Import of OpenSSH 4.2p1

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

diff --git a/openssh/kex.c b/openssh/kex.c
index a668346c393411efac7a27978ff029e4a194bb83..5dce335fe5f11d1fe3533425544a5760263011ef 100644 (file)
--- a/openssh/kex.c
+++ b/openssh/kex.c
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: kex.c,v 1.60 2004/06/21 17:36:31 avsm Exp $");
+RCSID("$OpenBSD: kex.c,v 1.64 2005/07/25 11:59:39 markus Exp $");
 
 #include <openssl/crypto.h>
 
@@ -52,7 +52,7 @@ static void kex_choose_conf(Kex *);
 static void
 kex_prop2buf(Buffer *b, char *proposal[PROPOSAL_MAX])
 {
-       int i;
+       u_int i;
 
        buffer_clear(b);
        /*
@@ -101,7 +101,7 @@ kex_buf2prop(Buffer *raw, int *first_kex_follows)
 static void
 kex_prop_free(char **proposal)
 {
-       int i;
+       u_int i;
 
        for (i = 0; i < PROPOSAL_MAX; i++)
                xfree(proposal[i]);
@@ -150,7 +150,7 @@ kex_send_kexinit(Kex *kex)
 {
        u_int32_t rnd = 0;
        u_char *cookie;
-       int i;
+       u_int i;
 
        if (kex == NULL) {
                error("kex_send_kexinit: no kex, cannot rekey");
@@ -183,8 +183,7 @@ void
 kex_input_kexinit(int type, u_int32_t seq, void *ctxt)
 {
        char *ptr;
-       int dlen;
-       int i;
+       u_int i, dlen;
        Kex *kex = (Kex *)ctxt;
 
        debug("SSH2_MSG_KEXINIT received");
@@ -276,10 +275,12 @@ choose_comp(Comp *comp, char *client, char *server)
        char *name = match_list(client, server, NULL);
        if (name == NULL)
                fatal("no matching comp found: client %s server %s", client, server);
-       if (strcmp(name, "zlib") == 0) {
-               comp->type = 1;
+       if (strcmp(name, "zlib@openssh.com") == 0) {
+               comp->type = COMP_DELAYED;
+       } else if (strcmp(name, "zlib") == 0) {
+               comp->type = COMP_ZLIB;
        } else if (strcmp(name, "none") == 0) {
-               comp->type = 0;
+               comp->type = COMP_NONE;
        } else {
                fatal("unsupported comp %s", name);
        }
@@ -343,9 +344,7 @@ kex_choose_conf(Kex *kex)
        char **my, **peer;
        char **cprop, **sprop;
        int nenc, nmac, ncomp;
-       int mode;
-       int ctos;                               /* direction: if true client-to-server */
-       int need;
+       u_int mode, ctos, need;
        int first_kex_follows, type;
 
        my   = kex_buf2prop(&kex->my, NULL);
@@ -395,7 +394,7 @@ kex_choose_conf(Kex *kex)
 
        /* ignore the next message if the proposals do not match */
        if (first_kex_follows && !proposals_match(my, peer) &&
-          !(datafellows & SSH_BUG_FIRSTKEX)) {
+           !(datafellows & SSH_BUG_FIRSTKEX)) {
                type = packet_read();
                debug2("skipping next packet (type %u)", type);
        }
@@ -405,15 +404,19 @@ kex_choose_conf(Kex *kex)
 }
 
 static u_char *
-derive_key(Kex *kex, int id, int need, u_char *hash, BIGNUM *shared_secret)
+derive_key(Kex *kex, int id, u_int need, u_char *hash, BIGNUM *shared_secret)
 {
        Buffer b;
        const EVP_MD *evp_md = EVP_sha1();
        EVP_MD_CTX md;
        char c = id;
-       int have;
+       u_int have;
        int mdsz = EVP_MD_size(evp_md);
-       u_char *digest = xmalloc(roundup(need, mdsz));
+       u_char *digest;
+
+       if (mdsz < 0)
+               fatal("derive_key: mdsz < 0");
+       digest = xmalloc(roundup(need, mdsz));
 
        buffer_init(&b);
        buffer_put_bignum2(&b, shared_secret);
@@ -455,7 +458,7 @@ void
 kex_derive_keys(Kex *kex, u_char *hash, BIGNUM *shared_secret)
 {
        u_char *keys[NKEYS];
-       int i, mode, ctos;
+       u_int i, mode, ctos;
 
        for (i = 0; i < NKEYS; i++)
                keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, shared_secret);
@@ -493,13 +496,13 @@ derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus,
        EVP_DigestInit(&md, evp_md);
 
        len = BN_num_bytes(host_modulus);
-       if (len < (512 / 8) || len > sizeof(nbuf))
+       if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
                fatal("%s: bad host modulus (len %d)", __func__, len);
        BN_bn2bin(host_modulus, nbuf);
        EVP_DigestUpdate(&md, nbuf, len);
 
        len = BN_num_bytes(server_modulus);
-       if (len < (512 / 8) || len > sizeof(nbuf))
+       if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
                fatal("%s: bad server modulus (len %d)", __func__, len);
        BN_bn2bin(server_modulus, nbuf);
        EVP_DigestUpdate(&md, nbuf, len);
@@ -518,7 +521,7 @@ derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus,
 void
 dump_digest(char *msg, u_char *digest, int len)
 {
-       int i;
+       u_int i;
 
        fprintf(stderr, "%s\n", msg);
        for (i = 0; i< len; i++) {