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"
42 buffer
*auth_gssapi_keytab
;
43 buffer
*auth_gssapi_principal
;
48 plugin_config
**config_storage
;
52 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
);
53 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
);
55 INIT_FUNC(mod_authn_gssapi_init
) {
56 static http_auth_scheme_t http_auth_scheme_gssapi
=
57 { "gssapi", mod_authn_gssapi_check
, NULL
};
58 static http_auth_backend_t http_auth_backend_gssapi
=
59 { "gssapi", mod_authn_gssapi_basic
, NULL
, NULL
};
60 plugin_data
*p
= calloc(1, sizeof(*p
));
62 /* register http_auth_scheme_gssapi and http_auth_backend_gssapi */
63 http_auth_scheme_gssapi
.p_d
= p
;
64 http_auth_scheme_set(&http_auth_scheme_gssapi
);
65 http_auth_backend_gssapi
.p_d
= p
;
66 http_auth_backend_set(&http_auth_backend_gssapi
);
71 FREE_FUNC(mod_authn_gssapi_free
) {
76 if (!p
) return HANDLER_GO_ON
;
78 if (p
->config_storage
) {
80 for (i
= 0; i
< srv
->config_context
->used
; i
++) {
81 plugin_config
*s
= p
->config_storage
[i
];
83 if (NULL
== s
) continue;
85 buffer_free(s
->auth_gssapi_keytab
);
86 buffer_free(s
->auth_gssapi_principal
);
90 free(p
->config_storage
);
98 SETDEFAULTS_FUNC(mod_authn_gssapi_set_defaults
) {
101 config_values_t cv
[] = {
102 { "auth.backend.gssapi.keytab", NULL
, T_CONFIG_STRING
, T_CONFIG_SCOPE_CONNECTION
},
103 { "auth.backend.gssapi.principal", NULL
, T_CONFIG_STRING
, T_CONFIG_SCOPE_CONNECTION
},
104 { NULL
, NULL
, T_CONFIG_UNSET
, T_CONFIG_SCOPE_UNSET
}
107 p
->config_storage
= calloc(1, srv
->config_context
->used
* sizeof(plugin_config
*));
109 for (i
= 0; i
< srv
->config_context
->used
; i
++) {
110 data_config
const* config
= (data_config
const*)srv
->config_context
->data
[i
];
113 s
= calloc(1, sizeof(plugin_config
));
115 s
->auth_gssapi_keytab
= buffer_init();
116 s
->auth_gssapi_principal
= buffer_init();
118 cv
[0].destination
= s
->auth_gssapi_keytab
;
119 cv
[1].destination
= s
->auth_gssapi_principal
;
121 p
->config_storage
[i
] = s
;
123 if (0 != config_insert_values_global(srv
, config
->value
, cv
, i
== 0 ? T_CONFIG_SCOPE_SERVER
: T_CONFIG_SCOPE_CONNECTION
)) {
124 return HANDLER_ERROR
;
128 return HANDLER_GO_ON
;
133 static int mod_authn_gssapi_patch_connection(server
*srv
, connection
*con
, plugin_data
*p
)
136 plugin_config
*s
= p
->config_storage
[0];
138 PATCH(auth_gssapi_keytab
);
139 PATCH(auth_gssapi_principal
);
141 /* skip the first, the global context */
142 for (i
= 1; i
< srv
->config_context
->used
; i
++) {
143 data_config
*dc
= (data_config
*)srv
->config_context
->data
[i
];
144 s
= p
->config_storage
[i
];
146 /* condition didn't match */
147 if (!config_check_cond(srv
, con
, dc
)) continue;
150 for (j
= 0; j
< dc
->value
->used
; j
++) {
151 data_unset
*du
= dc
->value
->data
[j
];
153 if (buffer_is_equal_string(du
->key
, CONST_STR_LEN("auth.backend.gssapi.keytab"))) {
154 PATCH(auth_gssapi_keytab
);
155 } else if (buffer_is_equal_string(du
->key
, CONST_STR_LEN("auth.backend.gssapi.principal"))) {
