mail-storage-service.c revision 0992011130e9d0a498ca860ddbe4028398a530c5
0N/A/* Copyright (c) 2009-2011 Dovecot authors, see the included COPYING file */
0N/A
0N/A#include "lib.h"
0N/A#include "ioloop.h"
0N/A#include "array.h"
0N/A#include "hostpid.h"
0N/A#include "module-dir.h"
0N/A#include "restrict-access.h"
0N/A#include "eacces-error.h"
0N/A#include "ipwd.h"
0N/A#include "str.h"
0N/A#include "var-expand.h"
0N/A#include "dict.h"
0N/A#include "settings-parser.h"
0N/A#include "auth-master.h"
0N/A#include "master-service-private.h"
0N/A#include "master-service-settings.h"
0N/A#include "master-service-settings-cache.h"
0N/A#include "mail-user.h"
0N/A#include "mail-namespace.h"
0N/A#include "mail-storage.h"
0N/A#include "mail-storage-service.h"
0N/A
0N/A#include <stdlib.h>
0N/A#include <sys/stat.h>
0N/A
0N/A#ifdef HAVE_SYS_TIME_H
0N/A# include <sys/time.h>
0N/A#endif
0N/A#ifdef HAVE_SYS_RESOURCE_H
0N/A# include <sys/resource.h>
0N/A#endif
0N/A
0N/A/* If time moves backwards more than this, kill ourself instead of sleeping. */
0N/A#define MAX_TIME_BACKWARDS_SLEEP 5
0N/A#define MAX_NOWARN_FORWARD_SECS 10
0N/A
0N/A#define ERRSTR_INVALID_USER_SETTINGS \
0N/A "Invalid user settings. Refer to server log for more information."
0N/A
0N/Astruct mail_storage_service_ctx {
0N/A pool_t pool;
0N/A struct master_service *service;
0N/A struct auth_master_connection *conn;
0N/A struct auth_master_user_list_ctx *auth_list;
0N/A const struct setting_parser_info **set_roots;
0N/A enum mail_storage_service_flags flags;
0N/A
0N/A const char *set_cache_module, *set_cache_service;
0N/A struct master_service_settings_cache *set_cache;
0N/A
0N/A unsigned int debug:1;
0N/A unsigned int log_initialized:1;
0N/A};
0N/A
0N/Astruct mail_storage_service_user {
0N/A pool_t pool;
0N/A struct mail_storage_service_input input;
0N/A
0N/A const char *system_groups_user, *uid_source, *gid_source;
0N/A const struct mail_user_settings *user_set;
0N/A const struct setting_parser_info *user_info;
0N/A struct setting_parser_context *set_parser;
0N/A};
0N/A
0N/Astruct module *mail_storage_service_modules = NULL;
0N/A
0N/Astatic bool
0N/Amail_user_set_get_mail_debug(const struct setting_parser_info *user_info,
0N/A const struct mail_user_settings *user_set)
0N/A{
0N/A const struct mail_storage_settings *mail_set;
0N/A
0N/A mail_set = mail_user_set_get_driver_settings(user_info, user_set,
0N/A MAIL_STORAGE_SET_DRIVER_NAME);
0N/A return mail_set->mail_debug;
0N/A}
0N/A
0N/Astatic void set_keyval(struct mail_storage_service_ctx *ctx,
0N/A struct mail_storage_service_user *user,
0N/A const char *key, const char *value)
0N/A{
0N/A struct setting_parser_context *set_parser = user->set_parser;
0N/A const char *str;
0N/A
0N/A if (master_service_set_has_config_override(ctx->service, key)) {
0N/A /* this setting was already overridden with -o parameter */
0N/A if (mail_user_set_get_mail_debug(user->user_info,
0N/A user->user_set)) {
0N/A i_debug("Ignoring overridden (-o) userdb setting: %s",
0N/A key);
0N/A }
0N/A return;
0N/A }
0N/A
0N/A str = t_strconcat(key, "=", value, NULL);
0N/A if (settings_parse_line(set_parser, str) < 0) {
0N/A i_fatal("Invalid userdb input '%s': %s", str,
0N/A settings_parser_get_error(set_parser));
0N/A }
0N/A}
0N/A
0N/Astatic int set_line(struct mail_storage_service_ctx *ctx,
0N/A struct mail_storage_service_user *user,
0N/A const char *line)
0N/A{
0N/A struct setting_parser_context *set_parser = user->set_parser;
0N/A bool mail_debug;
0N/A const char *key;
0N/A int ret;
0N/A
0N/A mail_debug = mail_user_set_get_mail_debug(user->user_info,
0N/A user->user_set);
0N/A if (strchr(line, '=') == NULL)
0N/A line = t_strconcat(line, "=yes", NULL);
0N/A key = t_strcut(line, '=');
0N/A
0N/A if (!settings_parse_is_valid_key(set_parser, key)) {
0N/A /* assume it's a plugin setting */
0N/A key = t_strconcat("plugin/", key, NULL);
0N/A line = t_strconcat("plugin/", line, NULL);
0N/A }
0N/A
0N/A if (master_service_set_has_config_override(ctx->service, key)) {
0N/A /* this setting was already overridden with -o parameter */
0N/A if (mail_debug) {
0N/A i_debug("Ignoring overridden (-o) userdb setting: %s",
0N/A key);
0N/A }
0N/A return 1;
0N/A }
0N/A
0N/A ret = settings_parse_line(set_parser, line);
0N/A if (mail_debug && ret >= 0) {
0N/A i_debug(ret == 0 ?
