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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"
Damien Millerdff50992002-01-22 23:16:32 +110013RCSID("$OpenBSD: auth1.c,v 1.34 2001/12/28 14:50:54 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"
25#include "session.h"
Ben Lindstrom086cf212001-03-05 05:56:40 +000026#include "misc.h"
Ben Lindstromec95ed92001-07-04 04:21:14 +000027#include "uidswap.h"
Damien Miller874d77b2000-10-14 16:23:11 +110028
Damien Millereba71ba2000-04-29 23:57:08 +100029/* import */
30extern ServerOptions options;
Damien Miller874d77b2000-10-14 16:23:11 +110031
Damien Millereba71ba2000-04-29 23:57:08 +100032/*
33 * convert ssh auth msg type into description
34 */
Ben Lindstrombba81212001-06-25 05:01:22 +000035static char *
Damien Millereba71ba2000-04-29 23:57:08 +100036get_authname(int type)
37{
38 static char buf[1024];
39 switch (type) {
40 case SSH_CMSG_AUTH_PASSWORD:
41 return "password";
42 case SSH_CMSG_AUTH_RSA:
43 return "rsa";
44 case SSH_CMSG_AUTH_RHOSTS_RSA:
45 return "rhosts-rsa";
46 case SSH_CMSG_AUTH_RHOSTS:
47 return "rhosts";
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000048 case SSH_CMSG_AUTH_TIS:
49 case SSH_CMSG_AUTH_TIS_RESPONSE:
50 return "challenge-response";
Ben Lindstromec95ed92001-07-04 04:21:14 +000051#if defined(KRB4) || defined(KRB5)
Damien Millereba71ba2000-04-29 23:57:08 +100052 case SSH_CMSG_AUTH_KERBEROS:
53 return "kerberos";
54#endif
Damien Millereba71ba2000-04-29 23:57:08 +100055 }
56 snprintf(buf, sizeof buf, "bad-auth-msg-%d", type);
57 return buf;
58}
59
60/*
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000061 * read packets, try to authenticate the user and
62 * return only if authentication is successful
Damien Millereba71ba2000-04-29 23:57:08 +100063 */
Ben Lindstrombba81212001-06-25 05:01:22 +000064static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000065do_authloop(Authctxt *authctxt)
Damien Millereba71ba2000-04-29 23:57:08 +100066{
Damien Miller874d77b2000-10-14 16:23:11 +110067 int authenticated = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +000068 u_int bits;
Damien Millerda755162002-01-22 23:09:22 +110069 Key *client_host_key;
Damien Millereba71ba2000-04-29 23:57:08 +100070 BIGNUM *n;
Damien Miller874d77b2000-10-14 16:23:11 +110071 char *client_user, *password;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000072 char info[1024];
Ben Lindstrom46c16222000-12-22 01:43:59 +000073 u_int dlen;
Ben Lindstrom46c16222000-12-22 01:43:59 +000074 u_int ulen;
Damien Millereba71ba2000-04-29 23:57:08 +100075 int type = 0;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000076 struct passwd *pw = authctxt->pw;
77
78 debug("Attempting authentication for %s%.100s.",
Damien Miller9f0f5c62001-12-21 14:45:46 +110079 authctxt->valid ? "" : "illegal user ", authctxt->user);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000080
81 /* If the user has no password, accept authentication immediately. */
82 if (options.password_authentication &&
Ben Lindstromec95ed92001-07-04 04:21:14 +000083#if defined(KRB4) || defined(KRB5)
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000084 (!options.kerberos_authentication || options.kerberos_or_local_passwd) &&
85#endif
Ben Lindstromb100ec92001-01-19 05:37:32 +000086#ifdef USE_PAM
Kevin Stevesbca8c8f2001-02-13 11:26:21 +000087 auth_pam_password(pw, "")) {
Damien Miller92ddb7d2001-02-14 01:25:23 +110088#elif defined(HAVE_OSF_SIA)
89 0) {
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000090#else
Damien Miller60396b02001-02-18 17:01:00 +110091 auth_password(authctxt, "")) {
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000092#endif
93 auth_log(authctxt, 1, "without authentication", "");
