5 * - provides http_auth_backend_t "gssapi" for HTTP auth Basic realm="Kerberos"
6 * - provides http_auth_scheme_t "Negotiate"
7 * - (does not provide http_auth_backend_t for HTTP auth Digest)
9 * Note: Credentials cache (KRB5CCNAME) is exported into CGI and SSI environment
10 * as well as passed to FastCGI and SCGI (useful if on same machine
11 * and running under same user account with access to KRB5CCNAME file).
12 * Credentials are clean up at the end of each request.
15 * - no rate limiting of auth requests, so remote attacker can send many auth
16 * requests very quickly if attempting brute force password cracking attack
18 * FUTURE POTENTIAL PERFORMANCE ENHANCEMENTS:
19 * - Kerberos auth is synchronous and blocks waiting for response
20 * TODO: attempt async?
27 #include <gssapi/gssapi_krb5.h>
29 #include "http_auth.h"
41 buffer
*auth_gssapi_keytab
;
42 buffer
*auth_gssapi_principal
;
47 plugin_config
**config_storage
;
51 static handler_t
mod_authn_gssapi_check(server
*srv
, connection
*con
, void *p_d
, const struct http_auth_require_t
*require
, const struct http_auth_backend_t
*backend
);
52 static handler_t
mod_authn_gssapi_basic(server
*srv
, connection
*con
, void *p_d
, const http_auth_require_t
*require
, const buffer
*username
, const char *pw
);
54 INIT_FUNC(mod_authn_gssapi_init
) {
55 static http_auth_scheme_t http_auth_scheme_gssapi
=
56 { "gssapi", mod_authn_gssapi_check
, NULL
};
57 static http_auth_backend_t http_auth_backend_gssapi
=
58 { "gssapi", mod_authn_gssapi_basic
, NULL
, NULL
};
59 plugin_data
*p
= calloc(1, sizeof(*p
));
61 /* register http_auth_scheme_gssapi and http_auth_backend_gssapi */
62 http_auth_scheme_gssapi
.p_d
= p
;
63 http_auth_scheme_set(&http_auth_scheme_gssapi
);
64 http_auth_backend_gssapi
.p_d
= p
;
65 http_auth_backend_set(&http_auth_backend_gssapi
);
70 FREE_FUNC(mod_authn_gssapi_free
) {
75 if (!p
) return HANDLER_GO_ON
;
77 if (p
->config_storage
) {
79 for (i
= 0; i
< srv
->config_context
->used
; i
++) {
80 plugin_config
*s
= p
->config_storage
[i
];
82 if (NULL
== s
) continue;
84 buffer_free(s
->auth_gssapi_keytab
);
85 buffer_free(s
->auth_gssapi_principal
);
89 free(p
->config_storage
);
97 SETDEFAULTS_FUNC(mod_authn_gssapi_set_defaults
) {
100 config_values_t cv
[] = {
101 { "auth.backend.gssapi.keytab", NULL
, T_CONFIG_STRING
, T_CONFIG_SCOPE_CONNECTION
},
102 { "auth.backend.gssapi.principal", NULL
, T_CONFIG_STRING
, T_CONFIG_SCOPE_CONNECTION
},
103 { NULL
, NULL
, T_CONFIG_UNSET
, T_CONFIG_SCOPE_UNSET
}
106 p
->config_storage
= calloc(1, srv
->config_context
->used
* sizeof(plugin_config
*));
108 for (i
= 0; i
< srv
->config_context
->used
; i
++) {
109 data_config
const* config
= (data_config
const*)srv
->config_context
->data
[i
];
112 s
= calloc(1, sizeof(plugin_config
));
114 s
->auth_gssapi_keytab
= buffer_init();
115 s
->auth_gssapi_principal
= buffer_init();
117 cv
[0].destination
= s
->auth_gssapi_keytab
;
118 cv
[1].destination
= s
->auth_gssapi_principal
;
120 p
->config_storage
[i
] = s
;
122 if (0 != config_insert_values_global(srv
, config
->value
, cv
, i
== 0 ? T_CONFIG_SCOPE_SERVER
: T_CONFIG_SCOPE_CONNECTION
)) {
123 return HANDLER_ERROR
;
127 return HANDLER_GO_ON
;
132 static int mod_authn_gssapi_patch_connection(server
*srv
, connection
*con
, plugin_data
*p
)
135 plugin_config
*s
= p
->config_storage
[0];
137 PATCH(auth_gssapi_keytab
);
138 PATCH(auth_gssapi_principal
);