0N/A "Unknown userdb setting: %s" :
0N/A "Added userdb setting: %s", line);
0N/A }
0N/A return ret;
0N/A}
0N/A
0N/Astatic bool validate_chroot(const struct mail_user_settings *user_set,
0N/A const char *dir)
0N/A{
0N/A const char *const *chroot_dirs;
0N/A
0N/A if (*dir == '\0')
0N/A return FALSE;
0N/A
0N/A if (*user_set->valid_chroot_dirs == '\0')
0N/A return FALSE;
0N/A
0N/A chroot_dirs = t_strsplit(user_set->valid_chroot_dirs, ":");
0N/A while (*chroot_dirs != NULL) {
0N/A if (**chroot_dirs != '\0' &&
0N/A strncmp(dir, *chroot_dirs, strlen(*chroot_dirs)) == 0)
0N/A return TRUE;
chroot_dirs++;
}
return FALSE;
}
static int
user_reply_handle(struct mail_storage_service_ctx *ctx,
struct mail_storage_service_user *user,
const struct auth_user_reply *reply,
const char **error_r)
{
const char *home = reply->home;
const char *chroot = reply->chroot;
const char *const *str, *line, *p;
unsigned int i, count;
int ret = 0;
if (reply->uid != (uid_t)-1) {
if (reply->uid == 0) {
*error_r = "userdb returned 0 as uid";
return -1;
}
user->uid_source = "userdb lookup";
set_keyval(ctx, user, "mail_uid", dec2str(reply->uid));
}
if (reply->gid != (uid_t)-1) {
user->gid_source = "userdb lookup";
set_keyval(ctx, user, "mail_gid", dec2str(reply->gid));
}
if (home != NULL && chroot == NULL &&
*user->user_set->valid_chroot_dirs != '\0' &&
(p = strstr(home, "/./")) != NULL) {
/* wu-ftpd like <chroot>/./<home> - check only if there's even
a possibility of using them (non-empty valid_chroot_dirs) */
chroot = t_strdup_until(home, p);
home = p + 2;
}
if (home != NULL)
set_keyval(ctx, user, "mail_home", reply->home);
if (chroot != NULL) {
if (!validate_chroot(user->user_set, chroot)) {
*error_r = t_strdup_printf(
"userdb returned invalid chroot directory: %s "
"(see valid_chroot_dirs setting)", chroot);
return -1;
}
set_keyval(ctx, user, "mail_chroot", chroot);
}
str = array_get(&reply->extra_fields, &count);
for (i = 0; i < count && ret >= 0; i++) {
line = str[i];
if (strncmp(line, "system_groups_user=", 19) == 0) {
user->system_groups_user =
p_strdup(user->pool, line + 19);
} else if (strncmp(line, "nice=", 5) == 0) {
#ifdef HAVE_SETPRIORITY
int n = atoi(line + 5);
if (n != 0) {
if (setpriority(PRIO_PROCESS, 0, n) < 0)
i_error("setpriority(%d) failed: %m", n);
}
#endif
} else T_BEGIN {
ret = set_line(ctx, user, line);
} T_END;
}
if (ret < 0) {
*error_r = t_strdup_printf("Invalid userdb input '%s': %s",
str[i], settings_parser_get_error(user->set_parser));
}
return ret;
}
static int
service_auth_userdb_lookup(struct mail_storage_service_ctx *ctx,
const struct mail_storage_service_input *input,
pool_t pool, const char **user,
const char *const **fields_r,
const char **error_r)
{
struct auth_user_info info;
const char *new_username;
int ret;
memset(&info, 0, sizeof(info));
info.service = ctx->service->name;
info.local_ip = input->local_ip;
info.remote_ip = input->remote_ip;
ret = auth_master_user_lookup(ctx->conn, *user, &info, pool,
&new_username, fields_r);
if (ret > 0) {
if (strcmp(*user, new_username) != 0) {
if (ctx->debug)
i_debug("changed username to %s", new_username);
*user = t_strdup(new_username);
}
*user = new_username;
} else if (ret == 0)
*error_r = "Unknown user";
else if (**fields_r != NULL) {
*error_r = t_strdup(**fields_r);
ret = -2;
} else {
*error_r = MAIL_ERRSTR_CRITICAL_MSG;
}
return ret;
}
static bool parse_uid(const char *str, uid_t *uid_r, const char **error_r)
{
struct passwd pw;
if (str_to_uid(str, uid_r) == 0)
return TRUE;
switch (i_getpwnam(str, &pw)) {
case -1:
*error_r = t_strdup_printf("getpwnam(%s) failed: %m", str);
return FALSE;
case 0:
*error_r = t_strconcat("Unknown UNIX UID user: ", str, NULL);
return FALSE;
default:
*uid_r = pw.pw_uid;
return TRUE;
}
}
