return true;
}
-static bool is_mech_allowed(struct mag_config *cfg, gss_const_OID mech)
+static bool is_mech_allowed(gss_OID_set allowed_mechs, gss_const_OID mech,
+ bool multi_step_supported)
{
- if (cfg->allowed_mechs == GSS_C_NO_OID_SET) return true;
+ if (!multi_step_supported && gss_oid_equal(&gss_mech_ntlmssp, mech))
+ return false;
+
+ if (allowed_mechs == GSS_C_NO_OID_SET) return true;
- for (int i = 0; i < cfg->allowed_mechs->count; i++) {
- if (gss_oid_equal(&cfg->allowed_mechs->elements[i], mech)) {
+ for (int i = 0; i < allowed_mechs->count; i++) {
+ if (gss_oid_equal(&allowed_mechs->elements[i], mech)) {
return true;
}
}
uint32_t maj, min;
int present = 0;
+ if (src == GSS_C_NO_OID_SET) return GSS_C_NO_OID_SET;
+
for (int i = 0; unwanted_mechs[i] != GSS_C_NO_OID; i++) {
maj = gss_test_oid_set_member(&min,
discard_const(unwanted_mechs[i]),
gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
- gss_OID_set indicated_mechs = GSS_C_NO_OID_SET;
gss_OID_set allowed_mechs;
gss_OID_set filtered_mechs;
gss_OID_set actual_mechs = GSS_C_NO_OID_SET;
} else if (cfg->allowed_mechs) {
allowed_mechs = cfg->allowed_mechs;
} else {
+ struct mag_server_config *scfg;
/* Try to fetch the default set if not explicitly configured,
* We need to do this because gss_acquire_cred_with_password()
* is currently limited to acquire creds for a single "default"
* mechanism if no desired mechanisms are passed in. This causes
* authentication to fail for secondary mechanisms as no user
* credentials are generated for those. */
- maj = gss_indicate_mechs(&min, &indicated_mechs);
- if (maj != GSS_S_COMPLETE) {
- ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, req, "%s",
- mag_error(req, "gss_indicate_mechs() failed",
- maj, min));
- /* if indicated _mechs failed, set GSS_C_NO_OID_SET. This
- * generally causes only the krb5 mechanism to be tried due
- * to implementation constraints, but may change in future. */
- allowed_mechs = GSS_C_NO_OID_SET;
- } else {
- allowed_mechs = indicated_mechs;
- }
+ scfg = ap_get_module_config(req->server->module_config,
+ &auth_gssapi_module);
+ /* In the worst case scenario default_mechs equals to GSS_C_NO_OID_SET.
+ * This generally causes only the krb5 mechanism to be tried due
+ * to implementation constraints, but may change in future. */
+ allowed_mechs = scfg->default_mechs;
}
/* Remove Spnego if present, or we'd repeat failed authentiations
* multiple times uselessly.
*/
filtered_mechs = mag_filter_unwanted_mechs(allowed_mechs);
- if (filtered_mechs == GSS_C_NO_OID_SET) {
+ if (filtered_mechs == allowed_mechs) {
+ /* in case filtered_mechs was not allocated here don't free it */
+ filtered_mechs = GSS_C_NO_OID_SET;
+ } else if (filtered_mechs == GSS_C_NO_OID_SET) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, req, "Fatal "
"failure while filtering mechs, aborting");
goto done;
- } else if (filtered_mechs != allowed_mechs) {
- /* if indicated_mechs where sourced then free them here before
- * reusing the pointer */
- gss_release_oid_set(&min, &indicated_mechs);
-
- /* mark the list of mechs needs to be freed */
- indicated_mechs = filtered_mechs;
-
+ } else {
/* use the filtered list */
allowed_mechs = filtered_mechs;
}
/* must acquire creds based on the actual mechs we want to try */
if (!mag_acquire_creds(req, cfg, actual_mechs,
- GSS_C_BOTH, &acquired_cred, NULL)) {
+ cred_usage, &acquired_cred, NULL)) {
goto done;
}
for (int i = 0; i < actual_mechs->count; i++) {
- /* skip spnego if present */
