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-rw-r--r--sshconnect2.c461
1 files changed, 381 insertions, 80 deletions
diff --git a/sshconnect2.c b/sshconnect2.c
index eee09a19..ca459f62 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -23,7 +23,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect2.c,v 1.21 2000/09/27 21:41:34 markus Exp $");
+RCSID("$OpenBSD: sshconnect2.c,v 1.25 2000/10/12 09:59:19 markus Exp $");
#include <openssl/bn.h>
#include <openssl/rsa.h>
@@ -37,7 +37,6 @@ RCSID("$OpenBSD: sshconnect2.c,v 1.21 2000/09/27 21:41:34 markus Exp $");
#include "rsa.h"
#include "buffer.h"
#include "packet.h"
-#include "cipher.h"
#include "uidswap.h"
#include "compat.h"
#include "readconf.h"
@@ -49,9 +48,13 @@ RCSID("$OpenBSD: sshconnect2.c,v 1.21 2000/09/27 21:41:34 markus Exp $");
#include "dsa.h"
#include "sshconnect.h"
#include "authfile.h"
+#include "cli.h"
#include "dispatch.h"
#include "authfd.h"
+void ssh_dh1_client(Kex *, char *, struct sockaddr *, Buffer *, Buffer *);
+void ssh_dhgex_client(Kex *, char *, struct sockaddr *, Buffer *, Buffer *);
+
/* import */
extern char *client_version_string;
extern char *server_version_string;
@@ -65,8 +68,90 @@ unsigned char *session_id2 = NULL;
int session_id2_len = 0;
void
-ssh_kex_dh(Kex *kex, char *host, struct sockaddr *hostaddr,
- Buffer *client_kexinit, Buffer *server_kexinit)
+ssh_kex2(char *host, struct sockaddr *hostaddr)
+{
+ int i, plen;
+ Kex *kex;
+ Buffer *client_kexinit, *server_kexinit;
+ char *sprop[PROPOSAL_MAX];
+
+ if (options.ciphers == NULL) {
+ if (options.cipher == SSH_CIPHER_3DES) {
+ options.ciphers = "3des-cbc";
+ } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
+ options.ciphers = "blowfish-cbc";
+ } else if (options.cipher == SSH_CIPHER_DES) {
+ fatal("cipher DES not supported for protocol version 2");
+ }
+ }
+ if (options.ciphers != NULL) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
+ }
+ if (options.compression) {
+ myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
+ } else {
+ myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
+ }
+
+ /* buffers with raw kexinit messages */
+ server_kexinit = xmalloc(sizeof(*server_kexinit));
+ buffer_init(server_kexinit);
+ client_kexinit = kex_init(myproposal);
+
+ /* algorithm negotiation */
+ kex_exchange_kexinit(client_kexinit, server_kexinit, sprop);
+ kex = kex_choose_conf(myproposal, sprop, 0);
+ for (i = 0; i < PROPOSAL_MAX; i++)
+ xfree(sprop[i]);
+
+ /* server authentication and session key agreement */
+ switch(kex->kex_type) {
+ case DH_GRP1_SHA1:
+ ssh_dh1_client(kex, host, hostaddr,
+ client_kexinit, server_kexinit);
+ break;
+ case DH_GEX_SHA1:
+ ssh_dhgex_client(kex, host, hostaddr, client_kexinit,
+ server_kexinit);
+ break;
+ default:
+ fatal("Unsupported key exchange %d", kex->kex_type);
+ }
+
+ buffer_free(client_kexinit);
+ buffer_free(server_kexinit);
+ xfree(client_kexinit);
+ xfree(server_kexinit);
+
+ debug("Wait SSH2_MSG_NEWKEYS.");
+ packet_read_expect(&plen, SSH2_MSG_NEWKEYS);
+ packet_done();
+ debug("GOT SSH2_MSG_NEWKEYS.");
+