static bool parse_gid(const char *str, gid_t *gid_r, const char **error_r)
{
struct group gr;
if (str_to_gid(str, gid_r) == 0)
return TRUE;
switch (i_getgrnam(str, &gr)) {
case -1:
*error_r = t_strdup_printf("getgrnam(%s) failed: %m", str);
return FALSE;
case 0:
*error_r = t_strconcat("Unknown UNIX GID group: ", str, NULL);
return FALSE;
default:
*gid_r = gr.gr_gid;
return TRUE;
}
}
static int
service_drop_privileges(struct mail_storage_service_user *user,
const struct mail_user_settings *set,
const char *home, const char *chroot,
bool disallow_root, bool keep_setuid_root,
bool setenv_only, const char **error_r)
{
struct restrict_access_settings rset;
uid_t current_euid, setuid_uid = 0;
const char *cur_chroot, *error;
current_euid = geteuid();
restrict_access_init(&rset);
restrict_access_get_env(&rset);
if (*set->mail_uid != '\0') {
if (!parse_uid(set->mail_uid, &rset.uid, &error)) {
*error_r = t_strdup_printf("%s (from %s)", error,
user->uid_source);
return -1;
}
if (rset.uid < (uid_t)set->first_valid_uid ||
(set->last_valid_uid != 0 &&
rset.uid > (uid_t)set->last_valid_uid)) {
*error_r = t_strdup_printf(
"Mail access for users with UID %s not permitted "
"(see first_valid_uid in config file, uid from %s).",
dec2str(rset.uid), user->uid_source);
return -1;
}
rset.uid_source = user->uid_source;
} else if (rset.uid == (uid_t)-1 &&
disallow_root && current_euid == 0) {
*error_r = "User is missing UID (see mail_uid setting)";
return -1;
}
if (*set->mail_gid != '\0') {
if (!parse_gid(set->mail_gid, &rset.gid, &error)) {
*error_r = t_strdup_printf("%s (from %s)", error,
user->gid_source);
return -1;
}
if (rset.gid < (gid_t)set->first_valid_gid ||
(set->last_valid_gid != 0 &&
rset.gid > (gid_t)set->last_valid_gid)) {
*error_r = t_strdup_printf(
"Mail access for users with GID %s not permitted "
"(see first_valid_gid in config file, gid from %s).",
dec2str(rset.gid), user->gid_source);
return -1;
}
rset.gid_source = user->gid_source;
} else if (rset.gid == (gid_t)-1 && disallow_root &&
set->first_valid_gid > 0 && getegid() == 0) {
*error_r = "User is missing GID (see mail_gid setting)";
return -1;
}
if (*set->mail_privileged_group != '\0') {
if (!parse_gid(set->mail_privileged_group, &rset.privileged_gid,
&error)) {
*error_r = t_strdup_printf(
"%s (in mail_privileged_group setting)", error);
return -1;
}
}
if (*set->mail_access_groups != '\0') {
rset.extra_groups = t_strconcat(set->mail_access_groups, ",",
rset.extra_groups, NULL);
}
rset.first_valid_gid = set->first_valid_gid;
rset.last_valid_gid = set->last_valid_gid;
/* we can't chroot if we want to switch between users. there's not
much point either (from security point of view) */
rset.chroot_dir = *chroot == '\0' || keep_setuid_root ? NULL : chroot;
rset.system_groups_user = user->system_groups_user;
cur_chroot = restrict_access_get_current_chroot();
if (cur_chroot != NULL) {
if (rset.chroot_dir == NULL) {
*error_r = "Process is already chrooted, "
"can't un-chroot for this user";
return -1;
}
if (strcmp(rset.chroot_dir, cur_chroot) != 0) {
*error_r = t_strdup_printf(
"Process is already chrooted to %s, "
"can't chroot to %s", cur_chroot, chroot);
return -1;
}
/* chrooting to same directory where we're already chrooted */
rset.chroot_dir = NULL;
}
if (disallow_root &&
(rset.uid == 0 || (rset.uid == (uid_t)-1 && current_euid == 0))) {
*error_r = "Mail access not allowed for root";
return -1;
}
if (keep_setuid_root) {
if (current_euid != rset.uid) {
if (current_euid != 0) {
/* we're changing the UID,
switch back to root first */
if (seteuid(0) < 0)
i_fatal("seteuid(0) failed: %m");
}
setuid_uid = rset.uid;
}
rset.uid = (uid_t)-1;
disallow_root = FALSE;
}
if (!setenv_only) {
restrict_access(&rset, *home == '\0' ? NULL : home,
disallow_root);
} else {
restrict_access_set_env(&rset);
