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lighttpd1.4/src/mod_auth.c

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#include "first.h"
#include "plugin.h"
#include "http_auth.h"
#include "log.h"
#include "response.h"
#include "inet_ntop_cache.h"
#include "base64.h"
#include "md5.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
/**
* the basic and digest auth framework
*/
typedef struct {
/* auth */
array *auth_require;
buffer *auth_plain_groupfile;
buffer *auth_plain_userfile;
buffer *auth_htdigest_userfile;
buffer *auth_htpasswd_userfile;
buffer *auth_backend_conf;
unsigned short auth_debug;
/* generated */
const http_auth_backend_t *auth_backend;
} mod_auth_plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *tmp_buf;
mod_auth_plugin_config **config_storage;
mod_auth_plugin_config conf;
} mod_auth_plugin_data;
INIT_FUNC(mod_auth_init) {
mod_auth_plugin_data *p;
p = calloc(1, sizeof(*p));
p->tmp_buf = buffer_init();
return p;
}
FREE_FUNC(mod_auth_free) {
mod_auth_plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
buffer_free(p->tmp_buf);
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
mod_auth_plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
array_free(s->auth_require);
buffer_free(s->auth_backend_conf);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_auth_patch_connection(server *srv, connection *con, mod_auth_plugin_data *p) {
size_t i, j;
mod_auth_plugin_config *s = p->config_storage[0];
PATCH(auth_backend);
PATCH(auth_require);
PATCH(auth_debug);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend"))) {
PATCH(auth_backend);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.require"))) {
PATCH(auth_require);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.debug"))) {
PATCH(auth_debug);
}
}
}
return 0;
}
#undef PATCH
static int mod_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 (!require) return -1; /*(should not happen; config is validated at startup)*/
/* 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;
}
static handler_t mod_auth_send_400_bad_request(server *srv, connection *con) {
UNUSED(srv);
/* a field was missing or invalid */
con->http_status = 400; /* Bad Request */
con->mode = DIRECT;
return HANDLER_FINISHED;
}
static int mod_auth_digest_generate_nonce(server *srv, mod_auth_plugin_data *p, buffer *fn, char (*out)[33]);
static handler_t mod_auth_send_401_unauthorized_basic(server *srv, connection *con, mod_auth_plugin_data *p, array *req) {
data_string *realm = (data_string *)array_get_element(req, "realm");
con->http_status = 401;
con->mode = DIRECT;
if (!realm) return HANDLER_FINISHED; /*(should not happen; config is validated at startup)*/
buffer_copy_string_len(p->tmp_buf, CONST_STR_LEN("Basic realm=\""));
buffer_append_string_buffer(p->tmp_buf, realm->value);
buffer_append_string_len(p->tmp_buf, CONST_STR_LEN("\", charset=\"UTF-8\""));
response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(p->tmp_buf));
return HANDLER_FINISHED;
}
static handler_t mod_auth_send_401_unauthorized_digest(server *srv, connection *con, mod_auth_plugin_data *p, array *req, int nonce_stale) {
data_string *realm = (data_string *)array_get_element(req, "realm");
char hh[33];
con->http_status = 401;
con->mode = DIRECT;
if (!realm) return HANDLER_FINISHED; /*(should not happen; config is validated at startup)*/
/* using unknown contents of srv->tmp_buf (modified elsewhere)
* adds dubious amount of randomness. Remove use of srv->tmp_buf? */
mod_auth_digest_generate_nonce(srv, p, srv->tmp_buf, &hh);
buffer_copy_string_len(p->tmp_buf, CONST_STR_LEN("Digest realm=\""));
buffer_append_string_buffer(p->tmp_buf, realm->value);
buffer_append_string_len(p->tmp_buf, CONST_STR_LEN("\", charset=\"UTF-8\", nonce=\""));
buffer_append_uint_hex(p->tmp_buf, (uintmax_t)srv->cur_ts);
buffer_append_string_len(p->tmp_buf, CONST_STR_LEN(":"));
buffer_append_string(p->tmp_buf, hh);
buffer_append_string_len(p->tmp_buf, CONST_STR_LEN("\", qop=\"auth\""));
