blob: c2a8936aebca76656c3590d454e0ffa7959f75b7 [file] [log] [blame]
Damien Millereba71ba2000-04-29 23:57:08 +10001/*
2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3 * All rights reserved
Damien Millere4340be2000-09-16 13:29:08 +11004 *
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
Damien Millereba71ba2000-04-29 23:57:08 +100010 */
11
12#include "includes.h"
Ben Lindstromc8226382002-04-10 16:22:09 +000013RCSID("$OpenBSD: auth1.c,v 1.40 2002/04/10 08:21:47 markus Exp $");
Damien Millereba71ba2000-04-29 23:57:08 +100014
Damien Miller874d77b2000-10-14 16:23:11 +110015#include "xmalloc.h"
16#include "rsa.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000017#include "ssh1.h"
Damien Miller874d77b2000-10-14 16:23:11 +110018#include "packet.h"
19#include "buffer.h"
20#include "mpaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000021#include "log.h"
Damien Miller874d77b2000-10-14 16:23:11 +110022#include "servconf.h"
23#include "compat.h"
24#include "auth.h"
Damien Millerc7ef63d2002-02-05 12:21:42 +110025#include "channels.h"
Damien Miller874d77b2000-10-14 16:23:11 +110026#include "session.h"
Ben Lindstromec95ed92001-07-04 04:21:14 +000027#include "uidswap.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000028#include "monitor_wrap.h"
Damien Miller874d77b2000-10-14 16:23:11 +110029
Damien Millereba71ba2000-04-29 23:57:08 +100030/* import */
31extern ServerOptions options;
Damien Miller874d77b2000-10-14 16:23:11 +110032
Damien Millereba71ba2000-04-29 23:57:08 +100033/*
34 * convert ssh auth msg type into description
35 */
Ben Lindstrombba81212001-06-25 05:01:22 +000036static char *
Damien Millereba71ba2000-04-29 23:57:08 +100037get_authname(int type)
38{
39 static char buf[1024];
40 switch (type) {
41 case SSH_CMSG_AUTH_PASSWORD:
42 return "password";
43 case SSH_CMSG_AUTH_RSA:
44 return "rsa";
45 case SSH_CMSG_AUTH_RHOSTS_RSA:
46 return "rhosts-rsa";
47 case SSH_CMSG_AUTH_RHOSTS:
48 return "rhosts";
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000049 case SSH_CMSG_AUTH_TIS:
50 case SSH_CMSG_AUTH_TIS_RESPONSE:
51 return "challenge-response";
Ben Lindstromec95ed92001-07-04 04:21:14 +000052#if defined(KRB4) || defined(KRB5)
Damien Millereba71ba2000-04-29 23:57:08 +100053 case SSH_CMSG_AUTH_KERBEROS:
54 return "kerberos";
55#endif
Damien Millereba71ba2000-04-29 23:57:08 +100056 }
57 snprintf(buf, sizeof buf, "bad-auth-msg-%d", type);
58 return buf;
59}
60
61/*
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000062 * read packets, try to authenticate the user and
63 * return only if authentication is successful
Damien Millereba71ba2000-04-29 23:57:08 +100064 */
Ben Lindstrombba81212001-06-25 05:01:22 +000065static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000066do_authloop(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +100067{
Damien Miller874d77b2000-10-14 16:23:11 +110068 int authenticated = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +000069 u_int bits;
Damien Millerda755162002-01-22 23:09:22 +110070 Key *client_host_key;
Damien Millereba71ba2000-04-29 23:57:08 +100071 BIGNUM *n;
Damien Miller874d77b2000-10-14 16:23:11 +110072 char *client_user, *password;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000073 char info[1024];
Ben Lindstrom46c16222000-12-22 01:43:59 +000074 u_int dlen;
Ben Lindstrom46c16222000-12-22 01:43:59 +000075 u_int ulen;
Damien Millereba71ba2000-04-29 23:57:08 +100076 int type = 0;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000077 struct passwd *pw = authctxt->pw;
78
79 debug("Attempting authentication for %s%.100s.",
Damien Miller9f0f5c62001-12-21 14:45:46 +110080 authctxt->valid ? "" : "illegal user ", authctxt->user);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000081
82 /* If the user has no password, accept authentication immediately. */
83 if (options.password_authentication &&
Ben Lindstromec95ed92001-07-04 04:21:14 +000084#if defined(KRB4) || defined(KRB5)
