/* ====================================================================
* Copyright (c) 1995-1999 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. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. 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 .
*
*/
/*
* mod_auth_digest: MD5 digest authentication
*
* Originally by Alexei Kosut
* Updated to RFC-2617 by Ronald Tschalär
* based on mod_auth, by Rob McCool and Robert S. Thau
*
* This module an updated version of modules/standard/mod_digest.c
* However, it has not been extensively tested yet, and is therefore
* currently marked experimental. Send problem reports to me
* (ronald@innovation.ch)
*
* Requires either /dev/random (or equivalent) or the truerand library,
* available for instance from
* ftp://research.att.com/dist/mab/librand.shar
*
* Open Issues:
* - qop=auth-int (when streams and trailer support available)
* - nonce-format configurability
* - Proxy-Authorization-Info header is set by this module, but is
* currently ignored by mod_proxy (needs patch to mod_proxy)
* - generating the secret takes a while (~ 8 seconds) if using the
* truerand library
* - shared-mem not completely tested yet. Seems to work ok for me,
* but... (definitely won't work on Windoze)
*/
/* The section for the Configure script:
* MODULE-DEFINITION-START
* Name: digest_auth_module
* ConfigStart
RULE_DEV_RANDOM=`./helpers/CutRule DEV_RANDOM $file`
if [ "$RULE_DEV_RANDOM" = "default" ]; then
if [ -r "/dev/random" ]; then
RULE_DEV_RANDOM="/dev/random"
elif [ -r "/dev/urandom" ]; then
RULE_DEV_RANDOM="/dev/urandom"
else
RULE_DEV_RANDOM="truerand"
if helpers/TestCompile func randbyte; then
:
elif helpers/TestCompile lib rand randbyte; then
:
else
echo " (mod_auth_digest) truerand library missing!"
echo "** This will most probably defeat successful compilation."
echo "** See Rule DEV_RANDOM in src/Configuration.tmpl for more information."
fi
fi
fi
if [ "$RULE_DEV_RANDOM" = "truerand" ]; then
echo " using truerand library (-lrand) for the random seed"
LIBS="$LIBS -L/usr/local/lib -lrand"
else
echo " using $RULE_DEV_RANDOM for the random seed"
CFLAGS="$CFLAGS -DDEV_RANDOM=$RULE_DEV_RANDOM"
fi
* ConfigEnd
* MODULE-DEFINITION-END
*/
#include "httpd.h"
#include "http_config.h"
#include "http_conf_globals.h"
#include "http_core.h"
#include "http_request.h"
#include "http_log.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "ap_ctype.h"
#include "util_uri.h"
#include "util_md5.h"
#include "ap_sha1.h"
#ifdef HAVE_SHMEM_MM
#include "mm.h"
#endif /* HAVE_SHMEM_MM */
/* struct to hold the configuration info */
typedef struct digest_config_struct {
const char *dir_name;
const char *pwfile;
const char *grpfile;
const char *realm;
const char **qop_list;
AP_SHA1_CTX nonce_ctx;
long nonce_lifetime;
const char *nonce_format;
int check_nc;
const char *algorithm;
char *uri_list;
const char *ha1;
} digest_config_rec;
#define DFLT_ALGORITHM "MD5"
#define DFLT_NONCE_LIFE 300L
#define NEXTNONCE_DELTA 30
#define NONCE_TIME_LEN (((sizeof(time_t)+2)/3)*4)
#define NONCE_HASH_LEN 40
#define NONCE_LEN (NONCE_TIME_LEN + NONCE_HASH_LEN)
#define SECRET_LEN 20
/* client list definitions */
typedef struct hash_entry {
unsigned long key; /* the key for this entry */
struct hash_entry *next; /* next entry in the bucket */
unsigned long nonce_count; /* for nonce-count checking */
char ha1[17]; /* for algorithm=MD5-sess */
char last_nonce[NONCE_LEN+1]; /* for one-time nonce's */
} client_entry;
static struct hash_table {
client_entry **table;
unsigned long tbl_len;
unsigned long num_entries;
unsigned long num_created;
unsigned long num_removed;
unsigned long num_renewed;
} *client_list;
/* struct to hold a parsed Authorization header */
enum hdr_sts { NO_HEADER, NOT_DIGEST, INVALID, VALID };
typedef struct digest_header_struct {
const char *scheme;
const char *realm;
const char *username;
char *nonce;
const char *uri;
const char *digest;
const char *algorithm;
const char *cnonce;
const char *opaque;
unsigned long opaque_num;
const char *message_qop;
const char *nonce_count;
/* the following fields are not (directly) from the header */
time_t nonce_time;
enum hdr_sts auth_hdr_sts;
uri_components *request_uri;
int needed_auth;
client_entry *client;
} digest_header_rec;
/* (mostly) nonce stuff */
typedef union time_union {
time_t time;
unsigned char arr[sizeof(time_t)];
} time_rec;
static unsigned char secret[SECRET_LEN];
static int call_cnt = 0;
#ifdef HAVE_SHMEM_MM
/* opaque stuff */
static MM *opaque_mm;
static unsigned long *opaque_cntr;
static MM *client_mm;
static MM *otn_count_mm;
static time_t *otn_counter; /* one-time-nonce counter */
#define SHMEM_SIZE 1000 /* ~ 12 entries */
#define NUM_BUCKETS 15UL
#else /* HAVE_SHMEM_MM */
static void *client_mm = NULL;
#endif /* HAVE_SHMEM_MM */
module MODULE_VAR_EXPORT digest_auth_module;
/*
* initialization code
*/
#ifdef HAVE_SHMEM_MM
static void cleanup_tables(void *not_used)
{
fprintf(stderr, "Digest: cleaning up shared memory\n");
fflush(stderr);
if (client_mm) {
mm_destroy(client_mm);
client_mm = NULL;
}
if (opaque_mm) {
mm_destroy(opaque_mm);
opaque_mm = NULL;
}
if (otn_count_mm) {
mm_destroy(otn_count_mm);
otn_count_mm = NULL;
}
}
#endif /* HAVE_SHMEM_MM */
static void initialize_secret(server_rec *s)
{
#ifdef DEV_RANDOM
FILE *rnd;
size_t got, tot;
#else
extern int randbyte(void); /* from the truerand library */
unsigned int idx;
#endif
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, s,
"Digest: generating secret for digest authentication ...");
#ifdef DEV_RANDOM
#define XSTR(x) #x
#define STR(x) XSTR(x)
if ((rnd = fopen(STR(DEV_RANDOM), "rb")) == NULL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, s,
"Digest: Couldn't open " STR(DEV_RANDOM));
exit(EXIT_FAILURE);
}
if (setvbuf(rnd, NULL, _IONBF, 0) != 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_CRIT, s,
"Digest: Error trying to disable buffering for " STR(DEV_RANDOM));
exit(EXIT_FAILURE);
}
for (tot=0; tottable = (client_entry**) (client_list + 1);
for (idx=0; idxtable[idx] = NULL;
