*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect2.c,v 1.61 2001/04/03 19:53:29 markus Exp $");
-
-#include <openssl/bn.h>
-#include <openssl/md5.h>
-#include <openssl/dh.h>
-#include <openssl/hmac.h>
+RCSID("$OpenBSD: sshconnect2.c,v 1.99 2002/03/26 15:58:46 markus Exp $");
#include "ssh.h"
#include "ssh2.h"
#include "xmalloc.h"
-#include "rsa.h"
#include "buffer.h"
#include "packet.h"
-#include "uidswap.h"
#include "compat.h"
#include "bufaux.h"
#include "cipher.h"
#include "kex.h"
#include "myproposal.h"
-#include "key.h"
#include "sshconnect.h"
#include "authfile.h"
-#include "cli.h"
#include "dh.h"
#include "authfd.h"
#include "log.h"
#include "readpass.h"
#include "match.h"
#include "dispatch.h"
+#include "canohost.h"
/* import */
extern char *client_version_string;
char *xxx_host;
struct sockaddr *xxx_hostaddr;
-int
-check_host_key_callback(Key *hostkey)
+Kex *xxx_kex = NULL;
+
+static int
+verify_host_key_callback(Key *hostkey)
{
- check_host_key(xxx_host, xxx_hostaddr, hostkey,
- options.user_hostfile2, options.system_hostfile2);
+ if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
+ fatal("Host key verification failed.");
return 0;
}
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
}
+ if (options.hostkeyalgorithms != NULL)
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
+ options.hostkeyalgorithms;
- kex = kex_start(myproposal);
+ /* start key exchange */
+ kex = kex_setup(myproposal);
kex->client_version_string=client_version_string;
kex->server_version_string=server_version_string;
- kex->check_host_key=&check_host_key_callback;
+ kex->verify_host_key=&verify_host_key_callback;
- /* start key exchange */
- dispatch_run(DISPATCH_BLOCK, &kex->newkeys, kex);
+ xxx_kex = kex;
+
+ dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
+
+ session_id2 = kex->session_id;
+ session_id2_len = kex->session_id_len;
#ifdef DEBUG_KEXDH
/* send 1st encrypted/maced/compressed message */
typedef int sign_cb_fn(
Authctxt *authctxt, Key *key,
- u_char **sigp, int *lenp, u_char *data, int datalen);
+ u_char **sigp, u_int *lenp, u_char *data, u_int datalen);
struct Authctxt {
const char *server_user;
+ const char *local_user;
const char *host;
const char *service;
- AuthenticationConnection *agent;
Authmethod *method;
int success;
char *authlist;
+ /* pubkey */
Key *last_key;
sign_cb_fn *last_key_sign;
int last_key_hint;
+ AuthenticationConnection *agent;
+ /* hostbased */
+ Key **keys;
+ int nkeys;
+ /* kbd-interactive */
+ int info_req_seen;
};
struct Authmethod {
char *name; /* string to compare against server's list */
int *batch_flag; /* flag in option struct that disables method */
};
-void input_userauth_success(int type, int plen, void *ctxt);
-void input_userauth_failure(int type, int plen, void *ctxt);
-void input_userauth_banner(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);
-void input_userauth_pk_ok(int type, int plen, void *ctxt);
+void input_userauth_success(int, u_int32_t, void *);
+void input_userauth_failure(int, u_int32_t, void *);
+void input_userauth_banner(int, u_int32_t, void *);
+void input_userauth_error(int, u_int32_t, void *);
+void input_userauth_info_req(int, u_int32_t, void *);
+void input_userauth_pk_ok(int, u_int32_t, void *);
+void input_userauth_passwd_changereq(int, u_int32_t, void *);
-int userauth_none(Authctxt *authctxt);
-int userauth_pubkey(Authctxt *authctxt);
-int userauth_passwd(Authctxt *authctxt);
-int userauth_kbdint(Authctxt *authctxt);
+int userauth_none(Authctxt *);
+int userauth_pubkey(Authctxt *);
+int userauth_passwd(Authctxt *);
+int userauth_kbdint(Authctxt *);
+int userauth_hostbased(Authctxt *);
-void userauth(Authctxt *authctxt, char *authlist);
+void userauth(Authctxt *, char *);
-int
-sign_and_send_pubkey(Authctxt *authctxt, Key *k,
- sign_cb_fn *sign_callback);
