DEALINGS IN THE SOFTWARE.
*/
-#include <stdbool.h>
-#include <stdint.h>
-#include <gssapi/gssapi.h>
-#include <gssapi/gssapi_ext.h>
-
-#include <httpd.h>
-#include <http_core.h>
-#include <http_connection.h>
-#include <http_log.h>
-#include <http_request.h>
-#include <apr_strings.h>
-#include <apr_base64.h>
+#include "mod_auth_gssapi.h"
+
+#define MOD_AUTH_GSSAPI_VERSION PACKAGE_NAME "/" PACKAGE_VERSION
module AP_MODULE_DECLARE_DATA auth_gssapi_module;
APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
-struct mag_config {
- bool ssl_only;
- bool map_to_local;
- bool gss_conn_ctx;
- gss_key_value_set_desc cred_store;
-};
-
static char *mag_status(request_rec *req, int type, uint32_t err)
{
uint32_t maj_ret, min_ret;
static APR_OPTIONAL_FN_TYPE(ssl_is_https) *mag_is_https = NULL;
-static int mag_post_config(apr_pool_t *cfg, apr_pool_t *log,
+static int mag_post_config(apr_pool_t *cfgpool, apr_pool_t *log,
apr_pool_t *temp, server_rec *s)
{
/* FIXME: create mutex to deal with connections and contexts ? */
mag_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
+ mag_post_config_session();
+ ap_add_version_component(cfgpool, MOD_AUTH_GSSAPI_VERSION);
return OK;
}
-
-struct mag_conn {
- apr_pool_t *parent;
- gss_ctx_id_t ctx;
- bool established;
- char *user_name;
- char *gss_name;
-};
-
static int mag_pre_connection(conn_rec *c, void *csd)
{
struct mag_conn *mc;
return false;
}
+static void mag_store_deleg_creds(request_rec *req,
+ char *dir, char *clientname,
+ gss_cred_id_t delegated_cred,
+ char **ccachefile)
+{
+ gss_key_value_element_desc element;
+ gss_key_value_set_desc store;
+ char *value;
+ uint32_t maj, min;
+
+ value = apr_psprintf(req->pool, "FILE:%s/%s", dir, clientname);
+ if (!value) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, NULL,
+ "OOM storing delegated credentials");
+ return;
+ }
+
+ element.key = "ccache";
+ element.value = value;
+ store.elements = &element;
+ store.count = 1;
+
+ maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
+ GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
+ if (GSS_ERROR(maj)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "%s",
+ mag_error(req, "failed to store delegated creds",
+ maj, min));
+ }
+
+ *ccachefile = value;
+}
+
static int mag_auth(request_rec *req)
{
const char *type;
gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
gss_name_t client = GSS_C_NO_NAME;
+ gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
+ gss_cred_usage_t cred_usage = GSS_C_ACCEPT;
uint32_t flags;
+ uint32_t vtime;
uint32_t maj, min;
char *reply;
size_t replen;
return DECLINED;
}
+ /* ignore auth for subrequests */
+ if (!ap_is_initial_req(req)) {
+ return OK;
+ }
+
cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module);
if (cfg->ssl_only) {
req->connection->conn_config,
&auth_gssapi_module);
if (!mc) {
- return DECLINED;
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, req,
+ "Failed to retrieve connection context!");
+ goto done;
}
+ }
+
+ /* if available, session always supersedes connection bound data */
+ if (cfg->use_sessions) {
+ mag_check_session(req, cfg, &mc);
+ }
+
+ if (mc) {
+ /* register the context in the memory pool, so it can be freed
+ * when the connection/request is terminated */
+ apr_pool_userdata_set(mc, "mag_conn_ptr",
+ mag_conn_destroy, mc->parent);
+
if (mc->established) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, req,
- "Connection bound pre-authentication found.");
+ "Already established context found!");
apr_table_set(req->subprocess_env, "GSS_NAME", mc->gss_name);
req->ap_auth_type = apr_pstrdup(req->pool, "Negotiate");
req->user = apr_pstrdup(req->pool, mc->user_name);
if (!input.value) goto done;
input.length = apr_base64_decode(input.value, auth_header_value);
- maj = gss_accept_sec_context(&min, pctx, GSS_C_NO_CREDENTIAL,
