/*
* Copyright (c) 1996, 1998-2005, 2007-2013
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <limits.h>
#include <pwd.h>
#include <grp.h>
#include "sudoers.h"
#include "pwutil.h"
#ifndef LOGIN_NAME_MAX
# ifdef _POSIX_LOGIN_NAME_MAX
# define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX
# else
# define LOGIN_NAME_MAX 9
# endif
#endif /* LOGIN_NAME_MAX */
#define FIELD_SIZE(src, name, size) \
do { \
if (src->name) { \
size = strlen(src->name) + 1; \
total += size; \
} \
} while (0)
#define FIELD_COPY(src, dst, name, size) \
do { \
if (src->name) { \
memcpy(cp, src->name, size); \
dst->name = cp; \
cp += size; \
} \
} while (0)
/*
* Dynamically allocate space for a struct item plus the key and data
* elements. If name is non-NULL it is used as the key, else the
* uid is the key. Fills in datum from struct password.
*/
struct cache_item *
sudo_make_pwitem(uid_t uid, const char *name)
{
char *cp;
const char *pw_shell;
size_t nsize, psize, csize, gsize, dsize, ssize, total;
struct cache_item_pw *pwitem;
struct passwd *pw, *newpw;
debug_decl(sudo_make_pwitem, SUDO_DEBUG_NSS)
/* Look up by name or uid. */
pw = name ? getpwnam(name) : getpwuid(uid);
if (pw == NULL)
debug_return_ptr(NULL);
/* If shell field is empty, expand to _PATH_BSHELL. */
pw_shell = (pw->pw_shell == NULL || pw->pw_shell[0] == '\0')
? _PATH_BSHELL : pw->pw_shell;
/* Allocate in one big chunk for easy freeing. */
nsize = psize = csize = gsize = dsize = ssize = 0;
total = sizeof(*pwitem);
FIELD_SIZE(pw, pw_name, nsize);
FIELD_SIZE(pw, pw_passwd, psize);
#ifdef HAVE_LOGIN_CAP_H
FIELD_SIZE(pw, pw_class, csize);
#endif
FIELD_SIZE(pw, pw_gecos, gsize);
FIELD_SIZE(pw, pw_dir, dsize);
/* Treat shell specially since we expand "" -> _PATH_BSHELL */
ssize = strlen(pw_shell) + 1;
total += ssize;
if (name != NULL)
total += strlen(name) + 1;
/* Allocate space for struct item, struct passwd and the strings. */
pwitem = ecalloc(1, total);
newpw = &pwitem->pw;
/*
* Copy in passwd contents and make strings relative to space
* at the end of the struct.
*/
memcpy(newpw, pw, sizeof(*pw));
cp = (char *)(pwitem + 1);
FIELD_COPY(pw, newpw, pw_name, nsize);
FIELD_COPY(pw, newpw, pw_passwd, psize);
#ifdef HAVE_LOGIN_CAP_H
FIELD_COPY(pw, newpw, pw_class, csize);
#endif
FIELD_COPY(pw, newpw, pw_gecos, gsize);
FIELD_COPY(pw, newpw, pw_dir, dsize);
/* Treat shell specially since we expand "" -> _PATH_BSHELL */
memcpy(cp, pw_shell, ssize);
newpw->pw_shell = cp;
cp += ssize;
/* Set key and datum. */
if (name != NULL) {
memcpy(cp, name, strlen(name) + 1);
pwitem->cache.k.name = cp;
} else {
pwitem->cache.k.uid = pw->pw_uid;
}
pwitem->cache.d.pw = newpw;
pwitem->cache.refcnt = 1;
debug_return_ptr(&pwitem->cache);
}
/*
* Dynamically allocate space for a struct item plus the key and data
* elements. If name is non-NULL it is used as the key, else the
* gid is the key. Fills in datum from struct group.
*/
struct cache_item *
sudo_make_gritem(gid_t gid, const char *name)
{
char *cp;
size_t nsize, psize, nmem, total, len;
struct cache_item_gr *gritem;
struct group *gr, *newgr;
debug_decl(sudo_make_gritem, SUDO_DEBUG_NSS)
/* Look up by name or gid. */
gr = name ? getgrnam(name) : getgrgid(gid);
if (gr == NULL)
debug_return_ptr(NULL);
/* Allocate in one big chunk for easy freeing. */
nsize = psize = nmem = 0;
total = sizeof(*gritem);
FIELD_SIZE(gr, gr_name, nsize);
FIELD_SIZE(gr, gr_passwd, psize);
if (gr->gr_mem) {
for (nmem = 0; gr->gr_mem[nmem] != NULL; nmem++)
total += strlen(gr->gr_mem[nmem]) + 1;
nmem++;
total += sizeof(char *) * nmem;
}
if (name != NULL)
total += strlen(name) + 1;
gritem = ecalloc(1, total);
/*
* Copy in group contents and make strings relative to space
* at the end of the buffer. Note that gr_mem must come
* immediately after struct group to guarantee proper alignment.