156 PATCH(auth_gssapi_principal
);
165 static handler_t
mod_authn_gssapi_send_400_bad_request (server
*srv
, connection
*con
)
168 con
->http_status
= 400;
170 return HANDLER_FINISHED
;
173 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
)
175 buffer
* const msg
= buffer_init_string(func
);
176 OM_uint32 maj_stat
, min_stat
;
177 OM_uint32 msg_ctx
= 0;
178 gss_buffer_desc status_string
;
180 buffer_append_string_len(msg
, CONST_STR_LEN("("));
181 if (extra
) buffer_append_string(msg
, extra
);
182 buffer_append_string_len(msg
, CONST_STR_LEN("):"));
185 maj_stat
= gss_display_status(&min_stat
, err_maj
, GSS_C_GSS_CODE
,
186 GSS_C_NO_OID
, &msg_ctx
, &status_string
);
187 if (GSS_ERROR(maj_stat
))
190 buffer_append_string(msg
, status_string
.value
);
191 gss_release_buffer(&min_stat
, &status_string
);
193 maj_stat
= gss_display_status(&min_stat
, err_min
, GSS_C_MECH_CODE
,
194 GSS_C_NULL_OID
, &msg_ctx
, &status_string
);
195 if (!GSS_ERROR(maj_stat
)) {
196 buffer_append_string(msg
, " (");
197 buffer_append_string(msg
, status_string
.value
);
198 buffer_append_string(msg
, ")");
199 gss_release_buffer(&min_stat
, &status_string
);
201 } while (!GSS_ERROR(maj_stat
) && msg_ctx
!= 0);
203 log_error_write(srv
, file
, line
, "b", msg
);
207 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
)
210 /*(extra might be NULL)*/
211 log_error_write(srv
, file
, line
, "sssss", func
, "(", extra
, "):",
212 error_message(code
));
215 static int mod_authn_gssapi_create_krb5_ccache(server
*srv
, connection
*con
, plugin_data
*p
, krb5_context kcontext
, krb5_principal princ
, krb5_ccache
*ccache
)
217 buffer
* const kccname
= buffer_init_string("FILE:/tmp/krb5cc_gssapi_XXXXXX");
218 char * const ccname
= kccname
->ptr
+ sizeof("FILE:")-1;
219 const size_t ccnamelen
= buffer_string_length(kccname
)-(sizeof("FILE:")-1);
220 /*(future: might consider using server.upload-dirs instead of /tmp)*/
222 /* POSIX-2008 requires mkstemp create file with 0600 perms */
225 /* coverity[secure_temp : FALSE] */
226 int fd
= mkstemp(ccname
);
228 log_error_write(srv
, __FILE__
, __LINE__
, "sss", "mkstemp():", ccname
, strerror(errno
));
229 buffer_free(kccname
);
235 krb5_error_code problem
;
237 problem
= krb5_cc_resolve(kcontext
, kccname
->ptr
, ccache
);
239 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_resolve", NULL
, kcontext
, problem
);
243 problem
= krb5_cc_initialize(kcontext
, *ccache
, princ
);
245 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_initialize", kccname
->ptr
, kcontext
, problem
);
249 con
->plugin_ctx
[p
->id
] = kccname
;
251 array_set_key_value(con
->environment
, CONST_STR_LEN("KRB5CCNAME"), ccname
, ccnamelen
);
252 array_set_key_value(con
->request
.headers
, CONST_STR_LEN("X-Forwarded-Keytab"), ccname
, ccnamelen
);
259 krb5_cc_destroy(kcontext
, *ccache
);
263 buffer_free(kccname
);
269 * HTTP auth Negotiate
272 static handler_t
mod_authn_gssapi_send_401_unauthorized_negotiate (server
*srv
, connection
*con
)
274 con
