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lighttpd1.4/src/mod_authn_file.c

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#include "first.h"
/*(htpasswd)*/
#ifdef HAVE_CRYPT_H
# include <crypt.h>
#elif defined(__linux__)
/* linux needs _XOPEN_SOURCE */
# define _XOPEN_SOURCE
#elif !defined(_MSC_VER)
#include <unistd.h>
#endif
#if defined(HAVE_LIBCRYPT) && !defined(HAVE_CRYPT)
/* always assume crypt() is present if we have -lcrypt */
# define HAVE_CRYPT
#endif
#include <stdlib.h>
#include <string.h>
#include "mod_auth_api.h"
#include "sys-crypto-md.h" /* USE_LIB_CRYPTO */
#include "base64.h"
#include "ck.h"
#include "fdevent.h"
#include "log.h"
#include "plugin.h"
#include "request.h"
/*
* htdigest, htpasswd, plain auth backends
*/
typedef struct {
const buffer *auth_plain_groupfile;
const buffer *auth_plain_userfile;
const buffer *auth_htdigest_userfile;
const buffer *auth_htpasswd_userfile;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
} plugin_data;
static handler_t mod_authn_file_htdigest_digest(request_st *r, void *p_d, http_auth_info_t *ai);
static handler_t mod_authn_file_htdigest_basic(request_st *r, void *p_d, const http_auth_require_t *require, const buffer *username, const char *pw);
static handler_t mod_authn_file_plain_digest(request_st *r, void *p_d, http_auth_info_t *ai);
static handler_t mod_authn_file_plain_basic(request_st *r, void *p_d, const http_auth_require_t *require, const buffer *username, const char *pw);
static handler_t mod_authn_file_htpasswd_basic(request_st *r, void *p_d, const http_auth_require_t *require, const buffer *username, const char *pw);
INIT_FUNC(mod_authn_file_init) {
static http_auth_backend_t http_auth_backend_htdigest =
{ "htdigest", mod_authn_file_htdigest_basic, mod_authn_file_htdigest_digest, NULL };
static http_auth_backend_t http_auth_backend_htpasswd =
{ "htpasswd", mod_authn_file_htpasswd_basic, NULL, NULL };
static http_auth_backend_t http_auth_backend_plain =
{ "plain", mod_authn_file_plain_basic, mod_authn_file_plain_digest, NULL };
plugin_data *p = calloc(1, sizeof(*p));
/* register http_auth_backend_htdigest */
http_auth_backend_htdigest.p_d = p;
http_auth_backend_set(&http_auth_backend_htdigest);
/* register http_auth_backend_htpasswd */
http_auth_backend_htpasswd.p_d = p;
http_auth_backend_set(&http_auth_backend_htpasswd);
/* register http_auth_backend_plain */
http_auth_backend_plain.p_d = p;
http_auth_backend_set(&http_auth_backend_plain);
return p;
}
static void mod_authn_file_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* auth.backend.plain.groupfile */
pconf->auth_plain_groupfile = cpv->v.b;
break;
case 1: /* auth.backend.plain.userfile */
pconf->auth_plain_userfile = cpv->v.b;
break;
case 2: /* auth.backend.htdigest.userfile */
pconf->auth_htdigest_userfile = cpv->v.b;
break;
case 3: /* auth.backend.htpasswd.userfile */
pconf->auth_htpasswd_userfile = cpv->v.b;
break;
default:/* should not happen */
return;
}
}
static void mod_authn_file_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_authn_file_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_authn_file_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_authn_file_merge_config(&p->conf,