+ debug("send SSH2_MSG_NEWKEYS.");
+ packet_start(SSH2_MSG_NEWKEYS);
+ packet_send();
+ packet_write_wait();
+ debug("done: send SSH2_MSG_NEWKEYS.");
+
+#ifdef DEBUG_KEXDH
+ /* send 1st encrypted/maced/compressed message */
+ packet_start(SSH2_MSG_IGNORE);
+ packet_put_cstring("markus");
+ packet_send();
+ packet_write_wait();
+#endif
+ debug("done: KEX2.");
+}
+
+/* diffie-hellman-group1-sha1 */
+
+void
+ssh_dh1_client(Kex *kex, char *host, struct sockaddr *hostaddr,
+ Buffer *client_kexinit, Buffer *server_kexinit)
{
#ifdef DEBUG_KEXDH
int i;
@@ -116,7 +201,7 @@ ssh_kex_dh(Kex *kex, char *host, struct sockaddr *hostaddr,
fatal("cannot decode server_host_key_blob");
check_host_key(host, hostaddr, server_host_key,
- options.user_hostfile2, options.system_hostfile2);
+ options.user_hostfile2, options.system_hostfile2);
/* DH paramter f, server public DH key */
dh_server_pub = BN_new();
@@ -186,72 +271,175 @@ ssh_kex_dh(Kex *kex, char *host, struct sockaddr *hostaddr,
memcpy(session_id2, hash, session_id2_len);
}
+/* diffie-hellman-group-exchange-sha1 */
+
+/*
+ * Estimates the group order for a Diffie-Hellman group that has an
+ * attack complexity approximately the same as O(2**bits). Estimate
+ * with: O(exp(1.9223 * (ln q)^(1/3) (ln ln q)^(2/3)))
+ */
+
+int
+dh_estimate(int bits)
+{
+
+ if (bits < 64)
+ return (512); /* O(2**63) */
+ if (bits < 128)
+ return (1024); /* O(2**86) */
+ if (bits < 192)
+ return (2048); /* O(2**116) */
+ return (4096); /* O(2**156) */
+}
+
void
-ssh_kex2(char *host, struct sockaddr *hostaddr)
+ssh_dhgex_client(Kex *kex, char *host, struct sockaddr *hostaddr,
+ Buffer *client_kexinit, Buffer *server_kexinit)
{
- int i, plen;
- Kex *kex;
- Buffer *client_kexinit, *server_kexinit;
- char *sprop[PROPOSAL_MAX];
+#ifdef DEBUG_KEXDH
+ int i;
+#endif
+ int plen, dlen;
+ unsigned int klen, kout;
+ char *signature = NULL;
+ unsigned int slen, nbits;
+ char *server_host_key_blob = NULL;
+ Key *server_host_key;
+ unsigned int sbloblen;
+ DH *dh;
+ BIGNUM *dh_server_pub = 0;
+ BIGNUM *shared_secret = 0;
+ BIGNUM *p = 0, *g = 0;
+ unsigned char *kbuf;
+ unsigned char *hash;
- if (options.ciphers != NULL) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
- } else if (options.cipher == SSH_CIPHER_3DES) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] =
- (char *) cipher_name(SSH_CIPHER_3DES_CBC);
- } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
- myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- myproposal[PROPOSAL_ENC_ALGS_STOC] =
- (char *) cipher_name(SSH_CIPHER_BLOWFISH_CBC);
- }
- if (options.compression) {
- myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
- } else {
- myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
- }
+ nbits = dh_estimate(kex->enc[MODE_OUT].cipher->key_len * 8);
- /* buffers with raw kexinit messages */
- server_kexinit = xmalloc(sizeof(*server_kexinit));
- buffer_init(server_kexinit);
- client_kexinit = kex_init(myproposal);
+ debug("Sending SSH2_MSG_KEX_DH_GEX_REQUEST.");
+ packet_start(SSH2_MSG_KEX_DH_GEX_REQUEST);
+ packet_put_int(nbits);
+ packet_send();