client_list->tbl_len = NUM_BUCKETS;
client_list->num_entries = 0;
/* setup opaque */
opaque_mm = mm_create(sizeof(*opaque_cntr), tmpnam(NULL));
if (opaque_mm == NULL)
goto failed;
#ifdef MPE
if (geteuid() == 1) {
#else
if (geteuid() == 0) {
#endif
if (mm_permission(opaque_mm, 0600, ap_user_id, ap_group_id))
goto failed;
}
opaque_cntr = mm_malloc(opaque_mm, sizeof(*opaque_cntr));
if (opaque_cntr == NULL)
goto failed;
*opaque_cntr = 1UL;
/* setup one-time-nonce counter */
otn_count_mm = mm_create(sizeof(*otn_counter), tmpnam(NULL));
if (otn_count_mm == NULL)
goto failed;
#ifdef MPE
if (geteuid() == 1) {
#else
if (geteuid() == 0) {
#endif
if (mm_permission(otn_count_mm, 0600, ap_user_id, ap_group_id))
goto failed;
}
otn_counter = mm_malloc(otn_count_mm, sizeof(*otn_counter));
if (otn_counter == NULL)
goto failed;
*otn_counter = 0;
/* success */
return;
failed:
if (!client_mm || (client_list && client_list->table && !opaque_mm)
|| (opaque_cntr && !otn_count_mm))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, s,
"Digest: failed to create shared memory segments; reason "
"was `%s' - all nonce-count checking, one-time nonces, "
"and MD5-sess algorithm disabled", mm_error());
else
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, s,
"Digest: failed to allocate shared mem; reason was `%s' "
"- all nonce-count checking, one-time nonces, and "
"MD5-sess algorithm disabled", mm_error());
cleanup_tables(NULL);
}
#endif /* HAVE_SHMEM_MM */
static void initialize_module(server_rec *s, pool *p)
{
/* keep from doing the init more than once at startup, and delay
* the init until the second round
*/
if (++call_cnt < 2)
return;
/* only initialize the secret on startup, not on restarts */
if (call_cnt == 2)
initialize_secret(s);
#ifdef HAVE_SHMEM_MM
/* Note: this stuff is currently fixed for the lifetime of the server,
* i.e. even across restarts. This means that A) any shmem-size
* configuration changes are ignored, and B) certain optimizations,
* such as only allocating the smallest necessary entry for each
* client, can't be done. However, the alternative is a nightmare:
* we can't call mm_destroy on a graceful restart because there will
* be children using the tables, and we also don't know when the
* last child dies. Therefore we can never clean up the old stuff,
* creating a creeping memory leak.
*/
initialize_tables(s);
/* atexit(cleanup_tables); */
ap_register_cleanup(p, NULL, cleanup_tables, ap_null_cleanup);
#endif /* HAVE_SHMEM_MM */
}
/*
* configuration code
*/
static void *create_digest_dir_config(pool *p, char *dir)
{
digest_config_rec *conf;
if (dir == NULL) return NULL;
conf = (digest_config_rec *) ap_pcalloc(p, sizeof(digest_config_rec));
if (conf) {
conf->qop_list = ap_palloc(p, sizeof(char*));
conf->qop_list[0] = NULL;
conf->nonce_lifetime = DFLT_NONCE_LIFE;
conf->dir_name = ap_pstrdup(p, dir);
conf->algorithm = DFLT_ALGORITHM;
}
return conf;
}
static const char *set_realm(cmd_parms *cmd, void *config, const char *realm)
{
digest_config_rec *conf = (digest_config_rec *) config;
/* The core already handles the realm, but it's just too convenient to
* grab it ourselves too and cache some setups. However, we need to
* let the core get at it too, which is why we decline at the end -
* this relies on the fact that http_core is last in the list.
*/
conf->realm = realm;
/* we precompute the part of the nonce hash that is constant (well,
* the host:port would be too, but that varies for .htaccess files
* and directives outside a virtual host section)
*/
ap_SHA1Init(&conf->nonce_ctx);
ap_SHA1Update_binary(&conf->nonce_ctx, (const unsigned char *) realm,
strlen(realm));
ap_SHA1Update_binary(&conf->nonce_ctx, secret, sizeof(secret));
return DECLINE_CMD;
}
static const char *set_digest_file(cmd_parms *cmd, void *config,
const char *file)
{
((digest_config_rec *) config)->pwfile = file;
return NULL;
}
static const char *set_group_file(cmd_parms *cmd, void *config,
const char *file)
{
((digest_config_rec *) config)->grpfile = file;
return NULL;
}
static const char *set_qop(cmd_parms *cmd, void *config, const char *op)
{
digest_config_rec *conf = (digest_config_rec *) config;
const char **tmp;
int cnt;
if (!strcasecmp(op, "none")) {
if (conf->qop_list[0] == NULL) {
conf->qop_list = ap_palloc(cmd->pool, 2 * sizeof(char*));
conf->qop_list[1] = NULL;
}
conf->qop_list[0] = "none";
return NULL;
}
if (!strcasecmp(op, "auth-int"))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, cmd->server,
"Digest: WARNING: qop `auth-int' currently only works "
"correctly for responses with no entity");
else if (strcasecmp(op, "auth"))
return ap_pstrcat(cmd->pool, "Unrecognized qop: ", op, NULL);
for (cnt=0; conf->qop_list[cnt] != NULL; cnt++)
;
tmp = ap_palloc(cmd->pool, (cnt+2)*sizeof(char*));
memcpy(tmp, conf->qop_list, cnt*sizeof(char*));
tmp[cnt] = ap_pstrdup(cmd->pool, op);
tmp[cnt+1] = NULL;
conf->qop_list = tmp;
return NULL;
}
static const char *set_nonce_lifetime(cmd_parms *cmd, void *config,
const char *t)
{
char *endptr;
long lifetime;
lifetime = strtol(t, &endptr, 10);
if (endptr < (t+strlen(t)) && !ap_isspace(*endptr))
return ap_pstrcat(cmd->pool, "Invalid time in AuthDigestNonceLifetime: ", t, NULL);
((digest_config_rec *) config)->nonce_lifetime = lifetime;
return NULL;
}
static const char *set_nonce_format(cmd_parms *cmd, void *config,
const char *fmt)
{
((digest_config_rec *) config)->nonce_format = fmt;
return "AuthDigestNonceFormat is not implemented (yet)";
}
static const char *set_nc_check(cmd_parms *cmd, void *config, int flag)
{
((digest_config_rec *) config)->check_nc = flag;
return NULL;
}
static const char *set_algorithm(cmd_parms *cmd, void *config, const char *alg)
{
if (!strcasecmp(alg, "MD5-sess"))
#ifdef HAVE_SHMEM_MM
;
#else /* HAVE_SHMEM_MM */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, cmd->server,
"Digest: WARNING: algorithm `MD5-sess' is currently not "
"correctly implemented");
#endif /* HAVE_SHMEM_MM */
else if (strcasecmp(alg, "MD5"))
return ap_pstrcat(cmd->pool, "Invalid algorithm in AuthDigestAlgorithm: ", alg, NULL);
