Passwd and group lookup routines for testsudoers that support alternate
passwd and group files.
This commit is contained in:
Todd C. Miller
410
tsgetgrpw.c
Normal file
410
tsgetgrpw.c
Normal file
@@ -0,0 +1,410 @@
|
||||
/*
|
||||
* Copyright (c) 2005 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.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Trivial replacements for the libc get{gr,pw}{uid,nam}() routines
|
||||
* for use by testsudoers in the sudo test harness.
|
||||
* We need our own since many platforms don't provide set{pw,gr}file().
|
||||
*/
|
||||
|
||||
#include <config.h>
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/param.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>
|
||||
#else
|
||||
# ifdef HAVE_STRINGS_H
|
||||
# include <strings.h>
|
||||
# endif
|
||||
#endif /* HAVE_STRING_H */
|
||||
#include <limits.h>
|
||||
#include <pwd.h>
|
||||
#include <grp.h>
|
||||
|
||||
#include "sudo.h"
|
||||
|
||||
#ifndef LINE_MAX
|
||||
# define LINE_MAX 2048
|
||||
#endif
|
||||
|
||||
static const char *pwfile = "/etc/passwd";
|
||||
static FILE *pwf;
|
||||
static int pw_stayopen;
|
||||
|
||||
static FILE *grf;
|
||||
static const char *grfile = "/etc/group";
|
||||
static int gr_stayopen;
|
||||
|
||||
extern VOID *pwcache_get __P((enum cmptype, VOID *));
|
||||
extern int pwcache_put __P((enum cmptype, VOID *));
|
||||
extern struct passwd *sudo_pwdup __P((const struct passwd *));
|
||||
extern struct group *sudo_grdup __P((const struct group *));
|
||||
|
||||
void
|
||||
sudo_setpwfile(file)
|
||||
const char *file;
|
||||
{
|
||||
pwfile = file;
|
||||
if (pwf != NULL)
|
||||
sudo_endpwent();
|
||||
}
|
||||
|
||||
void
|
||||
sudo_setpwent()
|
||||
{
|
||||
if (pwf == NULL)
|
||||
pwf = fopen(pwfile, "r");
|
||||
else
|
||||
rewind(pwf);
|
||||
pw_stayopen = 1;
|
||||
}
|
||||
|
||||
void
|
||||
sudo_endpwent()
|
||||
{
|
||||
if (pwf != NULL) {
|
||||
fclose(pwf);
|
||||
pwf = NULL;
|
||||
}
|
||||
pw_stayopen = 0;
|
||||
}
|
||||
|
||||
struct passwd *
|
||||
sudo_getpwnam(name)
|
||||
const char *name;
|
||||
{
|
||||
struct passwd tpw, *pw = NULL;
|
||||
size_t len, nlen;
|
||||
char buf[LINE_MAX], *cp;
|
||||
|
||||
tpw.pw_name = (char *) name;
|
||||
if ((pw = pwcache_get(bypwnam, &tpw)) != NULL)
|
||||
return(pw);
|
||||
|
||||
/* No cached entry, try the passwd file. */
|
||||
if (pwf != NULL)
|
||||
rewind(pwf);
|
||||
else if ((pwf = fopen(pwfile, "r")) == NULL)
|
||||
return(NULL);
|
||||
|
||||
nlen = strlen(name);
|
||||
while (fgets(buf, sizeof(buf), pwf)) {
|
||||
if (strncmp(buf, name, nlen) != 0 || buf[nlen] != ':')
|
||||
continue;
|
||||
if ((tpw.pw_name = strtok(buf, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_passwd = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tpw.pw_uid = atoi(cp);
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tpw.pw_gid = atoi(cp);
|
||||
if ((tpw.pw_gecos = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_dir = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_shell = strtok(NULL, ":")) != NULL) {
|
||||
len = strlen(tpw.pw_shell);
|
||||
if (tpw.pw_shell[len - 1] == '\n')
|
||||
tpw.pw_shell[len - 1] = '\0';
|
||||
}
|
||||
pw = sudo_pwdup(&tpw);
|
||||
break;
|
||||
}
|
||||
if (!pw_stayopen) {
|
||||
fclose(pwf);
|
||||
pwf = NULL;
|
||||
}
|
||||
if (pw != NULL) {
|
||||
if (!pwcache_put(bypwnam, (VOID *) pw))
|
||||
errorx(1, "unable to cache user name, already exists");
|
||||
if (!pwcache_put(byuid, (VOID *) pw))
|
