lighttpd 1.4.x https://www.lighttpd.net/
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#include "server.h"
#include "log.h"
#include "http_auth.h"
#include "inet_ntop_cache.h"
#include "stream.h"
#include "base64.h"
#ifdef HAVE_CRYPT_H
# include <crypt.h>
#elif defined(__linux__)
/* linux needs _XOPEN_SOURCE */
# define _XOPEN_SOURCE
#endif
#if defined(HAVE_LIBCRYPT) && !defined(HAVE_CRYPT)
/* always assume crypt() is present if we have -lcrypt */
# define HAVE_CRYPT
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include "md5.h"
#ifdef USE_OPENSSL
#include <openssl/sha.h>
#endif
#include "safe_memclear.h"
#define HASHLEN 16
#define HASHHEXLEN 32
typedef unsigned char HASH[HASHLEN];
typedef char HASHHEX[HASHHEXLEN+1];
static void CvtHex(const HASH Bin, char Hex[33]) {
li_tohex(Hex, (const char*) Bin, 16);
}
/**
* the $apr1$ handling is taken from apache 1.3.x
*/
/*
* 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
* ----------------------------------------------------------------------------
*/
handler_t auth_ldap_init(server *srv, mod_auth_plugin_config *s);
static int http_auth_get_password(server *srv, mod_auth_plugin_data *p, buffer *username, buffer *realm, buffer *password) {
int ret = -1;
if (buffer_is_empty(username) || buffer_is_empty(realm)) return -1;
if (p->conf.auth_backend == AUTH_BACKEND_HTDIGEST) {
stream f;
char * f_line;
if (buffer_string_is_empty(p->conf.auth_htdigest_userfile)) return -1;
if (0 != stream_open(&f, p->conf.auth_htdigest_userfile)) {
log_error_write(srv, __FILE__, __LINE__, "sbss", "opening digest-userfile", p->conf.auth_htdigest_userfile, "failed:", strerror(errno));
return -1;
}
f_line = f.start;
while (f_line - f.start != f.size) {
char *f_user, *f_pwd, *e, *f_realm;
size_t u_len, pwd_len, r_len;
f_user = f_line;
/*
* htdigest format
*
* user:realm:md5(user:realm:password)
*/
if (NULL == (f_realm = memchr(f_user, ':', f.size - (f_user - f.start) ))) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"parsed error in", p->conf.auth_htdigest_userfile,
"expected 'username:realm:hashed password'");
stream_close(&f);
return -1;
}
if (NULL == (f_pwd = memchr(f_realm + 1, ':', f.size - (f_realm + 1 - f.start)))) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"parsed error in", p->conf.auth_plain_userfile,
"expected 'username:realm:hashed password'");
stream_close(&f);
return -1;
}
/* get pointers to the fields */
u_len = f_realm - f_user;
f_realm++;
r_len = f_pwd - f_realm;
f_pwd++;
if (NULL != (e = memchr(f_pwd, '\n', f.size - (f_pwd - f.start)))) {
pwd_len = e - f_pwd;
} else {
pwd_len = f.size - (f_pwd - f.start);
}
if (buffer_string_length(username) == u_len &&
(buffer_string_length(realm) == r_len) &&
(0 == strncmp(username->ptr, f_user, u_len)) &&
(0 == strncmp(realm->ptr, f_realm, r_len))) {
/* found */
buffer_copy_string_len(password, f_pwd, pwd_len);
ret = 0;
break;
}
/* EOL */
if (!e) break;
f_line = e + 1;
}
stream_close(&f);
} else if (p->conf.auth_backend == AUTH_BACKEND_HTPASSWD ||
p->conf.auth_backend == AUTH_BACKEND_PLAIN) {
stream f;
char * f_line;
buffer *auth_fn;
auth_fn = (p->conf.auth_backend == AUTH_BACKEND_HTPASSWD) ? p->conf.auth_htpasswd_userfile : p->conf.auth_plain_userfile;
if (buffer_string_is_empty(auth_fn)) return -1;
if (0 != stream_open(&f, auth_fn)) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"opening plain-userfile", auth_fn, "failed:", strerror(errno));
return -1;
}
f_line = f.start;
while (f_line - f.start != f.size) {
char *f_user, *f_pwd, *e;
size_t u_len, pwd_len;
f_user = f_line;
/*
* htpasswd format
*
* user:crypted passwd
*/
if (NULL == (f_pwd = memchr(f_user, ':', f.size - (f_user - f.start) ))) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"parsed error in", auth_fn,
