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gnutls: Prevent CA files from being loaded twice if possible

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This commit is contained in:
Tim Ruehsen 2013-08-09 21:56:01 +02:00 committed by Giuseppe Scrivano
parent a12bd59111
commit 695f11304b
2 changed files with 98 additions and 57 deletions
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7
src/ChangeLog
View File

@ -1,3 +1,10 @@
2013-08-09 Tim Ruehsen <tim.ruehsen@gmx.de>
* gnutls.c (ssl_init): Prevent CA files from being loaded twice
if possible.
* gnutls.c (ssl_check_certificate): Added some error messages
* gnutls.c: Fixed some compiler warnings
2013-08-08 Will Dietz <w@wdtz.org> (tiny change):
* main.c (format_and_print_line): Wrap correctly long tokens.

148
src/gnutls.c
View File

@ -46,6 +46,7 @@ as that of the covered work. */
#include "connect.h"
#include "url.h"
#include "ptimer.h"
#include "hash.h"
#include "ssl.h"
#include <sys/fcntl.h>
@ -81,49 +82,76 @@ ssl_init (void)
{
/* Becomes true if GnuTLS is initialized. */
static bool ssl_initialized = false;
const char *ca_directory;
DIR *dir;
int ncerts = -1;
/* GnuTLS should be initialized only once. */
if (ssl_initialized)
return true;
const char *ca_directory;
DIR *dir;
gnutls_global_init ();
gnutls_certificate_allocate_credentials (&credentials);
gnutls_certificate_set_verify_flags(credentials,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
gnutls_certificate_set_verify_flags (credentials,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
ca_directory = opt.ca_directory ? opt.ca_directory : "/etc/ssl/certs";
#if GNUTLS_VERSION_MAJOR >= 3
if (!opt.ca_directory)
ncerts = gnutls_certificate_set_x509_system_trust (credentials);
#endif
dir = opendir (ca_directory);
if (dir == NULL)
/* If GnuTLS version is too old or CA loading failed, fallback to old behaviour.
* Also use old behaviour if the CA directory is user-provided. */
if (ncerts <= 0)
{
if (opt.ca_directory && *opt.ca_directory)
logprintf (LOG_NOTQUIET, _("ERROR: Cannot open directory %s.\n"),
opt.ca_directory);
}
else
{
struct dirent *dent;
while ((dent = readdir (dir)) != NULL)
ca_directory = opt.ca_directory ? opt.ca_directory : "/etc/ssl/certs";
if ((dir = opendir (ca_directory)) == NULL)
{
struct stat st;
char *ca_file;
asprintf (&ca_file, "%s/%s", ca_directory, dent->d_name);
stat (ca_file, &st);
if (S_ISREG (st.st_mode))
gnutls_certificate_set_x509_trust_file (credentials, ca_file,
GNUTLS_X509_FMT_PEM);
free (ca_file);
if (opt.ca_directory && *opt.ca_directory)
logprintf (LOG_NOTQUIET, _("ERROR: Cannot open directory %s.\n"),
opt.ca_directory);
}
else
{
struct hash_table *inode_map = hash_table_new (196, NULL, NULL);
struct dirent *dent;
size_t dirlen = strlen(ca_directory);
int rc;
closedir (dir);
ncerts = 0;
while ((dent = readdir (dir)) != NULL)
{
struct stat st;
char ca_file[dirlen + strlen(dent->d_name) + 2];
snprintf (ca_file, sizeof(ca_file), "%s/%s", ca_directory, dent->d_name);
if (stat (ca_file, &st) != 0)
continue;
if (! S_ISREG (st.st_mode))
continue;
/* avoid loading the same file twice by checking the inode. */
if (hash_table_contains (inode_map, (void *)(intptr_t) st.st_ino))
continue;
hash_table_put (inode_map, (void *)(intptr_t) st.st_ino, NULL);
if ((rc = gnutls_certificate_set_x509_trust_file (credentials, ca_file,
GNUTLS_X509_FMT_PEM)) <= 0)
logprintf (LOG_NOTQUIET, _("ERROR: Failed to open cert %s: (%d).\n"),
ca_file, rc);
else
ncerts += rc;
}
hash_table_destroy (inode_map);
closedir (dir);
}
}
DEBUGP (("Certificates loaded: %d\n", ncerts));
/* Use the private key from the cert file unless otherwise specified. */
if (opt.cert_file && !opt.private_key)
{
@ -141,17 +169,17 @@ ssl_init (void)
