1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/*
* Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
/*
* The format seems to be:
* client -> server
*
* 4 bytes - length
* KRB5_SENDAUTH_V1.0 (including zero)
* 4 bytes - length
* protocol string (with terminating zero)
*
* server -> client
* 1 byte - (0 = OK, else some kind of error)
*
* client -> server
* 4 bytes - length
* AP-REQ
*
* server -> client
* 4 bytes - length (0 = OK, else length of error)
* (error)
*
* if(mutual) {
* server -> client
* 4 bytes - length
* AP-REP
* }
*/
/**
* Perform the client side of the sendauth protocol.
*
* @param context Kerberos 5 context.
* @param auth_context Authentication context of the peer.
* @param p_fd Socket associated to the connection.
* @param appl_version Server-specific string.
* @param client Client principal. If NULL, use the credentials in \a ccache.
* @param server Server principal.
* @param ap_req_options Options for the AP_REQ message. See the AP_OPTS_* defines in krb5.h.
* @param in_data FIXME
* @param in_creds FIXME
* @param ccache Credentials cache. If NULL, use the default credentials cache.
* @param ret_error If not NULL, will be set to the error reported by server, if any.
* Must be deallocated with krb5_free_error_contents().
* @param rep_result If not NULL, will be set to the EncApRepPart of the AP_REP message.
* Must be deallocated with krb5_free_ap_rep_enc_part().
* @param out_creds FIXME If not NULL, will be set to FIXME. Must be deallocated with
* krb5_free_creds().
*
* @return 0 to indicate success. Otherwise a Kerberos error code is
* returned, see krb5_get_error_message().
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_sendauth(krb5_context context,
krb5_auth_context *auth_context,
krb5_pointer p_fd,
const char *appl_version,
krb5_principal client,
krb5_principal server,
krb5_flags ap_req_options,
krb5_data *in_data,
krb5_creds *in_creds,
krb5_ccache ccache,
krb5_error **ret_error,
krb5_ap_rep_enc_part **rep_result,
krb5_creds **out_creds)
{
krb5_error_code ret;
uint32_t len, net_len;
const char *version = KRB5_SENDAUTH_VERSION;
u_char repl;
krb5_data ap_req, error_data;
krb5_creds this_cred;
krb5_principal this_client = NULL;
krb5_creds *creds;
ssize_t sret;
krb5_boolean my_ccache = FALSE;
len = strlen(version) + 1;
net_len = htonl(len);
if (krb5_net_write (context, p_fd, &net_len, 4) != 4
|| krb5_net_write (context, p_fd, version, len) != len) {
ret = errno;
krb5_set_error_message (context, ret, "write: %s", strerror(ret));
return ret;
}
len = strlen(appl_version) + 1;
net_len = htonl(len);
if (krb5_net_write (context, p_fd, &net_len, 4) != 4
|| krb5_net_write (context, p_fd, appl_version, len) != len) {
ret = errno;
krb5_set_error_message (context, ret, "write: %s", strerror(ret));
return ret;
}
sret = krb5_net_read (context, p_fd, &repl, sizeof(repl));
if (sret < 0) {
ret = errno;
krb5_set_error_message (context, ret, "read: %s", strerror(ret));
return ret;
} else if (sret != sizeof(repl)) {
krb5_clear_error_message (context);
return KRB5_SENDAUTH_BADRESPONSE;
}
if (repl != 0) {
krb5_clear_error_message (context);
return KRB5_SENDAUTH_REJECTED;
}
if (in_creds == NULL) {
if (ccache == NULL) {
ret = krb5_cc_default (context, &ccache);
if (ret)
return ret;
my_ccache = TRUE;
}
if (client == NULL) {
ret = krb5_cc_get_principal (context, ccache, &this_client);
if (ret) {
if(my_ccache)
krb5_cc_close(context, ccache);
return ret;
}
client = this_client;
}
memset(&this_cred, 0, sizeof(this_cred));
this_cred.client = client;
this_cred.server = server;
this_cred.times.endtime = 0;
this_cred.ticket.length = 0;
in_creds = &this_cred;
}
if (in_creds->ticket.length == 0) {
ret = krb5_get_credentials (context, 0, ccache, in_creds, &creds);
if (ret) {
if(my_ccache)
krb5_cc_close(context, ccache);
return ret;
}
} else {
creds = in_creds;
}
if(my_ccache)
krb5_cc_close(context, ccache);
ret = krb5_mk_req_extended (context,
auth_context,
ap_req_options,
in_data,
creds,
&ap_req);
if (out_creds)
*out_creds = creds;
else
krb5_free_creds(context, creds);
if(this_client)
krb5_free_principal(context, this_client);
if (ret)
return ret;
ret = krb5_write_message (context,
p_fd,
&ap_req);
if (ret)
return ret;
krb5_data_free (&ap_req);
ret = krb5_read_message (context, p_fd, &error_data);
if (ret)
return ret;
if (error_data.length != 0) {
KRB_ERROR error;
ret = krb5_rd_error (context, &error_data, &error);
krb5_data_free (&error_data);
if (ret == 0) {
ret = krb5_error_from_rd_error(context, &error, NULL);
if (ret_error != NULL) {
*ret_error = malloc (sizeof(krb5_error));
if (*ret_error == NULL) {
krb5_free_error_contents (context, &error);
} else {
**ret_error = error;
}
} else {
krb5_free_error_contents (context, &error);
}
return ret;
} else {
krb5_clear_error_message(context);
return ret;
}
} else
krb5_data_free (&error_data);
if (ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
krb5_data ap_rep;
krb5_ap_rep_enc_part *ignore = NULL;
krb5_data_zero (&ap_rep);
ret = krb5_read_message (context,
p_fd,
&ap_rep);
if (ret)
return ret;
ret = krb5_rd_rep (context, *auth_context, &ap_rep,
rep_result ? rep_result : &ignore);
krb5_data_free (&ap_rep);
if (ret)
return ret;
if (rep_result == NULL)
krb5_free_ap_rep_enc_part (context, ignore);
}
return 0;
}
|