->http_status
= 401;
276 response_header_insert(srv
, con
, CONST_STR_LEN("WWW-Authenticate"), CONST_STR_LEN("Negotiate"));
277 return HANDLER_FINISHED
;
280 static int mod_authn_gssapi_store_gss_creds(server
*srv
, connection
*con
, plugin_data
*p
, char *princ_name
, gss_cred_id_t delegated_cred
)
282 OM_uint32 maj_stat
, min_stat
;
283 krb5_principal princ
= NULL
;
284 krb5_ccache ccache
= NULL
;
285 krb5_error_code problem
;
286 krb5_context context
;
288 problem
= krb5_init_context(&context
);
290 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_init_context", NULL
, context
, problem
);
294 problem
= krb5_parse_name(context
, princ_name
, &princ
);
296 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", NULL
, context
, problem
);
300 if (mod_authn_gssapi_create_krb5_ccache(srv
, con
, p
, context
, princ
, &ccache
))
303 maj_stat
= gss_krb5_copy_ccache(&min_stat
, delegated_cred
, ccache
);
304 if (GSS_ERROR(maj_stat
)) {
305 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_krb5_copy_ccache", princ_name
, maj_stat
, min_stat
);
309 krb5_cc_close(context
, ccache
);
310 krb5_free_principal(context
, princ
);
311 krb5_free_context(context
);
316 krb5_free_principal(context
, princ
);
318 krb5_cc_destroy(context
, ccache
);
319 krb5_free_context(context
);
324 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
)
326 OM_uint32 st_major
, st_minor
, acc_flags
;
327 gss_buffer_desc token_s
= GSS_C_EMPTY_BUFFER
;
328 gss_buffer_desc token_in
= GSS_C_EMPTY_BUFFER
;
329 gss_buffer_desc token_out
= GSS_C_EMPTY_BUFFER
;
330 gss_cred_id_t server_cred
= GSS_C_NO_CREDENTIAL
;
331 gss_cred_id_t client_cred
= GSS_C_NO_CREDENTIAL
;
332 gss_ctx_id_t context
= GSS_C_NO_CONTEXT
;
333 gss_name_t server_name
= GSS_C_NO_NAME
;
334 gss_name_t client_name
= GSS_C_NO_NAME
;
339 buffer
*t_in
= buffer_init();
340 if (!buffer_append_base64_decode(t_in
, realm_str
, strlen(realm_str
), BASE64_STANDARD
)) {
341 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "decoding GSSAPI authentication header failed", realm_str
);
343 return mod_authn_gssapi_send_400_bad_request(srv
, con
);
346 mod_authn_gssapi_patch_connection(srv
, con
, p
);
349 /* ??? Should code = krb5_kt_resolve(kcontext, p->conf.auth_gssapi_keytab->ptr, &keytab);
350 * be used, instead of putenv() of KRB5_KTNAME=...? See mod_authn_gssapi_basic() */
351 /* ??? Should KRB5_KTNAME go into con->environment instead ??? */
352 /* ??? Should KRB5_KTNAME be added to mod_authn_gssapi_basic(), too? */
354 memset(&ktname
, 0, sizeof(ktname
));
355 buffer_copy_string(&ktname
, "KRB5_KTNAME=");
356 buffer_append_string_buffer(&ktname
, p
->conf
.auth_gssapi_keytab
);
358 /* ktname.ptr becomes part of the environment, do not free */
361 sprinc
= buffer_init_buffer(p
->conf
.auth_gssapi_principal
);
362 if (strchr(sprinc
->ptr
, '/') == NULL
) {
363 /*(copy HTTP Host, omitting port if port is present)*/
364 /* ??? Should con->server_name be used if http_host not present?
365 * ??? What if con->server_name is not set?