((digest_config_rec *) config)->algorithm = alg;
return NULL;
}
static const char *set_uri_list(cmd_parms *cmd, void *config, const char *uri)
{
digest_config_rec *c = (digest_config_rec *) config;
if (c->uri_list) {
c->uri_list[strlen(c->uri_list)-1] = '\0';
c->uri_list = ap_pstrcat(cmd->pool, c->uri_list, " ", uri, "\"", NULL);
}
else
c->uri_list = ap_pstrcat(cmd->pool, ", domain=\"", uri, "\"", NULL);
return NULL;
}
static const command_rec digest_cmds[] =
{
{"AuthName", set_realm, NULL, OR_AUTHCFG, TAKE1,
"The authentication realm (e.g. \"Members Only\")"},
{"AuthDigestFile", set_digest_file, NULL, OR_AUTHCFG, TAKE1,
"The name of the file containing the usernames and password hashes"},
{"AuthDigestGroupFile", set_group_file, NULL, OR_AUTHCFG, TAKE1,
"The name of the file containing the group names and members"},
{"AuthDigestQop", set_qop, NULL, OR_AUTHCFG, ITERATE,
"A list of quality-of-protection options"},
{"AuthDigestNonceLifetime", set_nonce_lifetime, NULL, OR_AUTHCFG, TAKE1,
"Maximum lifetime of the server nonce (seconds)"},
{"AuthDigestNonceFormat", set_nonce_format, NULL, OR_AUTHCFG, TAKE1,
"The format to use when generating the server nonce"},
{"AuthDigestNcCheck", set_nc_check, NULL, OR_AUTHCFG, FLAG,
"Whether or not to check the nonce-count sent by the client"},
{"AuthDigestAlgorithm", set_algorithm, NULL, OR_AUTHCFG, TAKE1,
"The algorithm used for the hash calculation"},
{"AuthDigestDomain", set_uri_list, NULL, OR_AUTHCFG, ITERATE,
"A list of URI's which belong to the same protection space as the current URI"},
{NULL}
};
#ifdef HAVE_SHMEM_MM
/*
* client list code
*
* Each client is assigned a number, which is transfered in the opaque
* field of the WWW-Authenticate and Authorization headers. The number
* is just a simple counter which is incremented for each new client.
* Clients can't forge this number because it is hashed up into the
* server nonce, and that is checked.
*
* The clients are kept in a simple hash table, which consists of an
* array of client_entry's, each with a linked list of entries hanging
* off it. The client's number modulo the size of the array gives the
* bucket number.
*
* The clients are garbage collected whenever a new client is allocated
* but there is not enough space left in the shared memory segment. A
* simple semi-LRU is used for this: whenever a client entry is accessed
* it is moved to the beginning of the linked list in its bucket (this
* also makes for faster lookups for current clients). The garbage
* collecter then just removes the oldest entry (i.e. the one at the
* end of the list) in each bucket.
*
* The main advantages of the above scheme are that it's easy to implement
* and it keeps the hash table evenly balanced (i.e. same number of entries
* in each bucket). The major disadvantage is that you may be throwing
* entries out which are in active use. This is not tragic, as these
* clients will just be sent a new client id (opaque field) and nonce
* with a stale=true (i.e. it will just look like the nonce expired,
* thereby forcing an extra round trip). If the shared memory segment
* has enough headroom over the current client set size then this should
* not occur too often.
*
* To help tune the size of the shared memory segment (and see if the
* above algorithm is really sufficient) a set of counters is kept
* indicating the number of clients held, the number of garbage collected
* clients, and the number of erroneously purged clients. These are printed
* out at each garbage collection run. Note that access to the counters is
* not synchronized because they are just indicaters, and whether they are
* off by a few doesn't matter; and for the same reason no attempt is made
* to guarantee the num_renewed is correct in the face of clients spoofing
* the opaque field.
*/
/*
* Get the client given its client number (the key). Returns the entry,
* or NULL if its not found.
*
* Access to the list itself is synchronized via locks. However, access
* to the entry returned by get_client() is NOT synchronized. This means
* that there are potentially problems if a client uses multiple,
* simultaneous connections to access url's within the same protection
* space. However, these problems are not new: when using multiple
* connections you have no guarantee of the order the requests are
* processed anyway, so you have problems with the nonce-count and
* one-time nonces anyway.
*/
static client_entry *get_client(unsigned long key, const request_rec *r)
{
int bucket;
client_entry *entry, *prev = NULL;
if (!key || !client_mm) return NULL;
bucket = key % client_list->tbl_len;
entry = client_list->table[bucket];
mm_lock(client_mm, MM_LOCK_RD);
while(entry && key != entry->key) {
prev = entry;
entry = entry->next;
}
if (entry && prev) { /* move entry to front of list */
prev->next = entry->next;
entry->next = client_list->table[bucket];
client_list->table[bucket] = entry;
}
mm_unlock(client_mm);
if (entry)
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r,
"get_client(): client %lu found", key);
else
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r,
"get_client(): client %lu not found", key);
return entry;
}
/* A simple garbage-collecter to remove unused clients. It removes the
* last entry in each bucket and updates the counters. Returns the
* number of removed entries.
*/
static long gc(void)
{
client_entry *entry, *prev;
unsigned long num_removed = 0, idx;
/* garbage collect all last entries */
for (idx=0; idxtbl_len; idx++) {
entry = client_list->table[idx];
prev = NULL;
while (entry->next) { /* find last entry */
prev = entry;
entry = entry->next;
}
if (prev) prev->next = NULL; /* cut list */
else client_list->table[idx] = NULL;
if (entry) { /* remove entry */
mm_free(client_mm, entry);
num_removed++;
}
}
/* update counters and log */
client_list->num_entries -= num_removed;
client_list->num_removed += num_removed;
return num_removed;
}
/*
* Add a new client to the list. Returns the entry if successful, NULL
* otherwise. This triggers the garbage collection is memory is low.
