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-
- /* ====================================================================
- * Copyright (c) 1995 The Apache Group. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission.
- *
- * 5. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
-
- /*
- * mod_digest: MD5 digest authentication
- *
- * by Alexei Kosut <akosut@nueva.pvt.k12.ca.us>
- * based on mod_auth, by Rob McCool and Robert S. Thau
- *
- */
-
- #include "httpd.h"
- #include "http_config.h"
- #include "http_core.h"
- #include "http_log.h"
- #include "http_protocol.h"
- #include "util_md5.h"
-
- typedef struct digest_config_struct {
- char *pwfile;
- } digest_config_rec;
-
- typedef struct digest_header_struct {
- char *username;
- char *realm;
- char *nonce;
- char *requested_uri;
- char *digest;
- } digest_header_rec;
-
- void *create_digest_dir_config (pool *p, char *d)
- {
- return pcalloc (p, sizeof(digest_config_rec));
- }
-
- command_rec digest_cmds[] = {
- { "AuthDigestFile", set_string_slot,
- (void*)XtOffsetOf(digest_config_rec,pwfile), OR_AUTHCFG, TAKE1, NULL },
- { NULL }
- };
-
- module digest_module;
-
- char *get_hash(request_rec *r, char *user, char *auth_pwfile)
- {
- FILE *f;
- char l[MAX_STRING_LEN];
- char *rpw, *w, *x;
-
- if(!(f=pfopen(r->pool, auth_pwfile, "r"))) {
- log_reason ("Could not open password file", auth_pwfile, r);
- return NULL;
- }
- while(!(cfg_getline(l,MAX_STRING_LEN,f))) {
- if((l[0] == '#') || (!l[0])) continue;
- rpw = l;
- w = getword(r->pool, &rpw, ':');
- x = getword(r->pool, &rpw, ':');
-
- if(x && w && !strcmp(user,w) && !strcmp(auth_name(r), x)) {
- pfclose(r->pool, f);
- return pstrdup (r->pool, rpw);
- }
- }
- pfclose(r->pool, f);
- return NULL;
- }
-
- /* Parse the Authorization header, if it exists */
-
- int get_digest_rec(request_rec *r, digest_header_rec *response) {
- char *auth_line = table_get(r->headers_in, "Authorization");
- int l;
- int s = 0, vk = 0, vv = 0;
- char *t, *key, *value;
-
- if (!(t = auth_type(r)) || strcasecmp(t, "Digest"))
- return DECLINED;
-
- if (!auth_name (r)) {
- log_reason ("need AuthName", r->uri, r);
- return SERVER_ERROR;
- }
-
- if (!auth_line) {
- note_digest_auth_failure (r);
- return AUTH_REQUIRED;
- }
-
- if (strcmp(getword (r->pool, &auth_line, ' '), "Digest")) {
- /* Client tried to authenticate using wrong auth scheme */
- log_reason ("client used wrong authentication scheme", r->uri, r);
- note_digest_auth_failure (r);
- return AUTH_REQUIRED;
- }
-
- l = strlen(auth_line);
-
- key=palloc(r->pool,l);
- value=palloc(r->pool,l);
-
- /* There's probably a better way to do this, but for the time being... */
-
- #define D_KEY 0
- #define D_VALUE 1
- #define D_STRING 2
- #define D_EXIT -1
-
- while (s != D_EXIT) {
- switch (s) {
- case D_STRING:
- if (auth_line[0] == '\"') {
- s = D_VALUE;
- }
- else {
- value[vv] = auth_line[0];
- vv++;
- }
- auth_line++;
- break;
-
- case D_VALUE:
- if (isalnum(auth_line[0])) {
- value[vv] = auth_line[0];
- vv++;
- }
- else if (auth_line[0] == '\"') {
- s = D_STRING;
- }
- else {
- value[vv] = '\0';
-
- if (!strcasecmp(key, "username"))
- response->username = pstrdup(r->pool, value);
- else if (!strcasecmp(key, "realm"))
- response->realm = pstrdup(r->pool, value);
- else if (!strcasecmp(key, "nonce"))
- response->nonce = pstrdup(r->pool, value);
- else if (!strcasecmp(key, "uri"))
- response->requested_uri = pstrdup(r->pool, value);
- else if (!strcasecmp(key, "response"))
- response->digest = pstrdup(r->pool, value);
-
- vv = 0;
- s = D_KEY;
- }
- auth_line++;
- break;
-
- case D_KEY:
- if (isalnum(auth_line[0])) {
- key[vk] = auth_line[0];
- vk++;
- }
- else if (auth_line[0] == '=') {
- key[vk] = '\0';
- vk = 0;
- s = D_VALUE;
- }
- auth_line++;
- break;
- }
-
- if (auth_line[-1] == '\0')
- s = D_EXIT;
- }
-
- if (!response->username || !response->realm || !response->nonce ||
- !response->requested_uri || !response->digest) {
- note_digest_auth_failure (r);
- return AUTH_REQUIRED;
- }
-
- r->connection->user = response->username;
- r->connection->auth_type = "Digest";
-
- return OK;
- }
-
- /* The actual MD5 code... whee */
-
- char *find_digest(request_rec *r, digest_header_rec *h, char *a1) {
- return md5(r->pool,
- (unsigned char *)pstrcat(r->pool, a1, ":", h->nonce, ":",
- md5(r->pool,
- (unsigned char *)pstrcat(r->pool,r->method,":",
- h->requested_uri,NULL)),
- NULL));
- }
-
- /* These functions return 0 if client is OK, and proper error status
- * if not... either AUTH_REQUIRED, if we made a check, and it failed, or
- * 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.