p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_authn_file_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("auth.backend.plain.groupfile"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("auth.backend.plain.userfile"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("auth.backend.htdigest.userfile"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("auth.backend.htpasswd.userfile"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_authn_file"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* auth.backend.plain.groupfile */
case 1: /* auth.backend.plain.userfile */
case 2: /* auth.backend.htdigest.userfile */
case 3: /* auth.backend.htpasswd.userfile */
if (buffer_is_blank(cpv->v.b))
cpv->v.b = NULL;
break;
default:/* should not happen */
break;
}
}
}
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_authn_file_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
static void mod_authn_file_digest(http_auth_info_t *ai, const char *pw, size_t pwlen) {
li_md_iov_fn digest_iov = MD5_iov;
/* (ai->dalgo & HTTP_AUTH_DIGEST_MD5) default */
#ifdef USE_LIB_CRYPTO
if (ai->dalgo & HTTP_AUTH_DIGEST_SHA256)
digest_iov = SHA256_iov;
#ifdef USE_LIB_CRYPTO_SHA512_256
else if (ai->dalgo & HTTP_AUTH_DIGEST_SHA512_256)
digest_iov = SHA512_256_iov;
#endif
#endif
struct const_iovec iov[] = {
{ ai->username, ai->ulen }
,{ ":", 1 }
,{ ai->realm, ai->rlen }
,{ ":", 1 }
,{ pw, pwlen }
};
digest_iov(ai->digest, iov, sizeof(iov)/sizeof(*iov));
}
static int mod_authn_file_htdigest_get_loop(const char *data, const buffer *auth_fn, http_auth_info_t *ai, log_error_st *errh) {
const char *f_user = data, *n;
do {
n = strchr(f_user, '\n');
/* (last line might not end in '\n') */
if (NULL == n) n = f_user + strlen(f_user);
char *f_pwd, *f_realm;
size_t u_len, r_len;
/* skip blank lines and comment lines (beginning '#') */
if (f_user[0] == '\n' || f_user[0] == '\r' ||
f_user[0] == '#' || f_user[0] == '\0') continue;
/* skip excessively long lines */
if (n - f_user > 1024) continue;
/*
* htdigest format
*
* user:realm:md5(user:realm:password)
*/
if (NULL == (f_realm = memchr(f_user, ':', n - f_user))
|| NULL == (f_pwd = memchr(f_realm+1, ':', n - (f_realm+1)))) {
log_error(errh, __FILE__, __LINE__,
"parse error in %s expected 'username:realm:hashed password'",
auth_fn->ptr);
continue; /* skip bad lines */
}
/* get pointers to the fields */
u_len = f_realm - f_user;
f_realm++;
r_len = f_pwd - f_realm;
f_pwd++;
if (ai->ulen == u_len && ai->rlen == r_len
&& 0 == memcmp(ai->username, f_user, u_len)
&& 0 == memcmp(ai->realm, f_realm, r_len)) {
/* found */
size_t pwd_len = n - f_pwd;
if (f_pwd[pwd_len-1] == '\r') --pwd_len;
if (pwd_len != (ai->dlen << 1)) continue;
return li_hex2bin(ai->digest, sizeof(ai->digest), f_pwd, pwd_len);
}
} while (*n && *(f_user = n+1));
return -1;
}
static int mod_authn_file_htdigest_get(request_st * const r, void *p_d, http_auth_info_t * const ai) {
plugin_data *p = (plugin_data *)p_d;
mod_authn_file_patch_config(r, p);
const buffer * const auth_fn = p->conf.auth_htdigest_userfile;
if (!auth_fn) return -1;
off_t dlen = 64*1024*1024;/*(arbitrary limit: 64 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(auth_fn->ptr,&dlen,r->conf.errh,malloc,free);
if (NULL == data) return -1;
int rc = mod_authn_file_htdigest_get_loop(data, auth_fn, ai, r->conf.errh);
ck_memzero(data, (size_t)dlen);
free(data);
return rc;
