#include "mod_auth_gssapi.h"
+const gss_OID_desc gss_mech_ntlmssp = {
+ GSS_NTLMSSP_OID_LENGTH, GSS_NTLMSSP_OID_STRING
+};
+
+const gss_OID_set_desc gss_mech_set_ntlmssp = {
+ 1, discard_const(&gss_mech_ntlmssp)
+};
+
#define MOD_AUTH_GSSAPI_VERSION PACKAGE_NAME "/" PACKAGE_VERSION
module AP_MODULE_DECLARE_DATA auth_gssapi_module;
return false;
}
+static bool mag_acquire_creds(request_rec *req,
+ struct mag_config *cfg,
+ gss_OID_set desired_mechs,
+ gss_cred_usage_t cred_usage,
+ gss_cred_id_t *creds,
+ gss_OID_set *actual_mechs)
+{
+ uint32_t maj, min;
+#ifdef HAVE_CRED_STORE
+ gss_const_key_value_set_t store = cfg->cred_store;
+
+ maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
+ desired_mechs, cred_usage, store, creds,
+ actual_mechs, NULL);
+#else
+ maj = gss_acquire_cred(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
+ desired_mechs, cred_usage, creds,
+ actual_mechs, NULL);
+#endif
+
+ if (GSS_ERROR(maj)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
+ mag_error(req, "gss_acquire_cred[_from]() "
+ "failed to get server creds",
+ maj, min));
+ return false;
+ }
+
+ return true;
+}
+
+#ifdef HAVE_CRED_STORE
static char *escape(apr_pool_t *pool, const char *name,
char find, const char *replace)
{
return escaped;
}
-static void mag_store_deleg_creds(request_rec *req,
- char *dir, char *clientname,
- gss_cred_id_t delegated_cred,
- char **ccachefile)
+static char *mag_gss_name_to_ccache_name(request_rec *req,
+ char *dir, const char *gss_name)
{
- gss_key_value_element_desc element;
- gss_key_value_set_desc store;
- char *value;
- uint32_t maj, min;
char *escaped;
/* We need to escape away '/', we can't have path separators in
* a ccache file name */
/* first double escape the esacping char (~) if any */
- escaped = escape(req->pool, clientname, '~', "~~");
- if (!escaped) return;
+ escaped = escape(req->pool, gss_name, '~', "~~");
/* then escape away the separator (/) if any */
escaped = escape(req->pool, escaped, '/', "~");
- if (!escaped) return;
- value = apr_psprintf(req->pool, "FILE:%s/%s", dir, escaped);
+ return apr_psprintf(req->pool, "%s/%s", dir, escaped);
+}
+
+static void mag_set_KRB5CCANME(request_rec *req, char *ccname)
+{
+ apr_status_t status;
+ apr_finfo_t finfo;
+ char *value;
+ status = apr_stat(&finfo, ccname, APR_FINFO_MIN, req->pool);
+ if (status != APR_SUCCESS && status != APR_INCOMPLETE) {
+ /* set the file cache anyway, but warn */
+ ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
+ "KRB5CCNAME file (%s) lookup failed!", ccname);
+ }
+
+ value = apr_psprintf(req->pool, "FILE:%s", ccname);
+ apr_table_set(req->subprocess_env, "KRB5CCNAME", value);
+}
+
+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 *ccname;
+ uint32_t maj, min;
element.key = "ccache";
- element.value = value;
store.elements = &element;
store.count = 1;
+ ccname = mag_gss_name_to_ccache_name(req, dir, clientname);
+ element.value = apr_psprintf(req->pool, "FILE:%s", ccname);
+
maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
if (GSS_ERROR(maj)) {
maj, min));
}
- *ccachefile = value;
+ *ccachefile = ccname;
+}
+#endif
+
+static bool parse_auth_header(apr_pool_t *pool, const char **auth_header,
+ gss_buffer_t value)
