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32 #include "mod_auth_gssapi.h"
34 module AP_MODULE_DECLARE_DATA auth_gssapi_module;
36 #define command(name, func, var, type, usage) \
37 AP_INIT_ ## type (name, (void*) func, \
38 (void*)APR_OFFSETOF(gss_auth_config, var), \
39 OR_AUTHCFG | RSRC_CONF, usage)
41 static const command_rec gss_config_cmds[] = {
42 command("GSSServiceName", ap_set_string_slot, service_name,
43 TAKE1, "Service name used for Apache authentication."),
45 command("GSSKrb5Keytab", ap_set_string_slot, krb5_keytab,
46 TAKE1, "Location of Kerberos V5 keytab file."),
52 set_http_headers(request_rec *r, const gss_auth_config *conf,
53 char *negotiate_ret_value)
56 const char *header_name = (r->proxyreq == PROXYREQ_PROXY) ?
57 "Proxy-Authenticate" : "WWW-Authenticate";
59 if (negotiate_ret_value == NULL)
62 negoauth_param = (*negotiate_ret_value == '\0') ? "Negotiate" :
63 apr_pstrcat(r->pool, "Negotiate ", negotiate_ret_value, NULL);
64 apr_table_add(r->err_headers_out, header_name, negoauth_param);
68 gss_authenticate(request_rec *r, gss_auth_config *conf, gss_conn_ctx ctx,
69 const char *auth_line, char **negotiate_ret_value)
71 OM_uint32 major_status, minor_status, minor_status2;
72 gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
73 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
74 const char *auth_param = NULL;
76 gss_name_t client_name = GSS_C_NO_NAME;
77 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
78 gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
79 OM_uint32 ret_flags = 0;
80 gss_OID_desc spnego_oid;
81 OM_uint32 (*accept_sec_context)
82 (OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
83 const gss_buffer_t, const gss_channel_bindings_t,
84 gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
85 OM_uint32 *, gss_cred_id_t *);
87 *negotiate_ret_value = "\0";
89 spnego_oid.length = 6;
90 spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
92 if (conf->krb5_keytab) {
94 /* we don't use the ap_* calls here, since the string passed to putenv()
95 * will become part of the enviroment and shouldn't be free()ed by apache
97 ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb5_keytab) + 1);
99 gss_log(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
100 ret = HTTP_INTERNAL_SERVER_ERROR;
103 sprintf(ktname, "KRB5_KTNAME=%s", conf->krb5_keytab);
106 /* Seems to be also supported by latest MIT */
107 gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
111 /* ap_getword() shifts parameter */
112 auth_param = ap_getword_white(r->pool, &auth_line);
113 if (auth_param == NULL) {
114 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
115 "No Authorization parameter in request from client");
116 ret = HTTP_UNAUTHORIZED;
120 if (ctx->state == GSS_CTX_ESTABLISHED) {
121 gss_delete_sec_context(&minor_status, &ctx->context, GSS_C_NO_BUFFER);
122 ctx->context = GSS_C_NO_CONTEXT;
123 ctx->state = GSS_CTX_EMPTY;
126 input_token.length = apr_base64_decode_len(auth_param) + 1;
127 input_token.value = apr_pcalloc(r->connection->pool, input_token.length);
128 if (input_token.value == NULL) {
129 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
130 "ap_pcalloc() failed (not enough memory)");
131 ret = HTTP_INTERNAL_SERVER_ERROR;
134 input_token.length = apr_base64_decode(input_token.value, auth_param);
136 /* LOG length, type */
138 #ifdef GSSAPI_SUPPORTS_SPNEGO
139 accept_sec_context = gss_accept_sec_context;
141 accept_sec_context = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
142 gss_accept_sec_context_spnego : gss_accept_sec_context;
145 major_status = accept_sec_context(&minor_status,
149 GSS_C_NO_CHANNEL_BINDINGS,
156 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
157 "Client %s us their credential",
158 (ret_flags & GSS_C_DELEG_FLAG) ? "delegated" : "didn't delegate");
159 if (output_token.length) {
163 len = apr_base64_encode_len(output_token.length) + 1;
164 token = apr_pcalloc(r->connection->pool, len + 1);
166 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
167 "ap_pcalloc() failed (not enough memory)");
168 ret = HTTP_INTERNAL_SERVER_ERROR;
169 gss_release_buffer(&minor_status2, &output_token);
172 apr_base64_encode(token, output_token.value, output_token.length);
174 *negotiate_ret_value = token;
175 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
176 "GSS-API token of length %d bytes will be sent back",
177 output_token.length);
178 gss_release_buffer(&minor_status2, &output_token);