}
if (setuid_uid != 0 && !setenv_only) {
if (seteuid(setuid_uid) < 0)
i_fatal("seteuid(%s) failed: %m", dec2str(setuid_uid));
}
return 0;
}
static int
mail_storage_service_init_post(struct mail_storage_service_ctx *ctx,
struct mail_storage_service_user *user,
const char *home, struct mail_user **mail_user_r,
const char **error_r)
{
const struct mail_storage_settings *mail_set;
struct mail_user *mail_user;
mail_user = mail_user_alloc(user->input.username, user->user_info,
user->user_set);
mail_user_set_home(mail_user, *home == '\0' ? NULL : home);
mail_user_set_vars(mail_user, geteuid(), ctx->service->name,
&user->input.local_ip, &user->input.remote_ip);
mail_set = mail_user_set_get_storage_set(mail_user);
if (mail_set->mail_debug) {
i_debug("Effective uid=%s, gid=%s, home=%s",
dec2str(geteuid()), dec2str(getegid()), home);
}
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP) != 0 &&
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS) == 0) {
/* we don't want to write core files to any users' home
directories since they could contain information about other
users' mails as well. so do no chdiring to home. */
} else if (*home != '\0' &&
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR) == 0) {
/* If possible chdir to home directory, so that core file
could be written in case we crash. */
if (chdir(home) < 0) {
if (errno == EACCES) {
i_error("%s", eacces_error_get("chdir",
t_strconcat(home, "/", NULL)));
} if (errno != ENOENT)
i_error("chdir(%s) failed: %m", home);
else if (mail_set->mail_debug)
i_debug("Home dir not found: %s", home);
}
}
if (mail_user_init(mail_user, error_r) < 0) {
mail_user_unref(&mail_user);
return -1;
}
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_NAMESPACES) == 0) {
if (mail_namespaces_init(mail_user, error_r) < 0) {
mail_user_unref(&mail_user);
return -1;
}
}
*mail_user_r = mail_user;
return 0;
}
static const struct var_expand_table *
get_var_expand_table(struct master_service *service,
struct mail_storage_service_input *input)
{
static struct var_expand_table static_tab[] = {
{ 'u', NULL, "user" },
{ 'n', NULL, "username" },
{ 'd', NULL, "domain" },
{ 's', NULL, "service" },
{ 'l', NULL, "lip" },
{ 'r', NULL, "rip" },
{ 'p', NULL, "pid" },
{ 'i', NULL, "uid" },
{ '\0', NULL, NULL }
};
struct var_expand_table *tab;
tab = t_malloc(sizeof(static_tab));
memcpy(tab, static_tab, sizeof(static_tab));
tab[0].value = input->username;
tab[1].value = t_strcut(input->username, '@');
tab[2].value = strchr(input->username, '@');
if (tab[2].value != NULL) tab[2].value++;
tab[3].value = service->name;
tab[4].value = net_ip2addr(&input->local_ip);
tab[5].value = net_ip2addr(&input->remote_ip);
tab[6].value = my_pid;
tab[7].value = dec2str(geteuid());
return tab;
}
static const char *
user_expand_varstr(struct master_service *service,
struct mail_storage_service_input *input, const char *str)
{
string_t *ret;
if (*str == SETTING_STRVAR_EXPANDED[0])
return str + 1;
i_assert(*str == SETTING_STRVAR_UNEXPANDED[0]);
ret = t_str_new(256);
var_expand(ret, str + 1, get_var_expand_table(service, input));
return str_c(ret);
}
static void
mail_storage_service_init_log(struct mail_storage_service_ctx *ctx,
struct mail_storage_service_user *user)
{
ctx->log_initialized = TRUE;
T_BEGIN {
string_t *str;
struct ioloop_log *log;
str = t_str_new(256);
var_expand(str, user->user_set->mail_log_prefix,
get_var_expand_table(ctx->service, &user->input));
master_service_init_log(ctx->service, str_c(str));
log = io_loop_log_new(current_ioloop);
io_loop_log_set_prefix(log, str_c(str));
io_loop_log_unref(&log);
} T_END;
}
static void mail_storage_service_time_moved(time_t old_time, time_t new_time)
{
long diff = new_time - old_time;
if (diff > 0) {
if (diff > MAX_NOWARN_FORWARD_SECS)
