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aa9f6a6e | 1 | /* |
2 | * Kerberos v5 authentication and ticket-passing routines. | |
762715ce | 3 | * |
aa9f6a6e | 4 | * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ |
aa9f6a6e | 5 | */ |
bb15f28b | 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 | */ | |
aa9f6a6e | 29 | |
30 | #include "includes.h" | |
93c3b6de | 31 | |
aa9f6a6e | 32 | #include "ssh.h" |
33 | #include "ssh1.h" | |
34 | #include "packet.h" | |
35 | #include "xmalloc.h" | |
36 | #include "log.h" | |
37 | #include "servconf.h" | |
38 | #include "uidswap.h" | |
39 | #include "auth.h" | |
40 | ||
41 | #ifdef KRB5 | |
42 | #include <krb5.h> | |
43 | ||
44 | extern ServerOptions options; | |
45 | ||
46 | static int | |
47 | krb5_init(void *context) | |
48 | { | |
49 | Authctxt *authctxt = (Authctxt *)context; | |
50 | krb5_error_code problem; | |
a0105740 | 51 | |
aa9f6a6e | 52 | if (authctxt->krb5_ctx == NULL) { |
53 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
54 | if (problem) | |
55 | return (problem); | |
aa9f6a6e | 56 | } |
aa9f6a6e | 57 | return (0); |
58 | } | |
59 | ||
aa9f6a6e | 60 | int |
61 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
62 | { | |
12928e80 | 63 | #ifndef HEIMDAL |
64 | krb5_creds creds; | |
65 | krb5_principal server; | |
b6453d99 | 66 | #endif |
aa9f6a6e | 67 | krb5_error_code problem; |
78e43412 | 68 | krb5_ccache ccache = NULL; |
6490a5d5 | 69 | int len; |
a0105740 | 70 | |
aa9f6a6e | 71 | temporarily_use_uid(authctxt->pw); |
a0105740 | 72 | |
aa9f6a6e | 73 | problem = krb5_init(authctxt); |
74 | if (problem) | |
75 | goto out; | |
a0105740 | 76 | |
aa9f6a6e | 77 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
78 | &authctxt->krb5_user); | |
79 | if (problem) | |
80 | goto out; | |
a0105740 | 81 | |
12928e80 | 82 | #ifdef HEIMDAL |
78e43412 | 83 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); |
aa9f6a6e | 84 | if (problem) |
85 | goto out; | |
a0105740 | 86 | |
78e43412 | 87 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
88 | authctxt->krb5_user); | |
aa9f6a6e | 89 | if (problem) |
90 | goto out; | |
a0105740 | 91 | |
92 | restore_uid(); | |
b6453d99 | 93 | |
aa9f6a6e | 94 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
78e43412 | 95 | ccache, password, 1, NULL); |
b6453d99 | 96 | |
a0105740 | 97 | temporarily_use_uid(authctxt->pw); |
98 | ||
aa9f6a6e | 99 | if (problem) |
100 | goto out; | |
bd7af13d | 101 | |
78e43412 | 102 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, |
103 | &authctxt->krb5_fwd_ccache); | |
104 | if (problem) | |
105 | goto out; | |
106 | ||
107 | problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, | |
108 | authctxt->krb5_fwd_ccache); | |
109 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
110 | ccache = NULL; | |
111 | if (problem) | |
112 | goto out; | |
a0105740 | 113 | |
12928e80 | 114 | #else |
115 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, | |
116 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); | |
117 | if (problem) | |
118 | goto out; | |
119 | ||
120 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, | |
121 | KRB5_NT_SRV_HST, &server); | |
122 | if (problem) | |
123 | goto out; | |
124 | ||
125 | restore_uid(); | |
126 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, | |
127 | NULL, NULL, NULL); | |
128 | krb5_free_principal(authctxt->krb5_ctx, server); | |
129 | temporarily_use_uid(authctxt->pw); | |
130 | if (problem) | |
131 | goto out; | |
b6453d99 | 132 | |
aff51935 | 133 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, |