-void clear_auth_state(Authctxt *authctxt);
+static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *);
+static void clear_auth_state(Authctxt *);
-Authmethod *authmethod_get(char *authlist);
-Authmethod *authmethod_lookup(const char *name);
-char *authmethods_get(void);
+static Authmethod *authmethod_get(char *authlist);
+static Authmethod *authmethod_lookup(const char *name);
+static char *authmethods_get(void);
Authmethod authmethods[] = {
+ {"hostbased",
+ userauth_hostbased,
+ &options.hostbased_authentication,
+ NULL},
{"publickey",
userauth_pubkey,
&options.pubkey_authentication,
NULL},
- {"password",
- userauth_passwd,
- &options.password_authentication,
- &options.batch_mode},
{"keyboard-interactive",
userauth_kbdint,
&options.kbd_interactive_authentication,
&options.batch_mode},
+ {"password",
+ userauth_passwd,
+ &options.password_authentication,
+ &options.batch_mode},
{"none",
userauth_none,
NULL,
};
void
-ssh_userauth2(const char *server_user, char *host)
+ssh_userauth2(const char *local_user, const char *server_user, char *host,
+ Key **keys, int nkeys)
{
Authctxt authctxt;
int type;
- int plen;
- int i;
- if (options.challenge_reponse_authentication)
+ if (options.challenge_response_authentication)
options.kbd_interactive_authentication = 1;
debug("send SSH2_MSG_SERVICE_REQUEST");
packet_put_cstring("ssh-userauth");
packet_send();
packet_write_wait();
- type = packet_read(&plen);
+ type = packet_read();
if (type != SSH2_MSG_SERVICE_ACCEPT) {
fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type);
}
if (packet_remaining() > 0) {
- char *reply = packet_get_string(&plen);
+ char *reply = packet_get_string(NULL);
debug("service_accept: %s", reply);
xfree(reply);
} else {
debug("buggy server: service_accept w/o service");
}
- packet_done();
+ packet_check_eom();
debug("got SSH2_MSG_SERVICE_ACCEPT");
if (options.preferred_authentications == NULL)
options.preferred_authentications = authmethods_get();
/* setup authentication context */
+ memset(&authctxt, 0, sizeof(authctxt));
authctxt.agent = ssh_get_authentication_connection();
authctxt.server_user = server_user;
+ authctxt.local_user = local_user;
authctxt.host = host;
authctxt.service = "ssh-connection"; /* service name */
authctxt.success = 0;
authctxt.method = authmethod_lookup("none");
authctxt.authlist = NULL;
+ authctxt.keys = keys;
+ authctxt.nkeys = nkeys;
+ authctxt.info_req_seen = 0;
if (authctxt.method == NULL)
fatal("ssh_userauth2: internal error: cannot send userauth none request");
/* initial userauth request */
userauth_none(&authctxt);
- //dispatch_init(&input_userauth_error);
- for (i = 50; i <= 254; i++) {
- dispatch_set(i, &input_userauth_error);
- }
+ dispatch_init(&input_userauth_error);
dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
}
}
void
-input_userauth_error(int type, int plen, void *ctxt)
+input_userauth_error(int type, u_int32_t seq, void *ctxt)
{
fatal("input_userauth_error: bad message during authentication: "
"type %d", type);
}
void
-input_userauth_banner(int type, int plen, void *ctxt)
+input_userauth_banner(int type, u_int32_t seq, void *ctxt)
{
char *msg, *lang;
debug3("input_userauth_banner");
xfree(lang);
}
void
-input_userauth_success(int type, int plen, void *ctxt)
+input_userauth_success(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
if (authctxt == NULL)
authctxt->success = 1; /* break out */
}
void
-input_userauth_failure(int type, int plen, void *ctxt)
+input_userauth_failure(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
char *authlist = NULL;
authlist = packet_get_string(NULL);
partial = packet_get_char();
- packet_done();
+ packet_check_eom();
if (partial != 0)
log("Authenticated with partial success.");
userauth(authctxt, authlist);
}
void
-input_userauth_pk_ok(int type, int plen, void *ctxt)
+input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