i_warning("Time jumped forwards %ld seconds", diff);
return;
}
diff = -diff;
if (diff > MAX_TIME_BACKWARDS_SLEEP) {
i_fatal("Time just moved backwards by %ld seconds. "
"This might cause a lot of problems, "
"so I'll just kill myself now. "
"http://wiki2.dovecot.org/TimeMovedBackwards", diff);
} else {
i_error("Time just moved backwards by %ld seconds. "
"I'll sleep now until we're back in present. "
"http://wiki2.dovecot.org/TimeMovedBackwards", diff);
/* Sleep extra second to make sure usecs also grows. */
diff++;
while (diff > 0 && sleep(diff) != 0) {
/* don't use sleep()'s return value, because
it could get us to a long loop in case
interrupts just keep coming */
diff = old_time - time(NULL) + 1;
}
}
}
struct mail_storage_service_ctx *
mail_storage_service_init(struct master_service *service,
const struct setting_parser_info *set_roots[],
enum mail_storage_service_flags flags)
{
struct mail_storage_service_ctx *ctx;
pool_t pool;
unsigned int count;
(void)umask(0077);
io_loop_set_time_moved_callback(current_ioloop,
mail_storage_service_time_moved);
mail_storage_init();
mail_storage_register_all();
mailbox_list_register_all();
pool = pool_alloconly_create("mail storage service", 2048);
ctx = p_new(pool, struct mail_storage_service_ctx, 1);
ctx->pool = pool;
ctx->service = service;
ctx->flags = flags;
/* @UNSAFE */
if (set_roots == NULL)
count = 0;
else
for (count = 0; set_roots[count] != NULL; count++) ;
ctx->set_roots =
p_new(pool, const struct setting_parser_info *, count + 2);
ctx->set_roots[0] = &mail_user_setting_parser_info;
if (set_roots != NULL) {
memcpy(ctx->set_roots + 1, set_roots,
sizeof(*ctx->set_roots) * count);
}
/* do all the global initialization. delay initializing plugins until
we drop privileges the first time. */
if ((flags & MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT) == 0) {
/* note: we may not have read any settings yet, so this logging
may still be going to wrong location */
const char *log_prefix = t_strconcat(service->name, ": ", NULL);
master_service_init_log(service, log_prefix);
io_loop_set_default_log_prefix(current_ioloop, log_prefix);
}
dict_drivers_register_builtin();
return ctx;
}
struct auth_master_connection *
mail_storage_service_get_auth_conn(struct mail_storage_service_ctx *ctx)
{
i_assert(ctx->conn != NULL);
return ctx->conn;
}
int mail_storage_service_read_settings(struct mail_storage_service_ctx *ctx,
const struct mail_storage_service_input *input,
pool_t pool,
const struct setting_parser_info **user_info_r,
const struct setting_parser_context **parser_r,
const char **error_r)
{
struct master_service_settings_input set_input;
const struct setting_parser_info *const *roots;
struct master_service_settings_output set_output;
const struct dynamic_settings_parser *dyn_parsers;
unsigned int i;
memset(&set_input, 0, sizeof(set_input));
set_input.roots = ctx->set_roots;
set_input.preserve_user = TRUE;
/* settings reader may exec doveconf, which is going to clear
environment, and if we're not doing a userdb lookup we want to
use $HOME */
set_input.preserve_home =
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP) == 0;
set_input.use_sysexits =
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_USE_SYSEXITS) != 0;
if (input != NULL) {
set_input.module = input->module;
set_input.service = input->service;
set_input.username = input->username;
set_input.local_ip = input->local_ip;
set_input.remote_ip = input->remote_ip;
}
if (ctx->set_cache == NULL) {
ctx->set_cache_module = p_strdup(ctx->pool, set_input.module);
ctx->set_cache_service = p_strdup(ctx->pool, set_input.service);
ctx->set_cache = master_service_settings_cache_init(
ctx->service, set_input.module, set_input.service);
} else {
/* already looked up settings at least once.