366 * ??? Will this work below if IPv6 provided in Host? probably not */
367 if (!buffer_is_empty(con
->request
.http_host
)) {
368 buffer_append_string(sprinc
, "/");
369 buffer_append_string_len(sprinc
, con
->request
.http_host
->ptr
, strcspn(con
->request
.http_host
->ptr
, ":"));
372 if (strchr(sprinc
->ptr
, '@') == NULL
) {
373 buffer_append_string(sprinc
, "@");
374 buffer_append_string_buffer(sprinc
, require
->realm
);
376 /*#define GSS_C_NT_USER_NAME gss_nt_user_name*/
377 /*#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name*/
378 #define GSS_KRB5_NT_PRINCIPAL_NAME gss_nt_krb5_name
380 token_s
.value
= sprinc
->ptr
;
381 token_s
.length
= buffer_string_length(sprinc
);
382 st_major
= gss_import_name(&st_minor
, &token_s
, (gss_OID
) GSS_KRB5_NT_PRINCIPAL_NAME
, &server_name
);
383 if (GSS_ERROR(st_major
)) {
384 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_import_name", NULL
, st_major
, st_minor
);
388 memset(&token_s
, 0, sizeof(token_s
));
389 st_major
= gss_display_name(&st_minor
, server_name
, &token_s
, NULL
);
390 if (GSS_ERROR(st_major
)) {
391 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_display_name", NULL
, st_major
, st_minor
);
395 /* acquire server's own credentials */
396 st_major
= gss_acquire_cred(&st_minor
, server_name
, GSS_C_INDEFINITE
, GSS_C_NO_OID_SET
, GSS_C_ACCEPT
, &server_cred
, NULL
, NULL
);
397 if (GSS_ERROR(st_major
)) {
398 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_acquire_cred", sprinc
->ptr
, st_major
, st_minor
);
402 /* accept the user's context */
403 token_in
.length
= buffer_string_length(t_in
);
404 token_in
.value
= t_in
->ptr
;
405 st_major
= gss_accept_sec_context(&st_minor
, &context
, server_cred
, &token_in
, GSS_C_NO_CHANNEL_BINDINGS
,
406 &client_name
, NULL
, &token_out
, &acc_flags
, NULL
, &client_cred
);
407 if (GSS_ERROR(st_major
)) {
408 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_accept_sec_context", NULL
, st_major
, st_minor
);
412 /* fetch the username */
413 st_major
= gss_display_name(&st_minor
, client_name
, &token_out
, NULL
);
414 if (GSS_ERROR(st_major
)) {
415 mod_authn_gssapi_log_gss_error(srv
, __FILE__
, __LINE__
, "gss_display_name", NULL
, st_major
, st_minor
);
419 if (!(acc_flags
& GSS_C_CONF_FLAG
)) {
420 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "No confidentiality for user:", token_out
.value
);
424 if (!(acc_flags
& GSS_C_DELEG_FLAG
)) {
425 log_error_write(srv
, __FILE__
, __LINE__
, "ss", "Unable to delegate credentials for user:", token_out
.value
);
429 /* check the allow-rules */
430 if (!http_auth_match_rules(require
, token_out
.value
, NULL
, NULL
)) {
434 ret
= mod_authn_gssapi_store_gss_creds(srv
, con
, p
, token_out
.value
, client_cred
);
436 http_auth_setenv(con
->environment
, token_out
.value
, token_out
.length
, CONST_STR_LEN("GSSAPI"));
442 if (context
!= GSS_C_NO_CONTEXT
)
443 gss_delete_sec_context(&st_minor
, &context
, GSS_C_NO_BUFFER
);
445 if (client_cred
!= GSS_C_NO_CREDENTIAL
)
446 gss_release_cred(&st_minor
, &client_cred
);
447 if (server_cred
!= GSS_C_NO_CREDENTIAL
)
448 gss_release_cred(&st_minor
, &server_cred
);
450 if (client_name
!= GSS_C_NO_NAME
)
451 gss_release_name(&st_minor
, &client_name
);
452 if (server_name
!= GSS_C_NO_NAME
)
453 gss_release_name(&st_minor
, &server_name
);
456 gss_release_buffer(&st_minor
, &token_s
);
457 /* if (token_in.length)