140 /* skip the first, the global context */
141 for (i
= 1; i
< srv
->config_context
->used
; i
++) {
142 data_config
*dc
= (data_config
*)srv
->config_context
->data
[i
];
143 s
= p
->config_storage
[i
];
145 /* condition didn't match */
146 if (!config_check_cond(srv
, con
, dc
)) continue;
149 for (j
= 0; j
< dc
->value
->used
; j
++) {
150 data_unset
*du
= dc
->value
->data
[j
];
152 if (buffer_is_equal_string(du
->key
, CONST_STR_LEN("auth.backend.gssapi.keytab"))) {
153 PATCH(auth_gssapi_keytab
);
154 } else if (buffer_is_equal_string(du
->key
, CONST_STR_LEN("auth.backend.gssapi.principal"))) {
155 PATCH(auth_gssapi_principal
);
164 static handler_t
mod_authn_gssapi_send_400_bad_request (server
*srv
, connection
*con
)
167 con
->http_status
= 400;
169 return HANDLER_FINISHED
;
172 static void mod_authn_gssapi_log_gss_error(server
*srv
, const char *file
, unsigned int line
, const char *func
, const char *extra
, OM_uint32 err_maj
, OM_uint32 err_min
)
174 buffer
* const msg
= buffer_init_string(func
);
175 OM_uint32 maj_stat
, min_stat
;
176 OM_uint32 msg_ctx
= 0;
177 gss_buffer_desc status_string
;
179 buffer_append_string_len(msg
, CONST_STR_LEN("("));
180 if (extra
) buffer_append_string(msg
, extra
);
181 buffer_append_string_len(msg
, CONST_STR_LEN("):"));
184 maj_stat
= gss_display_status(&min_stat
, err_maj
, GSS_C_GSS_CODE
,
185 GSS_C_NO_OID
, &msg_ctx
, &status_string
);
186 if (GSS_ERROR(maj_stat
))
189 buffer_append_string(msg
, status_string
.value
);
190 gss_release_buffer(&min_stat
, &status_string
);
192 maj_stat
= gss_display_status(&min_stat
, err_min
, GSS_C_MECH_CODE
,
193 GSS_C_NULL_OID
, &msg_ctx
, &status_string
);
194 if (!GSS_ERROR(maj_stat
)) {
195 buffer_append_string(msg
, " (");
196 buffer_append_string(msg
, status_string
.value
);
197 buffer_append_string(msg
, ")");
198 gss_release_buffer(&min_stat
, &status_string
);
200 } while (!GSS_ERROR(maj_stat
) && msg_ctx
!= 0);
202 log_error_write(srv
, file
, line
, "b", msg
);
206 static void mod_authn_gssapi_log_krb5_error(server
*srv
, const char *file
, unsigned int line
, const char *func
, const char *extra
, krb5_context context
, int code
)
209 /*(extra might be NULL)*/
210 log_error_write(srv
, file
, line
, "sssss", func
, "(", extra
, "):",
211 error_message(code
));
214 static int mod_authn_gssapi_create_krb5_ccache(server
*srv
, connection
*con
, plugin_data
*p
, krb5_context kcontext
, krb5_principal princ
, krb5_ccache
*ccache
)
216 buffer
* const kccname
= buffer_init_string("FILE:/tmp/krb5cc_gssapi_XXXXXX");
217 char * const ccname
= kccname
->ptr
+ sizeof("FILE:")-1;
218 const size_t ccnamelen
= buffer_string_length(kccname
)-(sizeof("FILE:")-1);
219 /*(future: might consider using server.upload-dirs instead of /tmp)*/
220 /* coverity[secure_temp : FALSE] */
221 int fd
= mkstemp(ccname
);
223 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "mkstemp():", strerror(errno
));
224 buffer_free(kccname
);
230 krb5_error_code problem
;
232 problem
= krb5_cc_resolve(kcontext
, kccname
->ptr
, ccache
);
234 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_resolve", NULL
, kcontext
, problem
);
238 problem
= krb5_cc_initialize(kcontext
, *ccache
, princ
);
240 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_initialize", kccname
->ptr
, kcontext
, problem
);
244 con
->plugin_ctx
[p
->id
] = kccname
;
246 array_set_key_value(con
->environment