94 return;
95 }
Damien Millereba71ba2000-04-29 23:57:08 +100096
97 /* Indicate that authentication is needed. */
98 packet_start(SSH_SMSG_FAILURE);
99 packet_send();
100 packet_write_wait();
101
Damien Miller874d77b2000-10-14 16:23:11 +1100102 client_user = NULL;
103
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000104 for (;;) {
Damien Miller874d77b2000-10-14 16:23:11 +1100105 /* default to fail */
106 authenticated = 0;
107
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000108 info[0] = '\0';
Damien Millereba71ba2000-04-29 23:57:08 +1000109
110 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100111 type = packet_read();
Damien Millereba71ba2000-04-29 23:57:08 +1000112
113 /* Process the packet. */
114 switch (type) {
Damien Millereba71ba2000-04-29 23:57:08 +1000115
Ben Lindstromec95ed92001-07-04 04:21:14 +0000116#if defined(KRB4) || defined(KRB5)
Damien Millereba71ba2000-04-29 23:57:08 +1000117 case SSH_CMSG_AUTH_KERBEROS:
118 if (!options.kerberos_authentication) {
Damien Millereba71ba2000-04-29 23:57:08 +1000119 verbose("Kerberos authentication disabled.");
Damien Millereba71ba2000-04-29 23:57:08 +1000120 } else {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000121 char *kdata = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100122 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100123
Ben Lindstromec95ed92001-07-04 04:21:14 +0000124 if (kdata[0] == 4) { /* KRB_PROT_VERSION */
125#ifdef KRB4
126 KTEXT_ST tkt;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100127
Ben Lindstromec95ed92001-07-04 04:21:14 +0000128 tkt.length = dlen;
129 if (tkt.length < MAX_KTXT_LEN)
130 memcpy(tkt.dat, kdata, tkt.length);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100131
Ben Lindstromec95ed92001-07-04 04:21:14 +0000132 if (auth_krb4(authctxt, &tkt, &client_user)) {
133 authenticated = 1;
134 snprintf(info, sizeof(info),
135 " tktuser %.100s",
136 client_user);
Damien Miller874d77b2000-10-14 16:23:11 +1100137 }
Ben Lindstromec95ed92001-07-04 04:21:14 +0000138#endif /* KRB4 */
139 } else {
140#ifdef KRB5
141 krb5_data tkt;
142 tkt.length = dlen;
143 tkt.data = kdata;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100144
Ben Lindstromec95ed92001-07-04 04:21:14 +0000145 if (auth_krb5(authctxt, &tkt, &client_user)) {
146 authenticated = 1;
147 snprintf(info, sizeof(info),
148 " tktuser %.100s",
149 client_user);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000150 }
151#endif /* KRB5 */
Damien Millereba71ba2000-04-29 23:57:08 +1000152 }
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000153 xfree(kdata);
Damien Millereba71ba2000-04-29 23:57:08 +1000154 }
155 break;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000156#endif /* KRB4 || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100157
Ben Lindstromec95ed92001-07-04 04:21:14 +0000158#if defined(AFS) || defined(KRB5)
159 /* XXX - punt on backward compatibility here. */
160 case SSH_CMSG_HAVE_KERBEROS_TGT:
161 packet_send_debug("Kerberos TGT passing disabled before authentication.");
162 break;
163#ifdef AFS
164 case SSH_CMSG_HAVE_AFS_TOKEN:
165 packet_send_debug("AFS token passing disabled before authentication.");
166 break;
167#endif /* AFS */
168#endif /* AFS || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100169
Damien Millereba71ba2000-04-29 23:57:08 +1000170 case SSH_CMSG_AUTH_RHOSTS:
171 if (!options.rhosts_authentication) {
172 verbose("Rhosts authentication disabled.");
173 break;
174 }
175 /*
176 * Get client user name. Note that we just have to
177 * trust the client; this is one reason why rhosts
178 * authentication is insecure. (Another is
179 * IP-spoofing on a local network.)
