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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <pulse/util.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulsecore/random.h>
#include <pulsecore/macro.h>
#include "authkey.h"
/* Generate a new authentication key, store it in file fd and return it in *data */
static int generate(int fd, void *ret_data, size_t length) {
ssize_t r;
pa_assert(fd >= 0);
pa_assert(ret_data);
pa_assert(length > 0);
pa_random(ret_data, length);
lseek(fd, (off_t) 0, SEEK_SET);
if (ftruncate(fd, (off_t) 0) < 0) {
pa_log("Failed to truncate cookie file: %s", pa_cstrerror(errno));
return -1;
}
if ((r = pa_loop_write(fd, ret_data, length, NULL)) < 0 || (size_t) r != length) {
pa_log("Failed to write cookie file: %s", pa_cstrerror(errno));
return -1;
}
return 0;
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* Load an authentication cookie from file fn and store it in data. If
* the cookie file doesn't exist, create it */
static int load(const char *fn, bool create, void *data, size_t length) {
int fd = -1;
int writable = 1;
int unlock = 0, ret = -1;
ssize_t r;
pa_assert(fn);
pa_assert(data);
pa_assert(length > 0);
if (create)
pa_make_secure_parent_dir(fn, pa_in_system_mode() ? 0755U : 0700U, -1, -1, false);
if ((fd = pa_open_cloexec(fn, (create ? O_RDWR|O_CREAT : O_RDONLY)|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
if (!create || errno != EACCES || (fd = open(fn, O_RDONLY|O_BINARY)) < 0) {
pa_log_warn("Failed to open cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
} else
writable = 0;
}
unlock = pa_lock_fd(fd, 1) >= 0;
if ((r = pa_loop_read(fd, data, length, NULL)) < 0) {
pa_log("Failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
}
if ((size_t) r != length) {
pa_log_debug("Got %d bytes from cookie file '%s', expected %d", (int) r, fn, (int) length);
if (!writable) {
pa_log_warn("Unable to write cookie to read-only file");
goto finish;
}
if (generate(fd, data, length) < 0)
goto finish;
}
ret = 0;
finish:
if (fd >= 0) {
if (unlock)
pa_lock_fd(fd, 0);
if (pa_close(fd) < 0) {
pa_log_warn("Failed to close cookie file: %s", pa_cstrerror(errno));
ret = -1;
}
}
return ret;
}
/* If the specified file path starts with / return it, otherwise
* return path prepended with the config home directory. */
static int normalize_path(const char *fn, char **_r) {
pa_assert(fn);
pa_assert(_r);
if (!pa_is_path_absolute(fn))
return pa_append_to_config_home_dir(fn, _r);
*_r = pa_xstrdup(fn);
return 0;
}
int pa_authkey_load(const char *fn, bool create, void *data, size_t length) {
char *p;
int ret;
pa_assert(fn);
pa_assert(data);
pa_assert(length > 0);
if ((ret = normalize_path(fn, &p)) < 0)
return ret;
if ((ret = load(p, create, data, length)) < 0)
pa_log_warn("Failed to load authentication key '%s': %s", p, (ret < 0) ? pa_cstrerror(errno) : "File corrupt");
pa_xfree(p);
return ret;
}
/* Store the specified cookie in the specified cookie file */
int pa_authkey_save(const char *fn, const void *data, size_t length) {
int fd = -1;
int unlock = 0, ret;
ssize_t r;
char *p;
pa_assert(fn);
pa_assert(data);
pa_assert(length > 0);
if ((ret = normalize_path(fn, &p)) < 0)
return ret;
if ((fd = pa_open_cloexec(p, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
pa_log_warn("Failed to open cookie file '%s': %s", fn, pa_cstrerror(errno));
ret = -1;
goto finish;
}
unlock = pa_lock_fd(fd, 1) >= 0;
if ((r = pa_loop_write(fd, data, length, NULL)) < 0 || (size_t) r != length) {
pa_log("Failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
ret = -1;
goto finish;
}
finish:
if (fd >= 0) {
if (unlock)
pa_lock_fd(fd, 0);
if (pa_close(fd) < 0) {
pa_log_warn("Failed to close cookie file: %s", pa_cstrerror(errno));
ret = -1;
}
}
pa_xfree(p);
return ret;
}
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