"expected 'username:hashed password'");
stream_close(&f);
return -1;
}
/* get pointers to the fields */
u_len = f_pwd - f_user;
f_pwd++;
if (NULL != (e = memchr(f_pwd, '\n', f.size - (f_pwd - f.start)))) {
pwd_len = e - f_pwd;
} else {
pwd_len = f.size - (f_pwd - f.start);
}
if (buffer_string_length(username) == u_len &&
(0 == strncmp(username->ptr, f_user, u_len))) {
/* found */
buffer_copy_string_len(password, f_pwd, pwd_len);
ret = 0;
break;
}
/* EOL */
if (!e) break;
f_line = e + 1;
}
stream_close(&f);
} else if (p->conf.auth_backend == AUTH_BACKEND_LDAP) {
ret = 0;
} else {
return -1;
}
return ret;
}
int http_auth_match_rules(server *srv, array *req, const char *username, const char *group, const char *host) {
const char *r = NULL, *rules = NULL;
int username_len;
data_string *require;
UNUSED(group);
UNUSED(host);
require = (data_string *)array_get_element(req, "require");
/* if we get here, the user we got a authed user */
if (0 == strcmp(require->value->ptr, "valid-user")) {
return 0;
}
/* user=name1|group=name3|host=name4 */
/* seperate the string by | */
#if 0
log_error_write(srv, __FILE__, __LINE__, "sb", "rules", require->value);
#endif
username_len = username ? strlen(username) : 0;
r = rules = require->value->ptr;
while (1) {
const char *eq;
const char *k, *v, *e;
int k_len, v_len, r_len;
e = strchr(r, '|');
if (e) {
r_len = e - r;
} else {
r_len = strlen(rules) - (r - rules);
}
/* from r to r + r_len is a rule */
if (0 == strncmp(r, "valid-user", r_len)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"parsing the 'require' section in 'auth.require' failed: valid-user cannot be combined with other require rules",
require->value);
return -1;
}
/* search for = in the rules */
if (NULL == (eq = strchr(r, '='))) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"parsing the 'require' section in 'auth.require' failed: a = is missing",
require->value);
return -1;
}
/* = out of range */
if (eq > r + r_len) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"parsing the 'require' section in 'auth.require' failed: = out of range",
require->value);
return -1;
}
/* the part before the = is user|group|host */
k = r;
k_len = eq - r;
v = eq + 1;
v_len = r_len - k_len - 1;
if (k_len == 4) {
if (0 == strncmp(k, "user", k_len)) {
if (username &&
username_len == v_len &&
0 == strncmp(username, v, v_len)) {
return 0;
}
} else if (0 == strncmp(k, "host", k_len)) {
log_error_write(srv, __FILE__, __LINE__, "s", "host ... (not implemented)");
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown key");
return -1;
}
} else if (k_len == 5) {
if (0 == strncmp(k, "group", k_len)) {
log_error_write(srv, __FILE__, __LINE__, "s", "group ... (not implemented)");
} else {
log_error_write(srv, __FILE__, __LINE__, "ss", "unknown key", k);
return -1;
}
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown key");
return -1;
}
if (!e) break;
r = e + 1;
}
log_error_write(srv, __FILE__, __LINE__, "s", "nothing matched");
return -1;
}
#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 at the top of this file.
*/
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 void apr_md5_encode(const char *pw, const char *salt, char *result, size_t nbytes) {
/*
* Minimum size is 8 bytes for salt, plus 1 for the trailing NUL,
* plus 4 for the '$' separators, plus the password hash itself.
* Let's leave a goodly amount of leeway.
*/
char passwd[120], *p;
const char *sp, *ep;
unsigned char final[APR_MD5_DIGESTSIZE];
ssize_t sl, pl, i;
li_MD5_CTX ctx, ctx1;
unsigned long l;
/*
* Refine the salt first. It's possible we were given an already-hashed
* string as the salt argument, so extract the actual salt value from it
* if so. Otherwise just use the string up to the first '$' as the salt.
