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lighttpd1.4/src/http_auth.c

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#include "config.h"
#ifdef HAVE_CRYPT_H
# include <crypt.h>
#elif defined(__linux__)
/* linux needs _XOPEN_SOURCE */
# define _XOPEN_SOURCE
#endif
#ifdef HAVE_LIBCRYPT
# define HAVE_CRYPT
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include "server.h"
#include "log.h"
#include "http_auth.h"
#include "http_auth_digest.h"
#include "stream.h"
#ifdef USE_OPENSSL
# include <openssl/md5.h>
#else
# include "md5_global.h"
# include "md5.h"
#endif
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/pam_misc.h>
static struct pam_conv conv = {
misc_conv,
NULL
};
#endif
static const char base64_pad = '=';
static const short base64_reverse_table[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
static unsigned char * base64_decode(buffer *out, const char *in) {
unsigned char *result;
int ch, j = 0, k;
size_t i;
size_t in_len = strlen(in);
buffer_prepare_copy(out, in_len);
result = (unsigned char *)out->ptr;
ch = in[0];
/* run through the whole string, converting as we go */
for (i = 0; i < in_len; i++) {
ch = in[i];
if (ch == '\0') break;
if (ch == base64_pad) break;
ch = base64_reverse_table[ch];
if (ch < 0) continue;
switch(i % 4) {
case 0:
result[j] = ch << 2;
break;
case 1:
result[j++] |= ch >> 4;
result[j] = (ch & 0x0f) << 4;
break;
case 2:
result[j++] |= ch >>2;
result[j] = (ch & 0x03) << 6;
break;
case 3:
result[j++] |= ch;
break;
}
}
k = j;
/* mop things up if we ended on a boundary */
if (ch == base64_pad) {
switch(i % 4) {
case 0:
case 1:
return NULL;
case 2:
k++;
case 3:
result[k++] = 0;
}
}
result[k] = '\0';
out->used = k;
return result;
}
static int http_auth_get_password(server *srv, mod_auth_plugin_data *p, buffer *username, buffer *realm, buffer *password) {
int ret = -1;
if (!username->used|| !realm->used) return -1;
if (p->conf.auth_backend == AUTH_BACKEND_HTDIGEST) {
stream f;
char * f_line;
if (buffer_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 (username->used - 1 == u_len &&
(realm->used - 1 == 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_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 (username->used - 1 == 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;
}
static int http_auth_match_rules(server *srv, mod_auth_plugin_data *p, const char *url, const char *username, const char *group, const char *host) {
const char *r = NULL, *rules = NULL;
size_t i;
int username_len;
data_string *require;
array *req;
UNUSED(group);
UNUSED(host);
/* check what has to be match to fullfil the request */
/* search auth-directives for path */
for (i = 0; i < p->conf.auth_require->used; i++) {
if (p->conf.auth_require->data[i]->key->used == 0) continue;
if (0 == strncmp(url, p->conf.auth_require->data[i]->key->ptr, p->conf.auth_require->data[i]->key->used - 1)) {
break;
}
}
if (i == p->conf.auth_require->used) {
return -1;
}
req = ((data_array *)(p->conf.auth_require->data[i]))->value;
require = (data_string *)array_get_element(req, "require");
/* 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 */
/* search for = in the rules */
if (NULL == (eq = strchr(r, '='))) {
log_error_write(srv, __FILE__, __LINE__, "s", "= is missing");
return -1;
}
/* = out of range */
if (eq > r + r_len) {
log_error_write(srv, __FILE__, __LINE__, "s", "= out of range");
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;
}
/**
*
*
* @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)
*/
MD5_CTX Md5Ctx;
HASH HA1;
char a1[256];
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)username->ptr, username->used - 1);
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)realm->ptr, realm->used - 1);
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)pw, strlen(pw));
MD5_Final(HA1, &Md5Ctx);
CvtHex(HA1, a1);
if (0 == strcmp(password->ptr, a1)) {
return 0;
}
} else if (p->conf.auth_backend == AUTH_BACKEND_HTPASSWD) {
#ifdef HAVE_CRYPT
char salt[3];
char *crypted;
/*
* htpasswd format
*
* user:crypted password
*/
salt[0] = password->ptr[0];
salt[1] = password->ptr[1];
salt[2] = '\0';
crypted = crypt(pw, salt);
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_PAM) {
#ifdef USE_PAM
pam_handle_t *pamh=NULL;
int retval;
retval = pam_start("login", username->ptr, &conv, &pamh);
if (retval == PAM_SUCCESS)
retval = pam_authenticate(pamh, 0); /* is user really user? */
if (retval == PAM_SUCCESS)
retval = pam_acct_mgmt(pamh, 0); /* permitted access? */
/* This is where we have been authorized or not. */
if (pam_end(pamh,retval) != PAM_SUCCESS) { /* close Linux-PAM */
pamh = NULL;
log_error_write(srv, __FILE__, __LINE__, "s", "failed to release authenticator");
}
if (retval == PAM_SUCCESS) {
log_error_write(srv, __FILE__, __LINE__, "s", "Authenticated");
return 0;
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "Not Authenticated");
}
#endif
} 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;
/* 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
*/
for (i = 0; i < username->used - 1; i++) {
char c = username->ptr[i];
if (!isalpha(c) &&
