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lighttpd1.4/src/mod_auth.c

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#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "plugin.h"
#include "http_auth.h"
#include "log.h"
#include "response.h"
/**
* the basic and digest auth framework
*
* - config handling
* - protocol handling
*
* http_auth.c
* http_auth_digest.c
*
* do the real work
*/
INIT_FUNC(mod_auth_init) {
mod_auth_plugin_data *p;
p = calloc(1, sizeof(*p));
p->tmp_buf = buffer_init();
p->auth_user = buffer_init();
#ifdef USE_LDAP
p->ldap_filter = buffer_init();
#endif
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);
buffer_free(p->auth_user);
#ifdef USE_LDAP
buffer_free(p->ldap_filter);
#endif
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];
array_free(s->auth_require);
buffer_free(s->auth_plain_groupfile);
buffer_free(s->auth_plain_userfile);
buffer_free(s->auth_htdigest_userfile);
buffer_free(s->auth_htpasswd_userfile);
buffer_free(s->auth_backend_conf);
buffer_free(s->auth_ldap_hostname);
buffer_free(s->auth_ldap_basedn);
buffer_free(s->auth_ldap_filter);
#ifdef USE_LDAP
buffer_free(s->ldap_filter_pre);
buffer_free(s->ldap_filter_post);
if (s->ldap) ldap_unbind_s(s->ldap);
#endif
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, const char *stage, size_t stage_len) {
size_t i, j;
/* 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];
mod_auth_plugin_config *s = p->config_storage[i];
/* not our stage */
if (!buffer_is_equal_string(dc->comp_key, stage, stage_len)) continue;
/* 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.backend.plain.groupfile"))) {
PATCH(auth_plain_groupfile);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.plain.userfile"))) {
PATCH(auth_plain_userfile);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.htdigest.userfile"))) {
PATCH(auth_htdigest_userfile);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.htpasswd.userfile"))) {
PATCH(auth_htpasswd_userfile);
} 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);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.ldap.hostname"))) {
PATCH(auth_ldap_hostname);
#ifdef USE_LDAP
PATCH(ldap);
PATCH(ldap_filter_pre);
PATCH(ldap_filter_post);
#endif
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.ldap.base-dn"))) {
PATCH(auth_ldap_basedn);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("auth.backend.ldap.filter"))) {
PATCH(auth_ldap_filter);
}
}
}
return 0;
}
static int mod_auth_setup_connection(server *srv, connection *con, mod_auth_plugin_data *p) {
mod_auth_plugin_config *s = p->config_storage[0];
UNUSED(srv);
UNUSED(con);
PATCH(auth_backend);
PATCH(auth_plain_groupfile);
PATCH(auth_plain_userfile);
PATCH(auth_htdigest_userfile);
PATCH(auth_htpasswd_userfile);
PATCH(auth_require);
PATCH(auth_debug);
PATCH(auth_ldap_hostname);
PATCH(auth_ldap_basedn);
PATCH(auth_ldap_filter);
#ifdef USE_LDAP
PATCH(ldap);
PATCH(ldap_filter_pre);
PATCH(ldap_filter_post);
#endif
return 0;
}
#undef PATCH
static handler_t mod_auth_uri_handler(server *srv, connection *con, void *p_d) {
size_t k;
int auth_required = 0, auth_satisfied = 0;
char *http_authorization = NULL;
data_string *ds;
mod_auth_plugin_data *p = p_d;
array *req;
size_t i;
/* select the right config */
mod_auth_setup_connection(srv, con, p);
for (i = 0; i < srv->config_patches->used; i++) {
buffer *patch = srv->config_patches->ptr[i];
mod_auth_patch_connection(srv, con, p, CONST_BUF_LEN(patch));
}
if (p->conf.auth_require == NULL) return HANDLER_GO_ON;
/*
* AUTH
*
*/
/* do we have to ask for auth ? */
auth_required = 0;
auth_satisfied = 0;
/* search auth-directives for path */
for (k = 0; k < p->conf.auth_require->used; k++) {
if (p->conf.auth_require->data[k]->key->used == 0) continue;
if (0 == strncmp(con->uri.path->ptr, p->conf.auth_require->data[k]->key->ptr, p->conf.auth_require->data[k]->key->used - 1)) {
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;
/* try to get Authorization-header */
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, "Authorization"))) {
http_authorization = ds->value->ptr;
}
if (ds && ds->value && ds->value->used) {
char *auth_realm;
data_string *method;
method = (data_string *)array_get_element(req, "method");
/* parse auth-header */
if (NULL != (auth_realm = strchr(http_authorization, ' '))) {
