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9188927d | 1 | /* $OpenBSD: auth-krb5.c,v 1.18 2006/05/06 08:35:40 dtucker Exp $ */ |
aa9f6a6e | 2 | /* |
3 | * Kerberos v5 authentication and ticket-passing routines. | |
762715ce | 4 | * |
aa9f6a6e | 5 | * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ |
aa9f6a6e | 6 | */ |
bb15f28b | 7 | /* |
8 | * Copyright (c) 2002 Daniel Kouril. All rights reserved. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 | */ | |
aa9f6a6e | 30 | |
31 | #include "includes.h" | |
93c3b6de | 32 | |
aa9f6a6e | 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; | |
a0105740 | 52 | |
aa9f6a6e | 53 | if (authctxt->krb5_ctx == NULL) { |
54 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
55 | if (problem) | |
56 | return (problem); | |
aa9f6a6e | 57 | } |
aa9f6a6e | 58 | return (0); |
59 | } | |
60 | ||
aa9f6a6e | 61 | int |
62 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
63 | { | |
12928e80 | 64 | #ifndef HEIMDAL |
65 | krb5_creds creds; | |
66 | krb5_principal server; | |
b6453d99 | 67 | #endif |
aa9f6a6e | 68 | krb5_error_code problem; |
78e43412 | 69 | krb5_ccache ccache = NULL; |
6490a5d5 | 70 | int len; |
a0105740 | 71 | |
aa9f6a6e | 72 | temporarily_use_uid(authctxt->pw); |
a0105740 | 73 | |
aa9f6a6e | 74 | problem = krb5_init(authctxt); |
75 | if (problem) | |
76 | goto out; | |
a0105740 | 77 | |
aa9f6a6e | 78 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
79 | &authctxt->krb5_user); | |
80 | if (problem) | |
81 | goto out; | |
a0105740 | 82 | |
12928e80 | 83 | #ifdef HEIMDAL |
78e43412 | 84 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); |
aa9f6a6e | 85 | if (problem) |
86 | goto out; | |
a0105740 | 87 | |
78e43412 | 88 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
89 | authctxt->krb5_user); | |
aa9f6a6e | 90 | if (problem) |
91 | goto out; | |
a0105740 | 92 | |
93 | restore_uid(); | |
b6453d99 | 94 | |
aa9f6a6e | 95 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
78e43412 | 96 | ccache, password, 1, NULL); |
b6453d99 | 97 | |
a0105740 | 98 | temporarily_use_uid(authctxt->pw); |
99 | ||
aa9f6a6e | 100 | if (problem) |
101 | goto out; | |
bd7af13d | 102 | |
78e43412 | 103 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, |
104 | &authctxt->krb5_fwd_ccache); | |
105 | if (problem) | |
106 | goto out; | |
107 | ||
108 | problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, | |
109 | authctxt->krb5_fwd_ccache); | |
110 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
111 | ccache = NULL; | |
112 | if (problem) | |
113 | goto out; | |
a0105740 | 114 | |
12928e80 | 115 | #else |
116 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, | |
117 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); | |
118 | if (problem) | |
119 | goto out; | |
120 | ||
121 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, | |
122 | KRB5_NT_SRV_HST, &server); | |
123 | if (problem) | |
124 | goto out; | |
125 | ||
126 | restore_uid(); | |
127 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, | |
128 | NULL, NULL, NULL); | |
129 | krb5_free_principal(authctxt->krb5_ctx, server); | |
130 | temporarily_use_uid(authctxt->pw); | |
131 | if (problem) | |
132 | goto out; | |
b6453d99 | 133 | |
aff51935 | 134 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, |
12928e80 | 135 | authctxt->pw->pw_name)) { |
875ec275 | 136 | problem = -1; |
12928e80 | 137 | goto out; |