we really shouldn't be execing anymore. */
set_input.never_exec = TRUE;
}
dyn_parsers = mail_storage_get_dynamic_parsers(pool);
if (null_strcmp(set_input.module, ctx->set_cache_module) == 0 &&
null_strcmp(set_input.service, ctx->set_cache_service) == 0) {
if (master_service_settings_cache_read(ctx->set_cache,
&set_input, dyn_parsers,
parser_r, error_r) < 0) {
*error_r = t_strdup_printf(
"Error reading configuration: %s", *error_r);
return -1;
}
} else {
settings_parser_dyn_update(pool, &set_input.roots, dyn_parsers);
if (master_service_settings_read(ctx->service, &set_input,
&set_output, error_r) < 0) {
*error_r = t_strdup_printf(
"Error reading configuration: %s", *error_r);
return -1;
}
*parser_r = ctx->service->set_parser;
}
roots = settings_parser_get_roots(*parser_r);
for (i = 0; roots[i] != NULL; i++) {
if (strcmp(roots[i]->module_name,
mail_user_setting_parser_info.module_name) == 0) {
*user_info_r = roots[i];
return 0;
}
}
i_unreached();
return -1;
}
static void
mail_storage_service_first_init(struct mail_storage_service_ctx *ctx,
const struct setting_parser_info *user_info,
const struct mail_user_settings *user_set)
{
enum auth_master_flags flags = 0;
i_assert(ctx->conn == NULL);
ctx->debug = mail_user_set_get_mail_debug(user_info, user_set);
if (ctx->debug)
flags |= AUTH_MASTER_FLAG_DEBUG;
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_IDLE_TIMEOUT) != 0)
flags |= AUTH_MASTER_FLAG_NO_IDLE_TIMEOUT;
ctx->conn = auth_master_init(user_set->auth_socket_path, flags);
i_assert(mail_user_auth_master_conn == NULL);
mail_user_auth_master_conn = ctx->conn;
}
static void
mail_storage_service_load_modules(struct mail_storage_service_ctx *ctx,
const struct setting_parser_info *user_info,
const struct mail_user_settings *user_set)
{
struct module_dir_load_settings mod_set;
if (*user_set->mail_plugins == '\0')
return;
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_PLUGINS) != 0)
return;
memset(&mod_set, 0, sizeof(mod_set));
mod_set.version = master_service_get_version_string(ctx->service);
mod_set.binary_name = master_service_get_name(ctx->service);
mod_set.setting_name = "mail_plugins";
mod_set.require_init_funcs = TRUE;
mod_set.debug = mail_user_set_get_mail_debug(user_info, user_set);
mail_storage_service_modules =
module_dir_load_missing(mail_storage_service_modules,
user_set->mail_plugin_dir,
user_set->mail_plugins, &mod_set);
}
int mail_storage_service_lookup(struct mail_storage_service_ctx *ctx,
const struct mail_storage_service_input *input,
struct mail_storage_service_user **user_r,
const char **error_r)
{
const bool userdb_lookup = !input->no_userdb_lookup &&
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP) != 0;
struct mail_storage_service_user *user;
const char *username = input->username;
const struct setting_parser_info *user_info;
const struct mail_user_settings *user_set;
const char *const *userdb_fields, *error;
struct auth_user_reply reply;
const struct setting_parser_context *set_parser;
pool_t user_pool, temp_pool;
int ret = 1;
user_pool = pool_alloconly_create("mail storage service user", 1024*5);
if (mail_storage_service_read_settings(ctx, input, user_pool,
&user_info, &set_parser,
&error) < 0) {
i_error("user %s: %s", username, error);
pool_unref(&user_pool);
*error_r = MAIL_ERRSTR_CRITICAL_MSG;
return -1;
}
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT) == 0 &&
!ctx->log_initialized) {
/* initialize logging again, in case we only read the
settings for the first above */
ctx->log_initialized = TRUE;
master_service_init_log(ctx->service,
t_strconcat(ctx->service->name, ": ", NULL));
}
user_set = settings_parser_get_list(set_parser)[1];
if (ctx->conn == NULL)
mail_storage_service_first_init(ctx, user_info, user_set);
/* load global plugins */
mail_storage_service_load_modules(ctx, user_info, user_set);
temp_pool = pool_alloconly_create("userdb lookup", 2048);