+#ifdef HAVE_GSS_ACQUIRE_CRED_FROM
+ if (cfg->use_s4u2proxy) {
+ cred_usage = GSS_C_BOTH;
+ }
+ if (cfg->cred_store) {
+ maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME, 0,
+ GSS_C_NO_OID_SET, cred_usage,
+ cfg->cred_store, &acquired_cred,
+ NULL, NULL);
+ if (GSS_ERROR(maj)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "%s",
+ mag_error(req, "gss_acquire_cred_from() failed",
+ maj, min));
+ goto done;
+ }
+ }
+#endif
+
+ maj = gss_accept_sec_context(&min, pctx, acquired_cred,
&input, GSS_C_NO_CHANNEL_BINDINGS,
- &client, &mech_type, &output, &flags, NULL,
+ &client, &mech_type, &output, &flags, &vtime,
&delegated_cred);
if (GSS_ERROR(maj)) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "%s",
mag_error(req, "gss_accept_sec_context() failed",
maj, min));
goto done;
}
- /* register the context in the connection pool, so it can be freed
- * when the connection is terminated */
- apr_pool_userdata_set(mc, "mag_conn_ptr", mag_conn_destroy, mc->parent);
-
if (maj == GSS_S_CONTINUE_NEEDED) {
- if (!cfg->gss_conn_ctx) {
+ if (!mc) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
- "Mechanism needs continuation but "
- "GssapiConnectionBound is off.");
+ "Mechanism needs continuation but neither "
+ "GssapiConnectionBound nor "
+ "GssapiUseSessions are available");
gss_delete_sec_context(&min, pctx, GSS_C_NO_BUFFER);
gss_release_buffer(&min, &output);
output.length = 0;
}
+ /* auth not complete send token and wait next packet */
goto done;
}
-#ifdef HAVE_GSS_STORE_CRED_INTO
- if (cfg->cred_store && delegated_cred != GSS_C_NO_CREDENTIAL) {
- gss_key_value_set_desc store = {0, NULL};
- /* FIXME: run substtutions */
-
- maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
- GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
- }
-#endif
-
req->ap_auth_type = apr_pstrdup(req->pool, "Negotiate");
/* Always set the GSS name in an env var */
maj = gss_display_name(&min, client, &name, NULL);
if (GSS_ERROR(maj)) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "%s",
mag_error(req, "gss_accept_sec_context() failed",
maj, min));
goto done;
clientname = apr_pstrndup(req->pool, name.value, name.length);
apr_table_set(req->subprocess_env, "GSS_NAME", clientname);
+#ifdef HAVE_GSS_STORE_CRED_INTO
+ if (cfg->deleg_ccache_dir && delegated_cred != GSS_C_NO_CREDENTIAL) {
+ char *ccachefile = NULL;
+
+ mag_store_deleg_creds(req, cfg->deleg_ccache_dir, clientname,
+ delegated_cred, &ccachefile);
+
+ if (ccachefile) {
+ apr_table_set(req->subprocess_env, "KRB5CCNAME", ccachefile);
+ }
+ }
+#endif
+
if (cfg->map_to_local) {
maj = gss_localname(&min, client, mech_type, &lname);
if (maj != GSS_S_COMPLETE) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "%s",
mag_error(req, "gss_localname() failed", maj, min));
goto done;
}
mc->user_name = apr_pstrdup(mc->parent, req->user);
mc->gss_name = apr_pstrdup(mc->parent, clientname);
mc->established = true;
+ if (vtime == GSS_C_INDEFINITE || vtime < MIN_SESS_EXP_TIME) {
+ vtime = MIN_SESS_EXP_TIME;
+ }
+ mc->expiration = time(NULL) + vtime;
+ if (cfg->use_sessions) {
+ mag_attempt_session(req, cfg, mc);
+ }
}
ret = OK;
cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
if (!cfg) return NULL;
+ cfg->pool = p;
return cfg;
}
return NULL;
}
+static const char *mag_use_sess(cmd_parms *parms, void *mconfig, int on)
+{
+ struct mag_config *cfg = (struct mag_config *)mconfig;
+ cfg->use_sessions = on ? true : false;
+ return NULL;
+}
+
+static const char *mag_use_s4u2p(cmd_parms *parms, void *mconfig, int on)
+{
+ 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");
+ if (!cfg->deleg_ccache_dir) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0,
+ parms->server, "%s", "OOM setting deleg_ccache_dir.");
+ }
+ }
+ return NULL;
+}
+
+static const char *mag_sess_key(cmd_parms *parms, void *mconfig, const char *w)