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000085 (!options.kerberos_authentication || options.kerberos_or_local_passwd) &&
86#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000087 PRIVSEP(auth_password(authctxt, ""))) {
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000088 auth_log(authctxt, 1, "without authentication", "");
89 return;
90 }
Damien Millereba71ba2000-04-29 23:57:08 +100091
92 /* Indicate that authentication is needed. */
93 packet_start(SSH_SMSG_FAILURE);
94 packet_send();
95 packet_write_wait();
96
Damien Miller874d77b2000-10-14 16:23:11 +110097 client_user = NULL;
98
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000099 for (;;) {
Damien Miller874d77b2000-10-14 16:23:11 +1100100 /* default to fail */
101 authenticated = 0;
102
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000103 info[0] = '\0';
Damien Millereba71ba2000-04-29 23:57:08 +1000104
105 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100106 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000107
108 /* Process the packet. */
109 switch (type) {
Damien Millereba71ba2000-04-29 23:57:08 +1000110
Ben Lindstromec95ed92001-07-04 04:21:14 +0000111#if defined(KRB4) || defined(KRB5)
Damien Millereba71ba2000-04-29 23:57:08 +1000112 case SSH_CMSG_AUTH_KERBEROS:
113 if (!options.kerberos_authentication) {
Damien Millereba71ba2000-04-29 23:57:08 +1000114 verbose("Kerberos authentication disabled.");
Damien Millereba71ba2000-04-29 23:57:08 +1000115 } else {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000116 char *kdata = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100117 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100118
Ben Lindstromec95ed92001-07-04 04:21:14 +0000119 if (kdata[0] == 4) { /* KRB_PROT_VERSION */
120#ifdef KRB4
121 KTEXT_ST tkt;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100122
Ben Lindstromec95ed92001-07-04 04:21:14 +0000123 tkt.length = dlen;
124 if (tkt.length < MAX_KTXT_LEN)
125 memcpy(tkt.dat, kdata, tkt.length);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100126
Ben Lindstromec95ed92001-07-04 04:21:14 +0000127 if (auth_krb4(authctxt, &tkt, &client_user)) {
128 authenticated = 1;
129 snprintf(info, sizeof(info),
130 " tktuser %.100s",
131 client_user);
Damien Miller874d77b2000-10-14 16:23:11 +1100132 }
Ben Lindstromec95ed92001-07-04 04:21:14 +0000133#endif /* KRB4 */
134 } else {
135#ifdef KRB5
136 krb5_data tkt;
137 tkt.length = dlen;
138 tkt.data = kdata;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100139
Ben Lindstromec95ed92001-07-04 04:21:14 +0000140 if (auth_krb5(authctxt, &tkt, &client_user)) {
141 authenticated = 1;
142 snprintf(info, sizeof(info),
143 " tktuser %.100s",
144 client_user);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000145 }
146#endif /* KRB5 */
Damien Millereba71ba2000-04-29 23:57:08 +1000147 }
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000148 xfree(kdata);
Damien Millereba71ba2000-04-29 23:57:08 +1000149 }
150 break;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000151#endif /* KRB4 || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100152
Ben Lindstromec95ed92001-07-04 04:21:14 +0000153#if defined(AFS) || defined(KRB5)
154 /* XXX - punt on backward compatibility here. */
155 case SSH_CMSG_HAVE_KERBEROS_TGT:
156 packet_send_debug("Kerberos TGT passing disabled before authentication.");
157 break;
158#ifdef AFS
159 case SSH_CMSG_HAVE_AFS_TOKEN:
160 packet_send_debug("AFS token passing disabled before authentication.");
161 break;
162#endif /* AFS */
163#endif /* AFS || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100164
Damien Millereba71ba2000-04-29 23:57:08 +1000165 case SSH_CMSG_AUTH_RHOSTS:
166 if (!options.rhosts_authentication) {
167 verbose("Rhosts authentication disabled.");
168 break;
169 }
170 /*
171 * Get client user name. Note that we just have to
172 * trust the client; this is one reason why rhosts
173 * authentication is insecure. (Another is
174 * IP-spoofing on a local network.)