180 */
181 client_user = packet_get_string(&ulen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100182 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000183
Damien Miller874d77b2000-10-14 16:23:11 +1100184 /* Try to authenticate using /etc/hosts.equiv and .rhosts. */
Damien Millereba71ba2000-04-29 23:57:08 +1000185 authenticated = auth_rhosts(pw, client_user);
186
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000187 snprintf(info, sizeof info, " ruser %.100s", client_user);
Damien Millereba71ba2000-04-29 23:57:08 +1000188 break;
189
190 case SSH_CMSG_AUTH_RHOSTS_RSA:
191 if (!options.rhosts_rsa_authentication) {
192 verbose("Rhosts with RSA authentication disabled.");
193 break;
194 }
195 /*
196 * Get client user name. Note that we just have to
197 * trust the client; root on the client machine can
198 * claim to be any user.
199 */
200 client_user = packet_get_string(&ulen);
201
202 /* Get the client host key. */
Damien Millerda755162002-01-22 23:09:22 +1100203 client_host_key = key_new(KEY_RSA1);
Damien Millereba71ba2000-04-29 23:57:08 +1000204 bits = packet_get_int();
Damien Millerd432ccf2002-01-22 23:14:44 +1100205 packet_get_bignum(client_host_key->rsa->e);
206 packet_get_bignum(client_host_key->rsa->n);
Damien Millereba71ba2000-04-29 23:57:08 +1000207
Damien Millerda755162002-01-22 23:09:22 +1100208 if (bits != BN_num_bits(client_host_key->rsa->n))
Damien Miller874d77b2000-10-14 16:23:11 +1100209 verbose("Warning: keysize mismatch for client_host_key: "
Damien Millerda755162002-01-22 23:09:22 +1100210 "actual %d, announced %d",
211 BN_num_bits(client_host_key->rsa->n), bits);
Damien Miller48b03fc2002-01-22 23:11:40 +1100212 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000213
Damien Millerda755162002-01-22 23:09:22 +1100214 authenticated = auth_rhosts_rsa(pw, client_user,
Damien Millerd221ca62002-01-22 23:11:00 +1100215 client_host_key);
Damien Millerda755162002-01-22 23:09:22 +1100216 key_free(client_host_key);
Damien Millereba71ba2000-04-29 23:57:08 +1000217
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000218 snprintf(info, sizeof info, " ruser %.100s", client_user);
Damien Millereba71ba2000-04-29 23:57:08 +1000219 break;
220
221 case SSH_CMSG_AUTH_RSA:
222 if (!options.rsa_authentication) {
223 verbose("RSA authentication disabled.");
224 break;
225 }
226 /* RSA authentication requested. */
Damien Millerda755162002-01-22 23:09:22 +1100227 if ((n = BN_new()) == NULL)
228 fatal("do_authloop: BN_new failed");
Damien Millerd432ccf2002-01-22 23:14:44 +1100229 packet_get_bignum(n);
Damien Miller48b03fc2002-01-22 23:11:40 +1100230 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000231 authenticated = auth_rsa(pw, n);
232 BN_clear_free(n);
233 break;
234
235 case SSH_CMSG_AUTH_PASSWORD:
236 if (!options.password_authentication) {
237 verbose("Password authentication disabled.");
238 break;
239 }
240 /*
241 * Read user password. It is in plain text, but was
242 * transmitted over the encrypted channel so it is
243 * not visible to an outside observer.