+ packet_write_wait();
- /* algorithm negotiation */
- kex_exchange_kexinit(client_kexinit, server_kexinit, sprop);
- kex = kex_choose_conf(myproposal, sprop, 0);
- for (i = 0; i < PROPOSAL_MAX; i++)
- xfree(sprop[i]);
+#ifdef DEBUG_KEXDH
+ fprintf(stderr, "\nnbits = %d", nbits);
+#endif
- /* server authentication and session key agreement */
- ssh_kex_dh(kex, host, hostaddr, client_kexinit, server_kexinit);
+ debug("Wait SSH2_MSG_KEX_DH_GEX_GROUP.");
- buffer_free(client_kexinit);
- buffer_free(server_kexinit);
- xfree(client_kexinit);
- xfree(server_kexinit);
+ packet_read_expect(&plen, SSH2_MSG_KEX_DH_GEX_GROUP);
- debug("Wait SSH2_MSG_NEWKEYS.");
- packet_read_expect(&plen, SSH2_MSG_NEWKEYS);
- packet_done();
- debug("GOT SSH2_MSG_NEWKEYS.");
+ debug("Got SSH2_MSG_KEX_DH_GEX_GROUP.");
- debug("send SSH2_MSG_NEWKEYS.");
- packet_start(SSH2_MSG_NEWKEYS);
- packet_send();
- packet_write_wait();
- debug("done: send SSH2_MSG_NEWKEYS.");
+ if ((p = BN_new()) == NULL)
+ fatal("BN_new");
+ packet_get_bignum2(p, &dlen);
+ if ((g = BN_new()) == NULL)
+ fatal("BN_new");
+ packet_get_bignum2(g, &dlen);
+ if ((dh = dh_new_group(g, p)) == NULL)
+ fatal("dh_new_group");
#ifdef DEBUG_KEXDH
- /* send 1st encrypted/maced/compressed message */
- packet_start(SSH2_MSG_IGNORE);
- packet_put_cstring("markus");
+ fprintf(stderr, "\np= ");
+ BN_print_fp(stderr, dh->p);
+ fprintf(stderr, "\ng= ");
+ BN_print_fp(stderr, dh->g);
+ fprintf(stderr, "\npub= ");
+ BN_print_fp(stderr, dh->pub_key);
+ fprintf(stderr, "\n");
+ DHparams_print_fp(stderr, dh);
+#endif
+
+ debug("Sending SSH2_MSG_KEX_DH_GEX_INIT.");
+ /* generate and send 'e', client DH public key */
+ packet_start(SSH2_MSG_KEX_DH_GEX_INIT);
+ packet_put_bignum2(dh->pub_key);
packet_send();
packet_write_wait();
+
+ debug("Wait SSH2_MSG_KEX_DH_GEX_REPLY.");
+
+ packet_read_expect(&plen, SSH2_MSG_KEX_DH_GEX_REPLY);
+
+ debug("Got SSH2_MSG_KEXDH_REPLY.");
+
+ /* key, cert */
+ server_host_key_blob = packet_get_string(&sbloblen);
+ server_host_key = dsa_key_from_blob(server_host_key_blob, sbloblen);
+ if (server_host_key == NULL)
+ fatal("cannot decode server_host_key_blob");
+
+ check_host_key(host, hostaddr, server_host_key,
+ options.user_hostfile2, options.system_hostfile2);
+
+ /* DH paramter f, server public DH key */
+ dh_server_pub = BN_new();
+ if (dh_server_pub == NULL)
+ fatal("dh_server_pub == NULL");
+ packet_get_bignum2(dh_server_pub, &dlen);
+
+#ifdef DEBUG_KEXDH
+ fprintf(stderr, "\ndh_server_pub= ");
+ BN_print_fp(stderr, dh_server_pub);
+ fprintf(stderr, "\n");
+ debug("bits %d", BN_num_bits(dh_server_pub));
#endif
- debug("done: KEX2.");
+
+ /* signed H */
+ signature = packet_get_string(&slen);
+ packet_done();
+
+ if (!dh_pub_is_valid(dh, dh_server_pub))
+ packet_disconnect("bad server public DH value");
+
+ klen = DH_size(dh);
+ kbuf = xmalloc(klen);
+ kout = DH_compute_key(kbuf, dh_server_pub, dh);
+#ifdef DEBUG_KEXDH
+ debug("shared secret: len %d/%d", klen, kout);
+ fprintf(stderr, "shared secret == ");
+ for (i = 0; i< kout; i++)
+ fprintf(stderr, "%02x", (kbuf[i])&0xff);