+{
+ char *auth_header_value;
+
+ auth_header_value = ap_getword_white(pool, auth_header);
+ if (!auth_header_value) return false;
+ value->length = apr_base64_decode_len(auth_header_value) + 1;
+ value->value = apr_pcalloc(pool, value->length);
+ if (!value->value) return false;
+ value->length = apr_base64_decode(value->value, auth_header_value);
+
+ return true;
+}
+
+static bool is_mech_allowed(struct mag_config *cfg, gss_const_OID mech)
+{
+ if (cfg->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)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+#define AUTH_TYPE_NEGOTIATE 0
+#define AUTH_TYPE_BASIC 1
+#define AUTH_TYPE_RAW_NTLM 2
+const char *auth_types[] = {
+ "Negotiate",
+ "Basic",
+ "NTLM",
+ NULL
+};
+
+static void mag_set_req_data(request_rec *req,
+ struct mag_config *cfg,
+ struct mag_conn *mc)
+{
+ apr_table_set(req->subprocess_env, "GSS_NAME", mc->gss_name);
+ apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION",
+ apr_psprintf(req->pool,
+ "%ld", (long)mc->expiration));
+ req->ap_auth_type = apr_pstrdup(req->pool,
+ auth_types[mc->auth_type]);
+ req->user = apr_pstrdup(req->pool, mc->user_name);
+ if (cfg->deleg_ccache_dir && mc->delegated) {
+ char *ccname;
+ ccname = mag_gss_name_to_ccache_name(req,
+ cfg->deleg_ccache_dir,
+ mc->gss_name);
+ if (ccname) {
+ mag_set_KRB5CCANME(req, ccname);
+ }
+ }
}
static int mag_auth(request_rec *req)
{
const char *type;
- const char *auth_type;
+ int auth_type = -1;
struct mag_config *cfg;
const char *auth_header;
char *auth_header_type;
- char *auth_header_value;
int ret = HTTP_UNAUTHORIZED;
gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
gss_ctx_id_t *pctx;
gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc ba_user;
+ gss_buffer_desc ba_pwd;
gss_name_t client = GSS_C_NO_NAME;
gss_cred_id_t user_cred = GSS_C_NO_CREDENTIAL;
gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
size_t replen;
char *clientname;
gss_OID mech_type = GSS_C_NO_OID;
+ gss_OID_set desired_mechs = GSS_C_NO_OID_SET;
gss_buffer_desc lname = GSS_C_EMPTY_BUFFER;
struct mag_conn *mc = NULL;
- bool is_basic = false;
gss_ctx_id_t user_ctx = GSS_C_NO_CONTEXT;
gss_name_t server = GSS_C_NO_NAME;
#ifdef HAVE_GSS_KRB5_CCACHE_NAME
#endif
uint32_t init_flags = 0;
time_t expiration;
+ int i;
type = ap_auth_type(req);
if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) {
cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module);
+ if (!cfg->allowed_mechs) {
+ /* Try to fetch the default set if not explicitly configured */
+ (void)mag_acquire_creds(req, cfg, GSS_C_NO_OID_SET, GSS_C_ACCEPT,
+ &server_cred, &cfg->allowed_mechs);
+ (void)gss_release_cred(&min, &server_cred);
+ }
+
/* implicit auth for subrequests if main auth already happened */
- if (!ap_is_initial_req(req)) {
+ if (!ap_is_initial_req(req) && req->main != NULL) {
type = ap_auth_type(req->main);
if ((type != NULL) && (strcasecmp(type, "GSSAPI") == 0)) {
/* warn if the subrequest location and the main request
mag_check_session(req, cfg, &mc);
}
+ auth_header = apr_table_get(req->headers_in, "Authorization");
+
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) {
+ if (mc->established && !auth_header) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