, CONST_STR_LEN("KRB5CCNAME"), ccname
, ccnamelen
);
247 array_set_key_value(con
->request
.headers
, CONST_STR_LEN("X-Forwarded-Keytab"), ccname
, ccnamelen
);
254 krb5_cc_destroy(kcontext
, *ccache
);
258 buffer_free(kccname
);
264 * HTTP auth Negotiate
267 static handler_t
mod_authn_gssapi_send_401_unauthorized_negotiate (server
*srv
, connection
*con
)
269 con
->http_status
= 401;
271 response_header_insert(srv
, con
, CONST_STR_LEN("WWW-Authenticate"), CONST_STR_LEN("Negotiate"));
272 return HANDLER_FINISHED
;
275 static int mod_authn_gssapi_store_gss_creds(server
*srv
, connection
*con
, plugin_data
*p
, char *princ_name
, gss_cred_id_t delegated_cred
)
277 OM_uint32 maj_stat
, min_stat
;
278 krb5_principal princ
= NULL
;
279 krb5_ccache ccache
= NULL
;
280 krb5_error_code problem
;
281 krb5_context context
;
283 problem
= krb5_init_context(&context
);
285 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_init_context", NULL
, context
, problem
);
289 problem
= krb5_parse_name(context
, princ_name
, &princ
);
291 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", NULL
, context
, problem
);
295 if (mod_authn_gssapi_create_krb5_ccache(srv
, con
, p
, context
, princ
, &ccache
))
298 maj_stat
= gss_krb5_copy_ccache(&min_stat
, delegated_cred
, ccache
);
299 if (GSS_ERROR(maj_stat
)) {
300 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_krb5_copy_ccache", princ_name
, maj_stat
, min_stat
);
304 krb5_cc_close(context
, ccache
);
305 krb5_free_principal(context
, princ
);
306 krb5_free_context(context
);
311 krb5_free_principal(context
, princ
);
313 krb5_cc_destroy(context
, ccache
);
314 krb5_free_context(context
);
319 static handler_t
mod_authn_gssapi_check_spnego(server
*srv
, connection
*con
, plugin_data
*p
, const http_auth_require_t
*require
, const char *realm_str
)
321 OM_uint32 st_major
, st_minor
, acc_flags
;
322 gss_buffer_desc token_s
= GSS_C_EMPTY_BUFFER
;
323 gss_buffer_desc token_in
= GSS_C_EMPTY_BUFFER
;
324 gss_buffer_desc token_out
= GSS_C_EMPTY_BUFFER
;
325 gss_cred_id_t server_cred
= GSS_C_NO_CREDENTIAL
;
326 gss_cred_id_t client_cred
= GSS_C_NO_CREDENTIAL
;
327 gss_ctx_id_t context
= GSS_C_NO_CONTEXT
;
328 gss_name_t server_name
= GSS_C_NO_NAME
;
329 gss_name_t client_name
= GSS_C_NO_NAME
;
334 buffer
*t_in
= buffer_init();
335 if (!buffer_append_base64_decode(t_in
, realm_str
, strlen(realm_str
), BASE64_STANDARD
)) {
336 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "decoding GSSAPI authentication header failed", realm_str
);
338 return mod_authn_gssapi_send_400_bad_request(srv
, con
);
341 mod_authn_gssapi_patch_connection(srv
, con
, p
);
344 /* ??? Should code = krb5_kt_resolve(kcontext, p->conf.auth_gssapi_keytab->ptr, &keytab);
345 * be used, instead of putenv() of KRB5_KTNAME=...? See mod_authn_gssapi_basic() */
346 /* ??? Should KRB5_KTNAME go into con->environment instead ??? */
347 /* ??? Should KRB5_KTNAME be added to mod_authn_gssapi_basic(), too? */
349 memset(&ktname
, 0, sizeof(ktname
));
350 buffer_copy_string(&ktname
, "KRB5_KTNAME=");
351 buffer_append_string_buffer(&ktname
, p
->conf
.auth_gssapi_keytab
);
353 /* ktname.ptr becomes part of the environment, do not free */
356 sprinc
= buffer_init_buffer(p
->conf
.auth_gssapi_principal
);
357 if (strchr(sprinc
->ptr
, '/') == NULL
) {
358 /*(copy HTTP Host, omitting port if port is present)*/
359 /* ??? Should con->server_name be used if http_host not present?