*/
static client_entry *add_client(unsigned long key, client_entry *new,
server_rec *s)
{
int bucket;
client_entry *entry;
if (!key || !client_mm) return NULL;
bucket = key % client_list->tbl_len;
entry = client_list->table[bucket];
mm_lock(client_mm, MM_LOCK_RW);
/* try to allocate a new entry */
entry = mm_malloc(client_mm, sizeof(client_entry));
if (!entry) {
long num_removed = gc();
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, s,
"Digest: gc'd %ld client entries. Total new clients: "
"%ld; Total removed clients: %ld; Total renewed clients: "
"%ld", num_removed,
client_list->num_created - client_list->num_renewed,
client_list->num_removed, client_list->num_renewed);
entry = mm_malloc(client_mm, sizeof(client_entry));
if (!entry) return NULL; /* give up */
}
/* now add the entry */
memcpy(entry, new, sizeof(client_entry));
entry->key = key;
entry->next = client_list->table[bucket];
client_list->table[bucket] = entry;
client_list->num_created++;
client_list->num_entries++;
mm_unlock(client_mm);
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, s,
"allocated new client %lu", key);
return entry;
}
#else /* HAVE_SHMEM_MM */
static client_entry *get_client(unsigned long key, const request_rec *r)
{
return NULL;
}
#endif /* HAVE_SHMEM_MM */
/*
* Authorization header parser code
*/
/* Parse the Authorization header, if it exists */
static int get_digest_rec(request_rec *r, digest_header_rec *resp)
{
const char *auth_line = ap_table_get(r->headers_in,
r->proxyreq ? "Proxy-Authorization"
: "Authorization");
size_t l;
int vk = 0, vv = 0;
char *key, *value;
if (!auth_line) {
resp->auth_hdr_sts = NO_HEADER;
return !OK;
}
resp->scheme = ap_getword_white(r->pool, &auth_line);
if (strcasecmp(resp->scheme, "Digest")) {
resp->auth_hdr_sts = NOT_DIGEST;
return !OK;
}
l = strlen(auth_line);
key = ap_palloc(r->pool, l+1);
value = ap_palloc(r->pool, l+1);
while (auth_line[0] != '\0') {
/* find key */
while (ap_isspace(auth_line[0])) auth_line++;
vk = 0;
while (auth_line[0] != '=' && auth_line[0] != ','
&& auth_line[0] != '\0' && !ap_isspace(auth_line[0]))
key[vk++] = *auth_line++;
key[vk] = '\0';
while (ap_isspace(auth_line[0])) auth_line++;
/* find value */
if (auth_line[0] == '=') {
auth_line++;
while (ap_isspace(auth_line[0])) auth_line++;
vv = 0;
if (auth_line[0] == '\"') { /* quoted string */
auth_line++;
while (auth_line[0] != '\"' && auth_line[0] != '\0') {
if (auth_line[0] == '\\' && auth_line[1] != '\0')
auth_line++; /* escaped char */
value[vv++] = *auth_line++;
}
if (auth_line[0] != '\0') auth_line++;
}
else { /* token */
while (auth_line[0] != ',' && auth_line[0] != '\0'
&& !ap_isspace(auth_line[0]))
value[vv++] = *auth_line++;
}
value[vv] = '\0';
}
while (auth_line[0] != ',' && auth_line[0] != '\0') auth_line++;
if (auth_line[0] != '\0') auth_line++;
if (!strcasecmp(key, "username"))
resp->username = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "realm"))
resp->realm = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "nonce"))
resp->nonce = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "uri"))
resp->uri = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "response"))
resp->digest = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "algorithm"))
resp->algorithm = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "cnonce"))
resp->cnonce = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "opaque"))
resp->opaque = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "qop"))
resp->message_qop = ap_pstrdup(r->pool, value);
else if (!strcasecmp(key, "nc"))
resp->nonce_count = ap_pstrdup(r->pool, value);
}
if (!resp->username || !resp->realm || !resp->nonce || !resp->uri
|| !resp->digest) {
resp->auth_hdr_sts = INVALID;
return !OK;
}
if (resp->opaque)
resp->opaque_num = (unsigned long) strtol(resp->opaque, NULL, 16);
resp->auth_hdr_sts = VALID;
return OK;
}
/* Because the browser may preemptively send auth info, incrementing the
* nonce-count when it does, and because the client does not get notified
* if the URI didn't need authentication after all, we need to be sure to
* update the nonce-count each time we receive an Authorization header no
* matter what the final outcome of the request. Furthermore this is a
* convenient place to get the request-uri (before any subrequests etc
* are initiated) and to initialize the request_config.
*
* Note that this must be called after mod_proxy had its go so that
* r->proxyreq is set correctly.
*/
static int update_nonce_count(request_rec *r)
{
digest_header_rec *resp;
int res;
if (!ap_is_initial_req(r))
return DECLINED;
resp = ap_pcalloc(r->pool, sizeof(digest_header_rec));
resp->request_uri = &r->parsed_uri;
resp->needed_auth = 0;
ap_set_module_config(r->request_config, &digest_auth_module, resp);
res = get_digest_rec(r, resp);
resp->client = get_client(resp->opaque_num, r);
if (res == OK && resp->client)
resp->client->nonce_count++;
return DECLINED;
}
/*
* Nonce generation code
*/
/* The hash part of the nonce is a SHA-1 hash of the time, realm, opaque,
* and our secret.
*/
static void gen_nonce_hash(char *hash, const char *timestr, const char *opaque,
const server_rec *server,
const digest_config_rec *conf)
{
const char *hex = "0123456789abcdef";
unsigned char sha1[SHA_DIGESTSIZE];
AP_SHA1_CTX ctx;
int idx;
memcpy(&ctx, &conf->nonce_ctx, sizeof(ctx));
ap_SHA1Update_binary(&ctx, (const unsigned char *) server->server_hostname,
strlen(server->server_hostname));
ap_SHA1Update_binary(&ctx, (const unsigned char *) &server->port,
sizeof(server->port));
ap_SHA1Update_binary(&ctx, (const unsigned char *) timestr, strlen(timestr));
if (opaque)
ap_SHA1Update_binary(&ctx, (const unsigned char *) opaque,
strlen(opaque));
ap_SHA1Final(sha1, &ctx);
for (idx=0; idx> 4];
*hash++ = hex[sha1[idx] & 0xF];
}
*hash++ = '\0';
}
/* The nonce has the format b64(time)+hash .