"Already established context found!");
- apr_table_set(req->subprocess_env, "GSS_NAME", mc->gss_name);
- apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION",
- apr_psprintf(req->pool,
- "%ld", (long)mc->expiration));
- req->ap_auth_type = apr_pstrdup(req->pool, mc->auth_type);
- req->user = apr_pstrdup(req->pool, mc->user_name);
- ret = OK;
- goto done;
+ mag_set_req_data(req, cfg, mc);
}
pctx = &mc->ctx;
} else {
pctx = &ctx;
}
- auth_header = apr_table_get(req->headers_in, "Authorization");
+ /* We can proceed only if we do have an auth header */
if (!auth_header) goto done;
auth_header_type = ap_getword_white(req->pool, &auth_header);
if (!auth_header_type) goto done;
- if (strcasecmp(auth_header_type, "Negotiate") == 0) {
- auth_type = "Negotiate";
-
- auth_header_value = ap_getword_white(req->pool, &auth_header);
- if (!auth_header_value) goto done;
- input.length = apr_base64_decode_len(auth_header_value) + 1;
- input.value = apr_pcalloc(req->pool, input.length);
- if (!input.value) goto done;
- input.length = apr_base64_decode(input.value, auth_header_value);
- } else if ((strcasecmp(auth_header_type, "Basic") == 0) &&
- (cfg->use_basic_auth == true)) {
- auth_type = "Basic";
- is_basic = true;
+ for (i = 0; auth_types[i] != NULL; i++) {
+ if (strcasecmp(auth_header_type, auth_types[i]) == 0) {
+ auth_type = i;
+ break;
+ }
+ }
- gss_buffer_desc ba_user;
- gss_buffer_desc ba_pwd;
+ switch (auth_type) {
+ case AUTH_TYPE_NEGOTIATE:
+ if (!parse_auth_header(req->pool, &auth_header, &input)) {
+ goto done;
+ }
+ break;
+ case AUTH_TYPE_BASIC:
+ if (!cfg->use_basic_auth) {
+ goto done;
+ }
ba_pwd.value = ap_pbase64decode(req->pool, auth_header);
if (!ba_pwd.value) goto done;
}
ba_user.length = strlen(ba_user.value);
ba_pwd.length = strlen(ba_pwd.value);
+
+ if (mc && mc->established &&
+ mag_basic_check(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);
+ ret = OK;
+ goto done;
+ }
+
maj = gss_import_name(&min, &ba_user, GSS_C_NT_USER_NAME, &client);
if (GSS_ERROR(maj)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
#endif
maj = gss_acquire_cred_with_password(&min, client, &ba_pwd,
GSS_C_INDEFINITE,
- GSS_C_NO_OID_SET,
+ cfg->allowed_mechs,
GSS_C_INITIATE,
&user_cred, NULL, NULL);
if (GSS_ERROR(maj)) {
goto done;
}
gss_release_name(&min, &client);
- } else {
+ break;
+
+ case AUTH_TYPE_RAW_NTLM:
+ if (!is_mech_allowed(cfg, &gss_mech_ntlmssp)) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
+ "NTLM Authentication is not allowed!");
+ goto done;
+ }
+
+ if (!parse_auth_header(req->pool, &auth_header, &input)) {
+ goto done;
+ }
+
+ desired_mechs = discard_const(&gss_mech_set_ntlmssp);
+ break;
+
+ default:
goto done;
}
- req->ap_auth_type = apr_pstrdup(req->pool, auth_type);
+ req->ap_auth_type = apr_pstrdup(req->pool, auth_types[auth_type]);
-#ifdef HAVE_GSS_ACQUIRE_CRED_FROM
+#ifdef HAVE_CRED_STORE
if (cfg->use_s4u2proxy) {
cred_usage = GSS_C_BOTH;
}
- if (cfg->cred_store) {
- maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
- 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, 0, req, "%s",
- mag_error(req, "gss_acquire_cred_from() failed",
- maj, min));
- goto done;
- }
- }