*/
sp = salt;
/*
* If it starts with the magic string, then skip that.
*/
if (!strncmp(sp, APR1_ID, strlen(APR1_ID))) {
sp += strlen(APR1_ID);
}
/*
* It stops at the first '$' or 8 chars, whichever comes first
*/
for (ep = sp; (*ep != '\0') && (*ep != '$') && (ep < (sp + 8)); ep++) {
continue;
}
/*
* Get the length of the true salt
*/
sl = ep - sp;
/*
* 'Time to make the doughnuts..'
*/
li_MD5_Init(&ctx);
/*
* The password first, since that is what is most unknown
*/
li_MD5_Update(&ctx, pw, strlen(pw));
/*
* Then our magic string
*/
li_MD5_Update(&ctx, APR1_ID, strlen(APR1_ID));
/*
* Then the raw salt
*/
li_MD5_Update(&ctx, sp, sl);
/*
* Then just as many characters of the MD5(pw, salt, pw)
*/
li_MD5_Init(&ctx1);
li_MD5_Update(&ctx1, pw, strlen(pw));
li_MD5_Update(&ctx1, sp, sl);
li_MD5_Update(&ctx1, pw, strlen(pw));
li_MD5_Final(final, &ctx1);
for (pl = strlen(pw); pl > 0; pl -= APR_MD5_DIGESTSIZE) {
li_MD5_Update(
&ctx, final,
(pl > APR_MD5_DIGESTSIZE) ? APR_MD5_DIGESTSIZE : pl);
}
/*
* Don't leave anything around in vm they could use.
*/
memset(final, 0, sizeof(final));
/*
* Then something really weird...
*/
for (i = strlen(pw); i != 0; i >>= 1) {
if (i & 1) {
li_MD5_Update(&ctx, final, 1);
}
else {
li_MD5_Update(&ctx, pw, 1);
}
}
/*
* Now make the output string. We know our limitations, so we
* can use the string routines without bounds checking.
*/
strcpy(passwd, APR1_ID);
strncat(passwd, sp, sl);
strcat(passwd, "$");
li_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 (i = 0; i < 1000; i++) {
li_MD5_Init(&ctx1);
if (i & 1) {
li_MD5_Update(&ctx1, pw, strlen(pw));
}
else {
li_MD5_Update(&ctx1, final, APR_MD5_DIGESTSIZE);
}
if (i % 3) {
li_MD5_Update(&ctx1, sp, sl);
}
if (i % 7) {
li_MD5_Update(&ctx1, pw, strlen(pw));
}
if (i & 1) {
li_MD5_Update(&ctx1, final, APR_MD5_DIGESTSIZE);
}
else {
li_MD5_Update(&ctx1, pw, strlen(pw));
}
li_MD5_Final(final,&ctx1);
}
p = passwd + strlen(passwd);
l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p, l, 4); p += 4;
l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p, l, 4); p += 4;
l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p, l, 4); p += 4;
l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p, l, 4); p += 4;
l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p, l, 4); p += 4;
l = final[11] ; to64(p, l, 2); p += 2;
*p = '\0';
/*
* Don't leave anything around in vm they could use.
*/
safe_memclear(final, sizeof(final));
/* FIXME
*/
#define apr_cpystrn strncpy
apr_cpystrn(result, passwd, nbytes - 1);
}
#ifdef USE_OPENSSL
static void apr_sha_encode(const char *pw, char *result, size_t nbytes) {
unsigned char digest[20];
size_t base64_written;
SHA1((const unsigned char*) pw, strlen(pw), digest);
memset(result, 0, nbytes);
/* need 5 bytes for "{SHA}", 28 for base64 (3 bytes -> 4 bytes) of SHA1 (20 bytes), 1 terminating */
if (nbytes < 5 + 28 + 1) return;
memcpy(result, "{SHA}", 5);
base64_written = li_to_base64(result + 5, nbytes - 5, digest, 20, BASE64_STANDARD);
force_assert(base64_written == 28);
result[5 + base64_written] = '\0'; /* terminate string */
}
#endif
/**
*
*
* @param password password-string from the auth-backend
* @param pw password-string from the client
*/
static int http_auth_basic_password_compare(server *srv, mod_auth_plugin_data *p, array *req, buffer *username, buffer *realm, buffer *password, const char *pw) {
UNUSED(srv);
UNUSED(req);
if (p->conf.auth_backend == AUTH_BACKEND_HTDIGEST) {
/*
* htdigest format
*
* user:realm:md5(user:realm:password)
*/
li_MD5_CTX Md5Ctx;
HASH HA1;
char a1[256];
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(username));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(realm));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)pw, strlen(pw));
li_MD5_Final(HA1, &Md5Ctx);
CvtHex(HA1, a1);
if (0 == strcmp(password->ptr, a1)) {
return 0;
}
} else if (p->conf.auth_backend == AUTH_BACKEND_HTPASSWD) {
char sample[120];
if (!strncmp(password->ptr, APR1_ID, strlen(APR1_ID))) {
/*
* The hash was created using $apr1$ custom algorithm.
