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freebsd/usr.bin/id/id.c
Brooks Davis 54404cfb13 In preparation for raising NGROUPS and NGROUPS_MAX, change base
system callers of getgroups(), getgrouplist(), and setgroups() to
allocate buffers dynamically.  Specifically, allocate a buffer of size
sysconf(_SC_NGROUPS_MAX)+1 (+2 in a few cases to allow for overflow).

This (or similar gymnastics) is required for the code to actually follow
the POSIX.1-2008 specification where {NGROUPS_MAX} may differ at runtime
and where getgroups may return {NGROUPS_MAX}+1 results on systems like
FreeBSD which include the primary group.

In id(1), don't pointlessly add the primary group to the list of all
groups, it is always the first result from getgroups().  In principle
the old code was more portable, but this was only done in one of the two
places where getgroups() was called to the overall effect was pointless.

Document the actual POSIX requirements in the getgroups(2) and
setgroups(2) manpages.  We do not yet support a dynamic NGROUPS, but we
may in the future.

MFC after:	2 weeks
2009-06-19 15:58:24 +00:00

489 lines
10 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)id.c 8.2 (Berkeley) 2/16/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mac.h>
#ifdef USE_BSM_AUDIT
#include <bsm/audit.h>
#endif
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void id_print(struct passwd *, int, int, int);
void pline(struct passwd *);
void pretty(struct passwd *);
void auditid(void);
void group(struct passwd *, int);
void maclabel(void);
void usage(void);
struct passwd *who(char *);
int isgroups, iswhoami;
int
main(int argc, char *argv[])
{
struct group *gr;
struct passwd *pw;
int Gflag, Mflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
int Aflag;
const char *myname;
Gflag = Mflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
Aflag = 0;
myname = strrchr(argv[0], '/');
myname = (myname != NULL) ? myname + 1 : argv[0];
if (strcmp(myname, "groups") == 0) {
isgroups = 1;
Gflag = nflag = 1;
}
else if (strcmp(myname, "whoami") == 0) {
iswhoami = 1;
uflag = nflag = 1;
}
while ((ch = getopt(argc, argv,
(isgroups || iswhoami) ? "" : "APGMagnpru")) != -1)
switch(ch) {
#ifdef USE_BSM_AUDIT
case 'A':
Aflag = 1;
break;
#endif
case 'G':
Gflag = 1;
break;
case 'M':
Mflag = 1;
break;
case 'P':
Pflag = 1;
break;
case 'a':
break;
case 'g':
gflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'u':
uflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (iswhoami && argc > 0)
usage();
switch(Aflag + Gflag + Mflag + Pflag + gflag + pflag + uflag) {
case 1:
break;
case 0:
if (!nflag && !rflag)
break;
/* FALLTHROUGH */
default:
usage();
}
pw = *argv ? who(*argv) : NULL;
if (Mflag && pw != NULL)
usage();
#ifdef USE_BSM_AUDIT
if (Aflag) {
auditid();
exit(0);
}
#endif
if (gflag) {
id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
if (nflag && (gr = getgrgid(id)))
(void)printf("%s\n", gr->gr_name);
else
(void)printf("%u\n", id);
exit(0);
}
if (uflag) {
id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
if (nflag && (pw = getpwuid(id)))
(void)printf("%s\n", pw->pw_name);
else
(void)printf("%u\n", id);
exit(0);
}
if (Gflag) {
group(pw, nflag);
exit(0);
}
if (Mflag) {
maclabel();
exit(0);
}
if (Pflag) {
pline(pw);
exit(0);
}
if (pflag) {
pretty(pw);
exit(0);
}
if (pw) {
id_print(pw, 1, 0, 0);
}
else {
id = getuid();
pw = getpwuid(id);
id_print(pw, 0, 1, 1);
}
exit(0);
}
void
pretty(struct passwd *pw)
{
struct group *gr;
u_int eid, rid;
char *login;
if (pw) {
(void)printf("uid\t%s\n", pw->pw_name);
(void)printf("groups\t");
group(pw, 1);
} else {
if ((login = getlogin()) == NULL)
err(1, "getlogin");
pw = getpwuid(rid = getuid());
if (pw == NULL || strcmp(login, pw->pw_name))
(void)printf("login\t%s\n", login);
if (pw)
(void)printf("uid\t%s\n", pw->pw_name);
else
(void)printf("uid\t%u\n", rid);
if ((eid = geteuid()) != rid) {
if ((pw = getpwuid(eid)))
(void)printf("euid\t%s\n", pw->pw_name);
else
(void)printf("euid\t%u\n", eid);
}
if ((rid = getgid()) != (eid = getegid())) {
if ((gr = getgrgid(rid)))
(void)printf("rgid\t%s\n", gr->gr_name);
else
(void)printf("rgid\t%u\n", rid);
}
(void)printf("groups\t");
group(NULL, 1);
}
}
void
id_print(struct passwd *pw, int use_ggl, int p_euid, int p_egid)
{
struct group *gr;
gid_t gid, egid, lastgid;
uid_t uid, euid;
int cnt, ngroups;
long ngroups_max;
gid_t *groups;
