X-Git-Url: http://www.project-moonshot.org/gitweb/?p=mod_auth_gssapi.git;a=blobdiff_plain;f=src%2Fmod_auth_gssapi.c;h=48300e93467fd8bccfc1412e6d4fc156590b2022;hp=f2fab579b02a3ffb4db496a07451a3fd42975d9f;hb=fafb5384785c76c1f96cc689677574cfe459f3b6;hpb=aa4f8f9c06eec26248f068f445fe2412cb6f467b diff --git a/src/mod_auth_gssapi.c b/src/mod_auth_gssapi.c index f2fab57..48300e9 100644 --- a/src/mod_auth_gssapi.c +++ b/src/mod_auth_gssapi.c @@ -119,6 +119,48 @@ static bool mag_conn_is_https(conn_rec *c) return false; } +static char *escape(apr_pool_t *pool, const char *name, + char find, const char *replace) +{ + char *escaped = NULL; + char *namecopy; + char *n; + char *p; + + namecopy = apr_pstrdup(pool, name); + if (!namecopy) goto done; + + p = strchr(namecopy, find); + if (!p) return namecopy; + + /* first segment */ + n = namecopy; + while (p) { + /* terminate previous segment */ + *p = '\0'; + if (escaped) { + escaped = apr_pstrcat(pool, escaped, n, replace, NULL); + } else { + escaped = apr_pstrcat(pool, n, replace, NULL); + } + if (!escaped) goto done; + /* move to next segment */ + n = p + 1; + p = strchr(n, find); + } + /* append last segment if any */ + if (*n) { + escaped = apr_pstrcat(pool, escaped, n, NULL); + } + +done: + if (!escaped) { + ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, NULL, + "OOM escaping name"); + } + return escaped; +} + static void mag_store_deleg_creds(request_rec *req, char *dir, char *clientname, gss_cred_id_t delegated_cred, @@ -128,8 +170,18 @@ static void mag_store_deleg_creds(request_rec *req, gss_key_value_set_desc store; char *value; uint32_t maj, min; - - value = apr_psprintf(req->pool, "FILE:%s/%s", dir, clientname); + 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; + /* 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); if (!value) { ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, NULL, "OOM storing delegated credentials"); @@ -155,6 +207,7 @@ static void mag_store_deleg_creds(request_rec *req, static int mag_auth(request_rec *req) { const char *type; + const char *auth_type; struct mag_config *cfg; const char *auth_header; char *auth_header_type; @@ -166,6 +219,7 @@ static int mag_auth(request_rec *req) 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 user_cred = GSS_C_NO_CREDENTIAL; 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; @@ -178,19 +232,53 @@ static int mag_auth(request_rec *req) gss_OID mech_type = GSS_C_NO_OID; 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 + const char *user_ccache = NULL; + const char *orig_ccache = NULL; +#endif + uint32_t init_flags = 0; + time_t expiration; type = ap_auth_type(req); if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) { return DECLINED; } - /* ignore auth for subrequests */ + cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module); + + /* implicit auth for subrequests if main auth already happened */ if (!ap_is_initial_req(req)) { - return OK; + type = ap_auth_type(req->main); + if ((type != NULL) && (strcasecmp(type, "GSSAPI") == 0)) { + /* warn if the subrequest location and the main request + * location have different configs */ + if (cfg != ap_get_module_config(req->main->per_dir_config, + &auth_gssapi_module)) { + ap_log_rerror(APLOG_MARK, APLOG_WARNING||APLOG_NOERRNO, 0, + req, "Subrequest authentication bypass on " + "location with different configuration!"); + } + if (req->main->user) { + req->user = apr_pstrdup(req->pool, req->main->user); + return OK; + } else { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "The main request is tasked to establish the " + "security context, can't proceed!"); + return HTTP_UNAUTHORIZED; + } + } else { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, req, + "Subrequest GSSAPI auth with no auth on the main " + "request. This operation may fail if other " + "subrequests already established a context or the " + "mechanism requires multiple roundtrips."); + } } - cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module); - if (cfg->ssl_only) { if (!mag_conn_is_https(req->connection)) { ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, @@ -225,7 +313,10 @@ static int mag_auth(request_rec *req) ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, req, "Already established context found!"); apr_table_set(req->subprocess_env, "GSS_NAME", mc->gss_name); - req->ap_auth_type = apr_pstrdup(req->pool, "Negotiate"); + 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; @@ -241,21 +332,91 @@ static int mag_auth(request_rec *req) auth_header_type = ap_getword_white(req->pool, &auth_header); if (!auth_header_type) goto done; - if (strcasecmp(auth_header_type, "Negotiate") != 0) 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; + + gss_buffer_desc ba_user; + gss_buffer_desc ba_pwd; + + ba_pwd.value = ap_pbase64decode(req->pool, auth_header); + if (!ba_pwd.value) goto done; + ba_user.value = ap_getword_nulls_nc(req->pool, + (char **)&ba_pwd.value, ':'); + if (!ba_user.value) goto done; + if (((char *)ba_user.value)[0] == '\0' || + ((char *)ba_pwd.value)[0] == '\0') { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "Invalid empty user or password for Basic Auth"); + goto done; + } + ba_user.length = strlen(ba_user.value); + ba_pwd.length = strlen(ba_pwd.value); + maj = gss_import_name(&min, &ba_user, GSS_C_NT_USER_NAME, &client); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "In Basic Auth, %s", + mag_error(req, "gss_import_name() failed", + maj, min)); + goto done; + } +#ifdef HAVE_GSS_KRB5_CCACHE_NAME + /* Set a per-thread ccache in case we are using kerberos, + * it is not elegant but avoids interference between threads */ + long long unsigned int rndname; + apr_status_t rs; + rs = apr_generate_random_bytes((unsigned char *)(&rndname), + sizeof(long long unsigned int)); + if (rs != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "Failed to generate random ccache name"); + goto done; + } + user_ccache = apr_psprintf(req->pool, "MEMORY:user_%qu", rndname); + maj = gss_krb5_ccache_name(&min, user_ccache, &orig_ccache); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "In Basic Auth, %s", + mag_error(req, "gss_krb5_ccache_name() " + "failed", maj, min)); + goto done; + } +#endif + maj = gss_acquire_cred_with_password(&min, client, &ba_pwd, + GSS_C_INDEFINITE, + GSS_C_NO_OID_SET, + GSS_C_INITIATE, + &user_cred, NULL, NULL); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "In Basic Auth, %s", + mag_error(req, "gss_acquire_cred_with_password() " + "failed", maj, min)); + goto done; + } + gss_release_name(&min, &client); + } else { + goto done; + } - 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); + req->ap_auth_type = apr_pstrdup(req->pool, auth_type); #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, + 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); @@ -268,6 +429,46 @@ static int mag_auth(request_rec *req) } #endif + 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|APLOG_NOERRNO, 0, req, + "%s", mag_error(req, "gss_acquire_cred_from()" + " failed", maj, min)); + goto done; + } + } + maj = gss_inquire_cred(&min, acquired_cred, &server, + NULL, NULL, NULL); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "%s", mag_error(req, "gss_inquired_cred_() " + "failed", maj, min)); + goto done; + } + + if (cfg->deleg_ccache_dir) { + /* delegate ourselves credentials so we store them as requested */ + init_flags |= GSS_C_DELEG_FLAG; + } + + /* output and input are inverted here, this is intentional */ + maj = gss_init_sec_context(&min, user_cred, &user_ctx, server, + GSS_C_NO_OID, init_flags, 300, + GSS_C_NO_CHANNEL_BINDINGS, &output, + NULL, &input, NULL, NULL); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "%s", mag_error(req, "gss_init_sec_context() " + "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, @@ -278,8 +479,33 @@ static int mag_auth(request_rec *req) maj, min)); goto done; } - - if (maj == GSS_S_CONTINUE_NEEDED) { + if (is_basic) { + while (maj == GSS_S_CONTINUE_NEEDED) { + gss_release_buffer(&min, &input); + /* output and input are inverted here, this is intentional */ + maj = gss_init_sec_context(&min, user_cred, &user_ctx, server, + GSS_C_NO_OID, init_flags, 300, + GSS_C_NO_CHANNEL_BINDINGS, &output, + NULL, &input, NULL, NULL); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "%s", mag_error(req, "gss_init_sec_context() " + "failed", maj, min)); + goto done; + } + gss_release_buffer(&min, &output); + maj = gss_accept_sec_context(&min, pctx, acquired_cred, + &input, GSS_C_NO_CHANNEL_BINDINGS, + &client, &mech_type, &output, &flags, + &vtime, &delegated_cred); + if (GSS_ERROR(maj)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "%s", mag_error(req, "gss_accept_sec_context()" + " failed", maj, min)); + goto done; + } + } + } else if (maj == GSS_S_CONTINUE_NEEDED) { if (!mc) { ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, "Mechanism needs continuation but neither " @@ -293,18 +519,19 @@ static int mag_auth(request_rec *req) goto done; } - 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, "%s", - mag_error(req, "gss_accept_sec_context() failed", + mag_error(req, "gss_display_name() failed", maj, min)); goto done; } clientname = apr_pstrndup(req->pool, name.value, name.length); apr_table_set(req->subprocess_env, "GSS_NAME", clientname); + expiration = time(NULL) + vtime; + apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION", + apr_psprintf(req->pool, "%ld", (long)expiration)); #ifdef HAVE_GSS_STORE_CRED_INTO if (cfg->deleg_ccache_dir && delegated_cred != GSS_C_NO_CREDENTIAL) { @@ -338,33 +565,53 @@ static int mag_auth(request_rec *req) if (vtime == GSS_C_INDEFINITE || vtime < MIN_SESS_EXP_TIME) { vtime = MIN_SESS_EXP_TIME; } - mc->expiration = time(NULL) + vtime; + mc->expiration = expiration; if (cfg->use_sessions) { mag_attempt_session(req, cfg, mc); } + mc->auth_type = auth_type; } ret = OK; done: - if (ret == HTTP_UNAUTHORIZED) { - if (output.length != 0) { - replen = apr_base64_encode_len(output.length) + 1; - reply = apr_pcalloc(req->pool, 10 + replen); - if (reply) { - memcpy(reply, "Negotiate ", 10); - apr_base64_encode(&reply[10], output.value, output.length); - apr_table_add(req->err_headers_out, - "WWW-Authenticate", reply); - } - } else { + if ((!is_basic) && (output.length != 0)) { + replen = apr_base64_encode_len(output.length) + 1; + reply = apr_pcalloc(req->pool, 10 + replen); + if (reply) { + memcpy(reply, "Negotiate ", 10); + apr_base64_encode(&reply[10], 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"); + if (cfg->use_basic_auth) { apr_table_add(req->err_headers_out, - "WWW-Authenticate", "Negotiate"); + "WWW-Authenticate", + apr_psprintf(req->pool, "Basic realm=\"%s\"", + ap_auth_name(req))); + } + } +#ifdef HAVE_GSS_KRB5_CCACHE_NAME + if (user_ccache != NULL) { + maj = gss_krb5_ccache_name(&min, orig_ccache, NULL); + if (maj != GSS_S_COMPLETE) { + ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req, + "Failed to restore per-thread ccache, %s", + mag_error(req, "gss_krb5_ccache_name() " + "failed", maj, min)); } } +#endif + gss_delete_sec_context(&min, &user_ctx, &output); + gss_release_cred(&min, &user_cred); + gss_release_cred(&min, &acquired_cred); gss_release_cred(&min, &delegated_cred); gss_release_buffer(&min, &output); gss_release_name(&min, &client); + gss_release_name(&min, &server); gss_release_buffer(&min, &name); gss_release_buffer(&min, &lname); return ret; @@ -541,6 +788,14 @@ static const char *mag_deleg_ccache_dir(cmd_parms *parms, void *mconfig, return NULL; } +static const char *mag_use_basic_auth(cmd_parms *parms, void *mconfig, int on) +{ + struct mag_config *cfg = (struct mag_config *)mconfig; + + cfg->use_basic_auth = on ? true : false; + 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"), @@ -562,6 +817,10 @@ static const command_rec mag_commands[] = { AP_INIT_RAW_ARGS("GssapiDelegCcacheDir", mag_deleg_ccache_dir, NULL, OR_AUTHCFG, "Directory to store delegated credentials"), #endif +#ifdef HAVE_GSS_ACQUIRE_CRED_WITH_PASSWORD + AP_INIT_FLAG("GssapiBasicAuth", mag_use_basic_auth, NULL, OR_AUTHCFG, + "Allows use of Basic Auth for authentication"), +#endif { NULL } };