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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 $ | |
5 | * $OpenBSD: auth-krb5.c,v 1.1 2001/06/26 16:15:23 dugsong Exp $ | |
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; | |
29 | ||
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 | */ | |
48 | int | |
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; | |
55 | int fd; | |
56 | ||
57 | server = NULL; | |
58 | ticket = NULL; | |
59 | reply.length = 0; | |
60 | ||
61 | problem = krb5_init(authctxt); | |
62 | if (problem) | |
63 | goto err; | |
64 | ||
65 | problem = krb5_auth_con_init(authctxt->krb5_ctx, | |
66 | &authctxt->krb5_auth_ctx); | |
67 | if (problem) | |
68 | goto err; | |
69 | ||
70 | fd = packet_get_connection_in(); | |
71 | problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx, | |
72 | authctxt->krb5_auth_ctx, &fd); | |
73 | if (problem) | |
74 | goto err; | |
75 | ||
76 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL , | |
77 | KRB5_NT_SRV_HST, &server); | |
78 | if (problem) | |
79 | goto err; | |
80 | ||
81 | problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx, | |
82 | auth, server, NULL, NULL, &ticket); | |
83 | if (problem) | |
84 | goto err; | |
85 | ||
86 | problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client, | |
87 | &authctxt->krb5_user); | |
88 | if (problem) | |
89 | goto err; | |
90 | ||
91 | /* if client wants mutual auth */ | |
92 | problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx, | |
93 | &reply); | |
94 | if (problem) | |
95 | goto err; | |
96 | ||
97 | /* Check .k5login authorization now. */ | |
98 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
99 | authctxt->pw->pw_name)) | |
100 | goto err; | |
101 | ||
102 | if (client) | |
103 | krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user, | |
104 | client); | |
105 | ||
106 | packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE); | |
107 | packet_put_string((char *) reply.data, reply.length); | |
108 | packet_send(); | |
109 | packet_write_wait(); | |
110 | ||
111 | err: | |
112 | if (server) | |
113 | krb5_free_principal(authctxt->krb5_ctx, server); | |
114 | if (ticket) | |
115 | krb5_free_ticket(authctxt->krb5_ctx, ticket); | |
116 | if (reply.length) | |
117 | xfree(reply.data); | |
118 | ||
119 | if (problem) { | |
120 | debug("Kerberos v5 authentication failed: %s", | |
121 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
122 | return (0); | |
123 | } | |
124 | return (1); | |
125 | } | |
126 | ||
127 | int | |
128 | auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt) | |
129 | { | |
130 | krb5_error_code problem; | |
131 | krb5_ccache ccache = NULL; | |
132 | char *pname; | |
133 | ||
134 | if (authctxt->pw == NULL || authctxt->krb5_user == NULL) | |
135 | return (0); | |
136 | ||
137 | temporarily_use_uid(authctxt->pw); | |
138 | ||
139 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache); | |
140 | if (problem) | |
141 | goto fail; | |
142 | ||
143 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, | |
144 | authctxt->krb5_user); | |
145 | if (problem) | |
146 | goto fail; | |
147 | ||
148 | problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx, | |
149 | ccache, tgt); | |
150 | if (problem) | |
151 | goto fail; | |
152 | ||
153 | authctxt->krb5_fwd_ccache = ccache; | |
154 | ccache = NULL; | |
155 | ||
156 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
157 | ||
158 | problem = krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user, | |
159 | &pname); | |
160 | if (problem) | |
161 | goto fail; | |
162 | ||
163 | debug("Kerberos v5 TGT accepted (%s)", pname); | |
164 | ||
165 | restore_uid(); | |
166 | ||
167 | return (1); | |
168 | ||
169 | fail: | |
170 | if (problem) | |
171 | debug("Kerberos v5 TGT passing failed: %s", | |
172 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
173 | if (ccache) | |
174 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
175 | ||
176 | restore_uid(); | |
177 | ||
178 | return (0); | |
179 | } | |
180 | ||
181 | int | |
182 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
183 | { | |
184 | krb5_error_code problem; | |
185 | ||
186 | if (authctxt->pw == NULL) | |
187 | return (0); | |
188 | ||
189 | temporarily_use_uid(authctxt->pw); | |
190 | ||
191 | problem = krb5_init(authctxt); | |
192 | if (problem) | |
193 | goto out; | |
194 | ||
195 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, | |
196 | &authctxt->krb5_user); | |
197 | if (problem) | |
198 | goto out; | |
199 | ||
200 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, | |
201 | &authctxt->krb5_fwd_ccache); | |
202 | if (problem) | |
203 | goto out; | |
204 | ||
205 | problem = krb5_cc_initialize(authctxt->krb5_ctx, | |
206 | authctxt->krb5_fwd_ccache, authctxt->krb5_user); | |
207 | if (problem) | |
208 | goto out; | |
209 | ||
210 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, | |
211 | authctxt->krb5_fwd_ccache, password, 1, NULL); | |
212 | if (problem) | |
213 | goto out; | |
214 | ||
215 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
216 | ||
217 | out: | |
218 | restore_uid(); | |
219 | ||
220 | if (problem) { | |
221 | debug("Kerberos password authentication failed: %s", | |
222 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
223 | ||
224 | krb5_cleanup_proc(authctxt); | |
225 | ||
226 | if (options.kerberos_or_local_passwd) | |
227 | return (-1); | |
228 | else | |
229 | return (0); | |
230 | } | |
231 | return (1); | |
232 | } | |
233 | ||
234 | void | |
235 | krb5_cleanup_proc(void *context) | |
236 | { | |
237 | Authctxt *authctxt = (Authctxt *)context; | |
238 | ||
239 | debug("krb5_cleanup_proc called"); | |
240 | if (authctxt->krb5_fwd_ccache) { | |
241 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
242 | authctxt->krb5_fwd_ccache = NULL; | |
243 | } | |
244 | if (authctxt->krb5_user) { | |
245 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
246 | authctxt->krb5_user = NULL; | |
247 | } | |
248 | if (authctxt->krb5_auth_ctx) { | |
249 | krb5_auth_con_free(authctxt->krb5_ctx, | |
250 | authctxt->krb5_auth_ctx); | |
251 | authctxt->krb5_auth_ctx = NULL; | |
252 | } | |
253 | if (authctxt->krb5_ctx) { | |
254 | krb5_free_context(authctxt->krb5_ctx); | |
255 | authctxt->krb5_ctx = NULL; | |
256 | } | |
257 | } | |
258 | ||
259 | #endif /* KRB5 */ |