360 * ??? What if con->server_name is not set?
361 * ??? Will this work below if IPv6 provided in Host? probably not */
362 if (!buffer_is_empty(con
->request
.http_host
)) {
363 buffer_append_string(sprinc
, "/");
364 buffer_append_string_len(sprinc
, con
->request
.http_host
->ptr
, strcspn(con
->request
.http_host
->ptr
, ":"));
367 if (strchr(sprinc
->ptr
, '@') == NULL
) {
368 buffer_append_string(sprinc
, "@");
369 buffer_append_string_buffer(sprinc
, require
->realm
);
371 /*#define GSS_C_NT_USER_NAME gss_nt_user_name*/
372 /*#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name*/
373 #define GSS_KRB5_NT_PRINCIPAL_NAME gss_nt_krb5_name
375 token_s
.value
= sprinc
->ptr
;
376 token_s
.length
= buffer_string_length(sprinc
);
377 st_major
= gss_import_name(&st_minor
, &token_s
, (gss_OID
) GSS_KRB5_NT_PRINCIPAL_NAME
, &server_name
);
378 if (GSS_ERROR(st_major
)) {
379 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_import_name", NULL
, st_major
, st_minor
);
383 memset(&token_s
, 0, sizeof(token_s
));
384 st_major
= gss_display_name(&st_minor
, server_name
, &token_s
, NULL
);
385 if (GSS_ERROR(st_major
)) {
386 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_display_name", NULL
, st_major
, st_minor
);
390 /* acquire server's own credentials */
391 st_major
= gss_acquire_cred(&st_minor
, server_name
, GSS_C_INDEFINITE
, GSS_C_NO_OID_SET
, GSS_C_ACCEPT
, &server_cred
, NULL
, NULL
);
392 if (GSS_ERROR(st_major
)) {
393 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_acquire_cred", sprinc
->ptr
, st_major
, st_minor
);
397 /* accept the user's context */
398 token_in
.length
= buffer_string_length(t_in
);
399 token_in
.value
= t_in
->ptr
;
400 st_major
= gss_accept_sec_context(&st_minor
, &context
, server_cred
, &token_in
, GSS_C_NO_CHANNEL_BINDINGS
,
401 &client_name
, NULL
, &token_out
, &acc_flags
, NULL
, &client_cred
);
402 if (GSS_ERROR(st_major
)) {
403 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_accept_sec_context", NULL
, st_major
, st_minor
);
407 /* fetch the username */
408 st_major
= gss_display_name(&st_minor
, client_name
, &token_out
, NULL
);
409 if (GSS_ERROR(st_major
)) {
410 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_display_name", NULL
, st_major
, st_minor
);
414 if (!(acc_flags
& GSS_C_CONF_FLAG
)) {
415 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "No confidentiality for user:", token_out
.value
);
419 if (!(acc_flags
& GSS_C_DELEG_FLAG
)) {
420 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "Unable to delegate credentials for user:", token_out
.value
);
424 /* check the allow-rules */
425 if (!http_auth_match_rules(require
, token_out
.value
, NULL
, NULL
)) {
429 ret
= mod_authn_gssapi_store_gss_creds(srv
, con
, p
, token_out
.value
, client_cred
);
431 http_auth_setenv(con
->environment
, token_out
.value
, token_out
.length
, CONST_STR_LEN("GSSAPI"));
437 if (context
!= GSS_C_NO_CONTEXT
)
438 gss_delete_sec_context(&st_minor
, &context
, GSS_C_NO_BUFFER
);
440 if (client_cred
!= GSS_C_NO_CREDENTIAL
)
441 gss_release_cred(&st_minor
, &client_cred
);
442 if (server_cred
!= GSS_C_NO_CREDENTIAL
)
443 gss_release_cred(&st_minor
, &server_cred
);
445 if (client_name