if (nonce_stale) {
buffer_append_string_len(p->tmp_buf, CONST_STR_LEN(", stale=true"));
}
response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(p->tmp_buf));
return HANDLER_FINISHED;
}
static void mod_auth_setenv(server *srv, connection *con, const char *username, size_t ulen, const char *auth_type, size_t alen) {
data_string *ds;
UNUSED(srv);
/* the REMOTE_USER header */
if (NULL == (ds = (data_string *)array_get_element(con->environment, "REMOTE_USER"))) {
if (NULL == (ds = (data_string *)array_get_unused_element(con->environment, TYPE_STRING))) {
ds = data_string_init();
}
buffer_copy_string_len(ds->key, CONST_STR_LEN("REMOTE_USER"));
array_insert_unique(con->environment, (data_unset *)ds);
}
buffer_copy_string_len(ds->value, username, ulen);
/* AUTH_TYPE environment */
if (NULL == (ds = (data_string *)array_get_element(con->environment, "AUTH_TYPE"))) {
if (NULL == (ds = (data_string *)array_get_unused_element(con->environment, TYPE_STRING))) {
ds = data_string_init();
}
buffer_copy_string_len(ds->key, CONST_STR_LEN("AUTH_TYPE"));
array_insert_unique(con->environment, (data_unset *)ds);
}
buffer_copy_string_len(ds->value, auth_type, alen);
}
static handler_t mod_auth_basic_check(server *srv, connection *con, mod_auth_plugin_data *p, array *req, const char *realm_str) {
buffer *username;
char *pw;
data_string *realm;
realm = (data_string *)array_get_element(req, "realm");
if (!realm) { /*(should not happen; config is validated at startup)*/
return mod_auth_send_400_bad_request(srv, con);
}
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 mod_auth_send_400_bad_request(srv, con);
}
/* r2 == user:password */
if (NULL == (pw = strchr(username->ptr, ':'))) {
log_error_write(srv, __FILE__, __LINE__, "sb", ": is missing in", username);
buffer_free(username);
return mod_auth_send_400_bad_request(srv, con);
}
buffer_string_set_length(username, pw - username->ptr);
pw++;
switch (p->conf.auth_backend->basic(srv, con, p->conf.auth_backend->p_d, username, realm->value, pw)) {
case HANDLER_GO_ON:
break;
case HANDLER_WAIT_FOR_EVENT:
buffer_free(username);
return HANDLER_WAIT_FOR_EVENT;
case HANDLER_FINISHED:
buffer_free(username);
return HANDLER_FINISHED;
case HANDLER_ERROR:
default:
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);
return mod_auth_send_401_unauthorized_basic(srv, con, p, req);
}
/* value is our allow-rules */
if (mod_auth_match_rules(srv, req, username->ptr, NULL, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "s", "rules didn't match");
buffer_free(username);
return mod_auth_send_401_unauthorized_basic(srv, con, p, req);
}
mod_auth_setenv(srv, con, CONST_BUF_LEN(username), CONST_STR_LEN("Basic"));
buffer_free(username);
return HANDLER_GO_ON;
}
#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, sizeof(*Hex), (const char*) Bin, 16);
}
typedef struct {
const char *key;
int key_len;
char **ptr;
} digest_kv;
static handler_t mod_auth_digest_check(server *srv, connection *con, mod_auth_plugin_data *p, array *req, const char *realm_str) {
char a1[33];
char a2[33];
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 *b;
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;
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;
}
break;
}
}
}
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 mod_auth_send_400_bad_request(srv, con);
}
/**
* 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 mod_auth_send_400_bad_request(srv, con);
}
if (qop && strcasecmp(qop, "auth-int") == 0) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: qop=auth-int not supported");
buffer_free(b);
return mod_auth_send_400_bad_request(srv, con);
}
m = get_http_method_name(con->request.http_method);
force_assert(m);
/* detect if attacker is attempting to reuse valid digest for one uri
* on a different request uri. Might also happen if intermediate proxy
* altered client request line. (Altered request would not result in
* the same digest as that calculated by the client.)