175 */
176 client_user = packet_get_string(&ulen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100177 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000178
Damien Miller874d77b2000-10-14 16:23:11 +1100179 /* Try to authenticate using /etc/hosts.equiv and .rhosts. */
Damien Millereba71ba2000-04-29 23:57:08 +1000180 authenticated = auth_rhosts(pw, client_user);
181
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000182 snprintf(info, sizeof info, " ruser %.100s", client_user);
Damien Millereba71ba2000-04-29 23:57:08 +1000183 break;
184
185 case SSH_CMSG_AUTH_RHOSTS_RSA:
186 if (!options.rhosts_rsa_authentication) {
187 verbose("Rhosts with RSA authentication disabled.");
188 break;
189 }
190 /*
191 * Get client user name. Note that we just have to
192 * trust the client; root on the client machine can
193 * claim to be any user.
194 */
195 client_user = packet_get_string(&ulen);
196
197 /* Get the client host key. */
Damien Millerda755162002-01-22 23:09:22 +1100198 client_host_key = key_new(KEY_RSA1);
Damien Millereba71ba2000-04-29 23:57:08 +1000199 bits = packet_get_int();
Damien Millerd432ccf2002-01-22 23:14:44 +1100200 packet_get_bignum(client_host_key->rsa->e);
201 packet_get_bignum(client_host_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000202
Damien Millerda755162002-01-22 23:09:22 +1100203 if (bits != BN_num_bits(client_host_key->rsa->n))
Damien Miller874d77b2000-10-14 16:23:11 +1100204 verbose("Warning: keysize mismatch for client_host_key: "
Damien Millerda755162002-01-22 23:09:22 +1100205 "actual %d, announced %d",
206 BN_num_bits(client_host_key->rsa->n), bits);
Damien Miller48b03fc2002-01-22 23:11:40 +1100207 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000208
Damien Millerda755162002-01-22 23:09:22 +1100209 authenticated = auth_rhosts_rsa(pw, client_user,
Damien Millerd221ca62002-01-22 23:11:00 +1100210 client_host_key);
Damien Millerda755162002-01-22 23:09:22 +1100211 key_free(client_host_key);
Damien Millereba71ba2000-04-29 23:57:08 +1000212
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000213 snprintf(info, sizeof info, " ruser %.100s", client_user);
Damien Millereba71ba2000-04-29 23:57:08 +1000214 break;
215
216 case SSH_CMSG_AUTH_RSA:
217 if (!options.rsa_authentication) {
218 verbose("RSA authentication disabled.");
219 break;
220 }
221 /* RSA authentication requested. */
Damien Millerda755162002-01-22 23:09:22 +1100222 if ((n = BN_new()) == NULL)
223 fatal("do_authloop: BN_new failed");
Damien Millerd432ccf2002-01-22 23:14:44 +1100224 packet_get_bignum(n);
Damien Miller48b03fc2002-01-22 23:11:40 +1100225 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000226 authenticated = auth_rsa(pw, n);
227 BN_clear_free(n);
228 break;
229
230 case SSH_CMSG_AUTH_PASSWORD:
231 if (!options.password_authentication) {
232 verbose("Password authentication disabled.");
233 break;
234 }
235 /*
236 * Read user password. It is in plain text, but was
237 * transmitted over the encrypted channel so it is
238 * not visible to an outside observer.
