f93cf255d4
Closes #238 Update all files to list SPDX license shortname. Most files are BSD 3 clause license. The exceptions are: serge@sl ~/src/shadow$ git grep SPDX-License | grep -v BSD-3-Clause contrib/atudel:# SPDX-License-Identifier: BSD-4-Clause lib/tcbfuncs.c: * SPDX-License-Identifier: 0BSD libmisc/salt.c: * SPDX-License-Identifier: Unlicense src/login_nopam.c: * SPDX-License-Identifier: Unlicense src/nologin.c: * SPDX-License-Identifier: BSD-2-Clause src/vipw.c: * SPDX-License-Identifier: GPL-2.0-or-later Signed-off-by: Serge Hallyn <serge@hallyn.com>
605 lines
15 KiB
C
605 lines
15 KiB
C
/*
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* SPDX-FileCopyrightText: 2001 Rafal Wojtczuk, Solar Designer
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* SPDX-License-Identifier: 0BSD
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <tcb.h>
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#include <unistd.h>
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#include "config.h"
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#include "defines.h"
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#include "prototypes.h"
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#include "getdef.h"
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#include "shadowio.h"
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#include "tcbfuncs.h"
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#define SHADOWTCB_HASH_BY 1000
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#define SHADOWTCB_LOCK_SUFFIX ".lock"
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static /*@null@*//*@only@*/char *stored_tcb_user = NULL;
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shadowtcb_status shadowtcb_drop_priv (void)
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{
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if (!getdef_bool ("USE_TCB")) {
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return SHADOWTCB_SUCCESS;
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}
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if (NULL != stored_tcb_user) {
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if (tcb_drop_priv (stored_tcb_user) == 0) {
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return SHADOWTCB_SUCCESS;
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}
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}
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return SHADOWTCB_FAILURE;
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}
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shadowtcb_status shadowtcb_gain_priv (void)
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{
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if (!getdef_bool ("USE_TCB")) {
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return SHADOWTCB_SUCCESS;
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}
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return (tcb_gain_priv () == 0) ? SHADOWTCB_SUCCESS : SHADOWTCB_FAILURE;
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}
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/* In case something goes wrong, we return immediately, not polluting the
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* code with free(). All errors are fatal, so the application is expected
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* to exit soon.
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*/
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#define OUT_OF_MEMORY do { \
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fprintf (shadow_logfd, _("%s: out of memory\n"), Prog); \
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(void) fflush (shadow_logfd); \
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} while (false)
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/* Returns user's tcb directory path relative to TCB_DIR. */
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static /*@null@*/ char *shadowtcb_path_rel (const char *name, uid_t uid)
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{
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char *ret;
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if (!getdef_bool ("TCB_SYMLINKS") || uid < SHADOWTCB_HASH_BY) {
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if (asprintf (&ret, "%s", name) == -1) {
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OUT_OF_MEMORY;
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return NULL;
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}
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} else if (uid < SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY) {
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if (asprintf (&ret, ":%dK/%s",
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uid / SHADOWTCB_HASH_BY, name) == -1) {
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OUT_OF_MEMORY;
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return NULL;
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}
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} else {
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if (asprintf (&ret, ":%dM/:%dK/%s",
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uid / (SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY),
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(uid % (SHADOWTCB_HASH_BY * SHADOWTCB_HASH_BY)) / SHADOWTCB_HASH_BY,
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name) == -1) {
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OUT_OF_MEMORY;
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return NULL;
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}
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}
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return ret;
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}
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static /*@null@*/ char *shadowtcb_path_rel_existing (const char *name)
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{
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char *path, *rval;
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struct stat st;
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char link[8192];
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ssize_t ret;
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if (asprintf (&path, TCB_DIR "/%s", name) == -1) {
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OUT_OF_MEMORY;
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return NULL;
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}
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if (lstat (path, &st) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot stat %s: %s\n"),
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Prog, path, strerror (errno));
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free (path);
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return NULL;
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}
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if (S_ISDIR (st.st_mode)) {
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free (path);
