| /* 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 "httpd.h" |
| #include "http_core.h" |
| #include "http_config.h" |
| #include "http_log.h" |
| #include "http_request.h" |
| |
| enum allowdeny_type { |
| T_ENV, |
| T_ALL, |
| T_IP, |
| T_HOST, |
| T_FAIL |
| }; |
| |
| typedef struct { |
| int limited; |
| union { |
| char *from; |
| struct { |
| struct in_addr net; |
| struct in_addr mask; |
| } 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]; |
| array_header *allows; |
| array_header *denys; |
| } access_dir_conf; |
| |
| module MODULE_VAR_EXPORT access_module; |
| |
| static void *create_access_dir_config(pool *p, char *dummy) |
| { |
| access_dir_conf *conf = |
| (access_dir_conf *) ap_pcalloc(p, sizeof(access_dir_conf)); |
| int i; |
| |
| for (i = 0; i < METHODS; ++i) |
| conf->order[i] = DENY_THEN_ALLOW; |
| conf->allows = ap_make_array(p, 1, sizeof(allowdeny)); |
| conf->denys = ap_make_array(p, 1, sizeof(allowdeny)); |
| |
| return (void *) conf; |
| } |
| |
| static const char *order(cmd_parms *cmd, void *dv, char *arg) |
| { |
| access_dir_conf *d = (access_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 & (1 << i)) |
| d->order[i] = o; |
| |
| return NULL; |
| } |
| |
| static int is_ip(const char *host) |
| { |
| while ((*host == '.') || ap_isdigit(*host)) |
| host++; |
| return (*host == '\0'); |
| } |
| |
| static const char *allow_cmd(cmd_parms *cmd, void *dv, char *from, char *where) |
| { |
| access_dir_conf *d = (access_dir_conf *) dv; |
| allowdeny *a; |
| char *s; |
| |
| if (strcasecmp(from, "from")) |
| return "allow and deny must be followed by 'from'"; |
| |
| a = (allowdeny *) ap_push_array(cmd->info ? d->allows : d->denys); |
| a->x.from = where; |
| a->limited = cmd->limited; |
| |
| 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 = strchr(where, '/'))) { |
| struct in_addr mask; |
| |
| a->type = T_IP; |
| /* trample on where, we won't be using it any more */ |
| *s++ = '\0'; |
| |
| if (!is_ip(where) |
| || (a->x.ip.net.s_addr = ap_inet_addr(where)) == INADDR_NONE) { |
| a->type = T_FAIL; |
| return "syntax error in network portion of network/netmask"; |
| } |
| |
| /* is_ip just tests if it matches [\d.]+ */ |
| if (!is_ip(s)) { |
| a->type = T_FAIL; |
| return "syntax error in mask portion of network/netmask"; |
| } |
| /* is it in /a.b.c.d form? */ |
| if (strchr(s, '.')) { |
| mask.s_addr = ap_inet_addr(s); |
| if (mask.s_addr == INADDR_NONE) { |
| a->type = T_FAIL; |
| return "syntax error in mask portion of network/netmask"; |
| } |
| } |
| else { |
| int i; |
| |
| /* assume it's in /nnn form */ |
| i = atoi(s); |
| if (i > 32 || i <= 0) { |
| a->type = T_FAIL; |
| return "invalid mask in network/netmask"; |
| } |
| mask.s_addr = 0xFFFFFFFFUL << (32 - i); |
| mask.s_addr = htonl(mask.s_addr); |
| } |
| a->x.ip.mask = mask; |
| a->x.ip.net.s_addr = (a->x.ip.net.s_addr & mask.s_addr); /* pjr - This fixes PR 4770 */ |
| } |
| else if (ap_isdigit(*where) && is_ip(where)) { |
| /* legacy syntax for ip addrs: a.b.c. ==> a.b.c.0/24 for example */ |
| int shift; |
| char *t; |
| int octet; |
| |
| a->type = T_IP; |
| /* parse components */ |
| s = where; |
| a->x.ip.net.s_addr = 0; |
| a->x.ip.mask.s_addr = 0; |
| shift = 24; |
| while (*s) { |
| t = s; |
| if (!ap_isdigit(*t)) { |
| a->type = T_FAIL; |
| return "invalid ip address"; |
| } |
| while (ap_isdigit(*t)) { |
| ++t; |
