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Diffstat (limited to 'modules/aaa/mod_access_compat.c')
| -rw-r--r-- | modules/aaa/mod_access_compat.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/modules/aaa/mod_access_compat.c b/modules/aaa/mod_access_compat.c new file mode 100644 index 0000000..e9f1abe --- /dev/null +++ b/modules/aaa/mod_access_compat.c @@ -0,0 +1,377 @@ +/* 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. + */ + +/* + * Security options etc. + * + * Module derived from code originally written by Rob McCool + * + */ + +#include "apr_strings.h" +#include "apr_network_io.h" +#include "apr_md5.h" + +#define APR_WANT_STRFUNC +#define APR_WANT_BYTEFUNC +#include "apr_want.h" + +#include "ap_config.h" +#include "httpd.h" +#include "http_core.h" +#include "http_config.h" +#include "http_log.h" +#include "http_protocol.h" +#include "http_request.h" + +#include "mod_auth.h" + +#if APR_HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif + +enum allowdeny_type { + T_ENV, + T_NENV, + T_ALL, + T_IP, + T_HOST, + T_FAIL +}; + +typedef struct { + apr_int64_t limited; + union { + char *from; + apr_ipsubnet_t *ip; + } x; + enum allowdeny_type type; +} allowdeny; + +/* things in the 'order' array */ +#define DENY_THEN_ALLOW 0 +#define ALLOW_THEN_DENY 1 +#define MUTUAL_FAILURE 2 + +typedef struct { + int order[METHODS]; + apr_array_header_t *allows; + apr_array_header_t *denys; + int *satisfy; /* for every method one */ +} access_compat_dir_conf; + +module AP_MODULE_DECLARE_DATA access_compat_module; + +static void *create_access_compat_dir_config(apr_pool_t *p, char *dummy) +{ + int i; + access_compat_dir_conf *conf = + (access_compat_dir_conf *)apr_pcalloc(p, sizeof(access_compat_dir_conf)); + + for (i = 0; i < METHODS; ++i) { + conf->order[i] = DENY_THEN_ALLOW; + } + conf->allows = apr_array_make(p, 1, sizeof(allowdeny)); + conf->denys = apr_array_make(p, 1, sizeof(allowdeny)); + conf->satisfy = apr_palloc(p, sizeof(*conf->satisfy) * METHODS); + for (i = 0; i < METHODS; ++i) { + conf->satisfy[i] = SATISFY_NOSPEC; + } + + return (void *)conf; +} + +static const char *order(cmd_parms *cmd, void *dv, const char *arg) +{ + access_compat_dir_conf *d = (access_compat_dir_conf *) dv; + int i, o; + + if (!strcasecmp(arg, "allow,deny")) + o = ALLOW_THEN_DENY; + else if (!strcasecmp(arg, "deny,allow")) + o = DENY_THEN_ALLOW; + else if (!strcasecmp(arg, "mutual-failure")) + o = MUTUAL_FAILURE; + else + return "unknown order"; + + for (i = 0; i < METHODS; ++i) + if (cmd->limited & (AP_METHOD_BIT << i)) + d->order[i] = o; + + return NULL; +} + +static const char *satisfy(cmd_parms *cmd, void *dv, const char *arg) +{ + access_compat_dir_conf *d = (access_compat_dir_conf *) dv; + int satisfy = SATISFY_NOSPEC; + int i; + + if (!strcasecmp(arg, "all")) { + satisfy = SATISFY_ALL; + } + else if (!strcasecmp(arg, "any")) { + satisfy = SATISFY_ANY; + } + else { + return "Satisfy either 'any' or 'all'."; + } + + for (i = 0; i < METHODS; ++i) { + if (cmd->limited & (AP_METHOD_BIT << i)) { + d->satisfy[i] = satisfy; + } + } + + return NULL; +} + +static const char *allow_cmd(cmd_parms *cmd, void *dv, const char *from, + const char *where_c) +{ + access_compat_dir_conf *d = (access_compat_dir_conf *) dv; + allowdeny *a; + char *where = apr_pstrdup(cmd->pool, where_c); + char *s; + apr_status_t rv; + + if (strcasecmp(from, "from")) + return "allow and deny must be followed by 'from'"; + + a = (allowdeny *) apr_array_push(cmd->info ? d->allows : d->denys); + a->x.from = where; + a->limited = cmd->limited; + + if (!strncasecmp(where, "env=!", 5)) { + a->type = T_NENV; + a->x.from += 5; + + } + else if (!strncasecmp(where, "env=", 4)) { + a->type = T_ENV; + a->x.from += 4; + + } + else if (!strcasecmp(where, "all")) { + a->type = T_ALL; + } + else if ((s = ap_strchr(where, '/'))) { + *s++ = '\0'; + rv = apr_ipsubnet_create(&a->x.ip, where, s, cmd->pool); + if(APR_STATUS_IS_EINVAL(rv)) { + /* looked nothing like an IP address */ + return "An IP address was expected"; + } + else if (rv != APR_SUCCESS) { + return apr_psprintf(cmd->pool, "%pm", &rv); + } + a->type = T_IP; + } + else if (!APR_STATUS_IS_EINVAL(rv = apr_ipsubnet_create(&a->x.ip, where, + NULL, cmd->pool))) { + if (rv != APR_SUCCESS) + return