}
static handler_t mod_authn_file_htdigest_digest(request_st * const r, void *p_d, http_auth_info_t * const ai) {
return (0 == mod_authn_file_htdigest_get(r, p_d, ai))
? HANDLER_GO_ON
: HANDLER_ERROR;
}
static handler_t mod_authn_file_htdigest_basic(request_st * const r, void *p_d, const http_auth_require_t * const require, const buffer * const username, const char * const pw) {
http_auth_info_t ai;
unsigned char htdigest[sizeof(ai.digest)];
/* supports single choice of algorithm for digest stored in htdigest file */
ai.dalgo = (require->algorithm & ~HTTP_AUTH_DIGEST_SESS);
ai.dlen = http_auth_digest_len(ai.dalgo);
ai.username = username->ptr;
ai.ulen = buffer_clen(username);
ai.realm = require->realm->ptr;
ai.rlen = buffer_clen(require->realm);
if (mod_authn_file_htdigest_get(r, p_d, &ai)) return HANDLER_ERROR;
if (ai.dlen > sizeof(htdigest)) {
ck_memzero(ai.digest, ai.dlen);
return HANDLER_ERROR;/*(should not happen)*/
}
memcpy(htdigest, ai.digest, ai.dlen); /*(save digest before reuse of ai)*/
mod_authn_file_digest(&ai, pw, strlen(pw));
int rc = (ck_memeq_const_time_fixed_len(htdigest, ai.digest, ai.dlen)
&& http_auth_match_rules(require, username->ptr, NULL, NULL));
ck_memzero(htdigest, ai.dlen);
ck_memzero(ai.digest, ai.dlen);
return rc ? HANDLER_GO_ON : HANDLER_ERROR;
}
static int mod_authn_file_htpasswd_get(const buffer *auth_fn, const char *username, size_t userlen, buffer *password, log_error_st *errh) {
if (NULL == username) return -1;
if (!auth_fn) return -1;
off_t dlen = 64*1024*1024;/*(arbitrary limit: 64 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(auth_fn->ptr, &dlen, errh, malloc, free);
if (NULL == data) return -1;
int rc = -1;
const char *f_user = data, *n;
do {
n = strchr(f_user, '\n');
/* (last line might not end in '\n') */
if (NULL == n) n = f_user + strlen(f_user);
char *f_pwd;
size_t u_len;
/* skip blank lines and comment lines (beginning '#') */
if (f_user[0] == '\n' || f_user[0] == '\r' ||
f_user[0] == '#' || f_user[0] == '\0') continue;
/* skip excessively long lines */
if (n - f_user > 1024) continue;
/*
* htpasswd format
*
* user:crypted passwd
*/
if (NULL == (f_pwd = memchr(f_user, ':', n - f_user))) {
log_error(errh, __FILE__, __LINE__,
"parsed error in %s expected 'username:hashed password'",
auth_fn->ptr);
continue; /* skip bad lines */
}
/* get pointers to the fields */
u_len = f_pwd - f_user;
f_pwd++;
if (userlen == u_len && 0 == memcmp(username, f_user, u_len)) {
/* found */
size_t pwd_len = n - f_pwd;
if (f_pwd[pwd_len-1] == '\r') --pwd_len;
buffer_copy_string_len(password, f_pwd, pwd_len);
rc = 0;
break;
}
} while (*n && *(f_user = n+1));
ck_memzero(data, (size_t)dlen);
free(data);
return rc;
}
static handler_t mod_authn_file_plain_digest(request_st * const r, void *p_d, http_auth_info_t * const ai) {
plugin_data *p = (plugin_data *)p_d;
mod_authn_file_patch_config(r, p);
buffer * const tb = r->tmp_buf; /* password-string from auth-backend */
int rc = mod_authn_file_htpasswd_get(p->conf.auth_plain_userfile,
ai->username, ai->ulen, tb,
r->conf.errh);
if (0 != rc) return HANDLER_ERROR;
/* generate password digest from plain-text */
mod_authn_file_digest(ai, BUF_PTR_LEN(tb));
size_t tblen = (buffer_clen(tb) + 63) & ~63u;
buffer_clear(tb);
ck_memzero(tb->ptr, tblen < tb->size ? tblen : tb->size);
