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/*
* Copyright (c) 2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#ifdef HAVE_SELINUX_RUNTIME
# include <assert.h>
# include <errno.h>
# include <stdlib.h>
# include <string.h>
# include <unistd.h>
# include <selinux/selinux.h>
# include "xmalloc.h"
# define TEST_SECONTEXT
# include "secontext.h"
static char *
secontext_format(char *context, const char *fmt)
ATTRIBUTE_FORMAT((printf, 2, 0)) ATTRIBUTE_MALLOC;
static char *
secontext_format(char *context, const char *fmt)
{
int saved_errno = errno;
char *res = context ? xasprintf(fmt, context) : xstrdup("");
free(context);
errno = saved_errno;
return res;
}
# define FORMAT_SPACE_BEFORE(string) secontext_format(string, " [%s]")
# define FORMAT_SPACE_AFTER(string) secontext_format(string, "[%s] ")
static char *
strip_trailing_newlines(char *context)
{
/*
* On the CI at least, the context may have a trailing \n,
* let's remove it just in case.
*/
size_t len = strlen(context);
for (; len > 0; --len) {
if (context[len - 1] != '\n')
break;
}
context[len] = '\0';
return context;
}
static char *
raw_secontext_full_file(const char *filename)
{
int saved_errno = errno;
char *full_secontext = NULL;
char *secontext;
if (getfilecon(filename, &secontext) >= 0) {
full_secontext = strip_trailing_newlines(xstrdup(secontext));
freecon(secontext);
}
errno = saved_errno;
return full_secontext;
}
static char *
raw_secontext_short_file(const char *filename)
{
int saved_errno = errno;
char *ctx = raw_secontext_full_file(filename);
if (ctx == NULL)
return ctx;
char *saveptr = NULL;
const char *token;
unsigned int i;
char *ctx_copy = xstrdup(ctx);
char *context = NULL;
for (token = strtok_r(ctx_copy, ":", &saveptr), i = 0;
token; token = strtok_r(NULL, ":", &saveptr), i++) {
if (i == 2) {
context = xstrdup(token);
break;
}
}
if (context == NULL)
context = xstrdup(ctx);
free(ctx_copy);
free(ctx);
errno = saved_errno;
return context;
}
static char *
raw_secontext_full_pid(pid_t pid)
{
int saved_errno = errno;
char *full_secontext = NULL;
char *secontext;
if (getpidcon(pid, &secontext) == 0) {
full_secontext = strip_trailing_newlines(xstrdup(secontext));
freecon(secontext);
}
errno = saved_errno;
return full_secontext;
}
static char *
raw_secontext_short_pid(pid_t pid)
{
int saved_errno = errno;
char *ctx = raw_secontext_full_pid(pid);
if (ctx == NULL)
return ctx;
char *saveptr = NULL;
const char *token;
int i;
char *ctx_copy = xstrdup(ctx);
char *context = NULL;
for (token = strtok_r(ctx_copy, ":", &saveptr), i = 0;
token; token = strtok_r(NULL, ":", &saveptr), i++) {
if (i == 2) {
context = xstrdup(token);
break;
}
}
if (context == NULL)
context = xstrdup(ctx);
free(ctx_copy);
free(ctx);
errno = saved_errno;
return context;
}
char *
secontext_full_file(const char *filename)
{
return FORMAT_SPACE_BEFORE(raw_secontext_full_file(filename));
}
char *
secontext_full_pid(pid_t pid)
{
return FORMAT_SPACE_AFTER(raw_secontext_full_pid(pid));
}
char *
secontext_short_file(const char *filename)
{
return FORMAT_SPACE_BEFORE(raw_secontext_short_file(filename));
}
char *
secontext_short_pid(pid_t pid)
{
return FORMAT_SPACE_AFTER(raw_secontext_short_pid(pid));
}
void
update_secontext_type(const char *file, const char *newtype)
{
char *ctx = raw_secontext_full_file(file);
if (ctx == NULL)
return;
char *saveptr = NULL;
char *token;
int field;
char *split[4];
for (token = strtok_r(ctx, ":", &saveptr), field = 0;
token; token = strtok_r(NULL, ":", &saveptr), field++) {
assert(field < 4);
split[field] = token;
}
assert(field == 4);
char *newcontext = xasprintf("%s:%s:%s:%s", split[0], split[1],
newtype, split[3]);
(void) setfilecon(file, newcontext);
free(newcontext);
free(ctx);
}
#endif /* HAVE_SELINUX_RUNTIME */
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