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/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "buffer.h"
#include "env-util.h"
#include "execv-const.h"
#include "master-service.h"
#include "settings-parser.h"
#include "config-parser-private.h"
#include "managesieve-login-settings-plugin.h"
#include <stddef.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sysexits.h>
typedef enum { CAP_SIEVE, CAP_NOTIFY } capability_type_t;
bool capability_dumped = FALSE;
static char *capability_sieve = NULL;
static char *capability_notify = NULL;
static void (*next_hook_config_parser_begin)(struct config_parser_context *ctx) = NULL;
static void managesieve_login_config_parser_begin(struct config_parser_context *ctx);
const char *managesieve_login_settings_version = DOVECOT_ABI_VERSION;
void managesieve_login_settings_init(struct module *module ATTR_UNUSED)
{
next_hook_config_parser_begin = hook_config_parser_begin;
hook_config_parser_begin = managesieve_login_config_parser_begin;
}
void managesieve_login_settings_deinit(void)
{
hook_config_parser_begin = next_hook_config_parser_begin;
if ( capability_sieve != NULL )
i_free(capability_sieve);
if ( capability_notify != NULL )
i_free(capability_notify);
}
static void capability_store(capability_type_t cap_type, const char *value)
{
switch ( cap_type ) {
case CAP_SIEVE:
capability_sieve = i_strdup(value);
break;
case CAP_NOTIFY:
capability_notify = i_strdup(value);
break;
}
}
static void capability_parse(const char *cap_string)
{
capability_type_t cap_type = CAP_SIEVE;
const char *p = cap_string;
string_t *part = t_str_new(256);
if ( cap_string == NULL || *cap_string == '\0' ) {
i_warning("managesieve-login: capability string is empty.");
return;
}
while ( *p != '\0' ) {
if ( *p == '\\' ) {
p++;
if ( *p != '\0' ) {
str_append_c(part, *p);
p++;
} else break;
} else if ( *p == ':' ) {
if ( strcasecmp(str_c(part), "SIEVE") == 0 )
cap_type = CAP_SIEVE;
else if ( strcasecmp(str_c(part), "NOTIFY") == 0 )
cap_type = CAP_NOTIFY;
else
i_warning("managesieve-login: unknown capability '%s' listed in "
"capability string (ignored).", str_c(part));
str_truncate(part, 0);
} else if ( *p == ',' ) {
capability_store(cap_type, str_c(part));
str_truncate(part, 0);
} else {
/* Append character, but omit leading spaces */
if ( str_len(part) > 0 || *p != ' ' )
str_append_c(part, *p);
}
p++;
}
if ( str_len(part) > 0 ) {
capability_store(cap_type, str_c(part));
}
}
static bool capability_dump(void)
{
char buf[4096];
int fd[2], status = 0;
ssize_t ret;
unsigned int pos;
pid_t pid;
if ( getenv("DUMP_CAPABILITY") != NULL )
return TRUE;
if ( pipe(fd) < 0 ) {
i_error("managesieve-login: dump-capability pipe() failed: %m");
return FALSE;
}
fd_close_on_exec(fd[0], TRUE);
fd_close_on_exec(fd[1], TRUE);
if ( (pid = fork()) == (pid_t)-1 ) {
(void)close(fd[0]); (void)close(fd[1]);
i_error("managesieve-login: dump-capability fork() failed: %m");
return FALSE;
}
if ( pid == 0 ) {
const char *argv[5];
/* Child */
(void)close(fd[0]);
if (dup2(fd[1], STDOUT_FILENO) < 0)
i_fatal("managesieve-login: dump-capability dup2() failed: %m");
env_put("DUMP_CAPABILITY=1");
argv[0] = PKG_LIBEXECDIR"/managesieve";
argv[1] = "-k";
argv[2] = "-c";
argv[3] = master_service_get_config_path(master_service);
argv[4] = NULL;
execv_const(argv[0], argv);
i_fatal("managesieve-login: dump-capability execv(%s) failed: %m", argv[0]);
}
(void)close(fd[1]);
alarm(60);
if (wait(&status) == -1) {
i_error("managesieve-login: dump-capability failed: process %d got stuck",
(int)pid);
return FALSE;
}
alarm(0);
if (status != 0) {
(void)close(fd[0]);
if (WIFSIGNALED(status)) {
i_error("managesieve-login: dump-capability process "
"killed with signal %d", WTERMSIG(status));
} else {
i_error("managesieve-login: dump-capability process returned %d",
WIFEXITED(status) ? WEXITSTATUS(status) : status);
}
return FALSE;
}
pos = 0;
while ((ret = read(fd[0], buf + pos, sizeof(buf) - pos)) > 0)
pos += ret;
if (ret < 0) {
i_error("managesieve-login: read(dump-capability process) failed: %m");
(void)close(fd[0]);
return FALSE;
}
(void)close(fd[0]);
if (pos == 0 || buf[pos-1] != '\n') {
i_error("managesieve-login: dump-capability: Couldn't read capability "
"(got %u bytes)", pos);
return FALSE;
}
buf[pos-1] = '\0';
capability_parse(buf);
return TRUE;
}
static void managesieve_login_config_set
(struct config_parser_context *ctx, const char *key, const char *value)
{
config_apply_line(ctx, key, t_strdup_printf("%s=%s", key, value), NULL);
}
static void managesieve_login_config_parser_begin(struct config_parser_context *ctx)
{
const char *const *module = ctx->modules;
if ( module != NULL && *module != NULL ) {
while ( *module != NULL ) {
if ( strcmp(*module, "managesieve-login") == 0 )
break;
module++;
}
if ( *module == NULL )
return;
}
if ( !capability_dumped ) {
(void)capability_dump();
capability_dumped = TRUE;
}
if ( capability_sieve != NULL )
managesieve_login_config_set(ctx, "managesieve_sieve_capability", capability_sieve);
if ( capability_notify != NULL )
managesieve_login_config_set(ctx, "managesieve_notify_capability", capability_notify);
}
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