*/
apr_md5_encode(pw, password->ptr, sample, sizeof(sample));
return (strcmp(sample, password->ptr) == 0) ? 0 : 1;
#ifdef USE_OPENSSL
} else if (0 == strncmp(password->ptr, "{SHA}", 5)) {
apr_sha_encode(pw, sample, sizeof(sample));
return (strcmp(sample, password->ptr) == 0) ? 0 : 1;
#endif
} else {
#if defined(HAVE_CRYPT_R) || defined(HAVE_CRYPT)
char *crypted;
#if defined(HAVE_CRYPT_R)
struct crypt_data crypt_tmp_data;
crypt_tmp_data.initialized = 0;
#endif
/* a simple DES password is 2 + 11 characters. everything else should be longer. */
if (buffer_string_length(password) < 13) {
return -1;
}
#if defined(HAVE_CRYPT_R)
if (0 == (crypted = crypt_r(pw, password->ptr, &crypt_tmp_data))) {
#else
if (0 == (crypted = crypt(pw, password->ptr))) {
#endif
/* crypt failed. */
return -1;
}
if (0 == strcmp(password->ptr, crypted)) {
return 0;
}
#endif
}
} else if (p->conf.auth_backend == AUTH_BACKEND_PLAIN) {
if (0 == strcmp(password->ptr, pw)) {
return 0;
}
} else if (p->conf.auth_backend == AUTH_BACKEND_LDAP) {
#ifdef USE_LDAP
LDAP *ldap;
LDAPMessage *lm, *first;
char *dn;
int ret;
char *attrs[] = { LDAP_NO_ATTRS, NULL };
size_t i, len;
/* for now we stay synchronous */
/*
* 1. connect anonymously (done in plugin init)
* 2. get DN for uid = username
* 3. auth against ldap server
* 4. (optional) check a field
* 5. disconnect
*
*/
/* check username
*
* we have to protect us againt username which modifies out filter in
* a unpleasant way
*/
len = buffer_string_length(username);
for (i = 0; i < len; i++) {
char c = username->ptr[i];
if (!isalpha(c) &&
!isdigit(c) &&
(c != ' ') &&
(c != '@') &&
(c != '-') &&
(c != '_') &&
(c != '.') ) {
log_error_write(srv, __FILE__, __LINE__, "sbd",
"ldap: invalid character (- _.@a-zA-Z0-9 allowed) in username:", username, i);
return -1;
}
}
if (p->conf.auth_ldap_allow_empty_pw != 1 && pw[0] == '\0')
return -1;
/* build filter */
buffer_copy_buffer(p->ldap_filter, p->conf.ldap_filter_pre);
buffer_append_string_buffer(p->ldap_filter, username);
buffer_append_string_buffer(p->ldap_filter, p->conf.ldap_filter_post);
/* 2. */
if (p->anon_conf->ldap == NULL ||
LDAP_SUCCESS != (ret = ldap_search_s(p->anon_conf->ldap, p->conf.auth_ldap_basedn->ptr, LDAP_SCOPE_SUBTREE, p->ldap_filter->ptr, attrs, 0, &lm))) {
/* try again; the ldap library sometimes fails for the first call but reconnects */
if (p->anon_conf->ldap == NULL || ret != LDAP_SERVER_DOWN ||
LDAP_SUCCESS != (ret = ldap_search_s(p->anon_conf->ldap, p->conf.auth_ldap_basedn->ptr, LDAP_SCOPE_SUBTREE, p->ldap_filter->ptr, attrs, 0, &lm))) {
if (auth_ldap_init(srv, p->anon_conf) != HANDLER_GO_ON)
return -1;
if (NULL == p->anon_conf->ldap) return -1;
if (LDAP_SUCCESS != (ret = ldap_search_s(p->anon_conf->ldap, p->conf.auth_ldap_basedn->ptr, LDAP_SCOPE_SUBTREE, p->ldap_filter->ptr, attrs, 0, &lm))) {
log_error_write(srv, __FILE__, __LINE__, "sssb",
"ldap:", ldap_err2string(ret), "filter:", p->ldap_filter);
return -1;
}
}
}
if (NULL == (first = ldap_first_entry(p->anon_conf->ldap, lm))) {
log_error_write(srv, __FILE__, __LINE__, "s", "ldap ...");
ldap_msgfree(lm);
return -1;
}
if (NULL == (dn = ldap_get_dn(p->anon_conf->ldap, first))) {
log_error_write(srv, __FILE__, __LINE__, "s", "ldap ...");
ldap_msgfree(lm);
return -1;
}
ldap_msgfree(lm);
/* 3. */
if (NULL == (ldap = ldap_init(p->conf.auth_ldap_hostname->ptr, LDAP_PORT))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap ...", strerror(errno));