12928e80 | 134 | authctxt->pw->pw_name)) { |
875ec275 | 135 | problem = -1; |
12928e80 | 136 | goto out; |
aff51935 | 137 | } |
12928e80 | 138 | |
937eb918 | 139 | problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache); |
12928e80 | 140 | if (problem) |
141 | goto out; | |
142 | ||
143 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
144 | authctxt->krb5_user); | |
145 | if (problem) | |
146 | goto out; | |
b6453d99 | 147 | |
12928e80 | 148 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
149 | &creds); | |
150 | if (problem) | |
151 | goto out; | |
b6453d99 | 152 | #endif |
12928e80 | 153 | |
aa9f6a6e | 154 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
a0105740 | 155 | |
6490a5d5 | 156 | len = strlen(authctxt->krb5_ticket_file) + 6; |
157 | authctxt->krb5_ccname = xmalloc(len); | |
158 | snprintf(authctxt->krb5_ccname, len, "FILE:%s", | |
159 | authctxt->krb5_ticket_file); | |
160 | ||
ef084ee2 | 161 | #ifdef USE_PAM |
162 | if (options.use_pam) | |
163 | do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); | |
164 | #endif | |
165 | ||
aa9f6a6e | 166 | out: |
167 | restore_uid(); | |
a0105740 | 168 | |
aa9f6a6e | 169 | if (problem) { |
78e43412 | 170 | if (ccache) |
171 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
172 | ||
12928e80 | 173 | if (authctxt->krb5_ctx != NULL && problem!=-1) |
c12337d9 | 174 | debug("Kerberos password authentication failed: %s", |
175 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
176 | else | |
177 | debug("Kerberos password authentication failed: %d", | |
178 | problem); | |
a0105740 | 179 | |
aa9f6a6e | 180 | krb5_cleanup_proc(authctxt); |
a0105740 | 181 | |
aa9f6a6e | 182 | if (options.kerberos_or_local_passwd) |
183 | return (-1); | |
184 | else | |
185 | return (0); | |
186 | } | |
426cef74 | 187 | return (authctxt->valid ? 1 : 0); |
aa9f6a6e | 188 | } |
189 | ||
190 | void | |
2362db19 | 191 | krb5_cleanup_proc(Authctxt *authctxt) |
aa9f6a6e | 192 | { |
aa9f6a6e | 193 | debug("krb5_cleanup_proc called"); |
194 | if (authctxt->krb5_fwd_ccache) { | |
195 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
196 | authctxt->krb5_fwd_ccache = NULL; | |
197 | } | |
198 | if (authctxt->krb5_user) { | |
199 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
200 | authctxt->krb5_user = NULL; | |
201 | } | |
aa9f6a6e | 202 | if (authctxt->krb5_ctx) { |
203 | krb5_free_context(authctxt->krb5_ctx); | |
204 | authctxt->krb5_ctx = NULL; | |
205 | } | |
206 | } | |
207 | ||
937eb918 | 208 | #ifndef HEIMDAL |
209 | krb5_error_code | |
210 | ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) { | |
211 | int tmpfd, ret; | |
212 | char ccname[40]; | |
213 | mode_t old_umask; | |
214 | ||
215 | ret = snprintf(ccname, sizeof(ccname), | |
216 | "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid()); | |
c080bed1 | 217 | if (ret < 0 || (size_t)ret >= sizeof(ccname)) |
6f602461 | 218 | return ENOMEM; |
937eb918 | 219 | |
220 | old_umask = umask(0177); | |
221 | tmpfd = mkstemp(ccname + strlen("FILE:")); | |
222 | umask(old_umask); | |
223 | if (tmpfd == -1) { | |
224 | logit("mkstemp(): %.100s", strerror(errno)); | |
225 | return errno; | |
226 | } | |
227 | ||
228 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
229 | logit("fchmod(): %.100s", strerror(errno)); | |
230 | close(tmpfd); | |
231 | return errno; | |
232 | } | |
233 | close(tmpfd); | |
234 | ||
235 | return (krb5_cc_resolve(ctx, ccname, ccache)); | |
236 | } | |
237 | #endif /* !HEIMDAL */ | |
aa9f6a6e | 238 | #endif /* KRB5 */ |