| } |
| if (*t == '.') { |
| *t++ = 0; |
| } |
| else if (*t) { |
| a->type = T_FAIL; |
| return "invalid ip address"; |
| } |
| if (shift < 0) { |
| a->type = T_FAIL; |
| return "invalid ip address, only 4 octets allowed"; |
| } |
| octet = atoi(s); |
| if (octet < 0 || octet > 255) { |
| a->type = T_FAIL; |
| return "each octet must be between 0 and 255 inclusive"; |
| } |
| a->x.ip.net.s_addr |= (unsigned int)octet << shift; |
| a->x.ip.mask.s_addr |= 0xFFUL << shift; |
| s = t; |
| shift -= 8; |
| } |
| a->x.ip.net.s_addr = ntohl(a->x.ip.net.s_addr); |
| a->x.ip.mask.s_addr = ntohl(a->x.ip.mask.s_addr); |
| } |
| else { |
| a->type = T_HOST; |
| } |
| |
| return NULL; |
| } |
| |
| static char its_an_allow; |
| |
| static const command_rec access_cmds[] = |
| { |
| {"order", order, NULL, OR_LIMIT, TAKE1, |
| "'allow,deny', 'deny,allow', or 'mutual-failure'"}, |
| {"allow", allow_cmd, &its_an_allow, OR_LIMIT, ITERATE2, |
| "'from' followed by hostnames or IP-address wildcards"}, |
| {"deny", allow_cmd, NULL, OR_LIMIT, ITERATE2, |
| "'from' followed by hostnames or IP-address wildcards"}, |
| {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, array_header *a, int method) |
| { |
| allowdeny *ap = (allowdeny *) a->elts; |
| int mmask = (1 << 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 (ap_table_get(r->subprocess_env, ap[i].x.from)) { |
| return 1; |
| } |
| break; |
| |
| case T_ALL: |
| return 1; |
| |
| case T_IP: |
| if (ap[i].x.ip.net.s_addr != INADDR_NONE |
| && (r->connection->remote_addr.sin_addr.s_addr |
| & ap[i].x.ip.mask.s_addr) == ap[i].x.ip.net.s_addr) { |
| return 1; |
| } |
| break; |
| |
| case T_HOST: |
| if (!gothost) { |
| remotehost = ap_get_remote_host(r->connection, r->per_dir_config, |
| REMOTE_DOUBLE_REV); |
| |
| if ((remotehost == NULL) || is_ip(remotehost)) |
| 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 check_dir_access(request_rec *r) |
| { |
| int method = r->method_number; |
| access_dir_conf *a = |
| (access_dir_conf *) |
| ap_get_module_config(r->per_dir_config, &access_module); |
| int ret = OK; |
| |
| if (a->order[method] == ALLOW_THEN_DENY) { |
| ret = FORBIDDEN; |
| if (find_allowdeny(r, a->allows, method)) |
| ret = OK; |
| if (find_allowdeny(r, a->denys, method)) |
| ret = FORBIDDEN; |
| } |
| else if (a->order[method] == DENY_THEN_ALLOW) { |
| if (find_allowdeny(r, a->denys, method)) |
| ret = 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 = FORBIDDEN; |
| } |
| |
| if (ret == FORBIDDEN |
| && (ap_satisfies(r) != SATISFY_ANY || !ap_some_auth_required(r))) { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r, |
| "client denied by server configuration: %s", |
| r->filename); |
| } |
| |
| return ret; |
| } |
| |
| |
| |
| module MODULE_VAR_EXPORT access_module = |
| { |
| STANDARD_MODULE_STUFF, |
| NULL, /* initializer */ |
| create_access_dir_config, /* dir config creater */ |
| NULL, /* dir merger --- default is to override */ |
| NULL, /* server config */ |
| NULL, /* merge server config */ |
| access_cmds, |
| NULL, /* handlers */ |
| NULL, /* filename translation */ |
| NULL, /* check_user_id */ |
| NULL, /* check auth */ |
| check_dir_access, /* check access */ |
| NULL, /* type_checker */ |
| NULL, /* fixups */ |
| NULL, /* logger */ |
| NULL, /* header parser */ |
| NULL, /* child_init */ |
| NULL, /* child_exit */ |
| NULL /* post read-request */ |
| }; |