return HANDLER_GO_ON;
}
static handler_t mod_authn_file_plain_basic(request_st * const r, void *p_d, const http_auth_require_t * const require, const buffer * const username, const char * const pw) {
plugin_data *p = (plugin_data *)p_d;
mod_authn_file_patch_config(r, p);
buffer * const tb = r->tmp_buf; /* password-string from auth-backend */
int rc = mod_authn_file_htpasswd_get(p->conf.auth_plain_userfile,
BUF_PTR_LEN(username), tb,
r->conf.errh);
if (0 == rc) {
rc = ck_memeq_const_time(BUF_PTR_LEN(tb), pw, strlen(pw)) ? 0 : -1;
size_t tblen = (buffer_clen(tb) + 63) & ~63u;
buffer_clear(tb);
ck_memzero(tb->ptr, tblen < tb->size ? tblen : tb->size);
}
return 0 == rc && http_auth_match_rules(require, username->ptr, NULL, NULL)
? HANDLER_GO_ON
: HANDLER_ERROR;
}
/**
* the $apr1$ handling is taken from apache 1.3.x
* XXX: code has since been modified for slightly better performance
*/
/*
* The apr_md5_encode() routine uses much code obtained from the FreeBSD 3.0
* MD5 crypt() function, which is licenced as follows:
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*/
#define APR_MD5_DIGESTSIZE 16
#define APR1_ID "$apr1$"
/*
* The following MD5 password encryption code was largely borrowed from
* the FreeBSD 3.0 /usr/src/lib/libcrypt/crypt.c file, which is
* licenced as stated above.
*/
static void to64(char *s, unsigned long v, int n)
{
static const unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
static size_t apr_md5_encode(const char *pw, const char *salt, char *result, size_t nbytes) {
force_assert(nbytes >= 37); /*(nbytes should be >= 37)*/
const size_t pwlen = strlen(pw);
ssize_t sl;
/*
* Refine the salt first. It's possible we were given an already-hashed
* string as the salt argument, so extract the actual salt value from it
* if so. Otherwise just use the string up to the first '$' as the salt.
*/
#if 0 /*(already checked and stepped-over in caller)*/
/*
* If it starts with the magic string, then skip that.
*/
if (!strncmp(salt, APR1_ID, sizeof(APR1_ID)-1)) {
salt += sizeof(APR1_ID)-1;
}
#endif
/*
* Get the length of the true salt
*/
/*
* It stops at the first '$' or 8 chars, whichever comes first
*/
for (sl = 0; sl < 8 && salt[sl] != '$' && salt[sl] != '\0'; ++sl) ;
/* result begins with "$apr1$salt$" */
memcpy(result, APR1_ID, sizeof(APR1_ID)-1);
memcpy(result+sizeof(APR1_ID)-1, salt, sl);
result[sizeof(APR1_ID)-1+sl] = '$';
MD5_CTX ctx;
unsigned char final[APR_MD5_DIGESTSIZE];
MD5_Init(&ctx);
MD5_Update(&ctx, pw, pwlen);
MD5_Update(&ctx, salt, sl);
MD5_Update(&ctx, pw, pwlen);
MD5_Final(final, &ctx);
/*
* 'Time to make the doughnuts..'
*/
MD5_Init(&ctx);
/*
* The password first, since that is what is most unknown
*/
MD5_Update(&ctx, pw, pwlen);
#if 0
/*
* Then our magic string
*/
MD5_Update(&ctx, APR1_ID, sizeof(APR1_ID)-1);
/*
* Then the raw salt
*/
MD5_Update(&ctx, salt, sl);
#else
MD5_Update(&ctx, result, sizeof(APR1_ID)-1 + sl);
#endif
/*
* Then just as many characters of the MD5(pw, salt, pw)
*/
for (ssize_t pl = pwlen; pl > 0; pl -= APR_MD5_DIGESTSIZE) {
MD5_Update(&ctx, final,
(pl > APR_MD5_DIGESTSIZE) ? APR_MD5_DIGESTSIZE : pl);
}
/*
* Don't leave anything around in vm they could use.
*/
/*ck_memzero(final, sizeof(final));*/
final[0] = 0; /*(preserve behavior for loop below)*/
/*
* Then something really weird...