* Internal redirects such as with mod_rewrite will modify request uri.
* Reauthentication is done to detect crossing auth realms, but this
* uri validation step is bypassed. con->request.orig_uri is original
* uri sent in client request. */
{
const size_t ulen = strlen(uri);
const size_t rlen = buffer_string_length(con->request.orig_uri);
if (!buffer_is_equal_string(con->request.orig_uri, uri, ulen)
&& !(rlen < ulen && 0 == memcmp(con->request.orig_uri->ptr, uri, rlen) && uri[rlen] == '?')) {
log_error_write(srv, __FILE__, __LINE__, "sbssss",
"digest: auth failed: uri mismatch (", con->request.orig_uri, "!=", uri, "), IP:", inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
buffer_free(b);
return mod_auth_send_400_bad_request(srv, con);
}
}
/* password-string == HA1 */
switch (p->conf.auth_backend->digest(srv, con, p->conf.auth_backend->p_d, username, realm, HA1)) {
case HANDLER_GO_ON:
break;
case HANDLER_WAIT_FOR_EVENT:
buffer_free(b);
return HANDLER_WAIT_FOR_EVENT;
case HANDLER_FINISHED:
buffer_free(b);
return HANDLER_FINISHED;
case HANDLER_ERROR:
default:
buffer_free(b);
return mod_auth_send_401_unauthorized_digest(srv, con, p, req, 0);
}
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, HASHHEXLEN);
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 mod_auth_send_401_unauthorized_digest(srv, con, p, req, 0);
}
/* value is our allow-rules */
if (mod_auth_match_rules(srv, req, username, NULL, NULL)) {
if (p->conf.auth_debug) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: rules did match");
}
buffer_free(b);
return mod_auth_send_401_unauthorized_digest(srv, con, p, req, 0);
}
/* check age of nonce. Note that rand() is used in nonce generation
* in mod_auth_digest_generate_nonce(). If that were replaced
* with nanosecond time, then nonce secret would remain unique enough
* for the purposes of Digest auth, and would be reproducible (and
* verifiable) if nanoseconds were inclued with seconds as part of the
* nonce "timestamp:secret". Since that is not done, timestamp in
* nonce could theoretically be modified and still produce same md5sum,
* but that is highly unlikely within a 10 min (moving) window of valid
* time relative to current time (now) */
{
time_t ts = 0;
const unsigned char * const nonce_uns = (unsigned char *)nonce;
for (i = 0; i < 8 && light_isxdigit(nonce_uns[i]); ++i) {
ts = (ts << 4) + hex2int(nonce_uns[i]);
}
if (i != 8 || nonce[8] != ':'
|| ts > srv->cur_ts || srv->cur_ts - ts > 600) { /*(10 mins)*/
/* nonce is stale; have client regenerate digest */
buffer_free(b);
return mod_auth_send_401_unauthorized_digest(srv, con, p, req, 1);
} /*(future: might send nextnonce when expiration is imminent)*/
}
mod_auth_setenv(srv, con, username, strlen(username), CONST_STR_LEN("Digest"));
buffer_free(b);
if (p->conf.auth_debug) {
log_error_write(srv, __FILE__, __LINE__, "s",
"digest: auth ok");
}
return HANDLER_GO_ON;
}
static int mod_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_itostrn(hh, sizeof(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_itostrn(hh, sizeof(hh), rand());
li_MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
li_MD5_Final(h, &Md5Ctx);
CvtHex(h, out);
return 0;
}
static handler_t mod_auth_uri_handler(server *srv, connection *con, void *p_d) {
size_t k;
int auth_required;
char *http_authorization = NULL;
data_string *ds;
mod_auth_plugin_data *p = p_d;
array *req;
data_string *req_method;
/* select the right config */
mod_auth_patch_connection(srv, con, p);
if (p->conf.auth_require == NULL) return HANDLER_GO_ON;
/*
* AUTH
*
*/
/* do we have to ask for auth ? */
auth_required = 0;
/* search auth-directives for path */
for (k = 0; k < p->conf.auth_require->used; k++) {
