X-Git-Url: https://the.earth.li/gitweb/?p=onak.git;a=blobdiff_plain;f=sigcheck.c;h=7732229abf75579516ea56cae281f7526bede028;hp=fc046266248df3d8dd98d6f127758a1c6d163189;hb=adc800dbc424a1e246dd4a82a0c2e88eeda25531;hpb=4c8bebffd4bc105ebaa09256b7a57f4a6201bd52
diff --git a/sigcheck.c b/sigcheck.c
index fc04626..7732229 100644
--- a/sigcheck.c
+++ b/sigcheck.c
@@ -13,13 +13,14 @@
* 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 02110-1301, USA.
+ * this program. If not, see .
*/
#include
#include "config.h"
+#include "decodekey.h"
+#include "keyid.h"
#include "keystructs.h"
#include "log.h"
#include "openpgp.h"
@@ -27,11 +28,13 @@
#ifdef HAVE_NETTLE
#include
+#include
#include
#else
#include "md5.h"
#include "sha1.h"
#endif
+#include "sha1x.h"
int check_packet_sighash(struct openpgp_publickey *key,
struct openpgp_packet *packet,
@@ -41,7 +44,11 @@ int check_packet_sighash(struct openpgp_publickey *key,
uint8_t *sighash;
size_t siglen, unhashedlen;
struct sha1_ctx sha1_context;
+ struct sha1x_ctx sha1x_context;
struct md5_ctx md5_context;
+#ifdef NETTLE_WITH_RIPEMD160
+ struct ripemd160_ctx ripemd160_context;
+#endif
#ifdef NETTLE_WITH_SHA224
struct sha224_ctx sha224_context;
#endif
@@ -57,10 +64,12 @@ int check_packet_sighash(struct openpgp_publickey *key,
uint8_t keyheader[3];
uint8_t packetheader[5];
uint8_t v4trailer[6];
- uint8_t hash[20];
+ uint8_t hash[64];
uint8_t *hashdata[8];
size_t hashlen[8];
int chunks, i;
+ uint64_t keyid;
+ onak_status_t res;
keyheader[0] = 0x99;
keyheader[1] = key->publickey->length >> 8;
@@ -100,6 +109,38 @@ int check_packet_sighash(struct openpgp_publickey *key,
case 4:
hashtype = sig->data[3];
+ /* Check to see if this is an X509 based signature */
+ if (sig->data[2] == 0 || sig->data[2] == 100) {
+ size_t len;
+
+ keyid = 0;
+ res = parse_subpackets(&sig->data[4],
+ sig->length - 4, &len,
+ &keyid, NULL);
+ if (res != ONAK_E_OK) {
+ /* If it parses badly, reject it */
+ return 0;
+ }
+ if (keyid == 0 &&
+ /* No unhashed data */
+ sig->data[4 + len] == 0 &&
+ sig->data[5 + len] == 0 &&
+ /* Dummy 0 checksum */
+ sig->data[6 + len] == 0 &&
+ sig->data[7 + len] == 0 &&
+ /* Dummy MPI of 1 */
+ sig->data[8 + len] == 0 &&
+ sig->data[9 + len] == 1 &&
+ sig->data[10 + len] == 1) {
+ get_keyid(key, &keyid);
+ logthing(LOGTHING_DEBUG,
+ "Skipping X509 signature on 0x%016"
+ PRIX64,
+ keyid);
+ return -1;
+ }
+ }
+
if (packet != NULL) {
if (packet->tag == OPENPGP_PACKET_PUBLICSUBKEY) {
packetheader[0] = 0x99;
@@ -128,6 +169,10 @@ int check_packet_sighash(struct openpgp_publickey *key,
hashdata[chunks] = sig->data;
hashlen[chunks] = siglen = (sig->data[4] << 8) +
sig->data[5] + 6;;
+ if (siglen > sig->length) {
+ /* Signature data exceed packet length, bogus */
+ return 0;
+ }
chunks++;
v4trailer[0] = 4;