*/
for (size_t i = pwlen; i != 0; i >>= 1) {
MD5_Update(&ctx, (i & 1) ? (char *)final : pw, 1);
}
MD5_Final(final, &ctx);
/*
* And now, just to make sure things don't run too fast..
* On a 60 Mhz Pentium this takes 34 msec, so you would
* need 30 seconds to build a 1000 entry dictionary...
*/
for (int i = 0; i < 1000; ++i) {
MD5_Init(&ctx);
if (i & 1) {
MD5_Update(&ctx, pw, pwlen);
}
else {
MD5_Update(&ctx, final, APR_MD5_DIGESTSIZE);
}
if (i % 3) {
MD5_Update(&ctx, salt, sl);
}
if (i % 7) {
MD5_Update(&ctx, pw, pwlen);
}
if (i & 1) {
MD5_Update(&ctx, final, APR_MD5_DIGESTSIZE);
}
else {
MD5_Update(&ctx, pw, pwlen);
}
MD5_Final(final,&ctx);
}
/*
* Now make the output string. (nbytes checked at top of func)
* Maximum result size below is 37:
* 6 for APR_ID, <= 8 for salt, 1 for '$', 22 for password hash
*/
result += sizeof(APR1_ID)-1 + sl + 1;
to64(result, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4);
to64(result+4, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4);
to64(result+8, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4);
to64(result+12, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4);
to64(result+16, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4);
to64(result+20, final[11] , 2);
/*
* Don't leave anything around in vm they could use.
*/
ck_memzero(final, sizeof(final));
return (sizeof(APR1_ID)-1 + sl + 1 + 22);
}
#if defined(HAVE_CRYPT_R) || defined(HAVE_CRYPT)
static int mod_authn_file_crypt_cmp(const buffer * const password, const char * const pw) {
int rc = -1;
char *crypted = NULL;
#if 0 && defined(HAVE_CRYPT_R)
struct crypt_data crypt_tmp_data;
#ifdef _AIX
memset(&crypt_tmp_data, 0, sizeof(crypt_tmp_data));
#else
crypt_tmp_data.initialized = 0;
#endif
#endif
#ifdef USE_LIB_CRYPTO_MD4 /*(for MD4_*() (e.g. MD4_Update()))*/
/*(caller checked buffer_clen(passwd) >= 13)*/
if (0 == memcmp(password->ptr, CONST_STR_LEN("$1+ntlm$"))) {
/* CRYPT-MD5-NTLM algorithm
* This algorithm allows for the construction of (slightly more)
* secure, salted password hashes from an environment where only
* legacy NTLM hashes are available and where it is not feasible
* to re-hash all the passwords with the MD5-based crypt(). */
/* Note: originally, LM password were limited to 14 chars.
* NTLM passwords limited to 127 chars, and encoding to UCS-2LE
* requires double that, so sample[256] buf is large enough.