458 * gss_release_buffer(&st_minor, &token_in); */
459 if (token_out
.length
)
460 gss_release_buffer(&st_minor
, &token_out
);
462 return ret
? HANDLER_GO_ON
: mod_authn_gssapi_send_401_unauthorized_negotiate(srv
, con
);
465 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
)
467 data_string
* const ds
=
468 (data_string
*)array_get_element(con
->request
.headers
, "Authorization");
471 if (NULL
== ds
|| buffer_is_empty(ds
->value
)) {
472 return mod_authn_gssapi_send_401_unauthorized_negotiate(srv
, con
);
475 if (0 != strncasecmp(ds
->value
->ptr
, "Negotiate ", sizeof("Negotiate ")-1)) {
476 return mod_authn_gssapi_send_400_bad_request(srv
, con
);
479 return mod_authn_gssapi_check_spnego(srv
, con
, (plugin_data
*)p_d
, require
, ds
->value
->ptr
+sizeof("Negotiate ")-1);
483 * HTTP auth Basic realm="kerberos"
486 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
)
490 krb5_ccache local_ccache
= NULL
;
491 krb5_creds
*new_creds
= NULL
;
492 krb5_auth_context auth_context
= NULL
;
493 krb5_keytab keytab
= NULL
;
496 memset(&req
, 0, sizeof(req
));
498 if (ap_req_keytab
== NULL
) {
499 ret
= krb5_kt_default(context
, &keytab
);
503 keytab
= ap_req_keytab
;
505 ret
= krb5_cc_resolve(context
, "MEMORY:", &local_ccache
);
507 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_resolve() failed when verifying KDC");
512 ret
= krb5_cc_initialize(context
, local_ccache
, creds
->client
);
514 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_initialize() failed when verifying KDC");
518 ret
= krb5_cc_store_cred(context
, local_ccache
, creds
);
520 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_cc_store_cred() failed when verifying KDC");
524 ret
= krb5_unparse_name(context
, ap_req_server
, &server_name
);
526 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_unparse_name() failed when verifying KDC");
529 krb5_free_unparsed_name(context
, server_name
);
531 if (!krb5_principal_compare(context
, ap_req_server
, creds
->server
)) {
532 krb5_creds match_cred
;
534 memset(&match_cred
, 0, sizeof(match_cred
));
536 match_cred
.client
= creds
->client
;
537 match_cred
.server
= ap_req_server
;
539 ret
= krb5_get_credentials(context
, 0, local_ccache
, &match_cred
, &new_creds
);
541 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_get_credentials() failed when verifying KDC");
547 ret
= krb5_mk_req_extended(context
, &auth_context
, 0, NULL
, creds
, &req
);
549 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_mk_req_extended() failed when verifying KDC");
553 krb5_auth_con_free(context
, auth_context
);
555 ret
= krb5_auth_con_init(context
, &auth_context
);
557 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_auth_con_init() failed when verifying KDC");
561 /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
562 krb5_auth_con_setflags(context
, auth_context
, KRB5_AUTH_CONTEXT_DO_SEQUENCE
);
563 ret
= krb5_rd_req(context
, &auth_context
, &req
, ap_req_server
, keytab
, 0, NULL
);
565 log_error_write(srv
, __FILE__
, __LINE__
, "s", "krb5_rd_req() failed when verifying KDC");
570 krb5_free_data_contents(context
, &req
);
572 krb5_auth_con_free(context
, auth_context
);
574 krb5_free_creds(context
, new_creds
);
575 if (ap_req_keytab
== NULL
&& keytab
)
576 krb5_kt_close(context
, keytab
);
578 krb5_cc_destroy(context
, local_ccache
);
583 static int mod_authn_gssapi_store_krb5_creds(server