*/
static const char *gen_nonce(pool *p, time_t now, const char *opaque,
const server_rec *server,
const digest_config_rec *conf)
{
char *nonce = ap_palloc(p, NONCE_LEN+1);
time_rec t;
if (conf->nonce_lifetime != 0)
t.time = now;
else
#ifdef HAVE_SHMEM_MM
/* this counter is not synch'd, because it doesn't really matter
* if it counts exactly.
*/
t.time = (*otn_counter)++;
#else /* HAVE_SHMEM_MM */
t.time = 42;
#endif /* HAVE_SHMEM_MM */
ap_base64encode_binary(nonce, t.arr, sizeof(t.arr));
gen_nonce_hash(nonce+NONCE_TIME_LEN, nonce, opaque, server, conf);
return nonce;
}
/*
* Opaque and hash-table management
*/
#ifdef HAVE_SHMEM_MM
/*
* Generate a new client entry, add it to the list, and return the
* entry. Returns NULL if failed.
*/
static client_entry *gen_client(const request_rec *r)
{
unsigned long op;
client_entry new = { 0, NULL, 0, "", "" }, *entry;
if (!opaque_mm) return 0;
mm_lock(opaque_mm, MM_LOCK_RW);
op = (*opaque_cntr)++;
mm_unlock(opaque_mm);
if (!(entry = add_client(op, &new, r->server))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"Digest: failed to allocate client entry - ignoring "
"client");
return NULL;
}
return entry;
}
#else /* HAVE_SHMEM_MM */
static client_entry *gen_client(const request_rec *r) { return NULL; }
#endif /* HAVE_SHMEM_MM */
/*
* MD5-sess code.
*
* If you want to use algorithm=MD5-sess you must write get_userpw_hash()
* yourself (see below). The dummy provided here just returns the hash
* from the auth-file, i.e. it is only useful for testing client
* implementations of MD5-sess .
*/
/*
* get_userpw_hash() will be called each time a new session needs to be
* generated and is expected to return the equivalent of
*
* ap_md5(r->pool,
* ap_pstrcat(r->pool, username, ":", ap_auth_name(r), ":", passwd))
*
* You must implement this yourself, and will probably consist of code
* contacting the password server and retrieving the hash from it.
*
* TBD: This function should probably be in a seperate source file so that
* people need not modify mod_auth_digest.c each time they install a new version
* of apache.
*/
static const char *get_userpw_hash(const request_rec *r,
const digest_header_rec *resp,
const digest_config_rec *conf)
{
/* for now, just get it from pwfile */
return conf->ha1;
}
static const char *get_session(const request_rec *r,
digest_header_rec *resp,
const digest_config_rec *conf)
{
const char *ha1 = NULL, *urp;
/* get ha1 from client list */
if (resp->opaque && resp->client)
ha1 = resp->client->ha1;
/* generate new session if necessary */
if (ha1 == NULL || ha1[0] == '\0') {
urp = get_userpw_hash(r, resp, conf);
ha1 = ap_md5(r->pool,
(unsigned char *) ap_pstrcat(r->pool, ha1, ":", resp->nonce,
":", resp->cnonce, NULL));
if (!resp->client)
resp->client = gen_client(r);
if (resp->client)
memcpy(resp->client->ha1, ha1, 17);
}
return ha1;
}
static void clear_session(const digest_header_rec *resp)
{
if (resp->client)
resp->client->ha1[0] = '\0';
}
/*
* Authorization challenge generation code (for WWW-Authenticate)
*/
static const char *guess_domain(pool *p, const char *uri, const char *filename,
const char *dir)
{
size_t u_len = strlen(uri), f_len = strlen(filename), d_len = strlen(dir);
const char *u, *f;
/* Because of things like mod_alias and mod_rewrite and the fact that
* protection is often on a directory basis (not a location basis) it
* is hard to determine the uri to put in the domain attribute.
*
* What we do is the following: first we see if the directory is
* a prefix for the uri - if this is the case we assume that therefore
* a directive was protecting this uri and we can use it
* for the domain.
*/
if (u_len >= d_len && !memcmp(uri, dir, d_len))
return dir;
/* Now we check for , and if we find one we send back a
* dummy uri - this is the only way to specify that the protection
* space only covers a single uri.
*/
if (dir[0] != '/')
/* This doesn't work for Amaya (ok, it's of arguable validity in
* the first place), so just return the file name instead
return "http://0.0.0.0/";
*/
return dir;
/* Next we find the largest common common suffix of the request-uri
* and the final file name, ignoring any extensions; this gives us a
* hint as to where any rewriting could've occured (assuming that some
* prefix of the uri is rewritten, not a suffix).
*/
u = uri + u_len - 1; /* strip any extension */
while (u > uri && *u != '/') u--;
while (*u && *u != '.') u++;
if (*u == '.') u--;
if (*u == '/') u--;
f = filename + f_len - 1; /* strip any extension */
while (f > filename && *f != '/') f--;
while (*f && *f != '.') f++;
if (*f == '.') f--;
if (*f == '/') f--;
while (*f == *u && f > filename && u > uri) u--, f--;
f++; u++;
while (*f && *f != '/') f++, u++; /* suffix must start with / */
/* Now, if the directory reaches into this common suffix then we can
* take the uri with the same reach.
*/
if ((unsigned long) (f-filename) < d_len) {
char *tmp = ap_pstrdup(p, uri);
tmp[(u-uri)+(d_len-(f-filename))] = '\0';
return tmp;
}
return ""; /* give up */
}
static const char *ltox(pool *p, unsigned long num)
{
if (num != 0)
return ap_psprintf(p, "%lx", num);
else
return "";
}
static void note_digest_auth_failure(request_rec *r,
const digest_config_rec *conf,
digest_header_rec *resp, int stale)
{
const char *qop, *opaque, *opaque_param, *domain, *nonce;
int cnt;
/* Setup qop */
if (conf->qop_list[0] == NULL)
qop = ", qop=\"auth\"";
else if (!strcasecmp(conf->qop_list[0], "none"))
qop = "";
else {
qop = ap_pstrcat(r->pool, ", qop=\"", conf->qop_list[0], NULL);
for (cnt=1; conf->qop_list[cnt] != NULL; cnt++)
qop = ap_pstrcat(r->pool, qop, ",", conf->qop_list[cnt], NULL);
qop = ap_pstrcat(r->pool, qop, "\"", NULL);
}
/* MD5-sess stuff */
if (!stale && !strcasecmp(conf->algorithm, "MD5-sess"))
clear_session(resp);
/* Setup opaque */
if (resp->opaque == NULL) {
/* new client */
if ((conf->check_nc || conf->nonce_lifetime == 0
|| !strcasecmp(conf->algorithm, "MD5-sess"))
&& (resp->client = gen_client(r)) != NULL)
opaque = ltox(r->pool, resp->client->key);
else
opaque = ""; /* opaque not needed */
}
else if (resp->client == NULL) {
/* client info was gc'd */
resp->client = gen_client(r);
if (resp->client != NULL) {
opaque = ltox(r->pool, resp->client->key);
stale = 1;
client_list->num_renewed++;
}
else
opaque = ""; /* ??? */
}
else {
opaque = resp->opaque;
/* we're generating a new nonce, so reset the nonce-count */
resp->client->nonce_count = 0;
}
if (opaque[0])
opaque_param = ap_pstrcat(r->pool, ", opaque=\"", opaque, "\"", NULL);
else
opaque_param = NULL;
/* Setup nonce */
nonce = gen_nonce(r->pool, r->request_time, opaque, r->server, conf);
if (resp->client && conf->nonce_lifetime == 0)
memcpy(resp->client->last_nonce, nonce, NONCE_LEN+1);
/* setup domain attribute. We want to send this attribute wherever
* possible so that the client won't send the Authorization header
* unneccessarily (it's usually > 200 bytes!).