||||
errorx(1, "unable to cache uid, already exists");
|
||||
return(pw);
|
||||
} else {
|
||||
len = strlen(name) + 1;
|
||||
cp = emalloc(sizeof(*pw) + len);
|
||||
memset(cp, 0, sizeof(*pw));
|
||||
pw = (struct passwd *) cp;
|
||||
cp += sizeof(*pw);
|
||||
memcpy(cp, name, len);
|
||||
pw->pw_name = cp;
|
||||
pw->pw_uid = (uid_t) -1;
|
||||
if (!pwcache_put(bypwnam, (VOID *) pw))
|
||||
errorx(1, "unable to cache user name, already exists");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
struct passwd *
|
||||
sudo_getpwuid(uid)
|
||||
uid_t uid;
|
||||
{
|
||||
struct passwd tpw, *pw = NULL;
|
||||
size_t len;
|
||||
char buf[LINE_MAX], *cp;
|
||||
|
||||
tpw.pw_uid = uid;
|
||||
if ((pw = pwcache_get(byuid, &tpw)) != NULL)
|
||||
return(pw);
|
||||
|
||||
/* No cached entry, try the passwd file. */
|
||||
if (pwf != NULL)
|
||||
rewind(pwf);
|
||||
else if ((pwf = fopen(pwfile, "r")) == NULL)
|
||||
return(NULL);
|
||||
|
||||
while (fgets(buf, sizeof(buf), pwf)) {
|
||||
if ((tpw.pw_name = strtok(buf, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_passwd = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tpw.pw_uid = atoi(cp);
|
||||
if (tpw.pw_uid != uid)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tpw.pw_gid = atoi(cp);
|
||||
if ((tpw.pw_gecos = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_dir = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((tpw.pw_shell = strtok(NULL, ":")) != NULL) {
|
||||
len = strlen(tpw.pw_shell);
|
||||
if (tpw.pw_shell[len - 1] == '\n')
|
||||
tpw.pw_shell[len - 1] = '\0';
|
||||
}
|
||||
pw = sudo_pwdup(&tpw);
|
||||
break;
|
||||
}
|
||||
if (!pw_stayopen) {
|
||||
fclose(pwf);
|
||||
pwf = NULL;
|
||||
}
|
||||
if (pw != NULL) {
|
||||
if (!pwcache_put(bypwnam, (VOID *) pw))
|
||||
errorx(1, "unable to cache user name, already exists");
|
||||
if (!pwcache_put(byuid, (VOID *) pw))
|
||||
errorx(1, "unable to cache uid, already exists");
|
||||
return(pw);
|
||||
} else {
|
||||
pw = emalloc(sizeof(*pw));
|
||||
memset(pw, 0, sizeof(*pw));
|
||||
pw->pw_uid = uid;
|
||||
if (!pwcache_put(byuid, (VOID *) pw))
|
||||
errorx(1, "unable to cache uid, already exists");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
char *
|
||||
sudo_getepw(pw)
|
||||
const struct passwd *pw;
|
||||
{
|
||||
return(pw->pw_passwd);
|
||||
}
|
||||
|
||||
void
|
||||
sudo_setgrfile(file)
|
||||
const char *file;
|
||||
{
|
||||
grfile = file;
|
||||
if (grf != NULL)
|
||||
sudo_endgrent();
|
||||
}
|
||||
|
||||
void
|
||||
sudo_setgrent()
|
||||
{
|
||||
if (grf == NULL)
|
||||
grf = fopen(grfile, "r");
|
||||
else
|
||||
rewind(grf);
|
||||
gr_stayopen = 1;
|
||||
}
|
||||
|
||||
void
|
||||
sudo_endgrent()
|
||||
{
|
||||
if (grf != NULL) {
|
||||
fclose(grf);
|
||||
grf = NULL;
|
||||
}
|
||||
gr_stayopen = 0;
|
||||
}
|
||||
|
||||
struct group *
|
||||
sudo_getgrnam(name)
|
||||
const char *name;
|
||||
{
|
||||
struct group tgr, *gr = NULL;
|
||||
size_t len, nlen;
|
||||
char buf[LINE_MAX], *cp, *m;
|
||||
int n;
|
||||
|
||||
tgr.gr_name = (char *) name;
|
||||
if ((gr = pwcache_get(bygrnam, &tgr)) != NULL)
|
||||
return(gr);
|
||||
|
||||
/* No cached entry, try the group file. */
|
||||
if (grf != NULL)
|
||||
rewind(grf);
|
||||
else if ((grf = fopen(grfile, "r")) == NULL)
|
||||
return(NULL);
|
||||
|
||||
nlen = strlen(name);
|
||||
while (fgets(buf, sizeof(buf), grf)) {
|
||||
if (strncmp(buf, name, nlen) != 0 || buf[nlen] != ':')
|
||||
continue;
|
||||