if (userdb_lookup) {
ret = service_auth_userdb_lookup(ctx, input, temp_pool,
&username, &userdb_fields,
error_r);
if (ret <= 0) {
pool_unref(&temp_pool);
pool_unref(&user_pool);
return ret;
}
} else {
userdb_fields = input->userdb_fields;
}
user = p_new(user_pool, struct mail_storage_service_user, 1);
memset(user_r, 0, sizeof(user_r));
user->pool = user_pool;
user->input = *input;
user->input.userdb_fields = NULL;
user->input.username = p_strdup(user_pool, username);
user->user_info = user_info;
user->set_parser = settings_parser_dup(set_parser, user_pool);
if (!settings_parser_check(user->set_parser, user_pool, &error))
i_panic("settings_parser_check() failed: %s", error);
user->user_set = settings_parser_get_list(user->set_parser)[1];
user->gid_source = "mail_gid setting";
user->uid_source = "mail_uid setting";
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_DEBUG) != 0)
(void)settings_parse_line(user->set_parser, "mail_debug=yes");
if (!userdb_lookup) {
const char *home = getenv("HOME");
if (home != NULL)
set_keyval(ctx, user, "mail_home", home);
}
if (userdb_fields != NULL) {
auth_user_fields_parse(userdb_fields, temp_pool, &reply);
if (user_reply_handle(ctx, user, &reply, &error) < 0) {
i_error("user %s: Invalid settings in userdb: %s",
username, error);
*error_r = ERRSTR_INVALID_USER_SETTINGS;
ret = -2;
}
}
pool_unref(&temp_pool);
/* load per-user plugins */
if (ret > 0) {
mail_storage_service_load_modules(ctx, user_info,
user->user_set);
}
*user_r = user;
return ret;
}
int mail_storage_service_next(struct mail_storage_service_ctx *ctx,
struct mail_storage_service_user *user,
struct mail_user **mail_user_r)
{
const struct mail_user_settings *user_set = user->user_set;
const char *home, *chroot, *error;
unsigned int len;
bool disallow_root =
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_DISALLOW_ROOT) != 0;
bool temp_priv_drop =
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP) != 0;
/* variable strings are expanded in mail_user_init(),
but we need the home and chroot sooner so do them separately here. */
home = user_expand_varstr(ctx->service, &user->input,
user_set->mail_home);
chroot = user_expand_varstr(ctx->service, &user->input,
user_set->mail_chroot);
if (*home != '/' && *home != '\0') {
i_error("user %s: "
"Relative home directory paths not supported: %s",
user->input.username, home);
return -2;
}
len = strlen(chroot);
if (len > 2 && strcmp(chroot + len - 2, "/.") == 0 &&
strncmp(home, chroot, len - 2) == 0) {
/* mail_chroot = /chroot/. means that the home dir already
contains the chroot dir. remove it from home. */
if (!temp_priv_drop) {
home += len - 2;
if (*home == '\0')
home = "/";
chroot = t_strndup(chroot, len - 2);
set_keyval(ctx, user, "mail_home", home);
set_keyval(ctx, user, "mail_chroot", chroot);
}
} else if (len > 0 && temp_priv_drop) {
/* we're dropping privileges only temporarily, so we can't
chroot. fix home directory so we can access it. */
if (*home == '\0' || strcmp(home, "/") == 0)
home = chroot;
else
home = t_strconcat(chroot, home, NULL);
chroot = "";
set_keyval(ctx, user, "mail_home", home);
}
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT) == 0)
mail_storage_service_init_log(ctx, user);
if ((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_NO_RESTRICT_ACCESS) == 0) {
if (service_drop_privileges(user, user_set, home, chroot,
disallow_root, temp_priv_drop,
FALSE, &error) < 0) {
i_error("user %s: Couldn't drop privileges: %s",
user->input.username, error);
return -1;
}
if (!temp_priv_drop ||
(ctx->flags & MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS) != 0)
restrict_access_allow_coredumps(TRUE);
}
/* privileges are dropped. initialize plugins that haven't been
initialized yet. */
module_dir_init(mail_storage_service_modules);
if (mail_storage_service_init_post(ctx, user, home,
mail_user_r, &error) < 0) {
i_error("user %s: Initialization failed: %s",