239 */
240 password = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100241 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000242
Kevin Steves12aaa042001-01-24 21:23:39 +0000243 /* Try authentication with the password. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000244 authenticated = PRIVSEP(auth_password(authctxt, password));
Damien Millereba71ba2000-04-29 23:57:08 +1000245
246 memset(password, 0, strlen(password));
247 xfree(password);
248 break;
249
Damien Millereba71ba2000-04-29 23:57:08 +1000250 case SSH_CMSG_AUTH_TIS:
251 debug("rcvd SSH_CMSG_AUTH_TIS");
Ben Lindstrom551ea372001-06-05 18:56:16 +0000252 if (options.challenge_response_authentication == 1) {
253 char *challenge = get_challenge(authctxt);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000254 if (challenge != NULL) {
255 debug("sending challenge '%s'", challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000256 packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000257 packet_put_cstring(challenge);
Ben Lindstrom551ea372001-06-05 18:56:16 +0000258 xfree(challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000259 packet_send();
260 packet_write_wait();
261 continue;
262 }
263 }
264 break;
265 case SSH_CMSG_AUTH_TIS_RESPONSE:
266 debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE");
Ben Lindstrom551ea372001-06-05 18:56:16 +0000267 if (options.challenge_response_authentication == 1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000268 char *response = packet_get_string(&dlen);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000269 debug("got response '%s'", response);
Damien Miller48b03fc2002-01-22 23:11:40 +1100270 packet_check_eom();
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000271 authenticated = verify_response(authctxt, response);
272 memset(response, 'r', dlen);
Damien Millereba71ba2000-04-29 23:57:08 +1000273 xfree(response);
274 }
275 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000276
277 default:
278 /*
279 * Any unknown messages will be ignored (and failure
280 * returned) during authentication.
281 */
282 log("Unknown message during authentication: type %d", type);
283 break;
284 }
Damien Miller60396b02001-02-18 17:01:00 +1100285#ifdef BSD_AUTH
286 if (authctxt->as) {
287 auth_close(authctxt->as);
288 authctxt->as = NULL;
289 }
290#endif
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000291 if (!authctxt->valid && authenticated)
292 fatal("INTERNAL ERROR: authenticated invalid user %s",
293 authctxt->user);
Damien Millereba71ba2000-04-29 23:57:08 +1000294
Kevin Stevesef4eea92001-02-05 12:42:17 +0000295#ifdef HAVE_CYGWIN
296 if (authenticated &&
Damien Miller0dea79d2001-12-29 14:08:28 +1100297 !check_nt_auth(type == SSH_CMSG_AUTH_PASSWORD, pw)) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100298 packet_disconnect("Authentication rejected for uid %d.",
Damien Miller0dea79d2001-12-29 14:08:28 +1100299 pw == NULL ? -1 : pw->pw_uid);
Damien Millerbac2d8a2000-09-05 16:13:06 +1100300 authenticated = 0;
301 }
Ben Lindstrom5dc81502001-01-19 06:10:29 +0000302#else
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000303 /* Special handling for root */
Ben Lindstromd8a90212001-02-15 03:08:27 +0000304 if (authenticated && authctxt->pw->pw_uid == 0 &&
305 !auth_root_allowed(get_authname(type)))
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000306 authenticated = 0;
Ben Lindstrom5dc81502001-01-19 06:10:29 +0000307#endif
Kevin Stevesef4eea92001-02-05 12:42:17 +0000308#ifdef USE_PAM
Damien Miller874d77b2000-10-14 16:23:11 +1100309 if (authenticated && !do_pam_account(pw->pw_name, client_user))
310 authenticated = 0;
311#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000312
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000313 /* Log before sending the reply */
314 auth_log(authctxt, authenticated, get_authname(type), info);
315
Damien Millereba71ba2000-04-29 23:57:08 +1000316 if (client_user != NULL) {
317 xfree(client_user);
318 client_user = NULL;
319 }
320
Damien Miller874d77b2000-10-14 16:23:11 +1100321 if (authenticated)
322 return;
323
Kevin Steves12aaa042001-01-24 21:23:39 +0000324 if (authctxt->failures++ > AUTH_FAIL_MAX) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000325#ifdef WITH_AIXAUTHENTICATE
326 loginfailed(authctxt->user,
Damien Millerf3451a22002-02-05 12:40:46 +1100327 get_canonical_hostname(options.verify_reverse_mapping),
Damien Miller33804262001-02-04 23:20:18 +1100328 "ssh");
Damien Millerd2c208a2000-05-17 22:00:02 +1000329#endif /* WITH_AIXAUTHENTICATE */
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000330 packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
Damien Millerd2c208a2000-05-17 22:00:02 +1000331 }
Damien Millereba71ba2000-04-29 23:57:08 +1000332
Damien Millereba71ba2000-04-29 23:57:08 +1000333 packet_start(SSH_SMSG_FAILURE);
334 packet_send();
335 packet_write_wait();
336 }
337}
338
339/*
340 * Performs authentication of an incoming connection. Session key has already
341 * been exchanged and encryption is enabled.
