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d2e302d7 | 1 | /* $OpenBSD: gss-serv-krb5.c,v 1.3 2004/07/21 10:36:23 djm Exp $ */ |
7364bd04 | 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 | ||
749560dd | 41 | #ifdef HEIMDAL |
071970fb | 42 | # include <krb5.h> |
749560dd | 43 | #else |
071970fb | 44 | # ifdef HAVE_GSSAPI_KRB5 |
45 | # include <gssapi_krb5.h> | |
46 | # elif HAVE_GSSAPI_GSSAPI_KRB5 | |
47 | # include <gssapi/gssapi_krb5.h> | |
48 | # endif | |
749560dd | 49 | #endif |
7364bd04 | 50 | |
51 | static krb5_context krb_context = NULL; | |
52 | ||
53 | /* Initialise the krb5 library, for the stuff that GSSAPI won't do */ | |
54 | ||
aff51935 | 55 | static int |
d2e302d7 | 56 | ssh_gssapi_krb5_init(void) |
7364bd04 | 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 | } | |
79753592 | 68 | #ifdef KRB5_INIT_ETS |
7364bd04 | 69 | krb5_init_ets(krb_context); |
79753592 | 70 | #endif |
7364bd04 | 71 | |
72 | return 1; | |
73 | } | |
74 | ||
75 | /* Check if this user is OK to login. This only works with krb5 - other | |
76 | * GSSAPI mechanisms will need their own. | |
77 | * Returns true if the user is OK to log in, otherwise returns 0 | |
78 | */ | |
79 | ||
80 | static int | |
81 | ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name) | |
82 | { | |
83 | krb5_principal princ; | |
84 | int retval; | |
85 | ||
86 | if (ssh_gssapi_krb5_init() == 0) | |
87 | return 0; | |
88 | ||
89 | if ((retval = krb5_parse_name(krb_context, client->exportedname.value, | |
90 | &princ))) { | |
91 | logit("krb5_parse_name(): %.100s", | |
92 | krb5_get_err_text(krb_context, retval)); | |
93 | return 0; | |
94 | } | |
95 | if (krb5_kuserok(krb_context, princ, name)) { | |
96 | retval = 1; | |
97 | logit("Authorized to %s, krb5 principal %s (krb5_kuserok)", | |
98 | name, (char *)client->displayname.value); | |
99 | } else | |
100 | retval = 0; | |
101 | ||
102 | krb5_free_principal(krb_context, princ); | |
103 | return retval; | |
104 | } | |
105 | ||
106 | ||
107 | /* This writes out any forwarded credentials from the structure populated | |
108 | * during userauth. Called after we have setuid to the user */ | |
109 | ||
110 | static void | |
111 | ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client) | |
112 | { | |
113 | krb5_ccache ccache; | |
114 | krb5_error_code problem; | |
115 | krb5_principal princ; | |
116 | OM_uint32 maj_status, min_status; | |
5d464804 | 117 | int len; |
7364bd04 | 118 | |
119 | if (client->creds == NULL) { | |
120 | debug("No credentials stored"); | |
121 | return; | |
122 | } | |
123 | ||
124 | if (ssh_gssapi_krb5_init() == 0) | |
125 | return; | |
126 | ||
749560dd | 127 | #ifdef HEIMDAL |
7364bd04 | 128 | if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) { |
129 | logit("krb5_cc_gen_new(): %.100s", | |
130 | krb5_get_err_text(krb_context, problem)); | |
131 | return; | |
132 | } | |
749560dd | 133 | #else |
134 | { | |
135 | int tmpfd; | |
136 | char ccname[40]; | |
aff51935 | 137 | |
138 | snprintf(ccname, sizeof(ccname), | |
749560dd | 139 | "FILE:/tmp/krb5cc_%d_XXXXXX", geteuid()); |
aff51935 | 140 | |
749560dd | 141 | if ((tmpfd = mkstemp(ccname + strlen("FILE:"))) == -1) { |
142 | logit("mkstemp(): %.100s", strerror(errno)); | |
143 | problem = errno; | |
144 | return; | |
145 | } | |
146 | if (fchmod(tmpfd, S_IRUSR | S_IWUSR) == -1) { | |
147 | logit("fchmod(): %.100s", strerror(errno)); | |
148 | close(tmpfd); | |
149 | problem = errno; | |
150 | return; | |
151 | } | |
152 | close(tmpfd); | |
153 | if ((problem = krb5_cc_resolve(krb_context, ccname, &ccache))) { | |
154 | logit("krb5_cc_resolve(): %.100s", | |
155 | krb5_get_err_text(krb_context, problem)); | |
156 | return; | |
157 | } | |
158 | } | |
159 | #endif /* #ifdef HEIMDAL */ | |
7364bd04 | 160 | |
aff51935 | 161 | if ((problem = krb5_parse_name(krb_context, |
7364bd04 | 162 | client->exportedname.value, &princ))) { |
163 | logit("krb5_parse_name(): %.100s", | |
164 | krb5_get_err_text(krb_context, problem)); | |
165 | krb5_cc_destroy(krb_context, ccache); | |
166 | return; | |
167 | } | |
168 | ||
169 | if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) { | |
170 | logit("krb5_cc_initialize(): %.100s", | |
171 | krb5_get_err_text(krb_context, problem)); | |
172 | krb5_free_principal(krb_context, princ); | |
173 | krb5_cc_destroy(krb_context, ccache); | |
174 | return; | |
175 | } | |
176 | ||
177 | krb5_free_principal(krb_context, princ); | |
178 | ||
aff51935 | 179 | if ((maj_status = gss_krb5_copy_ccache(&min_status, |
7364bd04 | 180 | client->creds, ccache))) { |
181 | logit("gss_krb5_copy_ccache() failed"); | |
182 | krb5_cc_destroy(krb_context, ccache); | |
183 | return; | |
184 | } | |
185 | ||
186 | client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache)); | |
187 | client->store.envvar = "KRB5CCNAME"; | |
5d464804 | 188 | len = strlen(client->store.filename) + 6; |
189 | client->store.envval = xmalloc(len); | |
190 | snprintf(client->store.envval, len, "FILE:%s", client->store.filename); | |
7364bd04 | 191 | |
749560dd | 192 | #ifdef USE_PAM |
193 | if (options.use_pam) | |
5d464804 | 194 | do_pam_putenv(client->store.envvar, client->store.envval); |
749560dd | 195 | #endif |
196 | ||
7364bd04 | 197 | krb5_cc_close(krb_context, ccache); |
198 | ||
199 | return; | |
200 | } | |
201 | ||
202 | ssh_gssapi_mech gssapi_kerberos_mech = { | |
203 | "toWM5Slw5Ew8Mqkay+al2g==", | |
204 | "Kerberos", | |
205 | {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}, | |
206 | NULL, | |
207 | &ssh_gssapi_krb5_userok, | |
208 | NULL, | |
209 | &ssh_gssapi_krb5_storecreds | |
210 | }; | |
211 | ||
212 | #endif /* KRB5 */ | |
213 | ||
214 | #endif /* GSSAPI */ |