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Commit | Line | Data |
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aa9f6a6e | 1 | /* |
2 | * Kerberos v5 authentication and ticket-passing routines. | |
3 | * | |
4 | * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ | |
c12337d9 | 5 | * $OpenBSD: auth-krb5.c,v 1.5 2002/02/15 23:54:10 markus Exp $ |
aa9f6a6e | 6 | */ |
7 | ||
8 | #include "includes.h" | |
9 | #include "ssh.h" | |
10 | #include "ssh1.h" | |
11 | #include "packet.h" | |
12 | #include "xmalloc.h" | |
13 | #include "log.h" | |
14 | #include "servconf.h" | |
15 | #include "uidswap.h" | |
16 | #include "auth.h" | |
17 | ||
18 | #ifdef KRB5 | |
19 | #include <krb5.h> | |
20 | ||
21 | extern ServerOptions options; | |
22 | ||
23 | static int | |
24 | krb5_init(void *context) | |
25 | { | |
26 | Authctxt *authctxt = (Authctxt *)context; | |
27 | krb5_error_code problem; | |
28 | static int cleanup_registered = 0; | |
a0105740 | 29 | |
aa9f6a6e | 30 | if (authctxt->krb5_ctx == NULL) { |
31 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
32 | if (problem) | |
33 | return (problem); | |
34 | krb5_init_ets(authctxt->krb5_ctx); | |
35 | } | |
36 | if (!cleanup_registered) { | |
37 | fatal_add_cleanup(krb5_cleanup_proc, authctxt); | |
38 | cleanup_registered = 1; | |
39 | } | |
40 | return (0); | |
41 | } | |
42 | ||
43 | /* | |
44 | * Try krb5 authentication. server_user is passed for logging purposes | |
45 | * only, in auth is received ticket, in client is returned principal | |
46 | * from the ticket | |
47 | */ | |
a0105740 | 48 | int |
aa9f6a6e | 49 | auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client) |
50 | { | |
51 | krb5_error_code problem; | |
52 | krb5_principal server; | |
53 | krb5_data reply; | |
54 | krb5_ticket *ticket; | |
ede8cea6 | 55 | int fd, ret; |
56 | ||
57 | ret = 0; | |
aa9f6a6e | 58 | server = NULL; |
59 | ticket = NULL; | |
60 | reply.length = 0; | |
a0105740 | 61 | |
aa9f6a6e | 62 | problem = krb5_init(authctxt); |
a0105740 | 63 | if (problem) |
aa9f6a6e | 64 | goto err; |
a0105740 | 65 | |
aa9f6a6e | 66 | problem = krb5_auth_con_init(authctxt->krb5_ctx, |
67 | &authctxt->krb5_auth_ctx); | |
68 | if (problem) | |
69 | goto err; | |
a0105740 | 70 | |
aa9f6a6e | 71 | fd = packet_get_connection_in(); |
72 | problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx, | |
73 | authctxt->krb5_auth_ctx, &fd); | |
74 | if (problem) | |
75 | goto err; | |
a0105740 | 76 | |
aa9f6a6e | 77 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL , |
78 | KRB5_NT_SRV_HST, &server); | |
79 | if (problem) | |
80 | goto err; | |
a0105740 | 81 | |
aa9f6a6e | 82 | problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx, |
83 | auth, server, NULL, NULL, &ticket); | |
84 | if (problem) | |
85 | goto err; | |
a0105740 | 86 | |
aa9f6a6e | 87 | problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client, |
88 | &authctxt->krb5_user); | |
89 | if (problem) | |
90 | goto err; | |
a0105740 | 91 | |
aa9f6a6e | 92 | /* if client wants mutual auth */ |
93 | problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx, | |
94 | &reply); | |
95 | if (problem) | |
96 | goto err; | |
a0105740 | 97 | |
aa9f6a6e | 98 | /* Check .k5login authorization now. */ |
99 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
100 | authctxt->pw->pw_name)) | |
101 | goto err; | |
a0105740 | 102 | |
aa9f6a6e | 103 | if (client) |
104 | krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user, | |
105 | client); | |
a0105740 | 106 | |
aa9f6a6e | 107 | packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE); |
108 | packet_put_string((char *) reply.data, reply.length); | |
109 | packet_send(); | |
110 | packet_write_wait(); | |
ede8cea6 | 111 | |
112 | ret = 1; | |
aa9f6a6e | 113 | err: |
114 | if (server) | |
115 | krb5_free_principal(authctxt->krb5_ctx, server); | |
116 | if (ticket) | |
117 | krb5_free_ticket(authctxt->krb5_ctx, ticket); | |
118 | if (reply.length) | |
119 | xfree(reply.data); | |
a0105740 | 120 | |
c12337d9 | 121 | if (problem) { |
122 | if (authctxt->krb5_ctx != NULL) | |
123 | debug("Kerberos v5 authentication failed: %s", | |
124 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
125 | else | |
126 | debug("Kerberos v5 authentication failed: %d", | |
127 | problem); | |
128 | } | |
ede8cea6 | 129 | |
130 | return (ret); | |
aa9f6a6e | 131 | } |
132 | ||
133 | int | |
134 | auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt) | |
135 | { | |
