upstream commit

adapt kex to sshbuf and struct ssh; ok djm@

1 files changed, 45 insertions, 42 deletions

diff --git a/kexdh.c b/kexdh.c
index 2c1dfb6f5..feea6697d 100644
--- a/kexdh.c
+++ b/kexdh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexdh.c,v 1.24 2014/01/09 23:20:00 djm Exp $ */
+/* $OpenBSD: kexdh.c,v 1.25 2015/01/19 20:16:15 markus Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -33,58 +33,61 @@
 
 #include <openssl/evp.h>
 
-#include "buffer.h"
 #include "ssh2.h"
-#include "key.h"
+#include "sshkey.h"
 #include "cipher.h"
 #include "kex.h"
+#include "ssherr.h"
+#include "sshbuf.h"
 #include "digest.h"
-#include "log.h"
 
-void
+int
 kex_dh_hash(
-    char *client_version_string,
-    char *server_version_string,
-    char *ckexinit, int ckexinitlen,
-    char *skexinit, int skexinitlen,
-    u_char *serverhostkeyblob, int sbloblen,
-    BIGNUM *client_dh_pub,
-    BIGNUM *server_dh_pub,
-    BIGNUM *shared_secret,
-    u_char **hash, u_int *hashlen)
+    const char *client_version_string,
+    const char *server_version_string,
+    const u_char *ckexinit, size_t ckexinitlen,
+    const u_char *skexinit, size_t skexinitlen,
+    const u_char *serverhostkeyblob, size_t sbloblen,
+    const BIGNUM *client_dh_pub,
+    const BIGNUM *server_dh_pub,
+    const BIGNUM *shared_secret,
+    u_char *hash, size_t *hashlen)
 {
-        Buffer b;
-        static u_char digest[SSH_DIGEST_MAX_LENGTH];
-
-        buffer_init(&b);
-        buffer_put_cstring(&b, client_version_string);
-        buffer_put_cstring(&b, server_version_string);
-
-        /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
-        buffer_put_int(&b, ckexinitlen+1);
-        buffer_put_char(&b, SSH2_MSG_KEXINIT);
-        buffer_append(&b, ckexinit, ckexinitlen);
-        buffer_put_int(&b, skexinitlen+1);
-        buffer_put_char(&b, SSH2_MSG_KEXINIT);
-        buffer_append(&b, skexinit, skexinitlen);
-
-        buffer_put_string(&b, serverhostkeyblob, sbloblen);
-        buffer_put_bignum2(&b, client_dh_pub);
-        buffer_put_bignum2(&b, server_dh_pub);
-        buffer_put_bignum2(&b, shared_secret);
+        struct sshbuf *b;
+        int r;
 
+        if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
+                return SSH_ERR_INVALID_ARGUMENT;
+        if ((b = sshbuf_new()) == NULL)
+                return SSH_ERR_ALLOC_FAIL;
+        if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
+            (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
+            /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+            (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
+            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+            (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
+            (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
+            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+            (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
+            (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
+            (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
+            (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
+            (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
+                sshbuf_free(b);
+                return r;
+        }
 #ifdef DEBUG_KEX
-        buffer_dump(&b);
+        sshbuf_dump(b, stderr);
 #endif
-        if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, digest, sizeof(digest)) != 0)
-                fatal("%s: ssh_digest_buffer failed", __func__);
-
-        buffer_free(&b);
-
+        if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, *hashlen) != 0) {
+                sshbuf_free(b);
+                return SSH_ERR_LIBCRYPTO_ERROR;
+        }
+        sshbuf_free(b);
+        *hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
 #ifdef DEBUG_KEX
-        dump_digest("hash", digest, ssh_digest_bytes(SSH_DIGEST_SHA1));
+        dump_digest("hash", hash, *hashlen);
 #endif
-        *hash = digest;
-        *hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
+        return 0;
 }
 #endif /* WITH_OPENSSL */