source: heimdal/trunk/lib/krb5/recvauth.c@ 5

Last change on this file since 5 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 6.2 KB
Line 
1/*
2 * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36/*
37 * See `sendauth.c' for the format.
38 */
39
40static krb5_boolean
41match_exact(const void *data, const char *appl_version)
42{
43 return strcmp(data, appl_version) == 0;
44}
45
46KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
47krb5_recvauth(krb5_context context,
48 krb5_auth_context *auth_context,
49 krb5_pointer p_fd,
50 const char *appl_version,
51 krb5_principal server,
52 int32_t flags,
53 krb5_keytab keytab,
54 krb5_ticket **ticket)
55{
56 return krb5_recvauth_match_version(context, auth_context, p_fd,
57 match_exact, appl_version,
58 server, flags,
59 keytab, ticket);
60}
61
62KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
63krb5_recvauth_match_version(krb5_context context,
64 krb5_auth_context *auth_context,
65 krb5_pointer p_fd,
66 krb5_boolean (*match_appl_version)(const void *,
67 const char*),
68 const void *match_data,
69 krb5_principal server,
70 int32_t flags,
71 krb5_keytab keytab,
72 krb5_ticket **ticket)
73{
74 krb5_error_code ret;
75 const char *version = KRB5_SENDAUTH_VERSION;
76 char her_version[sizeof(KRB5_SENDAUTH_VERSION)];
77 char *her_appl_version;
78 uint32_t len;
79 u_char repl;
80 krb5_data data;
81 krb5_flags ap_options;
82 ssize_t n;
83
84 /*
85 * If there are no addresses in auth_context, get them from `fd'.
86 */
87
88 if (*auth_context == NULL) {
89 ret = krb5_auth_con_init (context, auth_context);
90 if (ret)
91 return ret;
92 }
93
94 ret = krb5_auth_con_setaddrs_from_fd (context,
95 *auth_context,
96 p_fd);
97 if (ret)
98 return ret;
99
100 if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) {
101 n = krb5_net_read (context, p_fd, &len, 4);
102 if (n < 0) {
103 ret = errno;
104 krb5_set_error_message(context, ret, "read: %s", strerror(ret));
105 return ret;
106 }
107 if (n == 0) {
108 krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS,
109 N_("Failed to receive sendauth data", ""));
110 return KRB5_SENDAUTH_BADAUTHVERS;
111 }
112 len = ntohl(len);
113 if (len != sizeof(her_version)
114 || krb5_net_read (context, p_fd, her_version, len) != len
115 || strncmp (version, her_version, len)) {
116 repl = 1;
117 krb5_net_write (context, p_fd, &repl, 1);
118 krb5_clear_error_message (context);
119 return KRB5_SENDAUTH_BADAUTHVERS;
120 }
121 }
122
123 n = krb5_net_read (context, p_fd, &len, 4);
124 if (n < 0) {
125 ret = errno;
126 krb5_set_error_message(context, ret, "read: %s", strerror(ret));
127 return ret;
128 }
129 if (n == 0) {
130 krb5_clear_error_message (context);
131 return KRB5_SENDAUTH_BADAPPLVERS;
132 }
133 len = ntohl(len);
134 her_appl_version = malloc (len);
135 if (her_appl_version == NULL) {
136 repl = 2;
137 krb5_net_write (context, p_fd, &repl, 1);
138 krb5_set_error_message(context, ENOMEM,
139 N_("malloc: out of memory", ""));
140 return ENOMEM;
141 }
142 if (krb5_net_read (context, p_fd, her_appl_version, len) != len
143 || !(*match_appl_version)(match_data, her_appl_version)) {
144 repl = 2;
145 krb5_net_write (context, p_fd, &repl, 1);
146 krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS,
147 N_("wrong sendauth version (%s)", ""),
148 her_appl_version);
149 free (her_appl_version);
150 return KRB5_SENDAUTH_BADAPPLVERS;
151 }
152 free (her_appl_version);
153
154 repl = 0;
155 if (krb5_net_write (context, p_fd, &repl, 1) != 1) {
156 ret = errno;
157 krb5_set_error_message(context, ret, "write: %s", strerror(ret));
158 return ret;
159 }
160
161 krb5_data_zero (&data);
162 ret = krb5_read_message (context, p_fd, &data);
163 if (ret)
164 return ret;
165
166 ret = krb5_rd_req (context,
167 auth_context,
168 &data,
169 server,
170 keytab,
171 &ap_options,
172 ticket);
173 krb5_data_free (&data);
174 if (ret) {
175 krb5_data error_data;
176 krb5_error_code ret2;
177
178 ret2 = krb5_mk_error (context,
179 ret,
180 NULL,
181 NULL,
182 NULL,
183 server,
184 NULL,
185 NULL,
186 &error_data);
187 if (ret2 == 0) {
188 krb5_write_message (context, p_fd, &error_data);
189 krb5_data_free (&error_data);
190 }
191 return ret;
192 }
193
194 len = 0;
195 if (krb5_net_write (context, p_fd, &len, 4) != 4) {
196 ret = errno;
197 krb5_set_error_message(context, ret, "write: %s", strerror(ret));
198 krb5_free_ticket(context, *ticket);
199 *ticket = NULL;
200 return ret;
201 }
202
203 if (ap_options & AP_OPTS_MUTUAL_REQUIRED) {
204 ret = krb5_mk_rep (context, *auth_context, &data);
205 if (ret) {
206 krb5_free_ticket(context, *ticket);
207 *ticket = NULL;
208 return ret;
209 }
210
211 ret = krb5_write_message (context, p_fd, &data);
212 if (ret) {
213 krb5_free_ticket(context, *ticket);
214 *ticket = NULL;
215 return ret;
216 }
217 krb5_data_free (&data);
218 }
219 return 0;
220}
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