*/
if (conf->uri_list)
domain = conf->uri_list;
else {
/* They didn't specify any domain, so let's guess at it */
domain = guess_domain(r->pool, resp->request_uri->path, r->filename,
conf->dir_name);
if (domain[0] == '/' && domain[1] == '\0')
domain = ""; /* "/" is the default, so no need to send it */
else
domain = ap_pstrcat(r->pool, ", domain=\"", domain, "\"", NULL);
}
ap_table_mergen(r->err_headers_out,
r->proxyreq ? "Proxy-Authenticate" : "WWW-Authenticate",
ap_psprintf(r->pool, "Digest realm=\"%s\", nonce=\"%s\", "
"algorithm=%s%s%s%s%s",
ap_auth_name(r), nonce, conf->algorithm,
opaque_param ? opaque_param : "",
domain ? domain : "",
stale ? ", stale=true" : "", qop));
}
/*
* Authorization header verification code
*/
static const char *get_hash(request_rec *r, const char *user,
const char *realm, const char *auth_pwfile)
{
configfile_t *f;
char l[MAX_STRING_LEN];
const char *rpw;
char *w, *x;
if (!(f = ap_pcfg_openfile(r->pool, auth_pwfile))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"Digest: Could not open password file: %s", auth_pwfile);
return NULL;
}
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
if ((l[0] == '#') || (!l[0]))
continue;
rpw = l;
w = ap_getword(r->pool, &rpw, ':');
x = ap_getword(r->pool, &rpw, ':');
if (x && w && !strcmp(user, w) && !strcmp(realm, x)) {
ap_cfg_closefile(f);
return ap_pstrdup(r->pool, rpw);
}
}
ap_cfg_closefile(f);
return NULL;
}
static int check_nc(const request_rec *r, const digest_header_rec *resp,
const digest_config_rec *conf)
{
if (conf->check_nc && client_mm) {
unsigned long nc;
const char *snc = resp->nonce_count;
char *endptr;
nc = strtol(snc, &endptr, 16);
if (endptr < (snc+strlen(snc)) && !ap_isspace(*endptr)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: invalid nc %s received - not a number", snc);
return !OK;
}
if (!resp->client)
return !OK;
if (nc != resp->client->nonce_count) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r,
"nonce-count check failed: %lu != %lu", nc,
resp->client->nonce_count);
return !OK;
}
}
return OK;
}
static int check_nonce(request_rec *r, digest_header_rec *resp,
const digest_config_rec *conf)
{
double dt;
time_rec nonce_time;
char tmp, hash[NONCE_HASH_LEN+1];
if (strlen(resp->nonce) != NONCE_LEN) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: invalid nonce %s received - length is not %d",
resp->nonce, NONCE_LEN);
note_digest_auth_failure(r, conf, resp, 1);
return AUTH_REQUIRED;
}
tmp = resp->nonce[NONCE_TIME_LEN];
resp->nonce[NONCE_TIME_LEN] = '\0';
ap_base64decode_binary(nonce_time.arr, resp->nonce);
gen_nonce_hash(hash, resp->nonce, resp->opaque, r->server, conf);
resp->nonce[NONCE_TIME_LEN] = tmp;
resp->nonce_time = nonce_time.time;
if (strcmp(hash, resp->nonce+NONCE_TIME_LEN)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: invalid nonce %s received - hash is not %s",
resp->nonce, hash);
note_digest_auth_failure(r, conf, resp, 1);
return AUTH_REQUIRED;
}
dt = difftime(r->request_time, nonce_time.time);
if (conf->nonce_lifetime > 0 && dt < 0) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: invalid nonce %s received - user attempted "
"time travel", resp->nonce);
note_digest_auth_failure(r, conf, resp, 1);
return AUTH_REQUIRED;
}
if (conf->nonce_lifetime > 0) {
if (dt > conf->nonce_lifetime) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, r,
"Digest: user %s: nonce expired - sending new nonce",
r->connection->user);
note_digest_auth_failure(r, conf, resp, 1);
return AUTH_REQUIRED;
}
}
else if (conf->nonce_lifetime == 0 && resp->client) {
if (memcmp(resp->client->last_nonce, resp->nonce, NONCE_LEN)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, r,
"Digest: user %s: one-time-nonce mismatch - sending "
"new nonce", r->connection->user);
note_digest_auth_failure(r, conf, resp, 1);
return AUTH_REQUIRED;
}
}
/* else (lifetime < 0) => never expires */
return OK;
}
/* The actual MD5 code... whee */
static const char *old_digest(const request_rec *r,
const digest_header_rec *resp, const char *ha1)
{
const char *ha2;
/* rfc-2069 */
ha2 = ap_md5(r->pool, (unsigned char *)ap_pstrcat(r->pool, r->method, ":",
resp->uri, NULL));
return ap_md5(r->pool,
(unsigned char *)ap_pstrcat(r->pool, ha1, ":", resp->nonce,
":", ha2, NULL));
}
static const char *new_digest(const request_rec *r,
digest_header_rec *resp,
const digest_config_rec *conf)
{
const char *ha1, *ha2, *a2;
/* draft-ietf-http-authentication-03 */
if (resp->algorithm && !strcasecmp(resp->algorithm, "MD5-sess"))
ha1 = get_session(r, resp, conf);
else
ha1 = conf->ha1;
if (resp->message_qop && !strcasecmp(resp->message_qop, "auth-int"))
a2 = ap_pstrcat(r->pool, r->method, ":", resp->uri, ":",
ap_md5(r->pool, (const unsigned char*) ""), NULL); /* TBD */
else
a2 = ap_pstrcat(r->pool, r->method, ":", resp->uri, NULL);
ha2 = ap_md5(r->pool, (const unsigned char *)a2);
return ap_md5(r->pool,
(unsigned char *)ap_pstrcat(r->pool, ha1, ":", resp->nonce,
":", resp->nonce_count, ":",
resp->cnonce, ":",
resp->message_qop, ":", ha2,
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 the attributes are correct, if it
* really is that user, if the nonce is correct, etc.