* Prior sample[120] size likely taken from apr_md5_encode(). */
char sample[256];
char *b = password->ptr+sizeof("$1+ntlm$")-1;
char *e = strchr(b, '$');
size_t slen = (NULL != e) ? (size_t)(e - b) : sizeof(sample);
size_t pwlen = strlen(pw) * 2;
if (slen < sizeof(sample) - (sizeof("$1$")-1)
&& pwlen < sizeof(sample)) {
/* compute NTLM hash and convert to lowercase hex chars
* (require lc hex chars from li_tohex()) */
if (pwlen) {
/*(reuse sample buffer to encode pw into UCS-2LE)
*(Note: assumes pw input in ISO-8859-1) */
/*(buffer sizes checked above)*/
for (int i=0; i < (int)pwlen; i+=2) {
sample[i] = pw[(i >> 1)];
sample[i+1] = 0;
}
}
char ntlmhash[MD4_DIGEST_LENGTH];
char ntlmhex[MD4_DIGEST_LENGTH*2+1];
MD4_once((unsigned char *)ntlmhash, sample, pwlen);
li_tohex(ntlmhex,sizeof(ntlmhex),ntlmhash,sizeof(ntlmhash));
/*(reuse sample buffer for salt (FYI: expect slen == 8))*/
memcpy(sample, "$1$", sizeof("$1$")-1);
memcpy(sample+sizeof("$1$")-1, b, slen);
sample[sizeof("$1$")-1+slen] = '\0';
#if 0 && defined(HAVE_CRYPT_R)
crypted = crypt_r(ntlmhex, sample, &crypt_tmp_data);
#else
crypted = crypt(ntlmhex, sample);
#endif
if (NULL != crypted
&& 0 == strncmp(crypted, "$1$", sizeof("$1$")-1)) {
rc = strcmp(b, crypted+3); /*skip crypted "$1$" prefix*/
}
ck_memzero(sample, sizeof(sample));
}
}
else
#endif
{
#if 0 && defined(HAVE_CRYPT_R)
crypted = crypt_r(pw, password->ptr, &crypt_tmp_data);
#else
crypted = crypt(pw, password->ptr);
#endif
if (NULL != crypted) {
rc = strcmp(password->ptr, crypted);
}
}
if (NULL != crypted) {
size_t crypwlen = strlen(crypted);
if (crypwlen >= 13) ck_memzero(crypted, crypwlen);
}
return rc;
}
#endif
static handler_t mod_authn_file_htpasswd_basic(request_st * const r, void *p_d, const http_auth_require_t * const require, const buffer * const username, const char * const pw) {
plugin_data *p = (plugin_data *)p_d;
mod_authn_file_patch_config(r, p);
buffer * const tb = r->tmp_buf; /* password-string from auth-backend */
int rc = mod_authn_file_htpasswd_get(p->conf.auth_htpasswd_userfile,
BUF_PTR_LEN(username), tb,
r->conf.errh);
if (0 != rc) return HANDLER_ERROR;
uint32_t tblen = buffer_clen(tb);
rc = -1;
if (tblen >= 5 && 0 == memcmp(tb->ptr, "{SHA}", 5)) {
/* 32 == (5 for "{SHA}" + 28 for base64 of SHA1 (20 bytes)) */
unsigned char digest[SHA_DIGEST_LENGTH*2];
SHA1_once(digest+SHA_DIGEST_LENGTH, pw, strlen(pw));
rc = SHA_DIGEST_LENGTH
== li_base64_dec(digest, sizeof(digest),
tb->ptr+5, tblen-5, BASE64_STANDARD)
&& ck_memeq_const_time_fixed_len(digest, digest+SHA_DIGEST_LENGTH,
SHA_DIGEST_LENGTH);
rc = !rc; /* (0 == rc) for match */
ck_memzero(digest, sizeof(digest));
}
else if (tblen >= 6 && 0 == memcmp(tb->ptr, "$apr1$", 6)) {
char sample[40]; /*(see comments at end of apr_md5_encode())*/
rc = tblen == apr_md5_encode(pw, tb->ptr+6, sample, sizeof(sample))
&& ck_memeq_const_time_fixed_len(sample, tb->ptr, tblen);
rc = !rc; /* (0 == rc) for match */
ck_memzero(sample, sizeof(sample));
}
#if defined(HAVE_CRYPT_R) || defined(HAVE_CRYPT)
/* simple DES password is 2 + 11 characters;
* everything else should be longer */
else if (tblen >= 13) {
rc = mod_authn_file_crypt_cmp(tb, pw);
}
#endif
tblen = (tblen + 63) & ~63u;
buffer_clear(tb);
ck_memzero(tb->ptr, tblen < tb->size ? tblen : tb->size);
return 0 == rc && http_auth_match_rules(require, username->ptr, NULL, NULL)
? HANDLER_GO_ON
: HANDLER_ERROR;
}
int mod_authn_file_plugin_init(plugin *p);
int mod_authn_file_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "authn_file";
p->init = mod_authn_file_init;
p->set_defaults= mod_authn_file_set_defaults;
return 0;
}
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