@@ -145,8 +190,10 @@ int check_packet_sighash(struct openpgp_publickey *key,
sighash = &sig->data[siglen + unhashedlen + 2];
break;
default:
- logthing(LOGTHING_ERROR, "Unknown signature version %d",
- sig->data[0]);
+ get_keyid(key, &keyid);
+ logthing(LOGTHING_ERROR,
+ "Unknown signature version %d on 0x%016" PRIX64,
+ sig->data[0], keyid);
return -1;
}
@@ -165,6 +212,27 @@ int check_packet_sighash(struct openpgp_publickey *key,
}
sha1_digest(&sha1_context, 20, hash);
break;
+ case OPENPGP_HASH_RIPEMD160:
+#ifdef NETTLE_WITH_RIPEMD160
+ ripemd160_init(&ripemd160_context);
+ for (i = 0; i < chunks; i++) {
+ ripemd160_update(&ripemd160_context, hashlen[i],
+ hashdata[i]);
+ }
+ ripemd160_digest(&ripemd160_context, RIPEMD160_DIGEST_SIZE,
+ hash);
+ break;
+#else
+ logthing(LOGTHING_INFO, "RIPEMD160 support not available.");
+ return -1;
+#endif
+ case OPENPGP_HASH_SHA1X:
+ sha1x_init(&sha1x_context);
+ for (i = 0; i < chunks; i++) {
+ sha1x_update(&sha1x_context, hashlen[i], hashdata[i]);
+ }
+ sha1x_digest(&sha1x_context, 20, hash);
+ break;
case OPENPGP_HASH_SHA224:
#ifdef NETTLE_WITH_SHA224
sha224_init(&sha224_context);
@@ -173,10 +241,11 @@ int check_packet_sighash(struct openpgp_publickey *key,
hashdata[i]);
}
sha224_digest(&sha224_context, SHA224_DIGEST_SIZE, hash);
+ break;
#else
logthing(LOGTHING_INFO, "SHA224 support not available.");
+ return -1;
#endif
- break;
case OPENPGP_HASH_SHA256:
#ifdef NETTLE_WITH_SHA256
sha256_init(&sha256_context);
@@ -185,10 +254,11 @@ int check_packet_sighash(struct openpgp_publickey *key,
hashdata[i]);
}
sha256_digest(&sha256_context, SHA256_DIGEST_SIZE, hash);
+ break;
#else
logthing(LOGTHING_INFO, "SHA256 support not available.");
+ return -1;
#endif
- break;
case OPENPGP_HASH_SHA384:
#ifdef NETTLE_WITH_SHA384
sha384_init(&sha384_context);
@@ -197,10 +267,11 @@ int check_packet_sighash(struct openpgp_publickey *key,
hashdata[i]);
}
sha384_digest(&sha384_context, SHA384_DIGEST_SIZE, hash);
+ break;
#else
logthing(LOGTHING_INFO, "SHA384 support not available.");
+ return -1;
#endif
- break;
case OPENPGP_HASH_SHA512:
#ifdef NETTLE_WITH_SHA512
sha512_init(&sha512_context);
@@ -209,18 +280,22 @@ int check_packet_sighash(struct openpgp_publickey *key,
hashdata[i]);
}
sha512_digest(&sha512_context, SHA512_DIGEST_SIZE, hash);
+ break;
#else
logthing(LOGTHING_INFO, "SHA512 support not available.");
+ return -1;
#endif
- break;
default:
- logthing(LOGTHING_ERROR, "Unsupported signature hash type %d",
- hashtype);
+ get_keyid(key, &keyid);
+ logthing(LOGTHING_ERROR,
+ "Unsupported signature hash type %d on 0x%016" PRIX64,
+ hashtype,
+ keyid);
return -1;
}
logthing(LOGTHING_DEBUG, "Hash type: %d, %d chunks, "
- "calculated: %02X%02X / actual: %02X%02X\n",
+ "calculated: %02X%02X / actual: %02X%02X",
hashtype, chunks,
hash[0], hash[1], sighash[0], sighash[1]);