*/
static int authenticate_digest_user(request_rec *r)
{
digest_config_rec *conf;
digest_header_rec *resp;
request_rec *mainreq;
conn_rec *conn = r->connection;
const char *t;
int res;
/* do we require Digest auth for this URI? */
if (!(t = ap_auth_type(r)) || strcasecmp(t, "Digest"))
return DECLINED;
if (!ap_auth_name(r)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: need AuthName: %s", r->uri);
return SERVER_ERROR;
}
/* get the client response and mark */
mainreq = r;
while (mainreq->main != NULL) mainreq = mainreq->main;
while (mainreq->prev != NULL) mainreq = mainreq->prev;
resp = (digest_header_rec *) ap_get_module_config(mainreq->request_config,
&digest_auth_module);
resp->needed_auth = 1;
/* get our conf */
conf = (digest_config_rec *) ap_get_module_config(r->per_dir_config,
&digest_auth_module);
/* check for existence and syntax of Auth header */
if (resp->auth_hdr_sts != VALID) {
if (resp->auth_hdr_sts == NOT_DIGEST)
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: client used wrong authentication scheme "
"`%s': %s", resp->scheme, r->uri);
else if (resp->auth_hdr_sts == INVALID)
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: missing user, realm, nonce, uri, or digest "
"in authorization header: %s", r->uri);
/* else (resp->auth_hdr_sts == NO_HEADER) */
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
r->connection->user = (char *) resp->username;
r->connection->ap_auth_type = (char *) "Digest";
/* check the auth attributes */
if (strcmp(resp->uri, resp->request_uri->path)) {
uri_components *r_uri = resp->request_uri, d_uri;
ap_parse_uri_components(r->pool, resp->uri, &d_uri);
if ((d_uri.hostname && d_uri.hostname[0] != '\0'
&& strcasecmp(d_uri.hostname, r->server->server_hostname))
|| (d_uri.port_str && d_uri.port != r->server->port)
|| (!d_uri.port_str && r->server->port != 80)
|| strcmp(d_uri.path, r_uri->path)
|| (d_uri.query != r_uri->query
&& (!d_uri.query || !r_uri->query
|| strcmp(d_uri.query, r_uri->query)))
) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: uri mismatch - <%s> does not match "
"request-uri <%s>", resp->uri,
ap_unparse_uri_components(r->pool, r_uri, 0));
return BAD_REQUEST;
}
}
if (resp->opaque && resp->opaque_num == 0) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: received invalid opaque - got `%s'",
resp->opaque);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
if (strcmp(resp->realm, conf->realm)) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: realm mismatch - got `%s' but expected `%s'",
resp->realm, conf->realm);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
if (resp->algorithm != NULL
&& strcasecmp(resp->algorithm, "MD5")
&& strcasecmp(resp->algorithm, "MD5-sess")) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: unknown algorithm `%s' received: %s",
resp->algorithm, r->uri);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
if (!conf->pwfile)
return DECLINED;
if (!(conf->ha1 = get_hash(r, conn->user, conf->realm, conf->pwfile))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: user `%s' in realm `%s' not found: %s",
conn->user, conf->realm, r->uri);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
if (resp->message_qop == NULL) {
/* old (rfc-2069) style digest */
if (strcmp(resp->digest, old_digest(r, resp, conf->ha1))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: user %s: password mismatch: %s", conn->user,
r->uri);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
}
else {
int match = 0, idx;
for (idx=0; conf->qop_list[idx] != NULL; idx++) {
if (!strcasecmp(conf->qop_list[idx], resp->message_qop)) {
match = 1;
break;
}
}
if (!match
&& !(conf->qop_list[0] == NULL
&& !strcasecmp(resp->message_qop, "auth"))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: invalid qop `%s' received: %s",
resp->message_qop, r->uri);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
if (strcmp(resp->digest, new_digest(r, resp, conf))) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: user %s: password mismatch: %s", conn->user,
r->uri);
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
}
if (check_nc(r, resp, conf) != OK) {
note_digest_auth_failure(r, conf, resp, 0);
return AUTH_REQUIRED;
}
/* Note: this check is done last so that a "stale=true" can be
generated if the nonce is old */
if ((res = check_nonce(r, resp, conf)))
return res;
return OK;
}
/*
* Checking ID
*/
static table *groups_for_user(request_rec *r, const char *user,
const char *grpfile)
{
configfile_t *f;
table *grps = ap_make_table(r->pool, 15);
pool *sp;
char l[MAX_STRING_LEN];
const char *group_name, *ll, *w;
if (!(f = ap_pcfg_openfile(r->pool, grpfile))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"Digest: Could not open group file: %s", grpfile);
return NULL;
}
sp = ap_make_sub_pool(r->pool);
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
if ((l[0] == '#') || (!l[0]))
continue;
ll = l;
ap_clear_pool(sp);
group_name = ap_getword(sp, &ll, ':');
while (ll[0]) {
w = ap_getword_conf(sp, &ll);
if (!strcmp(w, user)) {
ap_table_setn(grps, ap_pstrdup(r->pool, group_name), "in");
break;
}
}
}
ap_cfg_closefile(f);
ap_destroy_pool(sp);
return grps;
}
static int digest_check_auth(request_rec *r)
{
const digest_config_rec *conf =
(digest_config_rec *) ap_get_module_config(r->per_dir_config,
&digest_auth_module);
const char *user = r->connection->user;
int m = r->method_number;
int method_restricted = 0;
register int x;
const char *t, *w;
table *grpstatus;
const array_header *reqs_arr;
require_line *reqs;
if (!(t = ap_auth_type(r)) || strcasecmp(t, "Digest"))
return DECLINED;
reqs_arr = ap_requires(r);
/* If there is no "requires" directive, then any user will do.