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rval = strdup (name);
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if (NULL == rval) {
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OUT_OF_MEMORY;
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return NULL;
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}
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return rval;
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}
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if (!S_ISLNK (st.st_mode)) {
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fprintf (shadow_logfd,
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_("%s: %s is neither a directory, nor a symlink.\n"),
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Prog, path);
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free (path);
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return NULL;
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}
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ret = readlink (path, link, sizeof (link) - 1);
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if (-1 == ret) {
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fprintf (shadow_logfd,
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_("%s: Cannot read symbolic link %s: %s\n"),
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Prog, path, strerror (errno));
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free (path);
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return NULL;
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}
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free (path);
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if ((size_t)ret >= sizeof(link) - 1) {
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link[sizeof(link) - 1] = '\0';
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fprintf (shadow_logfd,
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_("%s: Suspiciously long symlink: %s\n"),
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Prog, link);
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return NULL;
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}
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link[(size_t)ret] = '\0';
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rval = strdup (link);
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if (NULL == rval) {
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OUT_OF_MEMORY;
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return NULL;
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}
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return rval;
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}
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static /*@null@*/ char *shadowtcb_path (const char *name, uid_t uid)
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{
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char *ret, *rel;
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rel = shadowtcb_path_rel (name, uid);
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if (NULL == rel) {
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return NULL;
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}
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if (asprintf (&ret, TCB_DIR "/%s", rel) == -1) {
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OUT_OF_MEMORY;
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free (rel);
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return NULL;
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}
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free (rel);
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return ret;
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}
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static /*@null@*/ char *shadowtcb_path_existing (const char *name)
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{
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char *ret, *rel;
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rel = shadowtcb_path_rel_existing (name);
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if (NULL == rel) {
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return NULL;
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}
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if (asprintf (&ret, TCB_DIR "/%s", rel) == -1) {
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OUT_OF_MEMORY;
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free (rel);
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return NULL;
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}
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free (rel);
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return ret;
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}
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static shadowtcb_status mkdir_leading (const char *name, uid_t uid)
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{
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char *ind, *dir, *ptr, *path = shadowtcb_path_rel (name, uid);
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struct stat st;
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if (NULL == path) {
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return SHADOWTCB_FAILURE;
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}
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ptr = path;
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if (stat (TCB_DIR, &st) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot stat %s: %s\n"),
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Prog, TCB_DIR, strerror (errno));
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goto out_free_path;
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}
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while ((ind = strchr (ptr, '/'))) {
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*ind = '\0';
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if (asprintf (&dir, TCB_DIR "/%s", path) == -1) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if ((mkdir (dir, 0700) != 0) && (errno != EEXIST)) {
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fprintf (shadow_logfd,
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_("%s: Cannot create directory %s: %s\n"),
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Prog, dir, strerror (errno));
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goto out_free_dir;
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}
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if (chown (dir, 0, st.st_gid) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot change owner of %s: %s\n"),
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Prog, dir, strerror (errno));
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goto out_free_dir;
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}
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if (chmod (dir, 0711) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot change mode of %s: %s\n"),
