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3c0ef626 | 1 | /* |
2 | * Kerberos v5 authentication and ticket-passing routines. | |
350391c5 | 3 | * |
3c0ef626 | 4 | * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ |
3c0ef626 | 5 | */ |
350391c5 | 6 | /* |
7 | * Copyright (c) 2002 Daniel Kouril. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
3c0ef626 | 29 | |
30 | #include "includes.h" | |
540d72c3 | 31 | RCSID("$OpenBSD: auth-krb5.c,v 1.15 2003/11/21 11:57:02 djm Exp $"); |
e9702f7d | 32 | |
3c0ef626 | 33 | #include "ssh.h" |
34 | #include "ssh1.h" | |
35 | #include "packet.h" | |
36 | #include "xmalloc.h" | |
37 | #include "log.h" | |
38 | #include "servconf.h" | |
39 | #include "uidswap.h" | |
40 | #include "auth.h" | |
41 | ||
42 | #ifdef KRB5 | |
43 | #include <krb5.h> | |
44 | ||
45 | extern ServerOptions options; | |
46 | ||
47 | static int | |
48 | krb5_init(void *context) | |
49 | { | |
50 | Authctxt *authctxt = (Authctxt *)context; | |
51 | krb5_error_code problem; | |
e9702f7d | 52 | |
3c0ef626 | 53 | if (authctxt->krb5_ctx == NULL) { |
54 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
55 | if (problem) | |
56 | return (problem); | |
3c0ef626 | 57 | } |
3c0ef626 | 58 | return (0); |
59 | } | |
60 | ||
3c0ef626 | 61 | int |
62 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
63 | { | |
63119dd9 | 64 | #ifndef HEIMDAL |
e444f4cb | 65 | krb5_creds creds; |
63119dd9 | 66 | krb5_principal server; |
540d72c3 | 67 | #endif |
3c0ef626 | 68 | krb5_error_code problem; |
7cac2b65 | 69 | krb5_ccache ccache = NULL; |
12a403af | 70 | int len; |
e9702f7d | 71 | |
540d72c3 | 72 | if (!authctxt->valid) |
3c0ef626 | 73 | return (0); |
e9702f7d | 74 | |
3c0ef626 | 75 | temporarily_use_uid(authctxt->pw); |
e9702f7d | 76 | |
3c0ef626 | 77 | problem = krb5_init(authctxt); |
78 | if (problem) | |
79 | goto out; | |
e9702f7d | 80 | |
3c0ef626 | 81 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
82 | &authctxt->krb5_user); | |
83 | if (problem) | |
84 | goto out; | |
905081a4 | 85 | |
86 | #ifdef HEIMDAL | |
7cac2b65 | 87 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); |
3c0ef626 | 88 | if (problem) |
89 | goto out; | |
e9702f7d | 90 | |
7cac2b65 | 91 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
92 | authctxt->krb5_user); | |
3c0ef626 | 93 | if (problem) |
94 | goto out; | |
905081a4 | 95 | |
e9702f7d | 96 | restore_uid(); |
540d72c3 | 97 | |
3c0ef626 | 98 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
7cac2b65 | 99 | ccache, password, 1, NULL); |
540d72c3 | 100 | |
e444f4cb | 101 | temporarily_use_uid(authctxt->pw); |
102 | ||
103 | if (problem) | |
3c0ef626 | 104 | goto out; |
540d72c3 | 105 | |
7cac2b65 | 106 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, |
107 | &authctxt->krb5_fwd_ccache); | |
108 | if (problem) | |
109 | goto out; | |
110 | ||
111 | problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, | |
112 | authctxt->krb5_fwd_ccache); | |
113 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
114 | ccache = NULL; | |
115 | if (problem) | |
116 | goto out; | |
e444f4cb | 117 | |
63119dd9 | 118 | #else |
905081a4 | 119 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, |
e444f4cb | 120 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); |
121 | if (problem) | |
905081a4 | 122 | goto out; |
e444f4cb | 123 | |
905081a4 | 124 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, |
125 | KRB5_NT_SRV_HST, &server); | |
e444f4cb | 126 | if (problem) |
905081a4 | 127 | goto out; |
e444f4cb | 128 | |
129 | restore_uid(); | |
905081a4 | 130 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, |
131 | NULL, NULL, NULL); | |