*/
if (!reqs_arr)
return OK;
reqs = (require_line *) reqs_arr->elts;
if (conf->grpfile)
grpstatus = groups_for_user(r, user, conf->grpfile);
else
grpstatus = NULL;
for (x = 0; x < reqs_arr->nelts; x++) {
if (!(reqs[x].method_mask & (1 << m)))
continue;
method_restricted = 1;
t = reqs[x].requirement;
w = ap_getword_white(r->pool, &t);
if (!strcasecmp(w, "valid-user"))
return OK;
else if (!strcasecmp(w, "user")) {
while (t[0]) {
w = ap_getword_conf(r->pool, &t);
if (!strcmp(user, w))
return OK;
}
}
else if (!strcasecmp(w, "group")) {
if (!grpstatus)
return DECLINED;
while (t[0]) {
w = ap_getword_conf(r->pool, &t);
if (ap_table_get(grpstatus, w))
return OK;
}
}
else {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: access to %s failed, reason: unknown require "
"directive \"%s\"", r->uri, reqs[x].requirement);
return DECLINED;
}
}
if (!method_restricted)
return OK;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"Digest: access to %s failed, reason: user %s not allowed access",
r->uri, user);
note_digest_auth_failure(r, conf,
(digest_header_rec *) ap_get_module_config(r->request_config,
&digest_auth_module),
0);
return AUTH_REQUIRED;
}
/*
* Authorization-Info header code
*/
#ifdef SEND_DIGEST
static const char *hdr(const table *tbl, const char *name)
{
const char *val = ap_table_get(tbl, name);
if (val)
return val;
else
return "";
}
#endif
static int add_auth_info(request_rec *r)
{
const digest_config_rec *conf =
(digest_config_rec *) ap_get_module_config(r->per_dir_config,
&digest_auth_module);
digest_header_rec *resp =
(digest_header_rec *) ap_get_module_config(r->request_config,
&digest_auth_module);
const char *ai = NULL, *digest = NULL, *nextnonce = "";
if (resp == NULL || !resp->needed_auth || conf == NULL)
return OK;
/* rfc-2069 digest
*/
if (resp->message_qop == NULL) {
/* old client, so calc rfc-2069 digest */
#ifdef SEND_DIGEST
/* most of this totally bogus because the handlers don't set the
* headers until the final handler phase (I wonder why this phase
* is called fixup when there's almost nothing you can fix up...)
*
* Because it's basically impossible to get this right (e.g. the
* Content-length is never set yet when we get here, and we can't
* calc the entity hash) it's best to just leave this #def'd out.
*/
char *entity_info =
ap_md5(r->pool,
(unsigned char *) ap_pstrcat(r->pool,
ap_unparse_uri_components(r->pool,
resp->request_uri, 0), ":",
r->content_type ? r->content_type : ap_default_type(r), ":",
hdr(r->headers_out, "Content-Length"), ":",
r->content_encoding ? r->content_encoding : "", ":",
hdr(r->headers_out, "Last-Modified"), ":",
r->no_cache && !ap_table_get(r->headers_out, "Expires") ?
ap_gm_timestr_822(r->pool, r->request_time) :
hdr(r->headers_out, "Expires"),
NULL));
digest =
ap_md5(r->pool,
(unsigned char *)ap_pstrcat(r->pool, conf->ha1, ":",
resp->nonce, ":",
r->method, ":",
ap_gm_timestr_822(r->pool, r->request_time), ":",
entity_info, ":",
ap_md5(r->pool, (unsigned char *) ""), /* H(entity) - TBD */
NULL));
#endif
}
/* setup nextnonce
*/
if (conf->nonce_lifetime > 0) {
/* send nextnonce if current nonce will expire in less than 30 secs */
if (difftime(r->request_time, resp->nonce_time) > (conf->nonce_lifetime-NEXTNONCE_DELTA)) {
nextnonce = ap_pstrcat(r->pool, ", nextnonce=\"",
gen_nonce(r->pool, r->request_time,
resp->opaque, r->server, conf),
"\"", NULL);
resp->client->nonce_count = 0;
}
}
else if (conf->nonce_lifetime == 0 && resp->client) {
const char *nonce = gen_nonce(r->pool, 0, resp->opaque, r->server,
conf);
nextnonce = ap_pstrcat(r->pool, ", nextnonce=\"", nonce, "\"", NULL);
memcpy(resp->client->last_nonce, nonce, NONCE_LEN+1);
}
/* else nonce never expires, hence no nextnonce */
/* do rfc-2069 digest
*/
if (conf->qop_list[0] && !strcasecmp(conf->qop_list[0], "none")
&& resp->message_qop == NULL) {
/* use only RFC-2069 format */
if (digest)
ai = ap_pstrcat(r->pool, "digest=\"", digest, "\"", nextnonce,NULL);
else
ai = nextnonce;
}
else {
const char *resp_dig, *ha1, *a2, *ha2;
/* calculate rspauth attribute
*/
if (resp->algorithm && !strcasecmp(resp->algorithm, "MD5-sess"))
ha1 = get_session(r, resp, conf);
else
ha1 = conf->ha1;
if (resp->message_qop && !strcasecmp(resp->message_qop, "auth-int"))
a2 = ap_pstrcat(r->pool, ":", resp->uri, ":",
ap_md5(r->pool, (const unsigned char *) ""), NULL); /* TBD */
else
a2 = ap_pstrcat(r->pool, ":", resp->uri, NULL);
ha2 = ap_md5(r->pool, (const unsigned char *)a2);
resp_dig = ap_md5(r->pool,
(unsigned char *)ap_pstrcat(r->pool, ha1, ":",
resp->nonce, ":",
resp->nonce_count, ":",
resp->cnonce, ":",
resp->message_qop ?
resp->message_qop : "",
":", ha2, NULL));
/* assemble Authentication-Info header
*/
ai = ap_pstrcat(r->pool,
"rspauth=\"", resp_dig, "\"",
nextnonce,
resp->cnonce ? ", cnonce=\"" : "",
resp->cnonce ? ap_escape_quotes(r->pool, resp->cnonce) :
"",
resp->cnonce ? "\"" : "",
resp->nonce_count ? ", nc=" : "",
resp->nonce_count ? resp->nonce_count : "",
resp->message_qop ? ", qop=" : "",
resp->message_qop ? resp->message_qop : "",
digest ? "digest=\"" : "",
digest ? digest : "",
digest ? "\"" : "",
NULL);
}
if (ai && ai[0])
ap_table_mergen(r->headers_out,
r->proxyreq ? "Proxy-Authentication-Info" :
"Authentication-Info",
ai);
return OK;
}
module MODULE_VAR_EXPORT digest_auth_module =
{
STANDARD_MODULE_STUFF,
initialize_module, /* 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 */
add_auth_info, /* fixups */
NULL, /* logger */
NULL, /* header parser */
NULL, /* child_init */
NULL, /* child_exit */
update_nonce_count /* post read-request */
};