{
int type;
if (opt.private_key_type != opt.cert_type)
{
/* GnuTLS can't handle this */
logprintf (LOG_NOTQUIET, _("ERROR: GnuTLS requires the key and the \
{
/* GnuTLS can't handle this */
logprintf (LOG_NOTQUIET, _("ERROR: GnuTLS requires the key and the \
cert to be of the same type.\n"));
}
}
type = key_type_to_gnutls_type (opt.private_key_type);
gnutls_certificate_set_x509_key_file (credentials, opt.cert_file,
opt.private_key,
type);
opt.private_key,
type);
}
if (opt.ca_cert)
@ -278,7 +306,7 @@ wgnutls_read (int fd, char *buf, int bufsize, void *arg)
}
static int
wgnutls_write (int fd, char *buf, int bufsize, void *arg)
wgnutls_write (int fd _GL_UNUSED, char *buf, int bufsize, void *arg)
{
int ret;
struct wgnutls_transport_context *ctx = arg;
@ -315,7 +343,7 @@ wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
return offset;
}
if (bufsize > sizeof ctx->peekbuf)
if (bufsize > (int) sizeof ctx->peekbuf)
bufsize = sizeof ctx->peekbuf;
if (bufsize > offset)
@ -346,7 +374,7 @@ wgnutls_peek (int fd, char *buf, int bufsize, void *arg)
}
static const char *
wgnutls_errstr (int fd, void *arg)
wgnutls_errstr (int fd _GL_UNUSED, void *arg)
{
struct wgnutls_transport_context *ctx = arg;
return gnutls_strerror (ctx->last_error);
@ -387,7 +415,7 @@ ssl_connect_wget (int fd, const char *hostname)
if (! is_valid_ip_address (hostname))
{
gnutls_server_name_set (session, GNUTLS_NAME_DNS, hostname,
strlen (hostname));
strlen (hostname));
}
gnutls_set_default_priority (session);
@ -395,7 +423,11 @@ ssl_connect_wget (int fd, const char *hostname)
#ifndef FD_TO_SOCKET
# define FD_TO_SOCKET(X) (X)
#endif
#ifdef HAVE_INTPTR_T
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) (intptr_t) FD_TO_SOCKET (fd));
#else
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) FD_TO_SOCKET (fd));
#endif
err = 0;
#if HAVE_GNUTLS_PRIORITY_SET_DIRECT
@ -531,6 +563,14 @@ ssl_connect_wget (int fd, const char *hostname)
return true;
}
#define _CHECK_CERT(flag,msg) \
if (status & (flag))\
{\
logprintf (LOG_NOTQUIET, (msg),\
severity, quote (host));\
success = false;\
}
bool
ssl_check_certificate (int fd, const char *host)
{
@ -553,24 +593,13 @@ ssl_check_certificate (int fd, const char *host)
goto out;
}
if (status & GNUTLS_CERT_INVALID)
{
logprintf (LOG_NOTQUIET, _("%s: The certificate of %s is not trusted.\n"),
severity, quote (host));
success = false;
}
if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
{
logprintf (LOG_NOTQUIET, _("%s: The certificate of %s hasn't got a known issuer.\n"),
severity, quote (host));
success = false;
}
if (status & GNUTLS_CERT_REVOKED)
{
logprintf (LOG_NOTQUIET, _("%s: The certificate of %s has been revoked.\n"),
severity, quote (host));
success = false;
}
_CHECK_CERT (GNUTLS_CERT_INVALID, _("%s: The certificate of %s is not trusted.\n"));
_CHECK_CERT (GNUTLS_CERT_SIGNER_NOT_FOUND, _("%s: The certificate of %s hasn't got a known issuer.\n"));
_CHECK_CERT (GNUTLS_CERT_REVOKED, _("%s: The certificate of %s has been revoked.\n"));
_CHECK_CERT (GNUTLS_CERT_SIGNER_NOT_CA, _("%s: The certificate signer of %s was not a CA.\n"));
_CHECK_CERT (GNUTLS_CERT_INSECURE_ALGORITHM, _("%s: The certificate of %s was signed using an insecure algorithm.\n"));
_CHECK_CERT (GNUTLS_CERT_NOT_ACTIVATED, _("%s: The certificate of %s is not yet activated.\n"));
_CHECK_CERT (GNUTLS_CERT_EXPIRED, _("%s: The certificate of %s has expired.\n"));
if (gnutls_certificate_type_get (ctx->session) == GNUTLS_CRT_X509)
{
@ -621,7 +650,12 @@ ssl_check_certificate (int fd, const char *host)
}
crt_deinit:
gnutls_x509_crt_deinit (cert);
}
}
else
{
logprintf (LOG_NOTQUIET, _("Certificate must be X.509\n"));
success = false;
}
out:
return opt.check_cert ? success : true;