- if (gss_oid_equal(&actual_mechs->elements[i],
- &gss_mech_spnego)) {
- continue;
- }
-
/* free these if looping */
gss_release_buffer(&min, &output);
gss_release_buffer(&min, &input);
gss_release_cred(&min, &user_cred);
gss_delete_sec_context(&min, &user_ctx, GSS_C_NO_BUFFER);
gss_release_oid_set(&min, &actual_mechs);
- gss_release_oid_set(&min, &indicated_mechs);
+ gss_release_oid_set(&min, &filtered_mechs);
#ifdef HAVE_GSS_KRB5_CCACHE_NAME
if (user_ccache != NULL) {
maj = gss_krb5_ccache_name(&min, orig_ccache, NULL);
return ret;
}
+struct mag_req_cfg *mag_init_cfg(request_rec *req)
+{
+ struct mag_server_config *scfg;
+ struct mag_req_cfg *req_cfg = apr_pcalloc(req->pool,
+ sizeof(struct mag_req_cfg));
+ req_cfg->req = req;
+ req_cfg->cfg = ap_get_module_config(req->per_dir_config,
+ &auth_gssapi_module);
+
+ scfg = ap_get_module_config(req->server->module_config,
+ &auth_gssapi_module);
+
+ if (req_cfg->cfg->allowed_mechs) {
+ req_cfg->desired_mechs = req_cfg->cfg->allowed_mechs;
+ } else {
+ /* Use the default set if not explicitly configured */
+ req_cfg->desired_mechs = scfg->default_mechs;
+ }
+
+ if (!req_cfg->cfg->mag_skey) {
+ req_cfg->mag_skey = req_cfg->cfg->mag_skey;
+ } else {
+ /* Use server random key if not explicitly configured */
+ req_cfg->mag_skey = scfg->mag_skey;
+ }
+
+ if (req->proxyreq == PROXYREQ_PROXY) {
+ req_cfg->req_proto = "Proxy-Authorization";
+ req_cfg->rep_proto = "Proxy-Authenticate";
+ } else {
+ req_cfg->req_proto = "Authorization";
+ req_cfg->rep_proto = "WWW-Authenticate";
+ req_cfg->use_sessions = req_cfg->cfg->use_sessions;
+ req_cfg->send_persist = req_cfg->cfg->send_persist;
+ }
+
+ return req_cfg;
+}
+
+static bool use_s4u2proxy(struct mag_req_cfg *req_cfg) {
+ if (req_cfg->cfg->use_s4u2proxy) {
+ if (req_cfg->cfg->deleg_ccache_dir != NULL) {
+ return true;
+ } else {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req_cfg->req,
+ "S4U2 Proxy requested but GssapiDelegCcacheDir "
+ "is not set. Constrained delegation disabled!");
+ }
+ }
+ return false;
+}
static int mag_auth(request_rec *req)
{
const char *type;
int auth_type = -1;
+ struct mag_req_cfg *req_cfg;
struct mag_config *cfg;
const char *auth_header;
char *auth_header_type;
char *clientname;
gss_OID mech_type = GSS_C_NO_OID;
gss_OID_set desired_mechs = GSS_C_NO_OID_SET;
- gss_OID_set indicated_mechs = GSS_C_NO_OID_SET;
gss_buffer_desc lname = GSS_C_EMPTY_BUFFER;
struct mag_conn *mc = NULL;
time_t expiration;
return DECLINED;
}
- cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module);
+ req_cfg = mag_init_cfg(req);
- if (cfg->allowed_mechs) {
- desired_mechs = cfg->allowed_mechs;
- } else {
- /* Try to fetch the default set if not explicitly configured */
- maj = gss_indicate_mechs(&min, &indicated_mechs);
- if (maj != GSS_S_COMPLETE) {
- ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, req, "%s",
- mag_error(req, "gss_indicate_mechs() failed",
- maj, min));
- }
- desired_mechs = indicated_mechs;
- }
+ cfg = req_cfg->cfg;
+
+ desired_mechs = req_cfg->desired_mechs;
/* implicit auth for subrequests if main auth already happened */
if (!ap_is_initial_req(req) && req->main != NULL) {
}
/* if available, session always supersedes connection bound data */
- if (cfg->use_sessions) {
- mag_check_session(req, cfg, &mc);
+ if (req_cfg->use_sessions) {
+ mag_check_session(req_cfg, &mc);
}
- auth_header = apr_table_get(req->headers_in, "Authorization");
+ auth_header = apr_table_get(req->headers_in, req_cfg->req_proto);
if (mc) {
if (mc->established &&