int auth_type_len = auth_realm - http_authorization;
if ((auth_type_len == 5) &&
(0 == strncmp(http_authorization, "Basic", auth_type_len))) {
if (0 == strcmp(method->value->ptr, "basic")) {
auth_satisfied = http_auth_basic_check(srv, con, p, req, con->uri.path, auth_realm+1);
}
} else if ((auth_type_len == 6) &&
(0 == strncmp(http_authorization, "Digest", auth_type_len))) {
if (0 == strcmp(method->value->ptr, "digest")) {
if (-1 == (auth_satisfied = http_auth_digest_check(srv, con, p, req, con->uri.path, auth_realm+1))) {
con->http_status = 400;
/* a field was missing */
return HANDLER_FINISHED;
}
}
} else {
log_error_write(srv, __FILE__, __LINE__, "ss",
"unknown authentification type:",
http_authorization);
}
}
}
if (!auth_satisfied) {
data_string *method, *realm;
method = (data_string *)array_get_element(req, "method");
realm = (data_string *)array_get_element(req, "realm");
con->http_status = 401;
if (0 == strcmp(method->value->ptr, "basic")) {
buffer_copy_string(p->tmp_buf, "Basic realm=\"");
buffer_append_string_buffer(p->tmp_buf, realm->value);
buffer_append_string(p->tmp_buf, "\"");
response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(p->tmp_buf));
} else if (0 == strcmp(method->value->ptr, "digest")) {
char hh[33];
http_auth_digest_generate_nonce(srv, p, srv->tmp_buf, hh);
buffer_copy_string(p->tmp_buf, "Digest realm=\"");
buffer_append_string_buffer(p->tmp_buf, realm->value);
buffer_append_string(p->tmp_buf, "\", nonce=\"");
buffer_append_string(p->tmp_buf, hh);
buffer_append_string(p->tmp_buf, "\", qop=\"auth\"");
response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(p->tmp_buf));
} else {
/* evil */
}
return HANDLER_FINISHED;
} else {
/* the REMOTE_USER header */
buffer_copy_string_buffer(con->authed_user, p->auth_user);
}
return HANDLER_GO_ON;
}
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.backend.plain.groupfile", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.plain.userfile", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.require", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.ldap.hostname", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.ldap.base-dn", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.ldap.filter", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.htdigest.userfile", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.backend.htpasswd.userfile", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ "auth.debug", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 9 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
p->config_storage = malloc(srv->config_context->used * sizeof(specific_config *));
for (i = 0; i < srv->config_context->used; i++) {
mod_auth_plugin_config *s;
size_t n;
data_array *da;
array *ca;
s = malloc(sizeof(mod_auth_plugin_config));
s->auth_plain_groupfile = buffer_init();
s->auth_plain_userfile = buffer_init();
s->auth_htdigest_userfile = buffer_init();
s->auth_htpasswd_userfile = buffer_init();
s->auth_backend_conf = buffer_init();
s->auth_ldap_hostname = buffer_init();
s->auth_ldap_basedn = buffer_init();
s->auth_ldap_filter = buffer_init();
s->auth_debug = 0;
s->auth_require = array_init();
#ifdef USE_LDAP
s->ldap_filter_pre = buffer_init();
s->ldap_filter_post = buffer_init();
s->ldap = NULL;
#endif
cv[0].destination = s->auth_backend_conf;
cv[1].destination = s->auth_plain_groupfile;
cv[2].destination = s->auth_plain_userfile;
cv[3].destination = s->auth_require;
cv[4].destination = s->auth_ldap_hostname;
cv[5].destination = s->auth_ldap_basedn;
cv[6].destination = s->auth_ldap_filter;
cv[7].destination = s->auth_htdigest_userfile;
cv[8].destination = s->auth_htpasswd_userfile;
cv[9].destination = &(s->auth_debug);
p->config_storage[i] = s;
ca = ((data_config *)srv->config_context->data[i])->value;
if (0 != config_insert_values_global(srv, ca, cv)) {
return HANDLER_ERROR;
}
if (s->auth_backend_conf->used) {
if (0 == strcmp(s->auth_backend_conf->ptr, "htpasswd")) {
s->auth_backend = AUTH_BACKEND_HTPASSWD;
} else if (0 == strcmp(s->auth_backend_conf->ptr, "htdigest")) {
s->auth_backend = AUTH_BACKEND_HTDIGEST;
} else if (0 == strcmp(s->auth_backend_conf->ptr, "plain")) {
s->auth_backend = AUTH_BACKEND_PLAIN;
} else if (0 == strcmp(s->auth_backend_conf->ptr, "ldap")) {
s->auth_backend = AUTH_BACKEND_LDAP;