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Prog, dir, strerror (errno));
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goto out_free_dir;
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}
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free (dir);
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*ind = '/';
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ptr = ind + 1;
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}
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free (path);
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return SHADOWTCB_SUCCESS;
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out_free_dir:
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free (dir);
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out_free_path:
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free (path);
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return SHADOWTCB_FAILURE;
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}
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static shadowtcb_status unlink_suffs (const char *user)
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{
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static char *suffs[] = { "+", "-", SHADOWTCB_LOCK_SUFFIX };
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char *tmp;
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int i;
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for (i = 0; i < 3; i++) {
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if (asprintf (&tmp, TCB_FMT "%s", user, suffs[i]) == -1) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if ((unlink (tmp) != 0) && (errno != ENOENT)) {
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fprintf (shadow_logfd,
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_("%s: unlink: %s: %s\n"),
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Prog, tmp, strerror (errno));
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free (tmp);
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return SHADOWTCB_FAILURE;
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}
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free (tmp);
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}
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return SHADOWTCB_SUCCESS;
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}
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/* path should be a relative existing tcb directory */
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static shadowtcb_status rmdir_leading (char *path)
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{
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char *ind, *dir;
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shadowtcb_status ret = SHADOWTCB_SUCCESS;
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while ((ind = strrchr (path, '/'))) {
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*ind = '\0';
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if (asprintf (&dir, TCB_DIR "/%s", path) == -1) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if (rmdir (dir) != 0) {
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if (errno != ENOTEMPTY) {
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fprintf (shadow_logfd,
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_("%s: Cannot remove directory %s: %s\n"),
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Prog, dir, strerror (errno));
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ret = SHADOWTCB_FAILURE;
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}
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free (dir);
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break;
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}
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free (dir);
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}
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return ret;
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}
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static shadowtcb_status move_dir (const char *user_newname, uid_t user_newid)
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{
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char *olddir = NULL, *newdir = NULL;
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char *real_old_dir = NULL, *real_new_dir = NULL;
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char *real_old_dir_rel = NULL, *real_new_dir_rel = NULL;
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uid_t old_uid, the_newid;
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struct stat oldmode;
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shadowtcb_status ret = SHADOWTCB_FAILURE;
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if (NULL == stored_tcb_user) {
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return SHADOWTCB_FAILURE;
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}
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if (asprintf (&olddir, TCB_DIR "/%s", stored_tcb_user) == -1) {
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goto out_free_nomem;
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}
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if (stat (olddir, &oldmode) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot stat %s: %s\n"),
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Prog, olddir, strerror (errno));
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goto out_free;
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}
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old_uid = oldmode.st_uid;
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the_newid = (user_newid == -1) ? old_uid : user_newid;
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real_old_dir = shadowtcb_path_existing (stored_tcb_user);
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if (NULL == real_old_dir) {
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goto out_free;
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}
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real_new_dir = shadowtcb_path (user_newname, the_newid);
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if (NULL == real_new_dir) {
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goto out_free;
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}
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if (strcmp (real_old_dir, real_new_dir) == 0) {
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ret = SHADOWTCB_SUCCESS;
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goto out_free;
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}
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real_old_dir_rel = shadowtcb_path_rel_existing (stored_tcb_user);
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if (NULL == real_old_dir_rel) {
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goto out_free;
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}
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if (mkdir_leading (user_newname, the_newid) == SHADOWTCB_FAILURE) {