buffer *require = p->conf.auth_require->data[k]->key;
if (buffer_is_empty(require)) continue;
if (buffer_string_length(con->uri.path) < buffer_string_length(require)) continue;
/* if we have a case-insensitive FS we have to lower-case the URI here too */
if (con->conf.force_lowercase_filenames) {
if (0 == strncasecmp(con->uri.path->ptr, require->ptr, buffer_string_length(require))) {
auth_required = 1;
break;
}
} else {
if (0 == strncmp(con->uri.path->ptr, require->ptr, buffer_string_length(require))) {
auth_required = 1;
break;
}
}
}
/* nothing to do for us */
if (auth_required == 0) return HANDLER_GO_ON;
req = ((data_array *)(p->conf.auth_require->data[k]))->value;
req_method = (data_string *)array_get_element(req, "method");
if (0 == strcmp(req_method->value->ptr, "extern")) {
/* require REMOTE_USER to be already set */
if (NULL == (ds = (data_string *)array_get_element(con->environment, "REMOTE_USER"))) {
con->http_status = 401;
con->mode = DIRECT;
return HANDLER_FINISHED;
} else if (mod_auth_match_rules(srv, req, ds->value->ptr, NULL, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "s", "rules didn't match");
con->http_status = 401;
con->mode = DIRECT;
return HANDLER_FINISHED;
} else {
return HANDLER_GO_ON;
}
}
/* check for configured backend
* (XXX: should try to catch this at config time, if not "extern" method) */
if (NULL == p->conf.auth_backend) {
log_error_write(srv, __FILE__, __LINE__, "sb", "auth.backend not configured for", con->uri.path);
con->http_status = 500;
con->mode = DIRECT;
return HANDLER_FINISHED;
}
/* try to get Authorization-header */
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, "Authorization")) && !buffer_is_empty(ds->value)) {
char *auth_realm;
http_authorization = ds->value->ptr;
/* parse auth-header */
if (NULL != (auth_realm = strchr(http_authorization, ' '))) {
int auth_type_len = auth_realm - http_authorization;
if ((auth_type_len == 5) &&
(0 == strncasecmp(http_authorization, "Basic", auth_type_len))) {
if (0 == strcmp(req_method->value->ptr, "basic")) {
return mod_auth_basic_check(srv, con, p, req, auth_realm+1);
}
} else if ((auth_type_len == 6) &&
(0 == strncasecmp(http_authorization, "Digest", auth_type_len))) {
if (0 == strcmp(req_method->value->ptr, "digest")) {
return mod_auth_digest_check(srv, con, p, req, auth_realm+1);
}
} else {
log_error_write(srv, __FILE__, __LINE__, "ss",
"unknown authentication type:",
http_authorization);
return mod_auth_send_400_bad_request(srv, con);
}
} else {
return mod_auth_send_400_bad_request(srv, con);
}
}
if (0 == strcmp(req_method->value->ptr, "basic")) {
return mod_auth_send_401_unauthorized_basic(srv, con, p, req);
} else if (0 == strcmp(req_method->value->ptr, "digest")) {
return mod_auth_send_401_unauthorized_digest(srv, con, p, req, 0);
} else {
/* evil */
con->http_status = 401;
con->mode = DIRECT;
return HANDLER_FINISHED;
}
}
SETDEFAULTS_FUNC(mod_auth_set_defaults) {
mod_auth_plugin_data *p = p_d;
size_t i;
config_values_t cv[] = {
{ "auth.backend", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "auth.require", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ "auth.debug", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
p->config_storage = calloc(1, srv->config_context->used * sizeof(mod_auth_plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
mod_auth_plugin_config *s;
size_t n;
data_array *da;
s = calloc(1, sizeof(mod_auth_plugin_config));
s->auth_backend_conf = buffer_init();
s->auth_debug = 0;
s->auth_require = array_init();
cv[0].destination = s->auth_backend_conf;
cv[1].destination = s->auth_require;
cv[2].destination = &(s->auth_debug);
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