return -1;
}
ret = LDAP_VERSION3;
if (LDAP_OPT_SUCCESS != (ret = ldap_set_option(ldap, LDAP_OPT_PROTOCOL_VERSION, &ret))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap:", ldap_err2string(ret));
ldap_unbind_s(ldap);
return -1;
}
if (p->conf.auth_ldap_starttls == 1) {
if (LDAP_OPT_SUCCESS != (ret = ldap_start_tls_s(ldap, NULL, NULL))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap startTLS failed:", ldap_err2string(ret));
ldap_unbind_s(ldap);
return -1;
}
}
if (LDAP_SUCCESS != (ret = ldap_simple_bind_s(ldap, dn, pw))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap:", ldap_err2string(ret));
ldap_unbind_s(ldap);
return -1;
}
/* 5. */
ldap_unbind_s(ldap);
/* everything worked, good, access granted */
return 0;
#endif
}
return -1;
}
int http_auth_basic_check(server *srv, connection *con, mod_auth_plugin_data *p, array *req, const char *realm_str) {
buffer *username, *password;
char *pw;
data_string *realm;
realm = (data_string *)array_get_element(req, "realm");
username = buffer_init();
if (!buffer_append_base64_decode(username, realm_str, strlen(realm_str), BASE64_STANDARD)) {
log_error_write(srv, __FILE__, __LINE__, "sb", "decodeing base64-string failed", username);
buffer_free(username);
return 0;
}
/* r2 == user:password */
if (NULL == (pw = strchr(username->ptr, ':'))) {
log_error_write(srv, __FILE__, __LINE__, "sb", ": is missing in", username);
buffer_free(username);
return 0;
}
buffer_string_set_length(username, pw - username->ptr);
pw++;
password = buffer_init();
/* copy password to r1 */
if (http_auth_get_password(srv, p, username, realm->value, password)) {
buffer_free(username);
buffer_free(password);
if (AUTH_BACKEND_UNSET == p->conf.auth_backend) {
log_error_write(srv, __FILE__, __LINE__, "s", "auth.backend is not set");
} else {
log_error_write(srv, __FILE__, __LINE__, "ss", "get_password failed, IP:", inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
}
return 0;
}
/* password doesn't match */
if (http_auth_basic_password_compare(srv, p, req, username, realm->value, password, pw)) {
log_error_write(srv, __FILE__, __LINE__, "sbsBss", "password doesn't match for", con->uri.path, "username:", username, ", IP:", inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
buffer_free(username);
buffer_free(password);
return 0;
}
/* value is our allow-rules */
if (http_auth_match_rules(srv, req, username->ptr, NULL, NULL)) {
buffer_free(username);
buffer_free(password);
log_error_write(srv, __FILE__, __LINE__, "s", "rules didn't match");
return 0;
}
/* remember the username */
buffer_copy_buffer(p->auth_user, username);
buffer_free(username);
buffer_free(password);
return 1;
}
typedef struct {
const char *key;
int key_len;
char **ptr;
} digest_kv;
/* return values: -1: error/bad request, 0: failed, 1: success */
int http_auth_digest_check(server *srv, connection *con, mod_auth_plugin_data *p, array *req, const char *realm_str) {
char a1[256];
char a2[256];
char *username = NULL;
char *realm = NULL;
char *nonce = NULL;
char *uri = NULL;
char *algorithm = NULL;
char *qop = NULL;
char *cnonce = NULL;
char *nc = NULL;
char *respons = NULL;
char *e, *c;
const char *m = NULL;
int i;
buffer *password, *b, *username_buf, *realm_buf;
li_MD5_CTX Md5Ctx;
HASH HA1;
HASH HA2;
HASH RespHash;
HASHHEX HA2Hex;
/* init pointers */