#endif
+ if (!mag_acquire_creds(req, cfg, desired_mechs,
+ cred_usage, &acquired_cred, NULL)) {
+ goto done;
+ }
- if (is_basic) {
- if (!acquired_cred) {
- /* Try to acquire default creds */
- maj = gss_acquire_cred(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
- GSS_C_NO_OID_SET, cred_usage,
- &acquired_cred, NULL, NULL);
- if (GSS_ERROR(maj)) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
- "%s", mag_error(req, "gss_acquire_cred()"
- " failed", maj, min));
- goto done;
- }
- }
+ if (auth_type == AUTH_TYPE_BASIC) {
if (cred_usage == GSS_C_BOTH) {
/* If GSS_C_BOTH is used then inquire_cred will return the client
* name instead of the SPN of the server credentials. Therefore we
* need to acquire a different set of credential setting
* GSS_C_ACCEPT explicitly */
-#ifdef HAVE_GSS_ACQUIRE_CRED_FROM
- if (cfg->cred_store) {
- maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME,
- GSS_C_INDEFINITE, GSS_C_NO_OID_SET,
- GSS_C_ACCEPT, cfg->cred_store,
- &server_cred, NULL, NULL);
- } else {
-#else
- {
-#endif
- /* Try to acquire default creds */
- maj = gss_acquire_cred(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
- GSS_C_NO_OID_SET, GSS_C_ACCEPT,
- &server_cred, NULL, NULL);
- }
- if (GSS_ERROR(maj)) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
- mag_error(req, "gss_acquire_cred[_from]() "
- "failed to get server creds",
- maj, min));
+ if (!mag_acquire_creds(req, cfg, cfg->allowed_mechs,
+ GSS_C_ACCEPT, &server_cred, NULL)) {
goto done;
}
} else {
gss_release_cred(&min, &server_cred);
}
+#ifdef HAVE_CRED_STORE
if (cfg->deleg_ccache_dir) {
/* delegate ourselves credentials so we store them as requested */
init_flags |= GSS_C_DELEG_FLAG;
}
+#endif
/* output and input are inverted here, this is intentional */
maj = gss_init_sec_context(&min, user_cred, &user_ctx, server,
}
}
+ if (auth_type == AUTH_TYPE_NEGOTIATE &&
+ cfg->allowed_mechs != GSS_C_NO_OID_SET) {
+ maj = gss_set_neg_mechs(&min, acquired_cred, cfg->allowed_mechs);
+ if (GSS_ERROR(maj)) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
+ mag_error(req, "gss_set_neg_mechs() failed",
+ maj, min));
+ goto done;
+ }
+ }
+
maj = gss_accept_sec_context(&min, pctx, acquired_cred,
&input, GSS_C_NO_CHANNEL_BINDINGS,
&client, &mech_type, &output, &flags, &vtime,
maj, min));
goto done;
}
- if (is_basic) {
+ if (auth_type == AUTH_TYPE_BASIC) {
while (maj == GSS_S_CONTINUE_NEEDED) {
gss_release_buffer(&min, &input);
/* output and input are inverted here, this is intentional */
"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;
}
apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION",
apr_psprintf(req->pool, "%ld", (long)expiration));
-#ifdef HAVE_GSS_STORE_CRED_INTO
+#ifdef HAVE_CRED_STORE
if (cfg->deleg_ccache_dir && delegated_cred != GSS_C_NO_CREDENTIAL) {
char *ccachefile = NULL;
delegated_cred, &ccachefile);
if (ccachefile) {
- apr_table_set(req->subprocess_env, "KRB5CCNAME", ccachefile);
+ mag_set_KRB5CCANME(req, ccachefile);
+ }
+
+ if (mc) {
+ mc->delegated = true;
}
}
#endif
vtime = MIN_SESS_EXP_TIME;
}
mc->expiration = expiration;
+ mc->auth_type = auth_type;
+ if (auth_type == AUTH_TYPE_BASIC) {
+ mag_basic_cache(cfg, mc, ba_user, ba_pwd);
+ }