+ fprintf(stderr, "\n");
+#endif
+ shared_secret = BN_new();
+
+ BN_bin2bn(kbuf, kout, shared_secret);
+ memset(kbuf, 0, klen);
+ xfree(kbuf);
+
+ /* calc and verify H */
+ hash = kex_hash_gex(
+ client_version_string,
+ server_version_string,
+ buffer_ptr(client_kexinit), buffer_len(client_kexinit),
+ buffer_ptr(server_kexinit), buffer_len(server_kexinit),
+ server_host_key_blob, sbloblen,
+ nbits, dh->p, dh->g,
+ dh->pub_key,
+ dh_server_pub,
+ shared_secret
+ );
+ xfree(server_host_key_blob);
+ DH_free(dh);
+#ifdef DEBUG_KEXDH
+ fprintf(stderr, "hash == ");
+ for (i = 0; i< 20; i++)
+ fprintf(stderr, "%02x", (hash[i])&0xff);
+ fprintf(stderr, "\n");
+#endif
+ if (dsa_verify(server_host_key, (unsigned char *)signature, slen, hash, 20) != 1)
+ fatal("dsa_verify failed for server_host_key");
+ key_free(server_host_key);
+
+ kex_derive_keys(kex, hash, shared_secret);
+ packet_set_kex(kex);
+
+ /* save session id */
+ session_id2_len = 20;
+ session_id2 = xmalloc(session_id2_len);
+ memcpy(session_id2, hash, session_id2_len);
}
/*
@@ -270,8 +458,8 @@ struct Authctxt {
const char *host;
const char *service;
AuthenticationConnection *agent;
- int success;
Authmethod *method;
+ int success;
};
struct Authmethod {
char *name; /* string to compare against server's list */
@@ -283,11 +471,16 @@ struct Authmethod {
void input_userauth_success(int type, int plen, void *ctxt);
void input_userauth_failure(int type, int plen, void *ctxt);
void input_userauth_error(int type, int plen, void *ctxt);
+void input_userauth_info_req(int type, int plen, void *ctxt);
+
+int userauth_none(Authctxt *authctxt);
int userauth_pubkey(Authctxt *authctxt);
int userauth_passwd(Authctxt *authctxt);
+int userauth_kbdint(Authctxt *authctxt);
void authmethod_clear();
-Authmethod *authmethod_get(char *auth_list);
+Authmethod *authmethod_get(char *authlist);
+Authmethod *authmethod_lookup(const char *name);
Authmethod authmethods[] = {
{"publickey",
@@ -298,6 +491,14 @@ Authmethod authmethods[] = {
userauth_passwd,
&options.password_authentication,
&options.batch_mode},
+ {"keyboard-interactive",
+ userauth_kbdint,
+ &options.kbd_interactive_authentication,
+ &options.batch_mode},
+ {"none",
+ userauth_none,
+ NULL,
+ NULL},
{NULL, NULL, NULL, NULL}
};
@@ -334,17 +535,13 @@ ssh_userauth2(const char *server_user, char *host)
authctxt.host = host;
authctxt.service = "ssh-connection"; /* service name */
authctxt.success = 0;
- authctxt.method = NULL;
+ authctxt.method = authmethod_lookup("none");
+ if (authctxt.method == NULL)
+ fatal("ssh_userauth2: internal error: cannot send userauth none request");
+ authmethod_clear();
/* initial userauth request */
- packet_start(SSH2_MSG_USERAUTH_REQUEST);
- packet_put_cstring(authctxt.server_user);
- packet_put_cstring(authctxt.service);
- packet_put_cstring("none");
- packet_send();
- packet_write_wait();
-
- authmethod_clear();
+ userauth_none(&authctxt);
dispatch_init(&input_userauth_error);
dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
@@ -354,7 +551,7 @@ ssh_userauth2(const char *server_user, char *host)