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goto out_free;
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}
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if (rename (real_old_dir, real_new_dir) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot rename %s to %s: %s\n"),
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Prog, real_old_dir, real_new_dir, strerror (errno));
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goto out_free;
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}
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if (rmdir_leading (real_old_dir_rel) == SHADOWTCB_FAILURE) {
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goto out_free;
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}
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if ((unlink (olddir) != 0) && (errno != ENOENT)) {
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fprintf (shadow_logfd,
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_("%s: Cannot remove %s: %s\n"),
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Prog, olddir, strerror (errno));
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goto out_free;
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}
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if (asprintf (&newdir, TCB_DIR "/%s", user_newname) == -1) {
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goto out_free_nomem;
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}
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real_new_dir_rel = shadowtcb_path_rel (user_newname, the_newid);
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if (NULL == real_new_dir_rel) {
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goto out_free;
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}
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if ( (strcmp (real_new_dir, newdir) != 0)
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&& (symlink (real_new_dir_rel, newdir) != 0)) {
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fprintf (shadow_logfd,
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_("%s: Cannot create symbolic link %s: %s\n"),
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Prog, real_new_dir_rel, strerror (errno));
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goto out_free;
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}
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ret = SHADOWTCB_SUCCESS;
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goto out_free;
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out_free_nomem:
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OUT_OF_MEMORY;
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out_free:
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free (olddir);
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free (newdir);
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free (real_old_dir);
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free (real_new_dir);
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free (real_old_dir_rel);
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free (real_new_dir_rel);
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return ret;
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}
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shadowtcb_status shadowtcb_set_user (const char* name)
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{
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char *buf;
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shadowtcb_status retval;
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if (!getdef_bool ("USE_TCB")) {
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return SHADOWTCB_SUCCESS;
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}
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if (NULL != stored_tcb_user) {
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free (stored_tcb_user);
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}
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stored_tcb_user = strdup (name);
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if (NULL == stored_tcb_user) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if (asprintf (&buf, TCB_FMT, name) == -1) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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retval = (spw_setdbname (buf) != 0) ? SHADOWTCB_SUCCESS : SHADOWTCB_FAILURE;
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free (buf);
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return retval;
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}
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/* tcb directory must be empty before shadowtcb_remove is called. */
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shadowtcb_status shadowtcb_remove (const char *name)
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{
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shadowtcb_status ret = SHADOWTCB_SUCCESS;
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char *path = shadowtcb_path_existing (name);
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char *rel = shadowtcb_path_rel_existing (name);
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if ((NULL == path) || (NULL == rel) || (rmdir (path) != 0)) {
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return SHADOWTCB_FAILURE;
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}
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if (rmdir_leading (rel) == SHADOWTCB_FAILURE) {
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return SHADOWTCB_FAILURE;
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}
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free (path);
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free (rel);
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if (asprintf (&path, TCB_DIR "/%s", name) == -1) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if ((unlink (path) != 0) && (errno != ENOENT)) {
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ret = SHADOWTCB_FAILURE;
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}
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free (path);
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return ret;
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}
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shadowtcb_status shadowtcb_move (/*@NULL@*/const char *user_newname, uid_t user_newid)
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{
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struct stat dirmode, filemode;
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char *tcbdir, *shadow;
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shadowtcb_status ret = SHADOWTCB_FAILURE;
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if (!getdef_bool ("USE_TCB")) {
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return SHADOWTCB_SUCCESS;
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}
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if (NULL == stored_tcb_user) {
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return SHADOWTCB_FAILURE;