#define S(x) \
x, sizeof(x)-1, NULL
digest_kv dkv[10] = {
{ S("username=") },
{ S("realm=") },
{ S("nonce=") },
{ S("uri=") },
{ S("algorithm=") },
{ S("qop=") },
{ S("cnonce=") },
{ S("nc=") },
{ S("response=") },
{ NULL, 0, NULL }
};
#undef S
dkv[0].ptr = &username;
dkv[1].ptr = &realm;
dkv[2].ptr = &nonce;
dkv[3].ptr = &uri;
dkv[4].ptr = &algorithm;
dkv[5].ptr = &qop;
dkv[6].ptr = &cnonce;
dkv[7].ptr = &nc;
dkv[8].ptr = &respons;
UNUSED(req);
if (p->conf.auth_backend != AUTH_BACKEND_HTDIGEST &&
p->conf.auth_backend != AUTH_BACKEND_PLAIN) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: unsupported backend (only htdigest or plain)");
return -1;
}
b = buffer_init_string(realm_str);
/* parse credentials from client */
for (c = b->ptr; *c; c++) {
/* skip whitespaces */
while (*c == ' ' || *c == '\t') c++;
if (!*c) break;
for (i = 0; dkv[i].key; i++) {
if ((0 == strncmp(c, dkv[i].key, dkv[i].key_len))) {
if ((c[dkv[i].key_len] == '"') &&
(NULL != (e = strchr(c + dkv[i].key_len + 1, '"')))) {
/* value with "..." */
*(dkv[i].ptr) = c + dkv[i].key_len + 1;
c = e;
*e = '\0';
} else if (NULL != (e = strchr(c + dkv[i].key_len, ','))) {
/* value without "...", terminated by ',' */
*(dkv[i].ptr) = c + dkv[i].key_len;
c = e;
*e = '\0';
} else {
/* value without "...", terminated by EOL */
*(dkv[i].ptr) = c + dkv[i].key_len;
c += strlen(c) - 1;
}
}
}
}
if (p->conf.auth_debug > 1) {
log_error_write(srv, __FILE__, __LINE__, "ss", "username", username);
log_error_write(srv, __FILE__, __LINE__, "ss", "realm", realm);
log_error_write(srv, __FILE__, __LINE__, "ss", "nonce", nonce);
log_error_write(srv, __FILE__, __LINE__, "ss", "uri", uri);
log_error_write(srv, __FILE__, __LINE__, "ss", "algorithm", algorithm);
log_error_write(srv, __FILE__, __LINE__, "ss", "qop", qop);
log_error_write(srv, __FILE__, __LINE__, "ss", "cnonce", cnonce);
log_error_write(srv, __FILE__, __LINE__, "ss", "nc", nc);
log_error_write(srv, __FILE__, __LINE__, "ss", "response", respons);
}
/* check if everything is transmitted */
if (!username ||
!realm ||
!nonce ||
!uri ||
(qop && (!nc || !cnonce)) ||
!respons ) {
/* missing field */
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: missing field");
buffer_free(b);
return -1;
}
/**
* protect the md5-sess against missing cnonce and nonce
*/
if (algorithm &&
0 == strcasecmp(algorithm, "md5-sess") &&
(!nonce || !cnonce)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: (md5-sess: missing field");
buffer_free(b);
return -1;
}
if (qop && strcasecmp(qop, "auth-int") == 0) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: qop=auth-int not supported");
buffer_free(b);
return -1;
}
m = get_http_method_name(con->request.http_method);
/* password-string == HA1 */
password = buffer_init();
username_buf = buffer_init_string(username);
realm_buf = buffer_init_string(realm);
if (http_auth_get_password(srv, p, username_buf, realm_buf, password)) {
buffer_free(password);
buffer_free(b);
buffer_free(username_buf);
buffer_free(realm_buf);
return 0;
}
buffer_free(username_buf);
buffer_free(realm_buf);
if (p->conf.auth_backend == AUTH_BACKEND_PLAIN) {
/* generate password from plain-text */
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, (unsigned char *)username, strlen(username));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)realm, strlen(realm));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(password));