if (cfg->use_sessions) {
mag_attempt_session(req, cfg, mc);
}
- mc->auth_type = auth_type;
}
if (cfg->send_persist)
ret = OK;
done:
- if ((!is_basic) && (output.length != 0)) {
+ 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;
- reply = apr_pcalloc(req->pool, 10 + replen);
+ reply = apr_pcalloc(req->pool, prefixlen + replen);
if (reply) {
- memcpy(reply, "Negotiate ", 10);
- apr_base64_encode(&reply[10], output.value, output.length);
+ 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);
}
} else if (ret == HTTP_UNAUTHORIZED) {
- apr_table_add(req->err_headers_out,
- "WWW-Authenticate", "Negotiate");
+ 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");
+ }
if (cfg->use_basic_auth) {
apr_table_add(req->err_headers_out,
"WWW-Authenticate",
}
}
#endif
- gss_delete_sec_context(&min, &user_ctx, &output);
+ if (ctx != GSS_C_NO_CONTEXT)
+ gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
+ gss_delete_sec_context(&min, &user_ctx, GSS_C_NO_BUFFER);
gss_release_cred(&min, &user_cred);
gss_release_cred(&min, &acquired_cred);
gss_release_cred(&min, &delegated_cred);
return NULL;
}
+#ifdef HAVE_CRED_STORE
static const char *mag_use_s4u2p(cmd_parms *parms, void *mconfig, int on)
{
struct mag_config *cfg = (struct mag_config *)mconfig;
}
return NULL;
}
+#endif
static const char *mag_sess_key(cmd_parms *parms, void *mconfig, const char *w)
{
return NULL;
}
+#ifdef HAVE_CRED_STORE
+
#define MAX_CRED_OPTIONS 10
static const char *mag_cred_store(cmd_parms *parms, void *mconfig,
return NULL;
}
+#endif
static const char *mag_use_basic_auth(cmd_parms *parms, void *mconfig, int on)
{
return NULL;
}
+#define MAX_ALLOWED_MECHS 10
+
+static const char *mag_allow_mech(cmd_parms *parms, void *mconfig,
+ const char *w)
+{
+ struct mag_config *cfg = (struct mag_config *)mconfig;
+ gss_const_OID oid;
+ size_t size;
+
+ if (!cfg->allowed_mechs) {
+ cfg->allowed_mechs = apr_pcalloc(parms->pool,
+ sizeof(gss_OID_set_desc));
+ size = sizeof(gss_OID) * MAX_ALLOWED_MECHS;
+ cfg->allowed_mechs->elements = apr_palloc(parms->pool, size);
+ }
+
+ if (strcmp(w, "krb5") == 0) {
+ oid = gss_mech_krb5;
+ } else if (strcmp(w, "iakerb") == 0) {
+ oid = gss_mech_iakerb;
+ } else if (strcmp(w, "ntlmssp") == 0) {
+ oid = &gss_mech_ntlmssp;
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
+ "Unrecognized GSSAPI Mechanism: %s", w);
+ return NULL;
+ }
+
+ if (cfg->allowed_mechs->count >= MAX_ALLOWED_MECHS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
+ "Too many GssapiAllowedMech options (MAX: %d)",
+ MAX_ALLOWED_MECHS);
+ return NULL;
+ }
+ cfg->allowed_mechs->elements[cfg->allowed_mechs->count] = *oid;
+ cfg->allowed_mechs->count++;
+
+ return NULL;
+}
+
static const command_rec mag_commands[] = {
AP_INIT_FLAG("GssapiSSLonly", mag_ssl_only, NULL, OR_AUTHCFG,
"Work only if connection is SSL Secured"),
"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
+#ifdef HAVE_CRED_STORE
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,
AP_INIT_FLAG("GssapiBasicAuth", mag_use_basic_auth, NULL, OR_AUTHCFG,
"Allows use of Basic Auth for authentication"),
#endif
+ AP_INIT_ITERATE("GssapiAllowedMech", mag_allow_mech, NULL, OR_AUTHCFG,
+ "Allowed Mechanisms"),
{ NULL }
};