*/
newgr = &gritem->gr;
memcpy(newgr, gr, sizeof(*gr));
cp = (char *)(gritem + 1);
if (gr->gr_mem) {
newgr->gr_mem = (char **)cp;
cp += sizeof(char *) * nmem;
for (nmem = 0; gr->gr_mem[nmem] != NULL; nmem++) {
len = strlen(gr->gr_mem[nmem]) + 1;
memcpy(cp, gr->gr_mem[nmem], len);
newgr->gr_mem[nmem] = cp;
cp += len;
}
newgr->gr_mem[nmem] = NULL;
}
FIELD_COPY(gr, newgr, gr_passwd, psize);
FIELD_COPY(gr, newgr, gr_name, nsize);
/* Set key and datum. */
if (name != NULL) {
memcpy(cp, name, strlen(name) + 1);
gritem->cache.k.name = cp;
} else {
gritem->cache.k.gid = gr->gr_gid;
}
gritem->cache.d.gr = newgr;
gritem->cache.refcnt = 1;
debug_return_ptr(&gritem->cache);
}
/*
* Dynamically allocate space for a struct item plus the key and data
* elements. Fills in datum from user_gids or from getgrouplist(3).
*/
struct cache_item *
sudo_make_grlist_item(struct passwd *pw, char * const *unused1,
char * const *unused2)
{
char *cp;
size_t i, nsize, ngroups, total, len;
struct cache_item_grlist *grlitem;
struct group_list *grlist;
GETGROUPS_T *gids;
struct group *grp;
int ngids, groupname_len;
debug_decl(sudo_make_grlist_item, SUDO_DEBUG_NSS)
if (pw == sudo_user.pw && sudo_user.gids != NULL) {
gids = user_gids;
ngids = user_ngids;
user_gids = NULL;
user_ngids = 0;
} else {
if (sudo_user.max_groups > 0) {
ngids = sudo_user.max_groups;
gids = emalloc2(ngids, sizeof(GETGROUPS_T));
(void)getgrouplist(pw->pw_name, pw->pw_gid, gids, &ngids);
} else {
#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
ngids = (int)sysconf(_SC_NGROUPS_MAX) * 2;
if (ngids < 0)
#endif
ngids = NGROUPS_MAX * 2;
gids = emalloc2(ngids, sizeof(GETGROUPS_T));
if (getgrouplist(pw->pw_name, pw->pw_gid, gids, &ngids) == -1) {
efree(gids);
gids = emalloc2(ngids, sizeof(GETGROUPS_T));
if (getgrouplist(pw->pw_name, pw->pw_gid, gids, &ngids) == -1)
ngids = -1;
}
}
}
if (ngids <= 0) {
efree(gids);
debug_return_ptr(NULL);
}
#ifdef HAVE_SETAUTHDB
aix_setauthdb((char *) pw->pw_name);
#endif
#if defined(HAVE_SYSCONF) && defined(_SC_LOGIN_NAME_MAX)
groupname_len = MAX((int)sysconf(_SC_LOGIN_NAME_MAX), 32);
#else
groupname_len = MAX(LOGIN_NAME_MAX, 32);
#endif
/* Allocate in one big chunk for easy freeing. */
nsize = strlen(pw->pw_name) + 1;
total = sizeof(*grlitem) + nsize;
total += sizeof(char *) * ngids;
total += sizeof(gid_t *) * ngids;
total += groupname_len * ngids;
again:
grlitem = ecalloc(1, total);
/*
* Copy in group list and make pointers relative to space
* at the end of the buffer. Note that the groups array must come
* immediately after struct group to guarantee proper alignment.
*/
grlist = &grlitem->grlist;
cp = (char *)(grlitem + 1);
grlist->groups = (char **)cp;
cp += sizeof(char *) * ngids;
grlist->gids = (gid_t *)cp;
cp += sizeof(gid_t) * ngids;
/* Set key and datum. */
memcpy(cp, pw->pw_name, nsize);
grlitem->cache.k.name = cp;
grlitem->cache.d.grlist = grlist;
grlitem->cache.refcnt = 1;
cp += nsize;
/*
* Store group IDs.
*/
for (i = 0; i < ngids; i++)
grlist->gids[i] = gids[i];
grlist->ngids = ngids;
/*
* Resolve and store group names by ID.
*/
ngroups = 0;
for (i = 0; i < ngids; i++) {
if ((grp = sudo_getgrgid(gids[i])) != NULL) {
len = strlen(grp->gr_name) + 1;
if (cp - (char *)grlitem + len > total) {
total += len + groupname_len;
efree(grlitem);
sudo_gr_delref(grp);
goto again;
}
memcpy(cp, grp->gr_name, len);
grlist->groups[ngroups++] = cp;
cp += len;
sudo_gr_delref(grp);
}
}
grlist->ngroups = ngroups;
efree(gids);
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
debug_return_ptr(&grlitem->cache);
}
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