if (authctxt.agent != NULL)
ssh_close_authentication_connection(authctxt.agent);
- debug("ssh-userauth2 successfull");
+ debug("ssh-userauth2 successfull: method %s", authctxt.method->name);
}
void
input_userauth_error(int type, int plen, void *ctxt)
@@ -376,12 +573,11 @@ input_userauth_failure(int type, int plen, void *ctxt)
Authctxt *authctxt = ctxt;
char *authlist = NULL;
int partial;
- int dlen;
if (authctxt == NULL)
fatal("input_userauth_failure: no authentication context");
- authlist = packet_get_string(&dlen);
+ authlist = packet_get_string(NULL);
partial = packet_get_char();
packet_done();
@@ -390,12 +586,12 @@ input_userauth_failure(int type, int plen, void *ctxt)
debug("authentications that can continue: %s", authlist);
for (;;) {
- /* try old method or get next method */
method = authmethod_get(authlist);
if (method == NULL)
fatal("Unable to find an authentication method");
+ authctxt->method = method;
if (method->userauth(authctxt) != 0) {
- debug2("we sent a packet, wait for reply");
+ debug2("we sent a %s packet, wait for reply", method->name);
break;
} else {
debug2("we did not send a packet, disable method");
@@ -406,6 +602,19 @@ input_userauth_failure(int type, int plen, void *ctxt)
}
int
+userauth_none(Authctxt *authctxt)
+{
+ /* initial userauth request */
+ packet_start(SSH2_MSG_USERAUTH_REQUEST);
+ packet_put_cstring(authctxt->server_user);
+ packet_put_cstring(authctxt->service);
+ packet_put_cstring(authctxt->method->name);
+ packet_send();
+ packet_write_wait();
+ return 1;
+}
+
+int
userauth_passwd(Authctxt *authctxt)
{
static int attempt = 0;
@@ -424,7 +633,7 @@ userauth_passwd(Authctxt *authctxt)
packet_start(SSH2_MSG_USERAUTH_REQUEST);
packet_put_cstring(authctxt->server_user);
packet_put_cstring(authctxt->service);
- packet_put_cstring("password");
+ packet_put_cstring(authctxt->method->name);
packet_put_char(0);
packet_put_cstring(password);
memset(password, 0, strlen(password));
@@ -442,6 +651,7 @@ sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback)
int bloblen, slen;
int skip = 0;
int ret = -1;
+ int have_sig = 1;
dsa_make_key_blob(k, &blob, &bloblen);
@@ -460,8 +670,8 @@ sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback)
datafellows & SSH_BUG_PUBKEYAUTH ?
"ssh-userauth" :
authctxt->service);
- buffer_put_cstring(&b, "publickey");
- buffer_put_char(&b, 1);
+ buffer_put_cstring(&b, authctxt->method->name);
+ buffer_put_char(&b, have_sig);
buffer_put_cstring(&b, KEX_DSS);
buffer_put_string(&b, blob, bloblen);
@@ -481,8 +691,8 @@ sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback)
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
buffer_put_cstring(&b, authctxt->server_user);
buffer_put_cstring(&b, authctxt->service);
- buffer_put_cstring(&b, "publickey");
- buffer_put_char(&b, 1);
+ buffer_put_cstring(&b, authctxt->method->name);
+ buffer_put_char(&b, have_sig);
buffer_put_cstring(&b, KEX_DSS);
buffer_put_string(&b, blob, bloblen);
}
@@ -606,6 +816,92 @@ userauth_pubkey(Authctxt *authctxt)
return sent;
}
+/*
+ * Send userauth request message specifying keyboard-interactive method.
