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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grp.h>
#include <pwd.h>
#include <sudoers.h>
#include <pwutil.h>
/*
* Expand leading tilde in *path, which must be dynamically allocated.
* Replaces path with the expanded version as needed, freeing the old one.
* Returns true on success, false on failure.
*/
bool
expand_tilde(char **path, const char *user)
{
char *npath, *opath = *path;
char *slash = NULL;
struct passwd *pw;
int len;
debug_decl(expand_tilde, SUDOERS_DEBUG_UTIL);
switch (*opath++) {
case '/':
/* A fully-qualified path, nothing to do. */
debug_return_bool(true);
case '~':
/* See below. */
break;
default:
/* Not a fully-qualified path or one that starts with a tilde. */
debug_return_bool(false);
}
switch (*opath) {
case '\0':
/* format: ~ */
break;
case '/':
/* format: ~/foo */
opath++;
break;
default:
/* format: ~user/foo */
user = opath;
slash = strchr(opath, '/');
if (slash != NULL) {
*slash = '\0';
opath = slash + 1;
} else {
opath = (char *)"";
}
}
pw = sudo_getpwnam(user);
if (slash != NULL)
*slash = '/';
if (pw == NULL) {
/* Unknown user. */
sudo_warnx(U_("unknown user %s"), user);
debug_return_bool(false);
}
len = asprintf(&npath, "%s%s%s", pw->pw_dir, *opath ? "/" : "", opath);
sudo_pw_delref(pw);
if (len == -1) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_bool(false);
}
free(*path);
*path = npath;
debug_return_bool(true);
}
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