/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "apr_strings.h" #include "apr_md5.h" /* for apr_password_validate */ #include "apr_lib.h" /* for apr_isspace */ #include "apr_base64.h" /* for apr_base64_decode et al */ #define APR_WANT_STRFUNC /* for strcasecmp */ #include "apr_want.h" #include "ap_config.h" #include "httpd.h" #include "http_config.h" #include "http_core.h" #include "http_log.h" #include "http_protocol.h" #include "http_request.h" #include "ap_provider.h" #include "mod_auth.h" typedef struct { authn_provider_list *providers; char *dir; int authoritative; } auth_basic_config_rec; static void *create_auth_basic_dir_config(apr_pool_t *p, char *d) { auth_basic_config_rec *conf = apr_pcalloc(p, sizeof(*conf)); conf->dir = d; /* Any failures are fatal. */ conf->authoritative = 1; return conf; } static const char *add_authn_provider(cmd_parms *cmd, void *config, const char *arg) { auth_basic_config_rec *conf = (auth_basic_config_rec*)config; authn_provider_list *newp; newp = apr_pcalloc(cmd->pool, sizeof(authn_provider_list)); newp->provider_name = apr_pstrdup(cmd->pool, arg); /* lookup and cache the actual provider now */ newp->provider = ap_lookup_provider(AUTHN_PROVIDER_GROUP, newp->provider_name, "0"); if (newp->provider == NULL) { /* by the time they use it, the provider should be loaded and registered with us. */ return apr_psprintf(cmd->pool, "Unknown Authn provider: %s", newp->provider_name); } if (!newp->provider->check_password) { /* if it doesn't provide the appropriate function, reject it */ return apr_psprintf(cmd->pool, "The '%s' Authn provider doesn't support " "Basic Authentication", newp->provider_name); } /* Add it to the list now. */ if (!conf->providers) { conf->providers = newp; } else { authn_provider_list *last = conf->providers; while (last->next) { last = last->next; } last->next = newp; } return NULL; } static const command_rec auth_basic_cmds[] = { AP_INIT_ITERATE("AuthBasicProvider", add_authn_provider, NULL, OR_AUTHCFG, "specify the auth providers for a directory or location"), AP_INIT_FLAG("AuthBasicAuthoritative", ap_set_flag_slot, (void *)APR_OFFSETOF(auth_basic_config_rec, authoritative), OR_AUTHCFG, "Set to 'Off' to allow access control to be passed along to " "lower modules if the UserID is not known to this module"), {NULL} }; module AP_MODULE_DECLARE_DATA auth_basic_module; /* These functions return 0 if client is OK, and proper error status * if not... either HTTP_UNAUTHORIZED, if we made a check, and it failed, or * HTTP_INTERNAL_SERVER_ERROR, if things are so totally confused that we * couldn't figure out how to tell if the client is authorized or not. * * If they return DECLINED, and all other modules also decline, that's * treated by the server core as a configuration error, logged and * reported as such. */ static void note_basic_auth_failure(request_rec *r) { apr_table_setn(r->err_headers_out, (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate" : "WWW-Authenticate", apr_pstrcat(r->pool, "Basic realm=\"", ap_auth_name(r), "\"", NULL)); } static int get_basic_auth(request_rec *r, const char **user, const char **pw) { const char *auth_line; char *decoded_line; int length; /* Get the appropriate header */ auth_line = apr_table_get(r->headers_in, (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authorization" : "Authorization"); if (!auth_line) { note_basic_auth_failure(r); return HTTP_UNAUTHORIZED; } if (strcasecmp(ap_getword(r->pool, &auth_line, ' '), "Basic")) { /* Client tried to authenticate using wrong auth scheme */ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "client used wrong authentication scheme: %s", r->uri); note_basic_auth_failure(r); return HTTP_UNAUTHORIZED; } /* Skip leading spaces. */ while (apr_isspace(*auth_line)) { auth_line++; } decoded_line = apr_palloc(r->pool, apr_base64_decode_len(auth_line) + 1); length = apr_base64_decode(decoded_line, auth_line); /* Null-terminate the string. */ decoded_line[length] = '\0'; *user = ap_getword_nulls(r->pool, (const char**)&decoded_line, ':'); *pw = decoded_line; /* set the user, even though the user is unauthenticated at this point */ r->user = (char *) *user; return OK; } /* Determine user ID, and check if it really is that user, for HTTP * basic authentication... */ static int authenticate_basic_user(request_rec *r) { auth_basic_config_rec *conf = ap_get_module_config(r->per_dir_config, &auth_basic_module); const char *sent_user, *sent_pw, *current_auth; int res; authn_status auth_result; authn_provider_list *current_provider; /* Are we configured to be Basic auth? */ current_auth = ap_auth_type(r); if (!current_auth || strcasecmp(current_auth, "Basic")) { return DECLINED; } /* We need an authentication realm. */ if (!ap_auth_name(r)) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "need AuthName: %s", r->uri); return HTTP_INTERNAL_SERVER_ERROR; } r->ap_auth_type = "Basic"; res = get_basic_auth(r, &sent_user, &sent_pw); if (res) { return res; } current_provider = conf->providers; do { const authn_provider *provider; /* For now, if a provider isn't set, we'll be nice and use the file * provider. */ if (!current_provider) { provider = ap_lookup_provider(AUTHN_PROVIDER_GROUP, AUTHN_DEFAULT_PROVIDER, "0"); if (!provider || !provider->check_password) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No Authn provider configured"); auth_result = AUTH_GENERAL_ERROR; break; } apr_table_setn(r->notes, AUTHN_PROVIDER_NAME_NOTE, AUTHN_DEFAULT_PROVIDER); } else { provider = current_provider->provider; apr_table_setn(r->notes, AUTHN_PROVIDER_NAME_NOTE, current_provider->provider_name); } auth_result = provider->check_password(r, sent_user, sent_pw); apr_table_unset(r->notes, AUTHN_PROVIDER_NAME_NOTE); /* Something occured. Stop checking. */ if (auth_result != AUTH_USER_NOT_FOUND) { break; } /* If we're not really configured for providers, stop now. */ if (!conf->providers) { break; } current_provider = current_provider->next; } while (current_provider); if (auth_result != AUTH_GRANTED) { int return_code; /* If we're not authoritative, then any error is ignored. */ if (!(conf->authoritative) && auth_result != AUTH_DENIED) { return DECLINED; } switch (auth_result) { case AUTH_DENIED: ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "user %s: authentication failure for \"%s\": " "Password Mismatch", sent_user, r->uri); return_code = HTTP_UNAUTHORIZED; break; case AUTH_USER_NOT_FOUND: ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "user %s not found: %s", sent_user, r->uri); return_code = HTTP_UNAUTHORIZED; break; case AUTH_GENERAL_ERROR: default: /* We'll assume that the module has already said what its error * was in the logs. */ return_code = HTTP_INTERNAL_SERVER_ERROR; break; } /* If we're returning 403, tell them to try again. */ if (return_code == HTTP_UNAUTHORIZED) { note_basic_auth_failure(r); } return return_code; } return OK; } static void register_hooks(apr_pool_t *p) { ap_hook_check_user_id(authenticate_basic_user,NULL,NULL,APR_HOOK_MIDDLE); } module AP_MODULE_DECLARE_DATA auth_basic_module = { STANDARD20_MODULE_STUFF, create_auth_basic_dir_config, /* dir config creater */ NULL, /* dir merger --- default is to override */ NULL, /* server config */ NULL, /* merge server config */ auth_basic_cmds, /* command apr_table_t */ register_hooks /* register hooks */ };
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