!isdigit(c)) {
log_error_write(srv, __FILE__, __LINE__, "sbd",
"ldap: invalid character (a-zA-Z0-9 allowed) in username:", username, i);
return -1;
}
}
/* build filter */
buffer_copy_string_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 (LDAP_SUCCESS != (ret = ldap_search_s(p->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->conf.ldap, lm))) {
log_error_write(srv, __FILE__, __LINE__, "s", "ldap ...");
ldap_msgfree(lm);
return -1;
}
if (NULL == (dn = ldap_get_dn(p->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 (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, buffer *url, const char *realm_str) {
buffer *username, *password;
char *pw;
data_string *realm;
realm = (data_string *)array_get_element(req, "realm");
username = buffer_init();
password = buffer_init();
base64_decode(username, realm_str);
/* r2 == user:password */
if (NULL == (pw = strchr(username->ptr, ':'))) {
buffer_free(username);
log_error_write(srv, __FILE__, __LINE__, "sb", ": is missing in", username);
return 0;
}
*pw++ = '\0';
username->used = pw - username->ptr;
/* copy password to r1 */
if (http_auth_get_password(srv, p, username, realm->value, password)) {
buffer_free(username);
buffer_free(password);
log_error_write(srv, __FILE__, __LINE__, "s", "get_password failed");
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__, "sbb", "password doesn't match", con->uri.path, username);
buffer_free(username);
buffer_free(password);
return 0;
}
/* value is our allow-rules */
if (http_auth_match_rules(srv, p, url->ptr, 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_string_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;
int http_auth_digest_check(server *srv, connection *con, mod_auth_plugin_data *p, array *req, buffer *url, const char *realm_str) {
char a1[256];
char a2[256];
char *username;
char *realm;
char *nonce;
char *uri;
char *algorithm;
char *qop;
char *cnonce;
char *nc;
char *respons;
const char *method_get = "GET";
const char *method_post = "POST";
const char *method_head = "HEAD";
char *e, *c;
const char *m = NULL;
int i;
buffer *password, *b, *username_buf, *realm_buf;
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;
dkv[9].ptr = NULL;
UNUSED(req);
for (i = 0; dkv[i].key; i++) {
*(dkv[i].ptr) = NULL;
}
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++) {
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", "algorigthm", 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");
return -1;
}
switch(con->request.http_method) {
case HTTP_METHOD_GET: m = method_get; break;
case HTTP_METHOD_POST: m = method_post; break;
case HTTP_METHOD_HEAD: m = method_head; break;
case HTTP_METHOD_UNSET: break;
}
/* 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 */
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)username, strlen(username));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)realm, strlen(realm));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)password->ptr, password->used - 1);
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) {
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)HA1, 16);
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)nonce, strlen(nonce));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)cnonce, strlen(cnonce));
MD5_Final(HA1, &Md5Ctx);
}
CvtHex(HA1, a1);
/* calculate H(A2) */
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)m, strlen(m));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)uri, strlen(uri));
if (qop && strcasecmp(qop, "auth-int") == 0) {
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)"", HASHHEXLEN);
}
MD5_Final(HA2, &Md5Ctx);
CvtHex(HA2, HA2Hex);
/* calculate response */
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)a1, HASHHEXLEN);
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)nonce, strlen(nonce));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
if (qop && *qop) {
MD5_Update(&Md5Ctx, (unsigned char *)nc, strlen(nc));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)cnonce, strlen(cnonce));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
MD5_Update(&Md5Ctx, (unsigned char *)qop, strlen(qop));
MD5_Update(&Md5Ctx, (unsigned char *)":", 1);
};
MD5_Update(&Md5Ctx, (unsigned char *)HA2Hex, HASHHEXLEN);
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__, "ssssb",
"digest: digest mismatch", a2, respons);
}
log_error_write(srv, __FILE__, __LINE__, "sss",
"digest: auth failed for", username, "wrong password");
buffer_free(b);
return 0;
}
/* value is our allow-rules */
if (http_auth_match_rules(srv, p, url->ptr, 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;
MD5_CTX Md5Ctx;
char hh[32];
UNUSED(p);
/* generate shared-secret */
MD5_Init(&Md5Ctx);
MD5_Update(&Md5Ctx, (unsigned char *)fn->ptr, fn->used - 1);
MD5_Update(&Md5Ctx, (unsigned char *)"+", 1);
/* we assume sizeof(time_t) == 4 here, but if not it ain't a problem at all */
ltostr(hh, srv->cur_ts);
MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
ltostr(hh, rand());
MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
MD5_Final(h, &Md5Ctx);
CvtHex(h, out);
return 0;
}