181 if (GSS_ERROR(major_status)) {
182 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
183 "%s", get_gss_error(r, major_status, minor_status,
184 "Failed to establish authentication"));
186 /* Don't offer the Negotiate method again if call to GSS layer failed */
187 /* XXX ... which means we don't return the "error" output */
188 *negotiate_ret_value = NULL;
190 gss_delete_sec_context(&minor_status, &ctx->context, GSS_C_NO_BUFFER);
191 ctx->context = GSS_C_NO_CONTEXT;
192 ctx->state = GSS_CTX_EMPTY;
193 ret = HTTP_UNAUTHORIZED;
197 if (major_status & GSS_S_CONTINUE_NEEDED) {
198 ctx->state = GSS_CTX_IN_PROGRESS;
199 ret = HTTP_UNAUTHORIZED;
203 major_status = gss_inquire_context(&minor_status, ctx->context, &client_name,
204 NULL, NULL, NULL, NULL, NULL, NULL);
205 if (GSS_ERROR(major_status)) {
206 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
207 "%s", get_gss_error(r, major_status, minor_status, "gss_inquire_context() failed"));
208 ret = HTTP_INTERNAL_SERVER_ERROR;
212 major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
213 gss_release_name(&minor_status, &client_name);
214 if (GSS_ERROR(major_status)) {
215 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
216 "%s", get_gss_error(r, major_status, minor_status,
217 "gss_display_name() failed"));
218 ret = HTTP_INTERNAL_SERVER_ERROR;
222 ctx->state = GSS_CTX_ESTABLISHED;
223 ctx->user = apr_pstrdup(r->pool, output_token.value);
224 gss_release_buffer(&minor_status, &output_token);
230 gss_release_cred(&minor_status, &delegated_cred);
232 if (output_token.length)
233 gss_release_buffer(&minor_status, &output_token);
235 if (client_name != GSS_C_NO_NAME)
236 gss_release_name(&minor_status, &client_name);
238 if (server_creds != GSS_C_NO_CREDENTIAL)
239 gss_release_cred(&minor_status, &server_creds);
245 gss_authenticate_user(request_rec *r)
247 gss_auth_config *conf =
248 (gss_auth_config *) ap_get_module_config(r->per_dir_config,
249 &auth_gssapi_module);
250 const char *auth_line = NULL;
251 const char *type = NULL;
252 char *auth_type = NULL;
253 char *negotiate_ret_value = NULL;
254 gss_conn_ctx conn_ctx = NULL;
257 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "Entering GSSAPI authentication");
259 /* get the type specified in Apache configuration */
260 type = ap_auth_type(r);
261 if (type == NULL || strcmp(type, "Negotiate") != 0) {
262 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
263 "AuthType '%s' is not for us, bailing out",
264 (type) ? type : "(NULL)");
269 /* get what the user sent us in the HTTP header */
270 auth_line = apr_table_get(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
271 ? "Proxy-Authorization"
273 if (auth_line == NULL) {
274 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
275 "Client hasn't sent any authentication data, giving up");
276 set_http_headers(r, conf, "\0");
277 return HTTP_UNAUTHORIZED;
280 auth_type = ap_getword_white(r->pool, &auth_line);
281 if (strcasecmp(auth_type, "Negotiate") != 0) {
282 gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
283 "Unsupported authentication type (%s) requested by client",
284 (auth_type) ? auth_type : "(NULL)");
285 set_http_headers(r, conf, "\0");
286 return HTTP_UNAUTHORIZED;
289 if ((NULL == (conn_ctx = gss_retrieve_conn_ctx(r))) &&
290 (NULL == (conn_ctx = gss_create_conn_ctx(r, conf)))) {
291 gss_log(APLOG_MARK, APLOG_ERR, 0, r,
292 "Failed to create internal context: probably not enough memory");
293 return HTTP_INTERNAL_SERVER_ERROR;
296 /* optimizing hack */
297 if (conn_ctx->state == GSS_CTX_ESTABLISHED && auth_line == NULL) {
298 r->user = apr_pstrdup(r->pool, conn_ctx->user);
299 r->ap_auth_type = "Negotiate";
303 /* XXXX subrequests ignored, only successful accesses taken into account! */
304 if (!ap_is_initial_req(r) && conn_ctx->state == GSS_CTX_ESTABLISHED) {
305 r->user = apr_pstrdup(r->pool, conn_ctx->user);
306 r->ap_auth_type = "Negotiate";
310 ret = gss_authenticate(r, conf, conn_ctx,
311 auth_line, &negotiate_ret_value);
312 if (ret == HTTP_UNAUTHORIZED || ret == OK) {
314 set_http_headers(r, conf, negotiate_ret_value);
318 r->user = apr_pstrdup(r->pool, conn_ctx->user);
319 r->ap_auth_type = "Negotiate";
328 gss_register_hooks(apr_pool_t *p)
330 ap_hook_check_user_id(gss_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
333 module AP_MODULE_DECLARE_DATA auth_gssapi_module = {
334 STANDARD20_MODULE_STUFF,
335 gss_config_dir_create,