user->input.username, error);
return -2;
}
return 0;
}
void mail_storage_service_restrict_setenv(struct mail_storage_service_ctx *ctx,
struct mail_storage_service_user *user)
{
const struct mail_user_settings *user_set = user->user_set;
const char *home, *chroot, *error;
home = user_expand_varstr(ctx->service, &user->input,
user_set->mail_home);
chroot = user_expand_varstr(ctx->service, &user->input,
user_set->mail_chroot);
if (service_drop_privileges(user, user_set, home, chroot,
FALSE, FALSE, TRUE,
&error) < 0)
i_fatal("%s", error);
}
int mail_storage_service_lookup_next(struct mail_storage_service_ctx *ctx,
const struct mail_storage_service_input *input,
struct mail_storage_service_user **user_r,
struct mail_user **mail_user_r,
const char **error_r)
{
struct mail_storage_service_user *user;
int ret;
ret = mail_storage_service_lookup(ctx, input, &user, error_r);
if (ret <= 0)
return ret;
ret = mail_storage_service_next(ctx, user, mail_user_r);
if (ret < 0) {
mail_storage_service_user_free(&user);
*error_r = ret == -2 ? ERRSTR_INVALID_USER_SETTINGS :
MAIL_ERRSTR_CRITICAL_MSG;
return ret;
}
*user_r = user;
return 1;
}
void mail_storage_service_user_free(struct mail_storage_service_user **_user)
{
struct mail_storage_service_user *user = *_user;
*_user = NULL;
settings_parser_deinit(&user->set_parser);
pool_unref(&user->pool);
}
void mail_storage_service_init_settings(struct mail_storage_service_ctx *ctx,
const struct mail_storage_service_input *input)
{
const struct setting_parser_info *user_info;
const struct mail_user_settings *user_set;
const struct setting_parser_context *set_parser;
const char *error;
pool_t temp_pool;
if (ctx->conn != NULL)
return;
temp_pool = pool_alloconly_create("service all settings", 4096);
if (mail_storage_service_read_settings(ctx, input, temp_pool,
&user_info, &set_parser,
&error) < 0)
i_fatal("%s", error);
user_set = settings_parser_get_list(set_parser)[1];
mail_storage_service_first_init(ctx, user_info, user_set);
pool_unref(&temp_pool);
}
unsigned int
mail_storage_service_all_init(struct mail_storage_service_ctx *ctx)
{
if (ctx->auth_list != NULL)
(void)auth_master_user_list_deinit(&ctx->auth_list);
mail_storage_service_init_settings(ctx, NULL);
ctx->auth_list = auth_master_user_list_init(ctx->conn);
return auth_master_user_list_count(ctx->auth_list);
}
int mail_storage_service_all_next(struct mail_storage_service_ctx *ctx,
const char **username_r)
{
i_assert((ctx->flags & MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP) != 0);
*username_r = auth_master_user_list_next(ctx->auth_list);
if (*username_r != NULL)
return 1;
return auth_master_user_list_deinit(&ctx->auth_list);
}
void mail_storage_service_deinit(struct mail_storage_service_ctx **_ctx)
{
struct mail_storage_service_ctx *ctx = *_ctx;
*_ctx = NULL;
if (ctx->auth_list != NULL)
(void)auth_master_user_list_deinit(&ctx->auth_list);
if (ctx->conn != NULL) {
if (mail_user_auth_master_conn == ctx->conn)
mail_user_auth_master_conn = NULL;
auth_master_deinit(&ctx->conn);
}
if (ctx->set_cache != NULL)
master_service_settings_cache_deinit(&ctx->set_cache);
pool_unref(&ctx->pool);
module_dir_unload(&mail_storage_service_modules);
mail_storage_deinit();
dict_drivers_unregister_builtin();
}
void **mail_storage_service_user_get_set(struct mail_storage_service_user *user)
{
return settings_parser_get_list(user->set_parser) + 1;
}
const struct mail_storage_service_input *
mail_storage_service_user_get_input(struct mail_storage_service_user *user)
{
return &user->input;
}
struct setting_parser_context *
mail_storage_service_user_get_settings_parser(struct mail_storage_service_user *user)
{
return user->set_parser;
}
void *mail_storage_service_get_settings(struct master_service *service)
{
void **sets, *set;
T_BEGIN {
sets = master_service_settings_get_others(service);
set = sets[1];
} T_END;
return set;
}