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1 | /* $OpenBSD: gss-serv-krb5.c,v 1.4 2005/10/13 19:08:08 stevesk Exp $ */ | |
2 | ||
3 | /* | |
4 | * Copyright (c) 2001-2003 Simon Wilkinson. 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 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
28 | ||
29 | #ifdef GSSAPI | |
30 | #ifdef KRB5 | |
31 | ||
32 | #include "auth.h" | |
33 | #include "xmalloc.h" | |
34 | #include "log.h" | |
35 | #include "servconf.h" | |
36 | ||
37 | #include "ssh-gss.h" | |
38 | ||
39 | extern ServerOptions options; | |
40 | ||
41 | #ifdef HEIMDAL | |
42 | # include <krb5.h> | |
43 | #else | |
44 | # ifdef HAVE_GSSAPI_KRB5 | |
45 | # include <gssapi_krb5.h> | |
46 | # elif HAVE_GSSAPI_GSSAPI_KRB5 | |
47 | # include <gssapi/gssapi_krb5.h> | |
48 | # endif | |
49 | #endif | |
50 | ||
51 | static krb5_context krb_context = NULL; | |
52 | ||
53 | /* Initialise the krb5 library, for the stuff that GSSAPI won't do */ | |
54 | ||
55 | static int | |
56 | ssh_gssapi_krb5_init(void) | |
57 | { | |
58 | krb5_error_code problem; | |
59 | ||
60 | if (krb_context != NULL) | |
61 | return 1; | |
62 | ||
63 | problem = krb5_init_context(&krb_context); | |
64 | if (problem) { | |
65 | logit("Cannot initialize krb5 context"); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
72 | /* Check if this user is OK to login. This only works with krb5 - other | |
73 | * GSSAPI mechanisms will need their own. | |
74 | * Returns true if the user is OK to log in, otherwise returns 0 | |
75 | */ | |
76 | ||
77 | static int | |
78 | ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name) | |
79 | { | |
80 | krb5_principal princ; | |
81 | int retval; | |
82 | ||
83 | if (ssh_gssapi_krb5_init() == 0) | |
84 | return 0; | |
85 | ||
86 | if ((retval = krb5_parse_name(krb_context, client->exportedname.value, | |
87 | &princ))) { | |
88 | logit("krb5_parse_name(): %.100s", | |
89 | krb5_get_err_text(krb_context, retval)); | |
90 | return 0; | |
91 | } | |
92 | if (krb5_kuserok(krb_context, princ, name)) { | |
93 | retval = 1; | |
94 | logit("Authorized to %s, krb5 principal %s (krb5_kuserok)", | |
95 | name, (char *)client->displayname.value); | |
96 | } else | |
97 | retval = 0; | |
98 | ||
99 | krb5_free_principal(krb_context, princ); | |
100 | return retval; | |
101 | } | |
102 | ||
103 | ||
104 | /* This writes out any forwarded credentials from the structure populated | |
105 | * during userauth. Called after we have setuid to the user */ | |
106 | ||
107 | static void | |
108 | ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client) | |
109 | { | |
110 | krb5_ccache ccache; | |
111 | krb5_error_code problem; | |
112 | krb5_principal princ; | |
113 | OM_uint32 maj_status, min_status; | |
114 | int len; | |
115 | ||
116 | if (client->creds == NULL) { | |
117 | debug("No credentials stored"); | |
118 | return; | |
119 | } | |
120 | ||
121 | if (ssh_gssapi_krb5_init() == 0) | |
122 | return; | |
123 | ||
124 | #ifdef HEIMDAL | |
125 | if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) { | |
126 | logit("krb5_cc_gen_new(): %.100s", | |
127 | krb5_get_err_text(krb_context, problem)); | |
128 | return; | |
129 | } | |
130 | #else | |
131 | if ((problem = ssh_krb5_cc_gen(krb_context, &ccache))) { | |
132 | logit("ssh_krb5_cc_gen(): %.100s", | |
133 | krb5_get_err_text(krb_context, problem)); | |
134 | return; | |
135 | } | |
136 | #endif /* #ifdef HEIMDAL */ | |
137 | ||
138 | if ((problem = krb5_parse_name(krb_context, | |
139 | client->exportedname.value, &princ))) { | |
140 | logit("krb5_parse_name(): %.100s", | |
141 | krb5_get_err_text(krb_context, problem)); | |
142 | krb5_cc_destroy(krb_context, ccache); | |
143 | return; | |
144 | } | |
145 | ||
146 | if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) { | |
147 | logit("krb5_cc_initialize(): %.100s", | |
148 | krb5_get_err_text(krb_context, problem)); | |
149 | krb5_free_principal(krb_context, princ); | |
150 | krb5_cc_destroy(krb_context, ccache); | |
151 | return; | |
152 | } | |
153 | ||
154 | krb5_free_principal(krb_context, princ); | |
155 | ||
156 | if ((maj_status = gss_krb5_copy_ccache(&min_status, | |
157 | client->creds, ccache))) { | |
158 | logit("gss_krb5_copy_ccache() failed"); | |
159 | krb5_cc_destroy(krb_context, ccache); | |
160 | return; | |
161 | } | |
162 | ||
163 | client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache)); | |
164 | client->store.envvar = "KRB5CCNAME"; | |
165 | len = strlen(client->store.filename) + 6; | |
166 | client->store.envval = xmalloc(len); | |
167 | snprintf(client->store.envval, len, "FILE:%s", client->store.filename); | |
168 | ||
169 | #ifdef USE_PAM | |
170 | if (options.use_pam) | |
171 | do_pam_putenv(client->store.envvar, client->store.envval); | |
172 | #endif | |
173 | ||
174 | krb5_cc_close(krb_context, ccache); | |
175 | ||
176 | return; | |
177 | } | |
178 | ||
179 | ssh_gssapi_mech gssapi_kerberos_mech = { | |
180 | "toWM5Slw5Ew8Mqkay+al2g==", | |
181 | "Kerberos", | |
182 | {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}, | |
183 | NULL, | |
184 | &ssh_gssapi_krb5_userok, | |
185 | NULL, | |
186 | &ssh_gssapi_krb5_storecreds | |
187 | }; | |
188 | ||
189 | #endif /* KRB5 */ | |
190 | ||
191 | #endif /* GSSAPI */ |