+{
+ struct mag_config *cfg = (struct mag_config *)mconfig;
+ struct databuf keys;
+ unsigned char *val;
+ apr_status_t rc;
+ const char *k;
+ int l;
+
+ if (strncmp(w, "key:", 4) != 0) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "Invalid key format, expected prefix 'key:'");
+ return NULL;
+ }
+ k = w + 4;
+
+ l = apr_base64_decode_len(k);
+ val = apr_palloc(parms->temp_pool, l);
+ if (!val) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "Failed to get memory to decode key");
+ return NULL;
+ }
+
+ keys.length = (int)apr_base64_decode_binary(val, k);
+ keys.value = (unsigned char *)val;
+
+ if (keys.length != 32) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "Invalid key lenght, expected 32 got %d", keys.length);
+ return NULL;
+ }
+
+ rc = SEAL_KEY_CREATE(cfg->pool, &cfg->mag_skey, &keys);
+ if (rc != OK) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "Failed to import sealing key!");
+ }
+ return NULL;
+}
+
+#define MAX_CRED_OPTIONS 10
+
static const char *mag_cred_store(cmd_parms *parms, void *mconfig,
const char *w)
{
return NULL;
}
- size = sizeof(gss_key_value_element_desc) * cfg->cred_store.count + 1;
- elements = apr_palloc(parms->pool, size);
- if (!elements) {
+ if (!cfg->cred_store) {
+ cfg->cred_store = apr_pcalloc(parms->pool,
+ sizeof(gss_key_value_set_desc));
+ if (!cfg->cred_store) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "%s", "OOM handling GssapiCredStore option");
+ return NULL;
+ }
+ size = sizeof(gss_key_value_element_desc) * MAX_CRED_OPTIONS;
+ cfg->cred_store->elements = apr_palloc(parms->pool, size);
+ if (!cfg->cred_store->elements) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "%s", "OOM handling GssapiCredStore option");
+ }
+ }
+
+ elements = cfg->cred_store->elements;
+ count = cfg->cred_store->count;
+
+ if (count >= MAX_CRED_OPTIONS) {
ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
- "%s", "OOM handling GssapiCredStore option");
+ "Too many GssapiCredStore options (MAX: %d)",
+ MAX_CRED_OPTIONS);
return NULL;
}
+ cfg->cred_store->count++;
- for (count = 0; count < cfg->cred_store.count; count++) {
- elements[count] = cfg->cred_store.elements[count];
- }
elements[count].key = key;
elements[count].value = value;
- cfg->cred_store.elements = elements;
- cfg->cred_store.count = count;
+ return NULL;
+}
+
+static const char *mag_deleg_ccache_dir(cmd_parms *parms, void *mconfig,
+ const char *value)
+{
+ struct mag_config *cfg = (struct mag_config *)mconfig;
+
+ cfg->deleg_ccache_dir = apr_pstrdup(parms->pool, value);
+ if (!cfg->deleg_ccache_dir) {
+ ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
+ "%s", "OOM handling GssapiDelegCcacheDir option");
+ }
return NULL;
}
AP_INIT_FLAG("GssapiSSLonly", mag_ssl_only, NULL, OR_AUTHCFG,
"Work only if connection is SSL Secured"),
AP_INIT_FLAG("GssapiLocalName", mag_map_to_local, NULL, OR_AUTHCFG,
- "Work only if connection is SSL Secured"),
+ "Translate principals to local names"),
AP_INIT_FLAG("GssapiConnectionBound", mag_conn_ctx, NULL, OR_AUTHCFG,
"Authentication is bound to the TCP connection"),
+ AP_INIT_FLAG("GssapiUseSessions", mag_use_sess, NULL, OR_AUTHCFG,
+ "Authentication uses mod_sessions to hold status"),
+ AP_INIT_RAW_ARGS("GssapiSessionKey", mag_sess_key, NULL, OR_AUTHCFG,
+ "Key Used to seal session data."),
+#ifdef HAVE_GSS_ACQUIRE_CRED_FROM
+ AP_INIT_FLAG("GssapiUseS4U2Proxy", mag_use_s4u2p, NULL, OR_AUTHCFG,
+ "Initializes credentials for s4u2proxy usage"),
+#endif
+#ifdef HAVE_GSS_STORE_CRED_INTO
AP_INIT_ITERATE("GssapiCredStore", mag_cred_store, NULL, OR_AUTHCFG,
"Credential Store"),
+ AP_INIT_RAW_ARGS("GssapiDelegCcacheDir", mag_deleg_ccache_dir, NULL,
+ OR_AUTHCFG, "Directory to store delegated credentials"),
+#endif
{ NULL }
};
projects / mod_auth_gssapi.git / blobdiff