} else {
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(ca, "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__, "sssbs",
"unexpected type for key: ", "auth.require", "[", da->value->data[n]->key, "](string)");
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__, "sssbs", "unexpected type for key: ", "auth.require", "[", da_file->value->data[m]->key, "](string)");
return HANDLER_ERROR;
}
} else {
log_error_write(srv, __FILE__, __LINE__, "sssbs", "unexpected type for key: ", "auth.require", "[", da_file->value->data[m]->key, "](string)");
return HANDLER_ERROR;
}
}
if (method == NULL) {
log_error_write(srv, __FILE__, __LINE__, "sssss", "missing entry for key: ", "auth.require", "[", "method", "](string)");
return HANDLER_ERROR;
}
if (realm == NULL) {
log_error_write(srv, __FILE__, __LINE__, "sssss", "missing entry for key: ", "auth.require", "[", "realm", "](string)");
return HANDLER_ERROR;
}
if (require == NULL) {
log_error_write(srv, __FILE__, __LINE__, "sssss", "missing entry for key: ", "auth.require", "[", "require", "](string)");
return HANDLER_ERROR;
}
if (method && realm && require) {
data_string *ds;
data_array *a;
a = data_array_init();
buffer_copy_string_buffer(a->key, da_file->key);
ds = data_string_init();
buffer_copy_string(ds->key, "method");
buffer_copy_string(ds->value, method);
array_insert_unique(a->value, (data_unset *)ds);
ds = data_string_init();
buffer_copy_string(ds->key, "realm");
buffer_copy_string(ds->value, realm);
array_insert_unique(a->value, (data_unset *)ds);
ds = data_string_init();
buffer_copy_string(ds->key, "require");
buffer_copy_string(ds->value, require);
array_insert_unique(a->value, (data_unset *)ds);
array_insert_unique(s->auth_require, (data_unset *)a);
}
}
switch(s->auth_backend) {
case AUTH_BACKEND_PLAIN:
if (s->auth_plain_userfile->used) {
int fd;
/* try to read */
if (-1 == (fd = open(s->auth_plain_userfile->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"opening auth.backend.plain.userfile:", s->auth_plain_userfile,
"failed:", strerror(errno));
return HANDLER_ERROR;
}
close(fd);
}
break;
case AUTH_BACKEND_HTPASSWD:
if (s->auth_htpasswd_userfile->used) {
int fd;
/* try to read */
if (-1 == (fd = open(s->auth_htpasswd_userfile->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"opening auth.backend.htpasswd.userfile:", s->auth_htpasswd_userfile,
"failed:", strerror(errno));
return HANDLER_ERROR;
}
close(fd);
}
break;
case AUTH_BACKEND_HTDIGEST:
if (s->auth_htdigest_userfile->used) {
int fd;
/* try to read */
if (-1 == (fd = open(s->auth_htdigest_userfile->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"opening auth.backend.htdigest.userfile:", s->auth_htdigest_userfile,
"failed:", strerror(errno));
return HANDLER_ERROR;
}
close(fd);
}
break;
case AUTH_BACKEND_LDAP:
#ifdef USE_LDAP
#if 0
if (s->auth_ldap_basedn->used == 0) {
log_error_write(srv, __FILE__, __LINE__, "s", "ldap: auth.backend.ldap.base-dn has to be set");
return HANDLER_ERROR;
}
#endif
if (s->auth_ldap_filter->used) {
char *dollar;
/* parse filter */
if (NULL == (dollar = strchr(s->auth_ldap_filter->ptr, '$'))) {
log_error_write(srv, __FILE__, __LINE__, "s", "ldap: auth.backend.ldap.filter is missing a replace-operator '$'");
return HANDLER_ERROR;
}
buffer_copy_string_len(s->ldap_filter_pre, s->auth_ldap_filter->ptr, dollar - s->auth_ldap_filter->ptr);
buffer_copy_string(s->ldap_filter_post, dollar+1);
}
if (s->auth_ldap_hostname->used) {
int ret;
if (NULL == (s->ldap = ldap_init(s->auth_ldap_hostname->ptr, LDAP_PORT))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap ...", strerror(errno));
return HANDLER_ERROR;
}
ret = LDAP_VERSION3;
if (LDAP_OPT_SUCCESS != (ret = ldap_set_option(s->ldap, LDAP_OPT_PROTOCOL_VERSION, &ret))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap:", ldap_err2string(ret));
return HANDLER_ERROR;
}
/* 1. */
if (LDAP_SUCCESS != (ret = ldap_simple_bind_s(s->ldap, NULL, NULL))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "ldap:", ldap_err2string(ret));
return HANDLER_ERROR;
}
}
#else
log_error_write(srv, __FILE__, __LINE__, "s", "no ldap support available");
return HANDLER_ERROR;
#endif
break;
default:
break;
}
}
return HANDLER_GO_ON;
}
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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