ba_pwd.length = strlen(ba_pwd.value);
if (mc && mc->established &&
- mag_basic_check(cfg, mc, ba_user, ba_pwd)) {
+ mag_basic_check(req_cfg, mc, ba_user, ba_pwd)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
"Already established BASIC AUTH context found!");
mag_set_req_data(req, cfg, mc);
break;
case AUTH_TYPE_RAW_NTLM:
- if (!is_mech_allowed(cfg, &gss_mech_ntlmssp)) {
+ if (!is_mech_allowed(desired_mechs, &gss_mech_ntlmssp,
+ cfg->gss_conn_ctx)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
"NTLM Authentication is not allowed!");
goto done;
req->ap_auth_type = apr_pstrdup(req->pool, auth_types[auth_type]);
#ifdef HAVE_CRED_STORE
- if (cfg->use_s4u2proxy) {
+ if (use_s4u2proxy(req_cfg)) {
cred_usage = GSS_C_BOTH;
}
#endif
mc->expiration = expiration;
mc->auth_type = auth_type;
if (auth_type == AUTH_TYPE_BASIC) {
- mag_basic_cache(cfg, mc, ba_user, ba_pwd);
+ mag_basic_cache(req_cfg, mc, ba_user, ba_pwd);
}
- if (cfg->use_sessions) {
- mag_attempt_session(req, cfg, mc);
+ if (req_cfg->use_sessions) {
+ mag_attempt_session(req_cfg, mc);
}
}
- if (cfg->send_persist)
+ if (req_cfg->send_persist)
apr_table_set(req->headers_out, "Persistent-Auth",
cfg->gss_conn_ctx ? "true" : "false");
ret = OK;
done:
+
if ((auth_type != AUTH_TYPE_BASIC) && (output.length != 0)) {
int prefixlen = strlen(auth_types[auth_type]) + 1;
replen = apr_base64_encode_len(output.length) + 1;
memcpy(reply, auth_types[auth_type], prefixlen - 1);
reply[prefixlen - 1] = ' ';
apr_base64_encode(&reply[prefixlen], output.value, output.length);
- apr_table_add(req->err_headers_out,
- "WWW-Authenticate", reply);
+ apr_table_add(req->err_headers_out, req_cfg->rep_proto, reply);
}
} else if (ret == HTTP_UNAUTHORIZED) {
- apr_table_add(req->err_headers_out, "WWW-Authenticate", "Negotiate");
- if (is_mech_allowed(cfg, &gss_mech_ntlmssp)) {
- apr_table_add(req->err_headers_out, "WWW-Authenticate", "NTLM");
+ apr_table_add(req->err_headers_out, req_cfg->rep_proto, "Negotiate");
+
+ if (is_mech_allowed(desired_mechs, &gss_mech_ntlmssp,
+ cfg->gss_conn_ctx)) {
+ apr_table_add(req->err_headers_out, req_cfg->rep_proto, "NTLM");
}
if (cfg->use_basic_auth) {
- apr_table_add(req->err_headers_out,
- "WWW-Authenticate",
+ apr_table_add(req->err_headers_out, req_cfg->rep_proto,
apr_psprintf(req->pool, "Basic realm=\"%s\"",
ap_auth_name(req)));
}
}
- gss_release_oid_set(&min, &indicated_mechs);
+
if (ctx != GSS_C_NO_CONTEXT)
gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
gss_release_cred(&min, &acquired_cred);
struct mag_config *cfg = (struct mag_config *)mconfig;
cfg->use_s4u2proxy = on ? true : false;
- if (cfg->deleg_ccache_dir == NULL) {
- cfg->deleg_ccache_dir = apr_pstrdup(parms->pool, "/tmp");
- }
return NULL;
}
#endif
}
#endif
-#define MAX_ALLOWED_MECHS 10
+static apr_status_t mag_oid_set_destroy(void *ptr)
+{
+ uint32_t min;
+ gss_OID_set set = (gss_OID_set)ptr;
+ (void)gss_release_oid_set(&min, &set);
+ return APR_SUCCESS;
+}
-static void mag_list_of_mechs(cmd_parms *parms, gss_OID_set *oidset,
+static bool mag_list_of_mechs(cmd_parms *parms, gss_OID_set *oidset,
bool add_spnego, const char *w)
{
- gss_const_OID oid;
+ gss_buffer_desc buf = { 0 };
+ uint32_t maj, min;
gss_OID_set set;
- size_t size;
+ gss_OID oid;
+ bool release_oid = false;
if (NULL == *oidset) {
- set = apr_pcalloc(parms->pool, sizeof(gss_OID_set_desc));
- size = sizeof(gss_OID) * MAX_ALLOWED_MECHS;
- set->elements = apr_palloc(parms->pool, size);
+ maj = gss_create_empty_oid_set(&min, &set);
