1 /*
2 * Copyright (c) 1998 - 2001 Kungliga Tekniska H�gskolan
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 "ftpd_locl.h"
35 #include <gssapi.h>
36 #include <krb5.h>
37
38 RCSID("$Id: gss_userok.c 21222 2007-06-20 10:11:14Z lha $");
39
40 /* XXX a bit too much of krb5 dependency here...
41 What is the correct way to do this?
42 */
43
44 struct gss_krb5_data {
45 krb5_context context;
46 };
47
48 /* XXX sync with gssapi.c */
49 struct gss_data {
50 gss_ctx_id_t context_hdl;
51 char *client_name;
52 gss_cred_id_t delegated_cred_handle;
53 void *mech_data;
54 };
55
56 int gss_userok(void*, char*); /* to keep gcc happy */
57 int gss_session(void*, char*); /* to keep gcc happy */
58
59 int
gss_userok(void * app_data,char * username)60 gss_userok(void *app_data, char *username)
61 {
62 struct gss_data *data = app_data;
63 krb5_error_code ret;
64 krb5_principal client;
65 struct gss_krb5_data *kdata;
66
67 kdata = calloc(1, sizeof(struct gss_krb5_data));
68 if (kdata == NULL)
69 return 1;
70 data->mech_data = kdata;
71
72 ret = krb5_init_context(&(kdata->context));
73 if (ret) {
74 free(kdata);
75 return 1;
76 }
77
78 ret = krb5_parse_name(kdata->context, data->client_name, &client);
79 if(ret) {
80 krb5_free_context(kdata->context);
81 free(kdata);
82 return 1;
83 }
84 ret = krb5_kuserok(kdata->context, client, username);
85 if (!ret) {
86 krb5_free_principal(kdata->context, client);
87 krb5_free_context(kdata->context);
88 free(kdata);
89 return 1;
90 }
91
92 ret = 0;
93 krb5_free_principal(kdata->context, client);
94 return ret;
95 }
96
97 int
gss_session(void * app_data,char * username)98 gss_session(void *app_data, char *username)
99 {
100 struct gss_data *data = app_data;
101 krb5_error_code ret;
102 OM_uint32 minor_status;
103 struct gss_krb5_data *kdata;
104
105 ret = 0;
106
107 kdata = (struct gss_krb5_data *)(data->mech_data);
108
109 /* more of krb-depend stuff :-( */
110 /* gss_add_cred() ? */
111 if (data->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
112 krb5_ccache ccache = NULL;
113 const char* ticketfile;
114 struct passwd *kpw;
115
116 ret = krb5_cc_gen_new(kdata->context, &krb5_fcc_ops, &ccache);
117 if (ret)
118 goto fail;
119
120 ticketfile = krb5_cc_get_name(kdata->context, ccache);
121
122 ret = gss_krb5_copy_ccache(&minor_status,
123 data->delegated_cred_handle,
124 ccache);
125 if (ret) {
126 ret = 0;
127 goto fail;
128 }
129
130 do_destroy_tickets = 1;
131
132 kpw = getpwnam(username);
133
134 if (kpw == NULL) {
135 unlink(ticketfile);
136 ret = 1;
137 goto fail;
138 }
139
140 chown (ticketfile, kpw->pw_uid, kpw->pw_gid);
141
142 if (asprintf(&k5ccname, "FILE:%s", ticketfile) != -1) {
143 esetenv ("KRB5CCNAME", k5ccname, 1);
144 }
145 afslog(NULL, 1);
146 fail:
147 if (ccache)
148 krb5_cc_close(kdata->context, ccache);
149 }
150
151 gss_release_cred(&minor_status, &data->delegated_cred_handle);
152 krb5_free_context(kdata->context);
153 free(kdata);
154 return ret;
155 }
156