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 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
44struct gss_krb5_data {
45    krb5_context context;
46};
47
48/* XXX sync with gssapi.c */
49struct 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
56int gss_userok(void*, char*); /* to keep gcc happy */
57int gss_session(void*, char*); /* to keep gcc happy */
58
59int
60gss_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
97int
98gss_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