Key *key = NULL;
Buffer b;
- int alen, blen, pktype, sent = 0;
- char *pkalg, *pkblob, *fp;
+ int pktype, sent = 0;
+ u_int alen, blen;
+ char *pkalg, *fp;
+ u_char *pkblob;
if (authctxt == NULL)
fatal("input_userauth_pk_ok: no authentication context");
pkalg = packet_get_string(&alen);
pkblob = packet_get_string(&blen);
}
- packet_done();
+ packet_check_eom();
debug("input_userauth_pk_ok: pkalg %s blen %d lastkey %p hint %d",
pkalg, blen, authctxt->last_key, authctxt->last_key_hint);
debug("no key from blob. pkalg %s", pkalg);
break;
}
+ if (key->type != pktype) {
+ error("input_userauth_pk_ok: type mismatch "
+ "for decoded key (received %d, expected %d)",
+ key->type, pktype);
+ break;
+ }
fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
debug2("input_userauth_pk_ok: fp %s", fp);
xfree(fp);
}
sent = sign_and_send_pubkey(authctxt, key,
authctxt->last_key_sign);
- } while(0);
+ } while (0);
if (key != NULL)
key_free(key);
userauth_passwd(Authctxt *authctxt)
{
static int attempt = 0;
- char prompt[80];
+ char prompt[150];
char *password;
if (attempt++ >= options.number_of_password_prompts)
return 0;
- if(attempt != 1)
+ if (attempt != 1)
error("Permission denied, please try again.");
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
packet_put_cstring(password);
memset(password, 0, strlen(password));
xfree(password);
- packet_inject_ignore(64);
+ packet_add_padding(64);
packet_send();
+
+ dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
+ &input_userauth_passwd_changereq);
+
return 1;
}
-
+/*
+ * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
+ */
void
+input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ char *info, *lang, *password = NULL, *retype = NULL;
+ char prompt[150];
+
+ debug2("input_userauth_passwd_changereq");
+
+ if (authctxt == NULL)
+ fatal("input_userauth_passwd_changereq: "
+ "no authentication context");
+
+ info = packet_get_string(NULL);
+ lang = packet_get_string(NULL);
+ if (strlen(info) > 0)
+ log("%s", info);
+ xfree(info);
+ xfree(lang);
+ 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_char(1); /* additional info */
+ snprintf(prompt, sizeof(prompt),
+ "Enter %.30s@%.128s's old password: ",
+ authctxt->server_user, authctxt->host);
+ password = read_passphrase(prompt, 0);
+ packet_put_cstring(password);
+ memset(password, 0, strlen(password));
+ xfree(password);
+ password = NULL;
+ while (password == NULL) {
+ snprintf(prompt, sizeof(prompt),
+ "Enter %.30s@%.128s's new password: ",
+ authctxt->server_user, authctxt->host);
+ password = read_passphrase(prompt, RP_ALLOW_EOF);
+ if (password == NULL) {
+ /* bail out */
+ return;
+ }
+ snprintf(prompt, sizeof(prompt),
+ "Retype %.30s@%.128s's new password: ",
+ authctxt->server_user, authctxt->host);
+ retype = read_passphrase(prompt, 0);
+ if (strcmp(password, retype) != 0) {
+ memset(password, 0, strlen(password));
+ xfree(password);
+ log("Mismatch; try again, EOF to quit.");
+ password = NULL;
+ }
+ memset(retype, 0, strlen(retype));
+ xfree(retype);
+ }
+ packet_put_cstring(password);
+ memset(password, 0, strlen(password));
+ xfree(password);
+ packet_add_padding(64);
+ packet_send();
+
+ dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
+ &input_userauth_passwd_changereq);
+}
+
+static void
clear_auth_state(Authctxt *authctxt)
{
/* XXX clear authentication state */
+ dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, NULL);
+
if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) {
debug3("clear_auth_state: key_free %p", authctxt->last_key);
key_free(authctxt->last_key);
authctxt->last_key_sign = NULL;
}
-int
+static int
sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback)
{
Buffer b;
u_char *blob, *signature;
- int bloblen, slen;
+ u_int bloblen, slen;
int skip = 0;
int ret = -1;
int have_sig = 1;
return 1;
}
-int