136 | krb5_error_code problem; | |
137 | krb5_ccache ccache = NULL; | |
138 | char *pname; | |
a0105740 | 139 | |
aa9f6a6e | 140 | if (authctxt->pw == NULL || authctxt->krb5_user == NULL) |
141 | return (0); | |
a0105740 | 142 | |
aa9f6a6e | 143 | temporarily_use_uid(authctxt->pw); |
a0105740 | 144 | |
aa9f6a6e | 145 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache); |
146 | if (problem) | |
147 | goto fail; | |
a0105740 | 148 | |
aa9f6a6e | 149 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
150 | authctxt->krb5_user); | |
151 | if (problem) | |
152 | goto fail; | |
a0105740 | 153 | |
aa9f6a6e | 154 | problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx, |
155 | ccache, tgt); | |
156 | if (problem) | |
157 | goto fail; | |
a0105740 | 158 | |
aa9f6a6e | 159 | authctxt->krb5_fwd_ccache = ccache; |
160 | ccache = NULL; | |
a0105740 | 161 | |
aa9f6a6e | 162 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
a0105740 | 163 | |
aa9f6a6e | 164 | problem = krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user, |
165 | &pname); | |
166 | if (problem) | |
167 | goto fail; | |
a0105740 | 168 | |
aa9f6a6e | 169 | debug("Kerberos v5 TGT accepted (%s)", pname); |
a0105740 | 170 | |
aa9f6a6e | 171 | restore_uid(); |
a0105740 | 172 | |
aa9f6a6e | 173 | return (1); |
a0105740 | 174 | |
aa9f6a6e | 175 | fail: |
176 | if (problem) | |
177 | debug("Kerberos v5 TGT passing failed: %s", | |
178 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
179 | if (ccache) | |
180 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
a0105740 | 181 | |
aa9f6a6e | 182 | restore_uid(); |
a0105740 | 183 | |
aa9f6a6e | 184 | return (0); |
185 | } | |
186 | ||
187 | int | |
188 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
189 | { | |
190 | krb5_error_code problem; | |
a0105740 | 191 | |
aa9f6a6e | 192 | if (authctxt->pw == NULL) |
193 | return (0); | |
a0105740 | 194 | |
aa9f6a6e | 195 | temporarily_use_uid(authctxt->pw); |
a0105740 | 196 | |
aa9f6a6e | 197 | problem = krb5_init(authctxt); |
198 | if (problem) | |
199 | goto out; | |
a0105740 | 200 | |
aa9f6a6e | 201 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
202 | &authctxt->krb5_user); | |
203 | if (problem) | |
204 | goto out; | |
a0105740 | 205 | |
aa9f6a6e | 206 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, |
207 | &authctxt->krb5_fwd_ccache); | |
208 | if (problem) | |
209 | goto out; | |
a0105740 | 210 | |
aa9f6a6e | 211 | problem = krb5_cc_initialize(authctxt->krb5_ctx, |
212 | authctxt->krb5_fwd_ccache, authctxt->krb5_user); | |
213 | if (problem) | |
214 | goto out; | |
a0105740 | 215 | |
216 | restore_uid(); | |
aa9f6a6e | 217 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
218 | authctxt->krb5_fwd_ccache, password, 1, NULL); | |
a0105740 | 219 | temporarily_use_uid(authctxt->pw); |
220 | ||
aa9f6a6e | 221 | if (problem) |
222 | goto out; | |
a0105740 | 223 | |
aa9f6a6e | 224 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
a0105740 | 225 | |
aa9f6a6e | 226 | out: |
227 | restore_uid(); | |
a0105740 | 228 | |
aa9f6a6e | 229 | if (problem) { |
c12337d9 | 230 | if (authctxt->krb5_ctx != NULL) |
231 | debug("Kerberos password authentication failed: %s", | |
232 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
233 | else | |
234 | debug("Kerberos password authentication failed: %d", | |
235 | problem); | |
a0105740 | 236 | |
aa9f6a6e | 237 | krb5_cleanup_proc(authctxt); |
a0105740 | 238 | |
aa9f6a6e | 239 | if (options.kerberos_or_local_passwd) |
240 | return (-1); | |
241 | else | |
242 | return (0); | |
243 | } | |
244 | return (1); | |
245 | } | |
246 | ||
247 | void | |
248 | krb5_cleanup_proc(void *context) | |
249 | { | |
250 | Authctxt *authctxt = (Authctxt *)context; | |
a0105740 | 251 | |
aa9f6a6e | 252 | debug("krb5_cleanup_proc called"); |
253 | if (authctxt->krb5_fwd_ccache) { | |
254 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
255 | authctxt->krb5_fwd_ccache = NULL; | |
256 | } | |
257 | if (authctxt->krb5_user) { | |
258 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
259 | authctxt->krb5_user = NULL; | |
260 | } | |
261 | if (authctxt->krb5_auth_ctx) { | |
262 | krb5_auth_con_free(authctxt->krb5_ctx, | |
263 | authctxt->krb5_auth_ctx); | |
264 | authctxt->krb5_auth_ctx = NULL; | |
265 | } | |
266 | if (authctxt->krb5_ctx) { | |
267 | krb5_free_context(authctxt->krb5_ctx); | |
268 | authctxt->krb5_ctx = NULL; | |
269 | } | |
270 | } | |
271 | ||
272 | #endif /* KRB5 */ |