if (!buffer_string_is_empty(s->auth_backend_conf)) {
s->auth_backend = http_auth_backend_get(s->auth_backend_conf);
if (NULL == s->auth_backend) {
log_error_write(srv, __FILE__, __LINE__, "sb", "auth.backend not supported:", s->auth_backend_conf);
return HANDLER_ERROR;
}
}
/* no auth.require for this section */
if (NULL == (da = (data_array *)array_get_element(config->value, "auth.require"))) continue;
if (da->type != TYPE_ARRAY) continue;
for (n = 0; n < da->value->used; n++) {
size_t m;
data_array *da_file = (data_array *)da->value->data[n];
const char *method, *realm, *require;
if (da->value->data[n]->type != TYPE_ARRAY) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"auth.require should contain an array as in:",
"auth.require = ( \"...\" => ( ..., ...) )");
return HANDLER_ERROR;
}
method = realm = require = NULL;
for (m = 0; m < da_file->value->used; m++) {
if (da_file->value->data[m]->type == TYPE_STRING) {
if (0 == strcmp(da_file->value->data[m]->key->ptr, "method")) {
method = ((data_string *)(da_file->value->data[m]))->value->ptr;
} else if (0 == strcmp(da_file->value->data[m]->key->ptr, "realm")) {
realm = ((data_string *)(da_file->value->data[m]))->value->ptr;
} else if (0 == strcmp(da_file->value->data[m]->key->ptr, "require")) {
require = ((data_string *)(da_file->value->data[m]))->value->ptr;
} else {
log_error_write(srv, __FILE__, __LINE__, "ssbs",
"the field is unknown in:",
"auth.require = ( \"...\" => ( ..., -> \"",
da_file->value->data[m]->key,
"\" <- => \"...\" ) )");
return HANDLER_ERROR;
}
} else {
log_error_write(srv, __FILE__, __LINE__, "ssbs",
"a string was expected for:",
"auth.require = ( \"...\" => ( ..., -> \"",
da_file->value->data[m]->key,
"\" <- => \"...\" ) )");
return HANDLER_ERROR;
}
}
if (method == NULL) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"the method field is missing in:",
"auth.require = ( \"...\" => ( ..., \"method\" => \"...\" ) )");
return HANDLER_ERROR;
} else {
if (0 != strcmp(method, "basic") &&
0 != strcmp(method, "digest") &&
0 != strcmp(method, "extern")) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"method has to be either \"basic\", \"digest\" or \"extern\" in",
"auth.require = ( \"...\" => ( ..., \"method\" => \"...\") )");
return HANDLER_ERROR;
}
}
if (realm == NULL) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"the realm field is missing in:",
"auth.require = ( \"...\" => ( ..., \"realm\" => \"...\" ) )");
return HANDLER_ERROR;
}
if (require == NULL) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"the require field is missing in:",
"auth.require = ( \"...\" => ( ..., \"require\" => \"...\" ) )");
return HANDLER_ERROR;
}
if (method && realm && require) {
data_string *ds;
data_array *a;
a = data_array_init();
buffer_copy_buffer(a->key, da_file->key);
ds = data_string_init();
buffer_copy_string_len(ds->key, CONST_STR_LEN("method"));
buffer_copy_string(ds->value, method);
array_insert_unique(a->value, (data_unset *)ds);
ds = data_string_init();
buffer_copy_string_len(ds->key, CONST_STR_LEN("realm"));
buffer_copy_string(ds->value, realm);
array_insert_unique(a->value, (data_unset *)ds);
ds = data_string_init();
buffer_copy_string_len(ds->key, CONST_STR_LEN("require"));
buffer_copy_string(ds->value, require);
array_insert_unique(a->value, (data_unset *)ds);
array_insert_unique(s->auth_require, (data_unset *)a);
}
}
}
return HANDLER_GO_ON;
}
int mod_auth_plugin_init(plugin *p);
int mod_auth_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("auth");
p->init = mod_auth_init;
p->set_defaults = mod_auth_set_defaults;
p->handle_uri_clean = mod_auth_uri_handler;
p->cleanup = mod_auth_free;
p->data = NULL;
return 0;
}
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