244 */
245 password = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100246 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000247
248#ifdef USE_PAM
249 /* Do PAM auth with password */
250 authenticated = auth_pam_password(pw, password);
Damien Millerb8c656e2000-06-28 15:22:41 +1000251#elif defined(HAVE_OSF_SIA)
252 /* Do SIA auth with password */
Damien Miller92ddb7d2001-02-14 01:25:23 +1100253 authenticated = auth_sia_password(authctxt->user,
254 password);
Damien Millerb8c656e2000-06-28 15:22:41 +1000255#else /* !USE_PAM && !HAVE_OSF_SIA */
Kevin Steves12aaa042001-01-24 21:23:39 +0000256 /* Try authentication with the password. */
Damien Miller60396b02001-02-18 17:01:00 +1100257 authenticated = auth_password(authctxt, password);
Damien Millereba71ba2000-04-29 23:57:08 +1000258#endif /* USE_PAM */
259
260 memset(password, 0, strlen(password));
261 xfree(password);
262 break;
263
Damien Millereba71ba2000-04-29 23:57:08 +1000264 case SSH_CMSG_AUTH_TIS:
265 debug("rcvd SSH_CMSG_AUTH_TIS");
Ben Lindstrom551ea372001-06-05 18:56:16 +0000266 if (options.challenge_response_authentication == 1) {
267 char *challenge = get_challenge(authctxt);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000268 if (challenge != NULL) {
269 debug("sending challenge '%s'", challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000270 packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000271 packet_put_cstring(challenge);
Ben Lindstrom551ea372001-06-05 18:56:16 +0000272 xfree(challenge);
Damien Millereba71ba2000-04-29 23:57:08 +1000273 packet_send();
274 packet_write_wait();
275 continue;
276 }
277 }
278 break;
279 case SSH_CMSG_AUTH_TIS_RESPONSE:
280 debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE");
Ben Lindstrom551ea372001-06-05 18:56:16 +0000281 if (options.challenge_response_authentication == 1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000282 char *response = packet_get_string(&dlen);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000283 debug("got response '%s'", response);
Damien Miller48b03fc2002-01-22 23:11:40 +1100284 packet_check_eom();
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000285 authenticated = verify_response(authctxt, response);
286 memset(response, 'r', dlen);
Damien Millereba71ba2000-04-29 23:57:08 +1000287 xfree(response);
288 }
289 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000290
291 default:
292 /*
293 * Any unknown messages will be ignored (and failure
294 * returned) during authentication.
295 */
296 log("Unknown message during authentication: type %d", type);
297 break;
298 }
Damien Miller60396b02001-02-18 17:01:00 +1100299#ifdef BSD_AUTH
300 if (authctxt->as) {
301 auth_close(authctxt->as);
302 authctxt->as = NULL;
303 }
304#endif
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000305 if (!authctxt->valid && authenticated)
306 fatal("INTERNAL ERROR: authenticated invalid user %s",
307 authctxt->user);
Damien Millereba71ba2000-04-29 23:57:08 +1000308
Kevin Stevesef4eea92001-02-05 12:42:17 +0000309#ifdef HAVE_CYGWIN
310 if (authenticated &&
Damien Miller0dea79d2001-12-29 14:08:28 +1100311 !check_nt_auth(type == SSH_CMSG_AUTH_PASSWORD, pw)) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100312 packet_disconnect("Authentication rejected for uid %d.",
Damien Miller0dea79d2001-12-29 14:08:28 +1100313 pw == NULL ? -1 : pw->pw_uid);
Damien Millerbac2d8a2000-09-05 16:13:06 +1100314 authenticated = 0;
315 }
Ben Lindstrom5dc81502001-01-19 06:10:29 +0000316#else
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000317 /* Special handling for root */
Ben Lindstromd8a90212001-02-15 03:08:27 +0000318 if (authenticated && authctxt->pw->pw_uid == 0 &&
319 !auth_root_allowed(get_authname(type)))
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000320 authenticated = 0;
Ben Lindstrom5dc81502001-01-19 06:10:29 +0000321#endif
Kevin Stevesef4eea92001-02-05 12:42:17 +0000322#ifdef USE_PAM
Damien Miller874d77b2000-10-14 16:23:11 +1100323 if (authenticated && !do_pam_account(pw->pw_name, client_user))
324 authenticated = 0;
325#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000326
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000327 /* Log before sending the reply */
328 auth_log(authctxt, authenticated, get_authname(type), info);
329
Damien Millereba71ba2000-04-29 23:57:08 +1000330 if (client_user != NULL) {
331 xfree(client_user);
332 client_user = NULL;
333 }
334
Damien Miller874d77b2000-10-14 16:23:11 +1100335 if (authenticated)
336 return;
337
Kevin Steves12aaa042001-01-24 21:23:39 +0000338 if (authctxt->failures++ > AUTH_FAIL_MAX) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000339#ifdef WITH_AIXAUTHENTICATE
340 loginfailed(authctxt->user,
341 get_canonical_hostname(options.reverse_mapping_check),
Damien Miller33804262001-02-04 23:20:18 +1100342 "ssh");
Damien Millerd2c208a2000-05-17 22:00:02 +1000343#endif /* WITH_AIXAUTHENTICATE */
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000344 packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
Damien Millerd2c208a2000-05-17 22:00:02 +1000345 }
Damien Millereba71ba2000-04-29 23:57:08 +1000346
Damien Millereba71ba2000-04-29 23:57:08 +1000347 packet_start(SSH_SMSG_FAILURE);
348 packet_send();
349 packet_write_wait();
350 }
351}
352
353/*
354 * Performs authentication of an incoming connection. Session key has already
355 * been exchanged and encryption is enabled.
