gss_userok.c revision 72445 
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
38RCSID("$Id: gss_userok.c,v 1.7 2001/01/30 00:36:58 assar Exp $");
39
40/* XXX a bit too much of krb5 dependency here...
41   What is the correct way to do this?
42   */
43
44extern krb5_context gssapi_krb5_context;
45
46/* XXX sync with gssapi.c */
47struct gss_data {
48    gss_ctx_id_t context_hdl;
49    char *client_name;
50    gss_cred_id_t delegated_cred_handle;
51};
52
53int gss_userok(void*, char*); /* to keep gcc happy */
54
55int
56gss_userok(void *app_data, char *username)
57{
58    struct gss_data *data = app_data;
59    if(gssapi_krb5_context) {
60	krb5_principal client;
61	krb5_error_code ret;
62
63	ret = krb5_parse_name(gssapi_krb5_context, data->client_name, &client);
64	if(ret)
65	    return 1;
66	ret = krb5_kuserok(gssapi_krb5_context, client, username);
67        if (!ret) {
68           krb5_free_principal(gssapi_krb5_context, client);
69           return 1;
70        }
71
72        ret = 0;
73
74        /* more of krb-depend stuff :-( */
75	/* gss_add_cred() ? */
76        if (data->delegated_cred_handle &&
77            data->delegated_cred_handle->ccache ) {
78
79           krb5_ccache ccache = NULL;
80           char* ticketfile;
81           struct passwd *pw;
82	   OM_uint32 minor_status;
83
84           pw = getpwnam(username);
85
86	   if (pw == NULL) {
87	       ret = 1;
88	       goto fail;
89	   }
90
91           asprintf (&ticketfile, "%s%u", KRB5_DEFAULT_CCROOT, pw->pw_uid);
92
93           ret = krb5_cc_resolve(gssapi_krb5_context, ticketfile, &ccache);
94           if (ret)
95              goto fail;
96
97           ret = gss_krb5_copy_ccache(&minor_status,
98				      data->delegated_cred_handle,
99				      ccache);
100           if (ret)
101              goto fail;
102
103           chown (ticketfile+5, pw->pw_uid, pw->pw_gid);
104
105#ifdef KRB4
106           if (k_hasafs()) {
107              krb5_afslog(gssapi_krb5_context, ccache, 0, 0);
108           }
109#endif
110           esetenv ("KRB5CCNAME", ticketfile, 1);
111
112fail:
113           if (ccache)
114              krb5_cc_close(gssapi_krb5_context, ccache);
115           krb5_cc_destroy(gssapi_krb5_context,
116                           data->delegated_cred_handle->ccache);
117           data->delegated_cred_handle->ccache = NULL;
118           free(ticketfile);
119        }
120
121	krb5_free_principal(gssapi_krb5_context, client);
122        return ret;
123    }
124    return 1;
125}
126