!= GSS_C_NO_NAME
)
446 gss_release_name(&st_minor
, &client_name
);
447 if (server_name
!= GSS_C_NO_NAME
)
448 gss_release_name(&st_minor
, &server_name
);
451 gss_release_buffer(&st_minor
, &token_s
);
452 /* if (token_in.length)
453 * gss_release_buffer(&st_minor, &token_in); */
454 if (token_out
.length
)
455 gss_release_buffer(&st_minor
, &token_out
);
457 return ret
? HANDLER_GO_ON
: mod_authn_gssapi_send_401_unauthorized_negotiate(srv
, con
);
460 static handler_t
mod_authn_gssapi_check (server
*srv
, connection
*con
, void *p_d
, const struct http_auth_require_t
*require
, const struct http_auth_backend_t
*backend
)
462 data_string
* const ds
=
463 (data_string
*)array_get_element(con
->request
.headers
, "Authorization");
466 if (NULL
== ds
|| buffer_is_empty(ds
->value
)) {
467 return mod_authn_gssapi_send_401_unauthorized_negotiate(srv
, con
);
470 if (0 != strncasecmp(ds
->value
->ptr
, "Negotiate ", sizeof("Negotiate ")-1)) {
471 return mod_authn_gssapi_send_400_bad_request(srv
, con
);
474 return mod_authn_gssapi_check_spnego(srv
, con
, (plugin_data
*)p_d
, require
, ds
->value
->ptr
+sizeof("Negotiate ")-1);
478 * HTTP auth Basic realm="kerberos"
481 static krb5_error_code
mod_authn_gssapi_verify_krb5_init_creds(server
*srv
, krb5_context context
, krb5_creds
*creds
, krb5_principal ap_req_server
, krb5_keytab ap_req_keytab
)
485 krb5_ccache local_ccache
= NULL
;
486 krb5_creds
*new_creds
= NULL
;
487 krb5_auth_context auth_context
= NULL
;
488 krb5_keytab keytab
= NULL
;
491 memset(&req
, 0, sizeof(req
));
493 if (ap_req_keytab
== NULL
) {
494 ret
= krb5_kt_default(context
, &keytab
);
498 keytab
= ap_req_keytab
;
500 ret
= krb5_cc_resolve(context
, "MEMORY:", &local_ccache
);
502 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_resolve() failed when verifying KDC");
507 ret
= krb5_cc_initialize(context
, local_ccache
, creds
->client
);
509 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_initialize() failed when verifying KDC");
513 ret
= krb5_cc_store_cred(context
, local_ccache
, creds
);
515 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_store_cred() failed when verifying KDC");
519 ret
= krb5_unparse_name(context
, ap_req_server
, &server_name
);
521 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_unparse_name() failed when verifying KDC");
524 krb5_free_unparsed_name(context
, server_name
);
526 if (!krb5_principal_compare(context
, ap_req_server
, creds
->server
)) {
527 krb5_creds match_cred
;
529 memset(&match_cred
, 0, sizeof(match_cred
));
531 match_cred
.client
= creds
->client
;
532 match_cred
.server
= ap_req_server
;
534 ret
= krb5_get_credentials(context
, 0, local_ccache
, &match_cred
, &new_creds
);
536 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_get_credentials() failed when verifying KDC");
542 ret
= krb5_mk_req_extended(context
, &auth_context
, 0, NULL
, creds
, &req
);
544 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_mk_req_extended() failed when verifying KDC");
548 krb5_auth_con_free(context
, auth_context
);
550 ret
= krb5_auth_con_init(context
, &auth_context
);
552 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_auth_con_init() failed when verifying KDC");