- */
-
- /* Determine user ID, and check if it really is that user, for HTTP
- * basic authentication...
- */
-
- int authenticate_digest_user (request_rec *r)
- {
- digest_config_rec *sec =
- (digest_config_rec *)get_module_config (r->per_dir_config,
- &digest_module);
- digest_header_rec *response = pcalloc (r->pool, sizeof(digest_header_rec));
- conn_rec *c = r->connection;
- char *a1;
- char errstr[MAX_STRING_LEN];
- int res;
-
- if ((res = get_digest_rec (r, response))) return res;
-
- if(!sec->pwfile)
- return DECLINED;
-
- if (!(a1 = get_hash(r, c->user, sec->pwfile))) {
- sprintf(errstr,"user %s not found",c->user);
- log_reason (errstr, r->uri, r);
- note_digest_auth_failure (r);
- return AUTH_REQUIRED;
- }
- /* anyone know where the prototype for crypt is? */
- if(strcmp(response->digest, find_digest(r, response, a1))) {
- sprintf(errstr,"user %s: password mismatch",c->user);
- log_reason (errstr, r->uri, r);
- note_digest_auth_failure (r);
- return AUTH_REQUIRED;
- }
- return OK;
- }
-
- /* Checking ID */
-
- int digest_check_auth (request_rec *r) {
- char *user = r->connection->user;
- int m = r->method_number;
- int method_restricted = 0;
- register int x;
- char *t, *w;
- array_header *reqs_arr;
- require_line *reqs;
-
- if (!(t = auth_type(r)) || strcasecmp(t, "Digest"))
- return DECLINED;
-
- reqs_arr = requires (r);
- /* If there is no "requires" directive,
- * then any user will do.
- */
- if (!reqs_arr)
- return OK;
- reqs = (require_line *)reqs_arr->elts;
-
- for(x=0; x < reqs_arr->nelts; x++) {
-
- if (! (reqs[x].method_mask & (1 << m))) continue;
-
- method_restricted = 1;
-
- t = reqs[x].requirement;
- w = getword(r->pool, &t, ' ');
- if(!strcmp(w,"valid-user"))
- return OK;
- else if(!strcmp(w,"user")) {
- while(t[0]) {
- w = getword_conf (r->pool, &t);
- if(!strcmp(user,w))
- return OK;
- }
- }
- else
- return DECLINED;
- }
-
- if (!method_restricted)
- return OK;
-
- note_digest_auth_failure(r);
- return AUTH_REQUIRED;
- }
-
- module digest_module = {
- STANDARD_MODULE_STUFF,
- NULL, /* initializer */
- create_digest_dir_config, /* dir config creater */
- NULL, /* dir merger --- default is to override */
- NULL, /* server config */
- NULL, /* merge server config */
- digest_cmds, /* command table */
- NULL, /* handlers */
- NULL, /* filename translation */
- authenticate_digest_user, /* check_user_id */
- digest_check_auth, /* check auth */
- NULL, /* check access */
- NULL, /* type_checker */
- NULL, /* fixups */
- NULL /* logger */
- };
-
-
-