342 */
Ben Lindstrom73ab9ba2002-03-22 01:27:35 +0000343Authctxt *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000344do_authentication(void)
Damien Millereba71ba2000-04-29 23:57:08 +1000345{
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000346 Authctxt *authctxt;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000347 u_int ulen;
Ben Lindstromc8226382002-04-10 16:22:09 +0000348 char *user, *style = NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000349
350 /* Get the name of the user that we wish to log in as. */
Damien Millerdff50992002-01-22 23:16:32 +1100351 packet_read_expect(SSH_CMSG_USER);
Damien Millereba71ba2000-04-29 23:57:08 +1000352
353 /* Get the user name. */
354 user = packet_get_string(&ulen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100355 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000356
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000357 if ((style = strchr(user, ':')) != NULL)
Ben Lindstromec95ed92001-07-04 04:21:14 +0000358 *style++ = '\0';
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000359
Ben Lindstromc8226382002-04-10 16:22:09 +0000360#ifdef KRB5
Ben Lindstromec95ed92001-07-04 04:21:14 +0000361 /* XXX - SSH.com Kerberos v5 braindeath. */
Ben Lindstromc8226382002-04-10 16:22:09 +0000362 if ((datafellows & SSH_BUG_K5USER) &&
363 options.kerberos_authentication) {
364 char *p;
365 if ((p = strchr(user, '@')) != NULL)
366 *p = '\0';
367 }
368#endif
Damien Miller9f0f5c62001-12-21 14:45:46 +1100369
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000370 authctxt = authctxt_new();
371 authctxt->user = user;
372 authctxt->style = style;
373
Damien Millereba71ba2000-04-29 23:57:08 +1000374 /* Verify that the user is a valid user. */
Ben Lindstrom7ebb6352002-03-22 03:04:08 +0000375 if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL)
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000376 authctxt->valid = 1;
Ben Lindstrom7ebb6352002-03-22 03:04:08 +0000377 else
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000378 debug("do_authentication: illegal user %s", user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000379
Ben Lindstrom7ebb6352002-03-22 03:04:08 +0000380 setproctitle("%s%s", authctxt->pw ? user : "unknown",
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000381 use_privsep ? " [net]" : "");
Ben Lindstromc1ba31f2001-02-15 03:14:11 +0000382
Damien Millereba71ba2000-04-29 23:57:08 +1000383#ifdef USE_PAM
Ben Lindstrom53f18302002-03-27 16:50:03 +0000384 start_pam(authctxt->pw == NULL ? "NOUSER" : user);
Damien Millereba71ba2000-04-29 23:57:08 +1000385#endif
386
387 /*
388 * If we are not running as root, the user must have the same uid as
Damien Miller874d77b2000-10-14 16:23:11 +1100389 * the server. (Unless you are running Windows)
Damien Millereba71ba2000-04-29 23:57:08 +1000390 */
Damien Miller874d77b2000-10-14 16:23:11 +1100391#ifndef HAVE_CYGWIN
Ben Lindstrom7ebb6352002-03-22 03:04:08 +0000392 if (!use_privsep && getuid() != 0 && authctxt->pw &&
393 authctxt->pw->pw_uid != getuid())
Damien Millereba71ba2000-04-29 23:57:08 +1000394 packet_disconnect("Cannot change user when server not running as root.");
Damien Millerbac2d8a2000-09-05 16:13:06 +1100395#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000396
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000397 /*
Kevin Steves12aaa042001-01-24 21:23:39 +0000398 * Loop until the user has been authenticated or the connection is
399 * closed, do_authloop() returns only if authentication is successful
400 */
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000401 do_authloop(authctxt);
Damien Millereba71ba2000-04-29 23:57:08 +1000402
403 /* The user has been authenticated and accepted. */
Damien Miller874d77b2000-10-14 16:23:11 +1100404 packet_start(SSH_SMSG_SUCCESS);
405 packet_send();
406 packet_write_wait();
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000407
Ben Lindstrom73ab9ba2002-03-22 01:27:35 +0000408 return (authctxt);
Damien Millereba71ba2000-04-29 23:57:08 +1000409}