*srv
, connection
*con
, plugin_data
*p
,
584 krb5_context kcontext
, krb5_ccache delegated_cred
)
586 krb5_error_code problem
;
587 krb5_principal princ
= NULL
;
588 krb5_ccache ccache
= NULL
;
590 problem
= krb5_cc_get_principal(kcontext
, delegated_cred
, &princ
);
592 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_get_principal", NULL
, kcontext
, problem
);
596 if (mod_authn_gssapi_create_krb5_ccache(srv
, con
, p
, kcontext
, princ
, &ccache
)) {
600 problem
= krb5_cc_copy_creds(kcontext
, delegated_cred
, ccache
);
602 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_copy_creds", NULL
, kcontext
, problem
);
606 krb5_free_principal(kcontext
, princ
);
607 krb5_cc_close(kcontext
, ccache
);
612 krb5_free_principal(kcontext
, princ
);
614 krb5_cc_destroy(kcontext
, ccache
);
618 static handler_t
mod_authn_gssapi_send_401_unauthorized_basic (server
*srv
, connection
*con
)
620 con
->http_status
= 401;
622 response_header_insert(srv
, con
, CONST_STR_LEN("WWW-Authenticate"), CONST_STR_LEN("Basic realm=\"Kerberos\""));
623 return HANDLER_FINISHED
;
626 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
)
628 krb5_context kcontext
= NULL
;
629 krb5_keytab keytab
= NULL
;
630 krb5_principal s_princ
= NULL
;
631 krb5_principal c_princ
= NULL
;
633 krb5_ccache c_ccache
= NULL
;
634 krb5_ccache ret_ccache
= NULL
;
635 krb5_error_code code
;
638 buffer
*user_at_realm
= NULL
;
639 plugin_data
* const p
= (plugin_data
*)p_d
;
642 log_error_write(srv
, __FILE__
, __LINE__
, "s", "Empty passwords are not accepted");
643 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
);
646 mod_authn_gssapi_patch_connection(srv
, con
, p
);
648 code
= krb5_init_context(&kcontext
);
650 log_error_write(srv
, __FILE__
, __LINE__
, "sd", "krb5_init_context():", code
);
651 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
); /*(well, should be 500)*/
654 code
= krb5_kt_resolve(kcontext
, p
->conf
.auth_gssapi_keytab
->ptr
, &keytab
);
656 log_error_write(srv
, __FILE__
, __LINE__
, "sdb", "krb5_kt_resolve():", code
, p
->conf
.auth_gssapi_keytab
);
657 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
); /*(well, should be 500)*/
660 sprinc
= buffer_init_buffer(p
->conf
.auth_gssapi_principal
);
661 if (strchr(sprinc
->ptr
, '/') == NULL
) {
662 /*(copy HTTP Host, omitting port if port is present)*/
663 /* ??? Should con->server_name be used if http_host not present?
664 * ??? What if con->server_name is not set?
665 * ??? Will this work below if IPv6 provided in Host? probably not */
666 if (!buffer_is_empty(con
->request
.http_host
)) {
667 buffer_append_string(sprinc
, "/");
668 buffer_append_string_len(sprinc
, con
->request
.http_host
->ptr
, strcspn(con
->request
.http_host
->ptr
, ":"));
672 /*(init c_creds before anything which might krb5_free_cred_contents())*/
673 memset(&c_creds
, 0, sizeof(c_creds
));
675 ret
= krb5_parse_name(kcontext
, sprinc
->ptr
, &s_princ
);
677 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", sprinc
->ptr
, kcontext
, ret
);
682 if (strchr(username
->ptr
, '@') == NULL
) {
683 user_at_realm
= buffer_init_buffer(username
);
684 BUFFER_APPEND_STRING_CONST(user_at_realm
, "@");
685 buffer_append_string_buffer(user_at_realm
, require
->realm
);
688 ret
= krb5_parse_name(kcontext
, (user_at_realm
? user_at_realm
->ptr
: username
->ptr
), &c_princ
);