li_MD5_Final(HA1, &Md5Ctx);
} else if (p->conf.auth_backend == AUTH_BACKEND_HTDIGEST) {
/* HA1 */
/* transform the 32-byte-hex-md5 to a 16-byte-md5 */
for (i = 0; i < HASHLEN; i++) {
HA1[i] = hex2int(password->ptr[i*2]) << 4;
HA1[i] |= hex2int(password->ptr[i*2+1]);
}
} else {
/* we already check that above */
SEGFAULT();
}
buffer_free(password);
if (algorithm &&
strcasecmp(algorithm, "md5-sess") == 0) {
li_MD5_Init(&Md5Ctx);
/* Errata ID 1649: http://www.rfc-editor.org/errata_search.php?rfc=2617 */
CvtHex(HA1, a1);
li_MD5_Update(&Md5Ctx, (unsigned char *)a1, 32);
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)nonce, strlen(nonce));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)cnonce, strlen(cnonce));
li_MD5_Final(HA1, &Md5Ctx);
}
CvtHex(HA1, a1);
/* calculate H(A2) */
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, (unsigned char *)m, strlen(m));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)uri, strlen(uri));
/* qop=auth-int not supported, already checked above */
/*
if (qop && strcasecmp(qop, "auth-int") == 0) {
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *) [body checksum], HASHHEXLEN);
}
*/
li_MD5_Final(HA2, &Md5Ctx);
CvtHex(HA2, HA2Hex);
/* calculate response */
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, (unsigned char *)a1, HASHHEXLEN);
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)nonce, strlen(nonce));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
if (qop && *qop) {
li_MD5_Update(&Md5Ctx, (unsigned char *)nc, strlen(nc));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)cnonce, strlen(cnonce));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
li_MD5_Update(&Md5Ctx, (unsigned char *)qop, strlen(qop));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN(":"));
};
li_MD5_Update(&Md5Ctx, (unsigned char *)HA2Hex, HASHHEXLEN);
li_MD5_Final(RespHash, &Md5Ctx);
CvtHex(RespHash, a2);
if (0 != strcmp(a2, respons)) {
/* digest not ok */
if (p->conf.auth_debug) {
log_error_write(srv, __FILE__, __LINE__, "sss",
"digest: digest mismatch", a2, respons);
}
log_error_write(srv, __FILE__, __LINE__, "ssss",
"digest: auth failed for ", username, ": wrong password, IP:", inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
buffer_free(b);
return 0;
}
/* value is our allow-rules */
if (http_auth_match_rules(srv, req, username, NULL, NULL)) {
buffer_free(b);
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: rules did match");
return 0;
}
/* remember the username */
buffer_copy_string(p->auth_user, username);
buffer_free(b);
if (p->conf.auth_debug) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: auth ok");
}
return 1;
}
int http_auth_digest_generate_nonce(server *srv, mod_auth_plugin_data *p, buffer *fn, char out[33]) {
HASH h;
li_MD5_CTX Md5Ctx;
char hh[LI_ITOSTRING_LENGTH];
UNUSED(p);
/* generate shared-secret */
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(fn));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN("+"));
/* we assume sizeof(time_t) == 4 here, but if not it ain't a problem at all */
li_itostr(hh, srv->cur_ts);
li_MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
li_MD5_Update(&Md5Ctx, (unsigned char *)srv->entropy, sizeof(srv->entropy));
li_itostr(hh, rand());
li_MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
li_MD5_Final(h, &Md5Ctx);
CvtHex(h, out);
return 0;
}