905081a4 | 132 | krb5_free_principal(authctxt->krb5_ctx, server); |
63119dd9 | 133 | temporarily_use_uid(authctxt->pw); |
e444f4cb | 134 | if (problem) |
135 | goto out; | |
540d72c3 | 136 | |
137 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
e444f4cb | 138 | authctxt->pw->pw_name)) { |
44a053a3 | 139 | problem = -1; |
e444f4cb | 140 | goto out; |
540d72c3 | 141 | } |
e444f4cb | 142 | |
2ce0bfe4 | 143 | problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache); |
e444f4cb | 144 | if (problem) |
145 | goto out; | |
63119dd9 | 146 | |
e444f4cb | 147 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
148 | authctxt->krb5_user); | |
905081a4 | 149 | if (problem) |
150 | goto out; | |
540d72c3 | 151 | |
e444f4cb | 152 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
153 | &creds); | |
154 | if (problem) | |
155 | goto out; | |
540d72c3 | 156 | #endif |
63119dd9 | 157 | |
3c0ef626 | 158 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
e9702f7d | 159 | |
12a403af | 160 | len = strlen(authctxt->krb5_ticket_file) + 6; |
161 | authctxt->krb5_ccname = xmalloc(len); | |
162 | snprintf(authctxt->krb5_ccname, len, "FILE:%s", | |
163 | authctxt->krb5_ticket_file); | |
164 | ||
dfddba3d | 165 | #ifdef USE_PAM |
166 | if (options.use_pam) | |
167 | do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); | |
168 | #endif | |
169 | ||
3c0ef626 | 170 | out: |
171 | restore_uid(); | |
e9702f7d | 172 | |
3c0ef626 | 173 | if (problem) { |
7cac2b65 | 174 | if (ccache) |
175 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
176 | ||
e444f4cb | 177 | if (authctxt->krb5_ctx != NULL && problem!=-1) |
e9702f7d | 178 | debug("Kerberos password authentication failed: %s", |
179 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
180 | else | |
181 | debug("Kerberos password authentication failed: %d", | |
182 | problem); | |
183 | ||
3c0ef626 | 184 | krb5_cleanup_proc(authctxt); |
e9702f7d | 185 | |
3c0ef626 | 186 | if (options.kerberos_or_local_passwd) |
187 | return (-1); | |
188 | else | |
189 | return (0); | |
190 | } | |
191 | return (1); | |
192 | } | |
193 | ||
194 | void | |
540d72c3 | 195 | krb5_cleanup_proc(Authctxt *authctxt) |
3c0ef626 | 196 | { |
3c0ef626 | 197 | debug("krb5_cleanup_proc called"); |
198 | if (authctxt->krb5_fwd_ccache) { | |
199 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
200 | authctxt->krb5_fwd_ccache = NULL; | |
201 | } | |
202 | if (authctxt->krb5_user) { | |
203 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
204 | authctxt->krb5_user = NULL; | |
205 | } | |
3c0ef626 | 206 | if (authctxt->krb5_ctx) { |
207 | krb5_free_context(authctxt->krb5_ctx); | |
208 | authctxt->krb5_ctx = NULL; | |
209 | } | |
210 | } | |
211 | ||
2ce0bfe4 | 212 | #ifndef HEIMDAL |
213 | krb5_error_code | |
214 | ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) { | |
215 | int tmpfd, ret; | |
216 | char ccname[40]; | |
217 | mode_t old_umask; | |
218 | ||
219 | ret = snprintf(ccname, sizeof(ccname), | |
220 | "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid()); | |
221 | if (ret == -1 || ret >= sizeof(ccname)) | |
222 | return ENOMEM; | |
223 | ||
224 | old_umask = umask(0177); | |
225 | tmpfd = mkstemp(ccname + strlen("FILE:")); | |
226 | umask(old_umask); | |
227 | if (tmpfd == -1) { | |
228 | logit("mkstemp(): %.100s", strerror(errno)); | |
229 | return errno; | |
230 | } | |
231 | ||
232 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
233 | logit("fchmod(): %.100s", strerror(errno)); | |
234 | close(tmpfd); | |
235 | return errno; | |
236 | } | |
237 | close(tmpfd); | |
238 | ||
239 | return (krb5_cc_resolve(ctx, ccname, ccache)); | |
240 | } | |
241 | #endif /* !HEIMDAL */ | |
3c0ef626 | 242 | #endif /* KRB5 */ |