get_type (bag, 0);
if (ret < 0)
{
goto done;
}
if (ret == GNUTLS_BAG_ENCRYPTED)
{
ret = gnutls_pkcs12_bag_decrypt (bag, password);
if (ret < 0)
{
goto done;
}
}
elements_in_bag = gnutls_pkcs12_bag_get_count (bag);
if (elements_in_bag < 0)
{
goto done;
}
for (i = 0; i < elements_in_bag; i++)
{
int type;
gnutls_datum_t data;
type = gnutls_pkcs12_bag_get_type (bag, i);
if (type < 0)
{
goto done;
}
ret = gnutls_pkcs12_bag_get_data (bag, i, &data);
if (ret < 0)
{
goto done;
}
switch (type)
{
case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
case GNUTLS_BAG_PKCS8_KEY:
ret = gnutls_x509_privkey_init (key);
if (ret < 0)
{
goto done;
}
ret = gnutls_x509_privkey_import_pkcs8
(*key, &data, GNUTLS_X509_FMT_DER, password,
type == GNUTLS_BAG_PKCS8_KEY ? GNUTLS_PKCS_PLAIN : 0);
if (ret < 0)
{
goto done;
}
break;
case GNUTLS_BAG_CERTIFICATE:
ret = gnutls_x509_crt_init (cert);
if (ret < 0)
{
goto done;
}
ret =
gnutls_x509_crt_import (*cert, &data, GNUTLS_X509_FMT_DER);
if (ret < 0)
{
goto done;
}
break;
case GNUTLS_BAG_ENCRYPTED:
/* XXX Bother to recurse one level down? Unlikely to
use the same password anyway. */
case GNUTLS_BAG_EMPTY:
default:
break;
}
}
index++;
gnutls_pkcs12_bag_deinit (bag);
}
ret = 0;
done:
if (bag)
gnutls_pkcs12_bag_deinit (bag);
return ret;
}
void ssl_certificate_get_x509_and_pkey_from_p12_file(const gchar *file, const gchar *password,
gnutls_x509_crt_t *x509, gnutls_x509_privkey_t *pkey)
{
gnutls_pkcs12_t p12 = NULL;
int r;
*x509 = NULL;
*pkey = NULL;
if (!file)
return;
if (is_file_exist(file)) {
FILE *fp = g_fopen(file, "r");
if (fp) {
p12 = gnutls_import_PKCS12_fp(fp, GNUTLS_X509_FMT_DER);
fclose(fp);
if (!p12) {
log_error(LOG_PROTOCOL, _("Failed to read P12 certificate file %s\n"), file);
}
} else {
log_error(LOG_PROTOCOL, _("Cannot open P12 certificate file %s (%s)\n"),
file, g_strerror(errno));
}
} else {
log_error(LOG_PROTOCOL, _("P12 Certificate file %s missing (%s)\n"), file,
g_strerror(errno));
}
if (p12 != NULL) {
if ((r = parse_pkcs12(p12, password, pkey, x509)) == 0) {
debug_print("got p12\n");
} else {
log_error(LOG_PROTOCOL, "%s\n", gnutls_strerror(r));
}
gnutls_pkcs12_deinit(p12);
}
}
gboolean ssl_certificate_check_subject_cn(SSLCertificate *cert)
{
return gnutls_x509_crt_check_hostname(cert->x509_cert, cert->host) != 0;
}
gchar *ssl_certificate_get_subject_cn(SSLCertificate *cert)
{
gchar subject_cn[BUFFSIZE];
size_t n = BUFFSIZE;
if(gnutls_x509_crt_get_dn_by_oid(cert->x509_cert,
GNUTLS_OID_X520_COMMON_NAME, 0, 0, subject_cn, &n))
return g_strdup(_("<not in certificate>"));
return g_strdup(subject_cn);
}
#endif /* USE_GNUTLS */
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