const char *fmt;
if (pw != NULL) {
uid = pw->pw_uid;
gid = pw->pw_gid;
}
else {
uid = getuid();
gid = getgid();
}
ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
err(1, "malloc");
if (use_ggl && pw != NULL) {
ngroups = ngroups_max;
getgrouplist(pw->pw_name, gid, groups, &ngroups);
}
else {
ngroups = getgroups(ngroups_max, groups);
}
if (pw != NULL)
printf("uid=%u(%s)", uid, pw->pw_name);
else
printf("uid=%u", getuid());
printf(" gid=%u", gid);
if ((gr = getgrgid(gid)))
(void)printf("(%s)", gr->gr_name);
if (p_euid && (euid = geteuid()) != uid) {
(void)printf(" euid=%u", euid);
if ((pw = getpwuid(euid)))
(void)printf("(%s)", pw->pw_name);
}
if (p_egid && (egid = getegid()) != gid) {
(void)printf(" egid=%u", egid);
if ((gr = getgrgid(egid)))
(void)printf("(%s)", gr->gr_name);
}
fmt = " groups=%u";
for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
if (lastgid == (gid = groups[cnt]))
continue;
printf(fmt, gid);
fmt = ",%u";
if ((gr = getgrgid(gid)))
printf("(%s)", gr->gr_name);
lastgid = gid;
}
printf("\n");
free(groups);
}
#ifdef USE_BSM_AUDIT
void
auditid(void)
{
auditinfo_t auditinfo;
auditinfo_addr_t ainfo_addr;
int ret, extended;
extended = 0;
ret = getaudit(&auditinfo);
if (ret < 0 && errno == E2BIG) {
if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0)
err(1, "getaudit_addr");
extended = 1;
} else if (ret < 0)
err(1, "getaudit");
if (extended != 0) {
(void) printf("auid=%d\n"
"mask.success=0x%08x\n"
"mask.failure=0x%08x\n"
"asid=%d\n"
"termid_addr.port=0x%08x\n"
"termid_addr.addr[0]=0x%08x\n"
"termid_addr.addr[1]=0x%08x\n"
"termid_addr.addr[2]=0x%08x\n"
"termid_addr.addr[3]=0x%08x\n",
ainfo_addr.ai_auid, ainfo_addr.ai_mask.am_success,
ainfo_addr.ai_mask.am_failure, ainfo_addr.ai_asid,
ainfo_addr.ai_termid.at_port,
ainfo_addr.ai_termid.at_addr[0],
ainfo_addr.ai_termid.at_addr[1],
ainfo_addr.ai_termid.at_addr[2],
ainfo_addr.ai_termid.at_addr[3]);
} else {
(void) printf("auid=%d\n"
"mask.success=0x%08x\n"
"mask.failure=0x%08x\n"
"asid=%d\n"
"termid.port=0x%08x\n"
"termid.machine=0x%08x\n",
auditinfo.ai_auid, auditinfo.ai_mask.am_success,
auditinfo.ai_mask.am_failure,
auditinfo.ai_asid, auditinfo.ai_termid.port,
auditinfo.ai_termid.machine);
}
}
#endif
void
group(struct passwd *pw, int nflag)
{
struct group *gr;
int cnt, id, lastid, ngroups;
long ngroups_max;
gid_t *groups;
const char *fmt;
ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
if ((groups = malloc(sizeof(gid_t) * (ngroups_max))) == NULL)
err(1, "malloc");
if (pw) {
ngroups = ngroups_max;
(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
} else {
ngroups = getgroups(ngroups_max, groups);
}
fmt = nflag ? "%s" : "%u";
for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
if (lastid == (id = groups[cnt]))
continue;
if (nflag) {
if ((gr = getgrgid(id)))
(void)printf(fmt, gr->gr_name);
else
(void)printf(*fmt == ' ' ? " %u" : "%u",
id);
fmt = " %s";
} else {
(void)printf(fmt, id);
fmt = " %u";
}
lastid = id;
}
(void)printf("\n");
free(groups);
}
void
maclabel(void)
{
char *string;
mac_t label;
int error;
error = mac_prepare_process_label(&label);
if (error == -1)
errx(1, "mac_prepare_type: %s", strerror(errno));
error = mac_get_proc(label);
if (error == -1)
errx(1, "mac_get_proc: %s", strerror(errno));
error = mac_to_text(label, &string);
if (error == -1)
errx(1, "mac_to_text: %s", strerror(errno));
(void)printf("%s\n", string);
mac_free(label);
free(string);
}
struct passwd *
who(char *u)
{
struct passwd *pw;
long id;
char *ep;
/*
* Translate user argument into a pw pointer. First, try to
* get it as specified. If that fails, try it as a number.
*/
if ((pw = getpwnam(u)))
return(pw);
id = strtol(u, &ep, 10);
if (*u && !*ep && (pw = getpwuid(id)))
return(pw);
errx(1, "%s: no such user", u);
/* NOTREACHED */
}
void
pline(struct passwd *pw)
{
if (!pw) {
if ((pw = getpwuid(getuid())) == NULL)
err(1, "getpwuid");
}
(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
pw->pw_dir, pw->pw_shell);
}
void
usage(void)
{
if (isgroups)
(void)fprintf(stderr, "usage: groups [user]\n");
else if (iswhoami)
(void)fprintf(stderr, "usage: whoami\n");
else
(void)fprintf(stderr, "%s\n%s%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: id [user]",
#ifdef USE_BSM_AUDIT
" id -A\n",
#else
"",
#endif
" id -G [-n] [user]",
" id -M",
" id -P [user]",
" id -g [-nr] [user]",
" id -p [user]",
" id -u [-nr] [user]");
exit(1);
}