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/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "cookie-support.h"
#include "../libsnap-confine-private/cleanup-funcs.h"
#include "../libsnap-confine-private/string-utils.h"
#include "../libsnap-confine-private/utils.h"
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define SC_COOKIE_DIR "/var/lib/snapd/cookie"
/**
* Effective value of SC_COOKIE_DIR
**/
static const char *sc_cookie_dir = SC_COOKIE_DIR;
char *sc_cookie_get_from_snapd(const char *snap_name, struct sc_error **errorp) {
char context_path[PATH_MAX] = {0};
struct sc_error *err = NULL;
char *context = NULL;
sc_must_snprintf(context_path, sizeof(context_path), "%s/snap.%s", sc_cookie_dir, snap_name);
int fd SC_CLEANUP(sc_cleanup_close) = -1;
fd = open(context_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
if (fd < 0) {
err = sc_error_init_from_errno(errno, "warning: cannot open cookie file %s", context_path);
goto out;
}
// large enough buffer for opaque cookie string
char context_val[255] = {0};
ssize_t n = read(fd, context_val, sizeof(context_val) - 1);
if (n < 0) {
err = sc_error_init_from_errno(errno, "cannot read cookie file %s", context_path);
goto out;
}
context = strndup(context_val, n);
if (context == NULL) {
die("cannot duplicate snap cookie value");
}
out:
sc_error_forward(errorp, err);
return context;
}
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