356 */
357void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000358do_authentication(void)
Damien Millereba71ba2000-04-29 23:57:08 +1000359{
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000360 Authctxt *authctxt;
361 struct passwd *pw;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000362 u_int ulen;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000363 char *p, *user, *style = NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000364
365 /* Get the name of the user that we wish to log in as. */
Damien Millerdff50992002-01-22 23:16:32 +1100366 packet_read_expect(SSH_CMSG_USER);
Damien Millereba71ba2000-04-29 23:57:08 +1000367
368 /* Get the user name. */
369 user = packet_get_string(&ulen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100370 packet_check_eom();
Damien Millereba71ba2000-04-29 23:57:08 +1000371
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000372 if ((style = strchr(user, ':')) != NULL)
Ben Lindstromec95ed92001-07-04 04:21:14 +0000373 *style++ = '\0';
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000374
Ben Lindstromec95ed92001-07-04 04:21:14 +0000375 /* XXX - SSH.com Kerberos v5 braindeath. */
376 if ((p = strchr(user, '@')) != NULL)
377 *p = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100378
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000379 authctxt = authctxt_new();
380 authctxt->user = user;
381 authctxt->style = style;
382
Damien Millereba71ba2000-04-29 23:57:08 +1000383 /* Verify that the user is a valid user. */
384 pw = getpwnam(user);
Damien Miller874d77b2000-10-14 16:23:11 +1100385 if (pw && allowed_user(pw)) {
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000386 authctxt->valid = 1;
387 pw = pwcopy(pw);
Damien Miller874d77b2000-10-14 16:23:11 +1100388 } else {
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000389 debug("do_authentication: illegal user %s", user);
Damien Miller874d77b2000-10-14 16:23:11 +1100390 pw = NULL;
391 }
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000392 authctxt->pw = pw;
Damien Millereba71ba2000-04-29 23:57:08 +1000393
Ben Lindstromc1ba31f2001-02-15 03:14:11 +0000394 setproctitle("%s", pw ? user : "unknown");
395
Damien Millereba71ba2000-04-29 23:57:08 +1000396#ifdef USE_PAM
Damien Miller874d77b2000-10-14 16:23:11 +1100397 if (pw)
Damien Miller22e22bf2001-01-19 15:46:38 +1100398 start_pam(user);
Damien Millereba71ba2000-04-29 23:57:08 +1000399#endif
400
401 /*
402 * If we are not running as root, the user must have the same uid as
Damien Miller874d77b2000-10-14 16:23:11 +1100403 * the server. (Unless you are running Windows)
Damien Millereba71ba2000-04-29 23:57:08 +1000404 */
Damien Miller874d77b2000-10-14 16:23:11 +1100405#ifndef HAVE_CYGWIN
406 if (getuid() != 0 && pw && pw->pw_uid != getuid())
Damien Millereba71ba2000-04-29 23:57:08 +1000407 packet_disconnect("Cannot change user when server not running as root.");
Damien Millerbac2d8a2000-09-05 16:13:06 +1100408#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000409
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000410 /*
Kevin Steves12aaa042001-01-24 21:23:39 +0000411 * Loop until the user has been authenticated or the connection is
412 * closed, do_authloop() returns only if authentication is successful
413 */
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000414 do_authloop(authctxt);
Damien Millereba71ba2000-04-29 23:57:08 +1000415
416 /* The user has been authenticated and accepted. */
Damien Miller874d77b2000-10-14 16:23:11 +1100417 packet_start(SSH_SMSG_SUCCESS);
418 packet_send();
419 packet_write_wait();
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000420
Damien Millereba71ba2000-04-29 23:57:08 +1000421 /* Perform session preparation. */
Ben Lindstromb31783d2001-03-22 02:02:12 +0000422 do_authenticated(authctxt);
Damien Millereba71ba2000-04-29 23:57:08 +1000423}