apr_psprintf(cmd->pool, "%pm", &rv); + a->type = T_IP; + } + else if (ap_strchr(where, '#')) { + return "No comments are allowed here"; + } + else { /* no slash, didn't look like an IP address => must be a host */ + a->type = T_HOST; + } + + return NULL; +} + +static char its_an_allow; + +static const command_rec access_compat_cmds[] = +{ + AP_INIT_TAKE1("order", order, NULL, OR_LIMIT, + "'allow,deny', 'deny,allow', or 'mutual-failure'"), + AP_INIT_ITERATE2("allow", allow_cmd, &its_an_allow, OR_LIMIT, + "'from' followed by hostnames or IP-address wildcards"), + AP_INIT_ITERATE2("deny", allow_cmd, NULL, OR_LIMIT, + "'from' followed by hostnames or IP-address wildcards"), + AP_INIT_TAKE1("Satisfy", satisfy, NULL, OR_AUTHCFG, + "access policy if both allow and require used ('all' or 'any')"), + {NULL} +}; + +static int in_domain(const char *domain, const char *what) +{ + int dl = strlen(domain); + int wl = strlen(what); + + if ((wl - dl) >= 0) { + if (strcasecmp(domain, &what[wl - dl]) != 0) { + return 0; + } + + /* Make sure we matched an *entire* subdomain --- if the user + * said 'allow from good.com', we don't want people from nogood.com + * to be able to get in. + */ + + if (wl == dl) { + return 1; /* matched whole thing */ + } + else { + return (domain[0] == '.' || what[wl - dl - 1] == '.'); + } + } + else { + return 0; + } +} + +static int find_allowdeny(request_rec *r, apr_array_header_t *a, int method) +{ + + allowdeny *ap = (allowdeny *) a->elts; + apr_int64_t mmask = (AP_METHOD_BIT << method); + int i; + int gothost = 0; + const char *remotehost = NULL; + + for (i = 0; i < a->nelts; ++i) { + if (!(mmask & ap[i].limited)) { + continue; + } + + switch (ap[i].type) { + case T_ENV: + if (apr_table_get(r->subprocess_env, ap[i].x.from)) { + return 1; + } + break; + + case T_NENV: + if (!apr_table_get(r->subprocess_env, ap[i].x.from)) { + return 1; + } + break; + + case T_ALL: + return 1; + + case T_IP: + if (apr_ipsubnet_test(ap[i].x.ip, r->useragent_addr)) { + return 1; + } + break; + + case T_HOST: + if (!gothost) { + int remotehost_is_ip; + + remotehost = ap_get_useragent_host(r, REMOTE_DOUBLE_REV, + &remotehost_is_ip); + + if ((remotehost == NULL) || remotehost_is_ip) { + gothost = 1; + } + else { + gothost = 2; + } + } + + if ((gothost == 2) && in_domain(ap[i].x.from, remotehost)) { + return 1; + } + break; + + case T_FAIL: + /* do nothing? */ + break; + } + } + + return 0; +} + +static int access_compat_ap_satisfies(request_rec *r) +{ + access_compat_dir_conf *conf = (access_compat_dir_conf *) + ap_get_module_config(r->per_dir_config, &access_compat_module); + + return conf->satisfy[r->method_number]; +} + +static int check_dir_access(request_rec *r) +{ + int method = r->method_number; + int ret = OK; + access_compat_dir_conf *a = (access_compat_dir_conf *) + ap_get_module_config(r->per_dir_config, &access_compat_module); + + if (a->order[method] == ALLOW_THEN_DENY) { + ret = HTTP_FORBIDDEN; + if (find_allowdeny(r, a->allows, method)) { + ret = OK; + } + if (find_allowdeny(r, a->denys, method)) { + ret = HTTP_FORBIDDEN; + } + } + else if (a->order[method] == DENY_THEN_ALLOW) { + if (find_allowdeny(r, a->denys, method)) { + ret = HTTP_FORBIDDEN; + } + if (find_allowdeny(r, a->allows, method)) { + ret = OK; + } + } + else { + if (find_allowdeny(r, a->allows, method) + && !find_allowdeny(r, a->denys, method)) { + ret = OK; + } + else { + ret = HTTP_FORBIDDEN; + } + } + + if (ret == HTTP_FORBIDDEN) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01797) + "client denied by server configuration: %s%s", + r->filename ? "" : "uri ", + r->filename ? r->filename : r->uri); + } + + return ret; +} + +static void register_hooks(apr_pool_t *p) +{ + APR_REGISTER_OPTIONAL_FN(access_compat_ap_satisfies); + + /* This can be access checker since we don't require r->user to be set. */ + ap_hook_check_access(check_dir_access, NULL, NULL, APR_HOOK_MIDDLE, + AP_AUTH_INTERNAL_PER_CONF); +} + +AP_DECLARE_MODULE(access_compat) = +{ + STANDARD20_MODULE_STUFF, + create_access_compat_dir_config, /* dir config creater */ + NULL, /* dir merger --- default is to override */ + NULL, /* server config */ + NULL, /* merge server config */ + access_compat_cmds, + register_hooks /* register hooks */ +}; |