if ((tgr.gr_name = strtok(buf, ":")) == NULL)
|
||||
continue;
|
||||
if ((tgr.gr_passwd = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tgr.gr_gid = atoi(cp);
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
len = strlen(cp);
|
||||
if (cp[len - 1] == '\n')
|
||||
cp[len - 1] = '\0';
|
||||
/* Fill in group members */
|
||||
if (*cp != '\0') {
|
||||
for (n = 1, m = cp; (m = strchr(m, ',')) != NULL; m++, n++)
|
||||
continue;
|
||||
tgr.gr_mem = emalloc2(n + 1, sizeof(char *));
|
||||
n = 0;
|
||||
for ((m = strtok(cp, ",")); m != NULL; (m = strtok(NULL, ",")))
|
||||
tgr.gr_mem[n++] = m;
|
||||
tgr.gr_mem[n++] = NULL;
|
||||
} else
|
||||
tgr.gr_mem = NULL;
|
||||
gr = sudo_grdup(&tgr);
|
||||
if (tgr.gr_mem != NULL)
|
||||
free(tgr.gr_mem);
|
||||
break;
|
||||
}
|
||||
if (!gr_stayopen) {
|
||||
fclose(grf);
|
||||
grf = NULL;
|
||||
}
|
||||
if (gr != NULL) {
|
||||
if (!pwcache_put(bygrnam, (VOID *) gr))
|
||||
errorx(1, "unable to cache group name, already exists");
|
||||
if (!pwcache_put(bygid, (VOID *) gr))
|
||||
errorx(1, "unable to cache gid, already exists");
|
||||
return(gr);
|
||||
} else {
|
||||
len = strlen(name) + 1;
|
||||
cp = emalloc(sizeof(*gr) + len);
|
||||
memset(cp, 0, sizeof(*gr));
|
||||
gr = (struct group *) cp;
|
||||
cp += sizeof(*gr);
|
||||
memcpy(cp, name, len);
|
||||
gr->gr_name = cp;
|
||||
gr->gr_gid = (gid_t) -1;
|
||||
if (!pwcache_put(bygrnam, (VOID *) gr))
|
||||
errorx(1, "unable to cache group name, already exists");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
struct group *
|
||||
sudo_getgrgid(gid)
|
||||
gid_t gid;
|
||||
{
|
||||
struct group tgr, *gr = NULL;
|
||||
size_t len;
|
||||
char buf[LINE_MAX], *cp, *m;
|
||||
int n;
|
||||
|
||||
tgr.gr_gid = gid;
|
||||
if ((gr = pwcache_get(bygid, &tgr)) != NULL)
|
||||
return(gr);
|
||||
|
||||
/* No cached entry, try the group file. */
|
||||
if (grf != NULL)
|
||||
rewind(grf);
|
||||
else if ((grf = fopen(grfile, "r")) == NULL)
|
||||
return(NULL);
|
||||
|
||||
while (fgets(buf, sizeof(buf), grf)) {
|
||||
if ((tgr.gr_name = strtok(buf, ":")) == NULL)
|
||||
continue;
|
||||
if ((tgr.gr_passwd = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
tgr.gr_gid = atoi(cp);
|
||||
if (tgr.gr_gid != gid)
|
||||
continue;
|
||||
if ((cp = strtok(NULL, ":")) == NULL)
|
||||
continue;
|
||||
len = strlen(cp);
|
||||
if (cp[len - 1] == '\n')
|
||||
cp[len - 1] = '\0';
|
||||
/* Fill in group members */
|
||||
if (*cp != '\0') {
|
||||
for (n = 1, m = cp; (m = strchr(m, ',')) != NULL; m++, n++)
|
||||
continue;
|
||||
tgr.gr_mem = emalloc2(n + 1, sizeof(char *));
|
||||
n = 0;
|
||||
for ((m = strtok(cp, ",")); m != NULL; (m = strtok(NULL, ",")))
|
||||
tgr.gr_mem[n++] = m;
|
||||
tgr.gr_mem[n++] = NULL;
|
||||
} else
|
||||
tgr.gr_mem = NULL;
|
||||
gr = sudo_grdup(&tgr);
|
||||
if (tgr.gr_mem != NULL)
|
||||
free(tgr.gr_mem);
|
||||
break;
|
||||
}
|
||||
if (!gr_stayopen) {
|
||||
fclose(grf);
|
||||
grf = NULL;
|
||||
}
|
||||
if (gr != NULL) {
|
||||
if (!pwcache_put(bygrnam, (VOID *) gr))
|
||||
errorx(1, "unable to cache group name, already exists");
|
||||
if (!pwcache_put(bygid, (VOID *) gr))
|
||||
errorx(1, "unable to cache gid, already exists");
|
||||
return(gr);
|
||||
} else {
|
||||
gr = emalloc(sizeof(*gr));
|
||||
memset(gr, 0, sizeof(*gr));
|
||||
gr->gr_gid = gid;
|
||||
if (!pwcache_put(bygid, (VOID *) gr))
|
||||
errorx(1, "unable to cache gid, already exists");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user