+ if (maj != GSS_S_COMPLETE) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
+ "gss_create_empty_oid_set() failed.");
+ *oidset = GSS_C_NO_OID_SET;
+ return false;
+ }
if (add_spnego) {
- set->elements[0] = gss_mech_spnego;
- set->count++;
+ oid = discard_const(&gss_mech_spnego);
+ maj = gss_add_oid_set_member(&min, oid, &set);
+ if (maj != GSS_S_COMPLETE) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
+ "gss_add_oid_set_member() failed.");
+ (void)gss_release_oid_set(&min, &set);
+ *oidset = GSS_C_NO_OID_SET;
+ return false;
+ }
}
+ /* register in the pool so it can be released once the server
+ * winds down */
+ apr_pool_cleanup_register(parms->pool, (void *)set,
+ mag_oid_set_destroy,
+ apr_pool_cleanup_null);
*oidset = set;
} else {
set = *oidset;
}
if (strcmp(w, "krb5") == 0) {
- oid = gss_mech_krb5;
+ oid = discard_const(gss_mech_krb5);
} else if (strcmp(w, "iakerb") == 0) {
- oid = gss_mech_iakerb;
+ oid = discard_const(gss_mech_iakerb);
} else if (strcmp(w, "ntlmssp") == 0) {
- oid = &gss_mech_ntlmssp;
+ oid = discard_const(&gss_mech_ntlmssp);
} else {
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
- "Unrecognized GSSAPI Mechanism: %s", w);
- return;
+ buf.value = discard_const(w);
+ buf.length = strlen(w);
+ maj = gss_str_to_oid(&min, &buf, &oid);
+ if (maj != GSS_S_COMPLETE) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
+ "Unrecognized GSSAPI Mechanism: [%s]", w);
+ return false;
+ }
+ release_oid = true;
}
-
- if (set->count >= MAX_ALLOWED_MECHS) {
+ maj = gss_add_oid_set_member(&min, oid, &set);
+ if (maj != GSS_S_COMPLETE) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
- "Too many GssapiAllowedMech options (MAX: %d)",
- MAX_ALLOWED_MECHS);
- return;
+ "gss_add_oid_set_member() failed for [%s].", w);
+ }
+ if (release_oid) {
+ (void)gss_release_oid(&min, &oid);
}
- set->elements[set->count] = *oid;
- set->count++;
+
+ return true;
}
static const char *mag_allow_mech(cmd_parms *parms, void *mconfig,
{
struct mag_config *cfg = (struct mag_config *)mconfig;
- mag_list_of_mechs(parms, &cfg->allowed_mechs, true, w);
+ if (!mag_list_of_mechs(parms, &cfg->allowed_mechs, true, w))
+ return "Failed to apply GssapiAllowedMech directive";
return NULL;
}
{
struct mag_config *cfg = (struct mag_config *)mconfig;
- mag_list_of_mechs(parms, &cfg->basic_mechs, false, w);
+ if (!mag_list_of_mechs(parms, &cfg->basic_mechs, false, w))
+ return "Failed to apply GssapiBasicAuthMech directive";
return NULL;
}
#endif
+static void *mag_create_server_config(apr_pool_t *p, server_rec *s)
+{
+ struct mag_server_config *scfg;
+ uint32_t maj, min;
+ apr_status_t rc;
+
+ scfg = apr_pcalloc(p, sizeof(struct mag_server_config));
+
+ maj = gss_indicate_mechs(&min, &scfg->default_mechs);
+ if (maj != GSS_S_COMPLETE) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
+ "gss_indicate_mechs() failed");
+ } else {
+ /* Register the set in pool */
+ apr_pool_cleanup_register(p, (void *)scfg->default_mechs,
+ mag_oid_set_destroy, apr_pool_cleanup_null);
+ }
+
+ rc = SEAL_KEY_CREATE(p, &scfg->mag_skey, NULL);
+ if (rc != OK) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
+ "Failed to generate random sealing key!");
+ }
+
+ return scfg;
+}
+
static const command_rec mag_commands[] = {
AP_INIT_FLAG("GssapiSSLonly", mag_ssl_only, NULL, OR_AUTHCFG,
"Work only if connection is SSL Secured"),
STANDARD20_MODULE_STUFF,
mag_create_dir_config,
NULL,
- NULL,
+ mag_create_server_config,
NULL,
mag_commands,
mag_register_hooks
projects / mod_auth_gssapi.git / blobdiff