+static int
send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback,
int hint)
{
u_char *blob;
- int bloblen, have_sig = 0;
+ u_int bloblen, have_sig = 0;
debug3("send_pubkey_test");
return 1;
}
-Key *
+static Key *
load_identity_file(char *filename)
{
Key *private;
if (options.batch_mode)
return NULL;
snprintf(prompt, sizeof prompt,
- "Enter passphrase for key '%.100s': ", filename);
+ "Enter passphrase for key '%.100s': ", filename);
for (i = 0; i < options.number_of_password_prompts; i++) {
passphrase = read_passphrase(prompt, 0);
if (strcmp(passphrase, "") != 0) {
return private;
}
-int
-identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp,
- u_char *data, int datalen)
+static int
+identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
+ u_char *data, u_int datalen)
{
Key *private;
int idx, ret;
idx = authctxt->last_key_hint;
if (idx < 0)
return -1;
+
+ /* private key is stored in external hardware */
+ if (options.identity_keys[idx]->flags & KEY_FLAG_EXT)
+ return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen);
+
private = load_identity_file(options.identity_files[idx]);
if (private == NULL)
return -1;
return ret;
}
-int agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp,
- u_char *data, int datalen)
+static int
+agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
+ u_char *data, u_int datalen)
{
return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen);
}
-int key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp,
- u_char *data, int datalen)
+static int
+key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
+ u_char *data, u_int datalen)
{
- return key_sign(key, sigp, lenp, data, datalen);
+ return key_sign(key, sigp, lenp, data, datalen);
}
-int
+static int
userauth_pubkey_agent(Authctxt *authctxt)
{
static int called = 0;
if (authctxt->agent != NULL) {
do {
sent = userauth_pubkey_agent(authctxt);
- } while(!sent && authctxt->agent->howmany > 0);
+ } while (!sent && authctxt->agent->howmany > 0);
}
while (!sent && idx < options.num_identity_files) {
key = options.identity_keys[idx];
if (attempt++ >= options.number_of_password_prompts)
return 0;
+ /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
+ if (attempt > 1 && !authctxt->info_req_seen) {
+ debug3("userauth_kbdint: disable: no info_req_seen");
+ dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
+ return 0;
+ }
debug2("userauth_kbdint");
packet_start(SSH2_MSG_USERAUTH_REQUEST);
* parse INFO_REQUEST, prompt user and send INFO_RESPONSE
*/
void
-input_userauth_info_req(int type, int plen, void *ctxt)
+input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
char *name, *inst, *lang, *prompt, *response;
if (authctxt == NULL)
fatal("input_userauth_info_req: no authentication context");
+ authctxt->info_req_seen = 1;
+
name = packet_get_string(NULL);
inst = packet_get_string(NULL);
lang = packet_get_string(NULL);
if (strlen(name) > 0)
- cli_mesg(name);
+ log("%s", name);
if (strlen(inst) > 0)
- cli_mesg(inst);
+ log("%s", inst);
xfree(name);
xfree(inst);
xfree(lang);
packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
packet_put_int(num_prompts);
+ debug2("input_userauth_info_req: num_prompts %d", num_prompts);
for (i = 0; i < num_prompts; i++) {
prompt = packet_get_string(NULL);
echo = packet_get_char();
- response = cli_prompt(prompt, echo);
+ response = read_passphrase(prompt, echo ? RP_ECHO : 0);
packet_put_cstring(response);
memset(response, 0, strlen(response));
xfree(response);
xfree(prompt);
}
- packet_done(); /* done with parsing incoming message. */
+ packet_check_eom(); /* done with parsing incoming message. */
- packet_inject_ignore(64);
+ packet_add_padding(64);
packet_send();
}
+/*
+ * this will be move to an external program (ssh-keysign) ASAP. ssh-keysign
+ * will be setuid-root and the sbit can be removed from /usr/bin/ssh.