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}
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if (NULL == user_newname) {
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user_newname = stored_tcb_user;
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}
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if (move_dir (user_newname, user_newid) == SHADOWTCB_FAILURE) {
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return SHADOWTCB_FAILURE;
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}
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if (-1 == user_newid) {
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return SHADOWTCB_SUCCESS;
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}
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if ( (asprintf (&tcbdir, TCB_DIR "/%s", user_newname) == -1)
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|| (asprintf (&shadow, TCB_FMT, user_newname) == -1)) {
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OUT_OF_MEMORY;
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return SHADOWTCB_FAILURE;
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}
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if (stat (tcbdir, &dirmode) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot stat %s: %s\n"),
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Prog, tcbdir, strerror (errno));
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goto out_free;
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}
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if (chown (tcbdir, 0, 0) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot change owners of %s: %s\n"),
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Prog, tcbdir, strerror (errno));
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goto out_free;
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}
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if (chmod (tcbdir, 0700) != 0) {
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fprintf (shadow_logfd,
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_("%s: Cannot change mode of %s: %s\n"),
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Prog, tcbdir, strerror (errno));
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goto out_free;
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}
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if (lstat (shadow, &filemode) != 0) {
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if (errno != ENOENT) {
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fprintf (shadow_logfd,
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_("%s: Cannot lstat %s: %s\n"),
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Prog, shadow, strerror (errno));
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goto out_free;
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}
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fprintf (shadow_logfd,
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_("%s: Warning, user %s has no tcb shadow file.\n"),
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Prog, user_newname);
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} else {
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if (!S_ISREG (filemode.st_mode) ||
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filemode.st_nlink != 1) {
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fprintf (shadow_logfd,
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_("%s: Emergency: %s's tcb shadow is not a "
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"regular file with st_nlink=1.\n"
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"The account is left locked.\n"),
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Prog, user_newname);
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goto out_free;
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}
|
|
if (chown (shadow, user_newid, filemode.st_gid) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change owner of %s: %s\n"),
|
|
Prog, shadow, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if (chmod (shadow, filemode.st_mode & 07777) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change mode of %s: %s\n"),
|
|
Prog, shadow, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
}
|
|
if (unlink_suffs (user_newname) == SHADOWTCB_FAILURE) {
|
|
goto out_free;
|
|
}
|
|
if (chown (tcbdir, user_newid, dirmode.st_gid) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change owner of %s: %s\n"),
|
|
Prog, tcbdir, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if (chmod (tcbdir, dirmode.st_mode & 07777) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change mode of %s: %s\n"),
|
|
Prog, tcbdir, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
ret = SHADOWTCB_SUCCESS;
|
|
out_free:
|
|
free (tcbdir);
|
|
free (shadow);
|
|
return ret;
|
|
}
|
|
|
|
shadowtcb_status shadowtcb_create (const char *name, uid_t uid)
|
|
{
|
|
char *dir, *shadow;
|
|
struct stat tcbdir_stat;
|
|
gid_t shadowgid, authgid;
|
|
struct group *gr;
|
|
int fd;
|
|
shadowtcb_status ret = SHADOWTCB_FAILURE;
|
|
|
|
if (!getdef_bool ("USE_TCB")) {
|
|
return SHADOWTCB_SUCCESS;
|
|
}
|
|
if (stat (TCB_DIR, &tcbdir_stat) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot stat %s: %s\n"),
|
|
Prog, TCB_DIR, strerror (errno));
|
|
return SHADOWTCB_FAILURE;
|
|
}
|
|
shadowgid = tcbdir_stat.st_gid;
|
|
authgid = shadowgid;
|
|
if (getdef_bool ("TCB_AUTH_GROUP")) {
|
|
gr = getgrnam ("auth");
|
|
if (NULL != gr) {
|
|
authgid = gr->gr_gid;
|
|
}
|
|
}
|
|
|
|
if ( (asprintf (&dir, TCB_DIR "/%s", name) == -1)
|
|
|| (asprintf (&shadow, TCB_FMT, name) == -1)) {
|
|
OUT_OF_MEMORY;
|
|
return SHADOWTCB_FAILURE;
|
|
}
|
|
if (mkdir (dir, 0700) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: mkdir: %s: %s\n"),
|
|
Prog, dir, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
fd = open (shadow, O_RDWR | O_CREAT | O_TRUNC, 0600);
|
|
if (fd < 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot open %s: %s\n"),
|
|
Prog, shadow, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
close (fd);
|
|
if (chown (shadow, 0, authgid) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change owner of %s: %s\n"),
|
|
Prog, shadow, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if (chmod (shadow, (mode_t) ((authgid == shadowgid) ? 0600 : 0640)) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change mode of %s: %s\n"),
|
|
Prog, shadow, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if (chown (dir, 0, authgid) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change owner of %s: %s\n"),
|
|
Prog, dir, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if (chmod (dir, (mode_t) ((authgid == shadowgid) ? 02700 : 02710)) != 0) {
|
|
fprintf (shadow_logfd,
|
|
_("%s: Cannot change mode of %s: %s\n"),
|
|
Prog, dir, strerror (errno));
|
|
goto out_free;
|
|
}
|
|
if ( (shadowtcb_set_user (name) == SHADOWTCB_FAILURE)
|
|
|| (shadowtcb_move (NULL, uid) == SHADOWTCB_FAILURE)) {
|
|
goto out_free;
|
|
}
|
|
ret = SHADOWTCB_SUCCESS;
|
|
out_free:
|
|
free (dir);
|
|
free (shadow);
|
|
return ret;
|
|
}
|
|
|