/*
- * Copyright (c) 2001-2005 Simon Wilkinson. All rights reserved.
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
#ifdef GSSAPI
+#include "includes.h"
+
#include <openssl/crypto.h>
#include <openssl/bn.h>
+#include <string.h>
+
#include "xmalloc.h"
#include "buffer.h"
-#include "bufaux.h"
+#include "ssh2.h"
+#include "key.h"
+#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
-#include "canohost.h"
-#include "ssh2.h"
+
#include "ssh-gss.h"
void
kexgss_client(Kex *kex) {
gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
- gss_buffer_desc recv_tok, gssbuf, msg_tok, *token_ptr;
+ gss_buffer_desc recv_tok, gssbuf, msg_tok, *token_ptr;
Gssctxt *ctxt;
OM_uint32 maj_status, min_status, ret_flags;
- unsigned int klen, kout;
+ u_int klen, kout, slen = 0, hashlen, strlen;
DH *dh;
BIGNUM *dh_server_pub = NULL;
BIGNUM *shared_secret = NULL;
BIGNUM *p = NULL;
BIGNUM *g = NULL;
- unsigned char *kbuf;
- unsigned char *hash;
- unsigned char *serverhostkey = NULL;
+ u_char *kbuf, *hash;
+ u_char *serverhostkey = NULL;
+ u_char *empty = "";
char *msg;
char *lang;
int type = 0;
int first = 1;
- unsigned int slen = 0;
- int gex = 0;
- int nbits = -1, min = -1, max = -1;
- u_int strlen;
+ int nbits = 0, min = DH_GRP_MIN, max = DH_GRP_MAX;
/* Initialise our GSSAPI world */
ssh_gssapi_build_ctx(&ctxt);
- if (ssh_gssapi_id_kex(ctxt, kex->name, &gex) == NULL)
+ if (ssh_gssapi_id_kex(ctxt, kex->name, kex->kex_type)
+ == GSS_C_NO_OID)
fatal("Couldn't identify host exchange");
if (ssh_gssapi_import_name(ctxt, kex->gss_host))
fatal("Couldn't import hostname");
-
- if (gex) {
+
+ if (kex->gss_client &&
+ ssh_gssapi_client_identity(ctxt, kex->gss_client))
+ fatal("Couldn't acquire client credentials");
+
+ switch (kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ dh = dh_new_group1();
+ break;
+ case KEX_GSS_GRP14_SHA1:
+ dh = dh_new_group14();
+ break;
+ case KEX_GSS_GEX_SHA1:
debug("Doing group exchange\n");
nbits = dh_estimate(kex->we_need * 8);
- min = DH_GRP_MIN;
- max = DH_GRP_MAX;
packet_start(SSH2_MSG_KEXGSS_GROUPREQ);
packet_put_int(min);
packet_put_int(nbits);
min, BN_num_bits(p), max);
dh = dh_new_group(g, p);
- } else {
- dh = dh_new_group1();
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
}
/* Step 1 - e is dh->pub_key */
min_status = packet_get_int();
msg = packet_get_string(NULL);
lang = packet_get_string(NULL);
- fatal("GSSAPI Key Exchange Error: \n%s",msg);
+ fatal("GSSAPI Error: \n%.400s",msg);
default:
packet_disconnect("Protocol error: didn't expect packet type %d",
type);
klen = DH_size(dh);
kbuf = xmalloc(klen);
kout = DH_compute_key(kbuf, dh_server_pub, dh);
+ if (kout < 0)
+ fatal("DH_compute_key: failed");
shared_secret = BN_new();
- BN_bin2bn(kbuf,kout, shared_secret);
+ if (shared_secret == NULL)
+ fatal("kexgss_client: BN_new failed");
+
+ if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
+ fatal("kexdh_client: BN_bin2bn failed");
+
memset(kbuf, 0, klen);
xfree(kbuf);
- if (gex) {
- hash = kexgex_hash( kex->client_version_string,
+ switch (kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ case KEX_GSS_GRP14_SHA1:
+ kex_dh_hash( kex->client_version_string,
kex->server_version_string,
buffer_ptr(&kex->my), buffer_len(&kex->my),
buffer_ptr(&kex->peer), buffer_len(&kex->peer),
- serverhostkey, slen,
- min, nbits, max,
- dh->p, dh->g,
- dh->pub_key,
- dh_server_pub,
- shared_secret
+ (serverhostkey ? serverhostkey : empty), slen,
+ dh->pub_key, /* e */
+ dh_server_pub, /* f */
+ shared_secret, /* K */
+ &hash, &hashlen
);
- } else {
- /* The GSS hash is identical to the DH one */
- hash = kex_dh_hash( kex->client_version_string,
+ break;
+ case KEX_GSS_GEX_SHA1:
+ kexgex_hash(
+ kex->evp_md,
+ kex->client_version_string,
kex->server_version_string,
buffer_ptr(&kex->my), buffer_len(&kex->my),
buffer_ptr(&kex->peer), buffer_len(&kex->peer),
- serverhostkey, slen, /* server host key */
- dh->pub_key, /* e */
- dh_server_pub, /* f */
- shared_secret /* K */
+ (serverhostkey ? serverhostkey : empty), slen,
+ min, nbits, max,
+ dh->p, dh->g,
+ dh->pub_key,
+ dh_server_pub,
+ shared_secret,
+ &hash, &hashlen
);
- }
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
+ }
gssbuf.value = hash;
- gssbuf.length = 20;
+ gssbuf.length = hashlen;
- /* Verify that the hash matches the MIC we just got. */
+ /* Verify that the hash matches the MIC we just got. */
if (GSS_ERROR(ssh_gssapi_checkmic(ctxt, &gssbuf, &msg_tok)))
packet_disconnect("Hash's MIC didn't verify");
/* save session id */
if (kex->session_id == NULL) {
- kex->session_id_len = 20;
+ kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
memcpy(kex->session_id, hash, kex->session_id_len);
}
+ if (kex->gss_deleg_creds)
+ ssh_gssapi_credentials_updated(ctxt);
+
if (gss_kex_context == NULL)
gss_kex_context = ctxt;
else
ssh_gssapi_delete_ctx(&ctxt);
- kex_derive_keys(kex, hash, shared_secret);
+ kex_derive_keys(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
}
andersk / gssapi-openssh.git / blobdiff