690 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_parse_name", (user_at_realm
? user_at_realm
->ptr
: username
->ptr
), kcontext
, ret
);
691 if (user_at_realm
) buffer_free(user_at_realm
);
695 if (user_at_realm
) buffer_free(user_at_realm
);
696 /* XXX: if the qualified username with @realm should be in REMOTE_USER,
697 * then http_auth_backend_t basic interface needs to change to pass
698 * modifiable buffer *username, but note that const char *pw follows
699 * in the truncated buffer *username, so pw would need to be copied
700 * before modifying buffer *username */
704 * ret = krb5_unparse_name(kcontext, c_princ, &name);
706 * log_error_write(srv, __FILE__, __LINE__, "sbss", "Trying to get TGT for user:", username, "password:", pw);
708 * krb5_free_unparsed_name(kcontext, name);
711 ret
= krb5_get_init_creds_password(kcontext
, &c_creds
, c_princ
, pw
, NULL
, NULL
, 0, NULL
, NULL
);
713 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_get_init_creds_password", NULL
, kcontext
, ret
);
717 ret
= mod_authn_gssapi_verify_krb5_init_creds(srv
, kcontext
, &c_creds
, s_princ
, keytab
);
719 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "mod_authn_gssapi_verify_krb5_init_creds", NULL
, kcontext
, ret
);
723 ret
= krb5_cc_resolve(kcontext
, "MEMORY:", &ret_ccache
);
725 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_resolve", NULL
, kcontext
, ret
);
729 ret
= krb5_cc_initialize(kcontext
, ret_ccache
, c_princ
);
731 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_initialize", NULL
, kcontext
, ret
);
735 ret
= krb5_cc_store_cred(kcontext
, ret_ccache
, &c_creds
);
737 mod_authn_gssapi_log_krb5_error(srv
, __FILE__
, __LINE__
, "krb5_cc_store_cred", NULL
, kcontext
, ret
);
741 c_ccache
= ret_ccache
;
746 krb5_free_cred_contents(kcontext
, &c_creds
);
748 krb5_cc_destroy(kcontext
, ret_ccache
);
750 if (!ret
&& c_ccache
&& (ret
= mod_authn_gssapi_store_krb5_creds(srv
, con
, p
, kcontext
, c_ccache
))) {
751 log_error_write(srv
, __FILE__
, __LINE__
, "sb", "mod_authn_gssapi_store_krb5_creds failed for", username
);
756 krb5_free_principal(kcontext
, c_princ
);
758 krb5_free_principal(kcontext
, s_princ
);
760 krb5_cc_destroy(kcontext
, c_ccache
);
762 krb5_kt_close(kcontext
, keytab
);
764 krb5_free_context(kcontext
);
766 if (0 == ret
&& http_auth_match_rules(require
,username
->ptr
,NULL
,NULL
)){
767 return HANDLER_GO_ON
;
770 /* ret == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN or no authz rules match */
771 log_error_write(srv
, __FILE__
, __LINE__
, "sbsBsB", "password doesn't match for", con
->uri
.path
, "username:", username
, ", IP:", con
->dst_addr_buf
);
772 return mod_authn_gssapi_send_401_unauthorized_basic(srv
, con
);
777 CONNECTION_FUNC(mod_authn_gssapi_handle_reset
) {
778 plugin_data
*p
= (plugin_data
*)p_d
;
779 buffer
*kccname
= (buffer
*)con
->plugin_ctx
[p
->id
];
780 if (NULL
!= kccname
) {
781 con
->plugin_ctx
[p
->id
] = NULL
;
782 unlink(kccname
->ptr
+sizeof("FILE:")-1);
783 buffer_free(kccname
);
787 return HANDLER_GO_ON
;
790 int mod_authn_gssapi_plugin_init(plugin
*p
);
791 int mod_authn_gssapi_plugin_init(plugin
*p
) {
792 p
->version
= LIGHTTPD_VERSION_ID
;
793 p
->name
= buffer_init_string("authn_gssapi");
794 p
->init
= mod_authn_gssapi_init
;
795 p
->set_defaults
= mod_authn_gssapi_set_defaults
;
796 p
->cleanup
= mod_authn_gssapi_free
;
797 p
->connection_reset
= mod_authn_gssapi_handle_reset
;