recvauth.c revision 1.1.1.1 
1/*	$NetBSD: recvauth.c,v 1.1.1.1 2011/04/13 18:15:37 elric Exp $	*/
2
3/*
4 * Copyright (c) 1997-2007 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "krb5_locl.h"
37
38/*
39 * See `sendauth.c' for the format.
40 */
41
42static krb5_boolean
43match_exact(const void *data, const char *appl_version)
44{
45    return strcmp(data, appl_version) == 0;
46}
47
48KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
49krb5_recvauth(krb5_context context,
50	      krb5_auth_context *auth_context,
51	      krb5_pointer p_fd,
52	      const char *appl_version,
53	      krb5_principal server,
54	      int32_t flags,
55	      krb5_keytab keytab,
56	      krb5_ticket **ticket)
57{
58    return krb5_recvauth_match_version(context, auth_context, p_fd,
59				       match_exact, appl_version,
60				       server, flags,
61				       keytab, ticket);
62}
63
64KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
65krb5_recvauth_match_version(krb5_context context,
66			    krb5_auth_context *auth_context,
67			    krb5_pointer p_fd,
68			    krb5_boolean (*match_appl_version)(const void *,
69							       const char*),
70			    const void *match_data,
71			    krb5_principal server,
72			    int32_t flags,
73			    krb5_keytab keytab,
74			    krb5_ticket **ticket)
75{
76    krb5_error_code ret;
77    const char *version = KRB5_SENDAUTH_VERSION;
78    char her_version[sizeof(KRB5_SENDAUTH_VERSION)];
79    char *her_appl_version;
80    uint32_t len;
81    u_char repl;
82    krb5_data data;
83    krb5_flags ap_options;
84    ssize_t n;
85
86    /*
87     * If there are no addresses in auth_context, get them from `fd'.
88     */
89
90    if (*auth_context == NULL) {
91	ret = krb5_auth_con_init (context, auth_context);
92	if (ret)
93	    return ret;
94    }
95
96    ret = krb5_auth_con_setaddrs_from_fd (context,
97					  *auth_context,
98					  p_fd);
99    if (ret)
100	return ret;
101
102    if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) {
103	n = krb5_net_read (context, p_fd, &len, 4);
104	if (n < 0) {
105	    ret = errno;
106	    krb5_set_error_message(context, ret, "read: %s", strerror(ret));
107	    return ret;
108	}
109	if (n == 0) {
110	    krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS,
111				   N_("Failed to receive sendauth data", ""));
112	    return KRB5_SENDAUTH_BADAUTHVERS;
113	}
114	len = ntohl(len);
115	if (len != sizeof(her_version)
116	    || krb5_net_read (context, p_fd, her_version, len) != len
117	    || strncmp (version, her_version, len)) {
118	    repl = 1;
119	    krb5_net_write (context, p_fd, &repl, 1);
120	    krb5_clear_error_message (context);
121	    return KRB5_SENDAUTH_BADAUTHVERS;
122	}
123    }
124
125    n = krb5_net_read (context, p_fd, &len, 4);
126    if (n < 0) {
127	ret = errno;
128	krb5_set_error_message(context, ret, "read: %s", strerror(ret));
129	return ret;
130    }
131    if (n == 0) {
132	krb5_clear_error_message (context);
133	return KRB5_SENDAUTH_BADAPPLVERS;
134    }
135    len = ntohl(len);
136    her_appl_version = malloc (len);
137    if (her_appl_version == NULL) {
138	repl = 2;
139	krb5_net_write (context, p_fd, &repl, 1);
140	krb5_set_error_message(context, ENOMEM,
141			       N_("malloc: out of memory", ""));
142	return ENOMEM;
143    }
144    if (krb5_net_read (context, p_fd, her_appl_version, len) != len
145	|| !(*match_appl_version)(match_data, her_appl_version)) {
146	repl = 2;
147	krb5_net_write (context, p_fd, &repl, 1);
148	krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS,
149			       N_("wrong sendauth version (%s)", ""),
150			       her_appl_version);
151	free (her_appl_version);
152	return KRB5_SENDAUTH_BADAPPLVERS;
153    }
154    free (her_appl_version);
155
156    repl = 0;
157    if (krb5_net_write (context, p_fd, &repl, 1) != 1) {
158	ret = errno;
159	krb5_set_error_message(context, ret, "write: %s", strerror(ret));
160	return ret;
161    }
162
163    krb5_data_zero (&data);
164    ret = krb5_read_message (context, p_fd, &data);
165    if (ret)
166	return ret;
167
168    ret = krb5_rd_req (context,
169		       auth_context,
170		       &data,
171		       server,
172		       keytab,
173		       &ap_options,
174		       ticket);
175    krb5_data_free (&data);
176    if (ret) {
177	krb5_data error_data;
178	krb5_error_code ret2;
179
180	ret2 = krb5_mk_error (context,
181			      ret,
182			      NULL,
183			      NULL,
184			      NULL,
185			      server,
186			      NULL,
187			      NULL,
188			      &error_data);
189	if (ret2 == 0) {
190	    krb5_write_message (context, p_fd, &error_data);
191	    krb5_data_free (&error_data);
192	}
193	return ret;
194    }
195
196    len = 0;
197    if (krb5_net_write (context, p_fd, &len, 4) != 4) {
198	ret = errno;
199	krb5_set_error_message(context, ret, "write: %s", strerror(ret));
200	krb5_free_ticket(context, *ticket);
201	*ticket = NULL;
202	return ret;
203    }
204
205    if (ap_options & AP_OPTS_MUTUAL_REQUIRED) {
206	ret = krb5_mk_rep (context, *auth_context, &data);
207	if (ret) {
208	    krb5_free_ticket(context, *ticket);
209	    *ticket = NULL;
210	    return ret;
211	}
212
213	ret = krb5_write_message (context, p_fd, &data);
214	if (ret) {
215	    krb5_free_ticket(context, *ticket);
216	    *ticket = NULL;
217	    return ret;
218	}
219	krb5_data_free (&data);
220    }
221    return 0;
222}
223