+ */
+int
+userauth_hostbased(Authctxt *authctxt)
+{
+ Key *private = NULL;
+ Buffer b;
+ u_char *signature, *blob;
+ char *chost, *pkalg, *p;
+ const char *service;
+ u_int blen, slen;
+ int ok, i, len, found = 0;
+
+ /* check for a useful key */
+ for (i = 0; i < authctxt->nkeys; i++) {
+ private = authctxt->keys[i];
+ if (private && private->type != KEY_RSA1) {
+ found = 1;
+ /* we take and free the key */
+ authctxt->keys[i] = NULL;
+ break;
+ }
+ }
+ if (!found) {
+ debug("userauth_hostbased: no more client hostkeys");
+ return 0;
+ }
+ if (key_to_blob(private, &blob, &blen) == 0) {
+ key_free(private);
+ return 0;
+ }
+ /* figure out a name for the client host */
+ p = get_local_name(packet_get_connection_in());
+ if (p == NULL) {
+ error("userauth_hostbased: cannot get local ipaddr/name");
+ key_free(private);
+ return 0;
+ }
+ len = strlen(p) + 2;
+ chost = xmalloc(len);
+ strlcpy(chost, p, len);
+ strlcat(chost, ".", len);
+ debug2("userauth_hostbased: chost %s", chost);
+
+ service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
+ authctxt->service;
+ pkalg = xstrdup(key_ssh_name(private));
+ buffer_init(&b);
+ /* construct data */
+ buffer_put_string(&b, session_id2, session_id2_len);
+ buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
+ buffer_put_cstring(&b, authctxt->server_user);
+ buffer_put_cstring(&b, service);
+ buffer_put_cstring(&b, authctxt->method->name);
+ buffer_put_cstring(&b, pkalg);
+ buffer_put_string(&b, blob, blen);
+ buffer_put_cstring(&b, chost);
+ buffer_put_cstring(&b, authctxt->local_user);
+#ifdef DEBUG_PK
+ buffer_dump(&b);
+#endif
+ ok = key_sign(private, &signature, &slen, buffer_ptr(&b), buffer_len(&b));
+ key_free(private);
+ buffer_free(&b);
+ if (ok != 0) {
+ error("key_sign failed");
+ xfree(chost);
+ xfree(pkalg);
+ return 0;
+ }
+ 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(pkalg);
+ packet_put_string(blob, blen);
+ packet_put_cstring(chost);
+ packet_put_cstring(authctxt->local_user);
+ packet_put_string(signature, slen);
+ memset(signature, 's', slen);
+ xfree(signature);
+ xfree(chost);
+ xfree(pkalg);
+
+ packet_send();
+ return 1;
+}
+
/* find auth method */
/*
* given auth method name, if configurable options permit this method fill
* in auth_ident field and return true, otherwise return false.
*/
-int
+static int
authmethod_is_enabled(Authmethod *method)
{
if (method == NULL)
return 1;
}
-Authmethod *
+static Authmethod *
authmethod_lookup(const char *name)
{
Authmethod *method = NULL;
/*
* Given the authentication method list sent by the server, return the
* next method we should try. If the server initially sends a nil list,
- * use a built-in default list.
+ * use a built-in default list.
*/
-Authmethod *
+static Authmethod *
authmethod_get(char *authlist)
{
char *name = NULL;
- int next;
+ u_int next;
/* Use a suitable default if we're passed a nil list. */
if (authlist == NULL || strlen(authlist) == 0)
}
}
-
-#define DELIM ","
-char *
+static char *
authmethods_get(void)
{
Authmethod *method = NULL;
- char buf[1024];
+ Buffer b;
+ char *list;
- buf[0] = '\0';
+ buffer_init(&b);
for (method = authmethods; method->name != NULL; method++) {
if (authmethod_is_enabled(method)) {
- if (buf[0] != '\0')
- strlcat(buf, DELIM, sizeof buf);
- strlcat(buf, method->name, sizeof buf);
+ if (buffer_len(&b) > 0)
+ buffer_append(&b, ",", 1);
+ buffer_append(&b, method->name, strlen(method->name));
}
}
- return xstrdup(buf);
+ buffer_append(&b, "\0", 1);
+ list = xstrdup(buffer_ptr(&b));
+ buffer_free(&b);
+ return list;
}
andersk / openssh.git / blobdiff