aff51935 | 138 | } |
12928e80 | 139 | |
937eb918 | 140 | problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache); |
12928e80 | 141 | if (problem) |
142 | goto out; | |
143 | ||
144 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
145 | authctxt->krb5_user); | |
146 | if (problem) | |
147 | goto out; | |
b6453d99 | 148 | |
12928e80 | 149 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
150 | &creds); | |
151 | if (problem) | |
152 | goto out; | |
b6453d99 | 153 | #endif |
12928e80 | 154 | |
aa9f6a6e | 155 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
a0105740 | 156 | |
6490a5d5 | 157 | len = strlen(authctxt->krb5_ticket_file) + 6; |
158 | authctxt->krb5_ccname = xmalloc(len); | |
159 | snprintf(authctxt->krb5_ccname, len, "FILE:%s", | |
160 | authctxt->krb5_ticket_file); | |
161 | ||
ef084ee2 | 162 | #ifdef USE_PAM |
163 | if (options.use_pam) | |
164 | do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); | |
165 | #endif | |
166 | ||
aa9f6a6e | 167 | out: |
168 | restore_uid(); | |
a0105740 | 169 | |
aa9f6a6e | 170 | if (problem) { |
78e43412 | 171 | if (ccache) |
172 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
173 | ||
12928e80 | 174 | if (authctxt->krb5_ctx != NULL && problem!=-1) |
c12337d9 | 175 | debug("Kerberos password authentication failed: %s", |
176 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
177 | else | |
178 | debug("Kerberos password authentication failed: %d", | |
179 | problem); | |
a0105740 | 180 | |
aa9f6a6e | 181 | krb5_cleanup_proc(authctxt); |
a0105740 | 182 | |
aa9f6a6e | 183 | if (options.kerberos_or_local_passwd) |
184 | return (-1); | |
185 | else | |
186 | return (0); | |
187 | } | |
426cef74 | 188 | return (authctxt->valid ? 1 : 0); |
aa9f6a6e | 189 | } |
190 | ||
191 | void | |
2362db19 | 192 | krb5_cleanup_proc(Authctxt *authctxt) |
aa9f6a6e | 193 | { |
aa9f6a6e | 194 | debug("krb5_cleanup_proc called"); |
195 | if (authctxt->krb5_fwd_ccache) { | |
196 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
197 | authctxt->krb5_fwd_ccache = NULL; | |
198 | } | |
199 | if (authctxt->krb5_user) { | |
200 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
201 | authctxt->krb5_user = NULL; | |
202 | } | |
aa9f6a6e | 203 | if (authctxt->krb5_ctx) { |
204 | krb5_free_context(authctxt->krb5_ctx); | |
205 | authctxt->krb5_ctx = NULL; | |
206 | } | |
207 | } | |
208 | ||
937eb918 | 209 | #ifndef HEIMDAL |
210 | krb5_error_code | |
211 | ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) { | |
212 | int tmpfd, ret; | |
213 | char ccname[40]; | |
214 | mode_t old_umask; | |
215 | ||
216 | ret = snprintf(ccname, sizeof(ccname), | |
217 | "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid()); | |
c080bed1 | 218 | if (ret < 0 || (size_t)ret >= sizeof(ccname)) |
6f602461 | 219 | return ENOMEM; |
937eb918 | 220 | |
221 | old_umask = umask(0177); | |
222 | tmpfd = mkstemp(ccname + strlen("FILE:")); | |
223 | umask(old_umask); | |
224 | if (tmpfd == -1) { | |
225 | logit("mkstemp(): %.100s", strerror(errno)); | |
226 | return errno; | |
227 | } | |
228 | ||
229 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
230 | logit("fchmod(): %.100s", strerror(errno)); | |
231 | close(tmpfd); | |
232 | return errno; | |
233 | } | |
234 | close(tmpfd); | |
235 | ||
236 | return (krb5_cc_resolve(ctx, ccname, ccache)); | |
237 | } | |
238 | #endif /* !HEIMDAL */ | |
aa9f6a6e | 239 | #endif /* KRB5 */ |