556 /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
557 krb5_auth_con_setflags(context
, auth_context
, KRB5_AUTH_CONTEXT_DO_SEQUENCE
);
558 ret
= krb5_rd_req(context
, &auth_context
, &req
, ap_req_server
, keytab
, 0, NULL
);
560 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_rd_req() failed when verifying KDC");
565 krb5_free_data_contents(context
, &req
);
567 krb5_auth_con_free(context
, auth_context
);
569 krb5_free_creds(context
, new_creds
);
570 if (ap_req_keytab
== NULL
&& keytab
)
571 krb5_kt_close(context
, keytab
);
573 krb5_cc_destroy(context
, local_ccache
);
578 static int mod_authn_gssapi_store_krb5_creds(server
*srv
, connection
*con
, plugin_data
*p
,
579 krb5_context kcontext
, krb5_ccache delegated_cred
)
581 krb5_error_code problem
;
582 krb5_principal princ
= NULL
;
583 krb5_ccache ccache
= NULL
;
585 problem
= krb5_cc_get_principal(kcontext
, delegated_cred
, &princ
);
587 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_get_principal", NULL
, kcontext
, problem
);
591 if (mod_authn_gssapi_create_krb5_ccache(srv
, con
, p
, kcontext
, princ
, &ccache
)) {
595 problem
= krb5_cc_copy_creds(kcontext
, delegated_cred
, ccache
);
597 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_copy_creds", NULL
, kcontext
, problem
);
601 krb5_free_principal(kcontext
, princ
);
602 krb5_cc_close(kcontext
, ccache
);
607 krb5_free_principal(kcontext
, princ
);
609 krb5_cc_destroy(kcontext
, ccache
);
613 static handler_t
mod_authn_gssapi_send_401_unauthorized_basic (server
*srv
, connection
*con
)
615 con
->http_status
= 401;
617 response_header_insert(srv
, con
, CONST_STR_LEN("WWW-Authenticate"), CONST_STR_LEN("Basic realm=\"Kerberos\""));
618 return HANDLER_FINISHED
;
621 static handler_t
mod_authn_gssapi_basic(server
*srv
, connection
*con
, void *p_d
, const http_auth_require_t
*require
, const buffer
*username
, const char *pw
)
623 krb5_context kcontext
= NULL
;
624 krb5_keytab keytab
= NULL
;
625 krb5_principal s_princ
= NULL
;
626 krb5_principal c_princ
= NULL
;
628 krb5_ccache c_ccache
= NULL
;
629 krb5_ccache ret_ccache
= NULL
;
630 krb5_error_code code
;
633 buffer
*user_at_realm
= NULL
;
634 plugin_data
* const p
= (plugin_data
*)p_d
;
637 log_error_write(srv
, __FILE__
, __LINE__
, "s", "Empty passwords are not accepted");
638 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
);
641 mod_authn_gssapi_patch_connection(srv
, con
, p
);
643 code
= krb5_init_context(&kcontext
);
645 log_error_write(srv
, __FILE__
, __LINE__
, "sd", "krb5_init_context():", code
);
646 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
); /*(well, should be 500)*/
649 code
= krb5_kt_resolve(kcontext
, p
->conf
.auth_gssapi_keytab
->ptr
, &keytab
);
651 log_error_write(srv
, __FILE__
, __LINE__
, "sdb", "krb5_kt_resolve():", code
, p
->conf
.auth_gssapi_keytab
);
652 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
); /*(well, should be 500)*/
655 sprinc
= buffer_init_buffer(p
->conf
.auth_gssapi_principal
);
656 if (strchr(sprinc
->ptr
, '/') == NULL
) {
657 /*(copy HTTP Host, omitting port if port is present)*/
658 /* ??? Should con->server_name be used if http_host not present?
659 * ??? What if con->server_name is not set?