+ */
+int
+userauth_kbdint(Authctxt *authctxt)
+{
+ static int attempt = 0;
+
+ if (attempt++ >= options.number_of_password_prompts)
+ return 0;
+
+ debug2("userauth_kbdint");
+ packet_start(SSH2_MSG_USERAUTH_REQUEST);
+ packet_put_cstring(authctxt->server_user);
+ packet_put_cstring(authctxt->service);
+ packet_put_cstring(authctxt->method->name);
+ packet_put_cstring(""); /* lang */
+ packet_put_cstring(options.kbd_interactive_devices ?
+ options.kbd_interactive_devices : "");
+ packet_send();
+ packet_write_wait();
+
+ dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
+ return 1;
+}
+
+/*
+ * parse SSH2_MSG_USERAUTH_INFO_REQUEST, prompt user and send
+ * SSH2_MSG_USERAUTH_INFO_RESPONSE
+ */
+void
+input_userauth_info_req(int type, int plen, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ char *name = NULL;
+ char *inst = NULL;
+ char *lang = NULL;
+ char *prompt = NULL;
+ char *response = NULL;
+ unsigned int num_prompts, i;
+ int echo = 0;
+
+ debug2("input_userauth_info_req");
+
+ if (authctxt == NULL)
+ fatal("input_userauth_info_req: no authentication context");
+
+ name = packet_get_string(NULL);
+ inst = packet_get_string(NULL);
+ lang = packet_get_string(NULL);
+
+ if (strlen(name) > 0)
+ cli_mesg(name);
+ xfree(name);
+
+ if (strlen(inst) > 0)
+ cli_mesg(inst);
+ xfree(inst);
+ xfree(lang); /* unused */
+
+ num_prompts = packet_get_int();
+ /*
+ * Begin to build info response packet based on prompts requested.
+ * We commit to providing the correct number of responses, so if
+ * further on we run into a problem that prevents this, we have to
+ * be sure and clean this up and send a correct error response.
+ */
+ packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
+ packet_put_int(num_prompts);
+
+ for (i = 0; i < num_prompts; i++) {
+ prompt = packet_get_string(NULL);
+ echo = packet_get_char();
+
+ response = cli_prompt(prompt, echo);
+
+ packet_put_cstring(response);
+ memset(response, 0, strlen(response));
+ xfree(response);
+ xfree(prompt);
+ }
+ packet_done(); /* done with parsing incoming message. */
+
+ packet_send();
+ packet_write_wait();
+}
/* find auth method */
@@ -692,6 +988,7 @@ authmethod_get(char *authlist)
if (authlist_current == NULL || strcmp(authlist, authlist_current) != 0) {
/* start over if passed a different list */
+ debug3("start over, passed a different list");
authmethod_clear();
authlist_current = xstrdup(authlist);
authlist_working = xstrdup(authlist);
@@ -706,16 +1003,20 @@ authmethod_get(char *authlist)
}
while (name != NULL) {
+ debug3("authmethod_lookup %s", name);
method = authmethod_lookup(name);
- if (method != NULL && authmethod_is_enabled(method))
+ if (method != NULL && authmethod_is_enabled(method)) {
+ debug3("authmethod_is_enabled %s", name);
break;
+ }
name = strtok_r(NULL, DELIM, &authlist_state);
+ method = NULL;
}
if (authname_current != NULL)
xfree(authname_current);
- if (name != NULL) {
+ if (method != NULL) {
debug("next auth method to try is %s", name);
authname_current = xstrdup(name);
return method;
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-14 01:44:24 +0000