Import of OpenSSH 4.0p1

[gssapi-openssh.git] / openssh / key.c

diff --git a/openssh/key.c b/openssh/key.c
index 21b0869df09a9e9f9d1b24ed240656f2bee35fd1..e419304641b10cc47cdb8082d0de4979cd9f555c 100644 (file)
--- a/openssh/key.c
+++ b/openssh/key.c
@@ -32,7 +32,7 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include "includes.h"
-RCSID("$OpenBSD: key.c,v 1.56 2004/07/28 09:40:29 markus Exp $");
+RCSID("$OpenBSD: key.c,v 1.57 2004/10/29 23:57:05 djm Exp $");
 
 #include <openssl/evp.h>
 
@@ -681,8 +681,8 @@ Key *
 key_from_blob(const u_char *blob, u_int blen)
 {
        Buffer b;
-       char *ktype;
        int rlen, type;
+       char *ktype = NULL;
        Key *key = NULL;
 
 #ifdef DEBUG_PK
@@ -690,24 +690,38 @@ key_from_blob(const u_char *blob, u_int blen)
 #endif
        buffer_init(&b);
        buffer_append(&b, blob, blen);
-       ktype = buffer_get_string(&b, NULL);
+       if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
+               error("key_from_blob: can't read key type");
+               goto out;
+       }
+
        type = key_type_from_name(ktype);
 
        switch (type) {
        case KEY_RSA:
                key = key_new(type);
-               buffer_get_bignum2(&b, key->rsa->e);
-               buffer_get_bignum2(&b, key->rsa->n);
+               if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
+                   buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
+                       error("key_from_blob: can't read rsa key");
+                       key_free(key);
+                       key = NULL;
+                       goto out;
+               }
 #ifdef DEBUG_PK
                RSA_print_fp(stderr, key->rsa, 8);
 #endif
                break;
        case KEY_DSA:
                key = key_new(type);
-               buffer_get_bignum2(&b, key->dsa->p);
-               buffer_get_bignum2(&b, key->dsa->q);
-               buffer_get_bignum2(&b, key->dsa->g);
-               buffer_get_bignum2(&b, key->dsa->pub_key);
+               if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
+                   buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
+                   buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
+                   buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
+                       error("key_from_blob: can't read dsa key");
+                       key_free(key);
+                       key = NULL;
+                       goto out;
+               }
 #ifdef DEBUG_PK
                DSA_print_fp(stderr, key->dsa, 8);
 #endif
@@ -717,12 +731,14 @@ key_from_blob(const u_char *blob, u_int blen)
                break;
        default:
                error("key_from_blob: cannot handle type %s", ktype);
-               break;
+               goto out;
        }
        rlen = buffer_len(&b);
        if (key != NULL && rlen != 0)
                error("key_from_blob: remaining bytes in key blob %d", rlen);
-       xfree(ktype);
+ out:
+       if (ktype != NULL)
+               xfree(ktype);
        buffer_free(&b);
        return key;
 }