660 * ??? Will this work below if IPv6 provided in Host? probably not */
661 if (!buffer_is_empty(con
->request
.http_host
)) {
662 buffer_append_string(sprinc
, "/");
663 buffer_append_string_len(sprinc
, con
->request
.http_host
->ptr
, strcspn(con
->request
.http_host
->ptr
, ":"));
667 /*(init c_creds before anything which might krb5_free_cred_contents())*/
668 memset(&c_creds
, 0, sizeof(c_creds
));
670 ret
= krb5_parse_name(kcontext
, sprinc
->ptr
, &s_princ
);
672 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", sprinc
->ptr
, kcontext
, ret
);
677 if (strchr(username
->ptr
, '@') == NULL
) {
678 user_at_realm
= buffer_init_buffer(username
);
679 BUFFER_APPEND_STRING_CONST(user_at_realm
, "@");
680 buffer_append_string_buffer(user_at_realm
, require
->realm
);
683 ret
= krb5_parse_name(kcontext
, (user_at_realm
? user_at_realm
->ptr
: username
->ptr
), &c_princ
);
685 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", (user_at_realm
? user_at_realm
->ptr
: username
->ptr
), kcontext
, ret
);
686 if (user_at_realm
) buffer_free(user_at_realm
);
690 if (user_at_realm
) buffer_free(user_at_realm
);
691 /* XXX: if the qualified username with @realm should be in REMOTE_USER,
692 * then http_auth_backend_t basic interface needs to change to pass
693 * modifiable buffer *username, but note that const char *pw follows
694 * in the truncated buffer *username, so pw would need to be copied
695 * before modifying buffer *username */
699 * ret = krb5_unparse_name(kcontext, c_princ, &name);
701 * log_error_write(srv, __FILE__, __LINE__, "sbss", "Trying to get TGT for user:", username, "password:", pw);
703 * krb5_free_unparsed_name(kcontext, name);
706 ret
= krb5_get_init_creds_password(kcontext
, &c_creds
, c_princ
, pw
, NULL
, NULL
, 0, NULL
, NULL
);
708 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_get_init_creds_password", NULL
, kcontext
, ret
);
712 ret
= mod_authn_gssapi_verify_krb5_init_creds(srv
, kcontext
, &c_creds
, s_princ
, keytab
);
714 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "mod_authn_gssapi_verify_krb5_init_creds", NULL
, kcontext
, ret
);
718 ret
= krb5_cc_resolve(kcontext
, "MEMORY:", &ret_ccache
);
720 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_resolve", NULL
, kcontext
, ret
);
724 ret
= krb5_cc_initialize(kcontext
, ret_ccache
, c_princ
);
726 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_initialize", NULL
, kcontext
, ret
);
730 ret
= krb5_cc_store_cred(kcontext
, ret_ccache
, &c_creds
);
732 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_store_cred", NULL
, kcontext
, ret
);
736 c_ccache
= ret_ccache
;
741 krb5_free_cred_contents(kcontext
, &c_creds
);
743 krb5_cc_destroy(kcontext
, ret_ccache
);
745 if (!ret
&& c_ccache
&& (ret
= mod_authn_gssapi_store_krb5_creds(srv
, con
, p
, kcontext
, c_ccache
))) {
746 log_error_write(srv
, __FILE__
, __LINE__
, "sb", "mod_authn_gssapi_store_krb5_creds failed for", username
);
751 krb5_free_principal(kcontext
, c_princ
);
753 krb5_free_principal(kcontext
, s_princ
);
755 krb5_cc_destroy(kcontext
, c_ccache
);
757 krb5_kt_close(kcontext
, keytab
);
759 krb5_free_context(kcontext
);
761 if (0 == ret
&& http_auth_match_rules(require
,username
->ptr
,NULL
,NULL
)){
762 return HANDLER_GO_ON
;
765 /* ret == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN or no authz rules match */
766 log_error_write(srv
, __FILE__
, __LINE__
, "sbsBsB", "password doesn't match for", con
->uri
.path
, "username:", username
, ", IP:", con
->dst_addr_buf
);
767 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
);
772 CONNECTION_FUNC(mod_authn_gssapi_handle_reset
) {
773 plugin_data
*p
= (plugin_data
*)p_d
;
774 buffer
*kccname
= (buffer
*)con
->plugin_ctx
[p
->id
];
775 if (NULL
!= kccname
) {
776 con
->plugin_ctx
[p
->id
] = NULL
;
777 unlink(kccname
->ptr
+sizeof("FILE:")-1);
778 buffer_free(kccname
);
782 return HANDLER_GO_ON
;
785 int mod_authn_gssapi_plugin_init(plugin
*p
);
786 int mod_authn_gssapi_plugin_init(plugin
*p
) {
787 p
->version
= LIGHTTPD_VERSION_ID
;
788 p
->name
= buffer_init_string("authn_gssapi");
789 p
->init
= mod_authn_gssapi_init
;
790 p
->set_defaults
= mod_authn_gssapi_set_defaults
;
791 p
->cleanup
= mod_authn_gssapi_free
;
792 p
->connection_reset
= mod_authn_gssapi_handle_reset
;