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static const char rcsid[] = "$Id: checks.c,v 1.190 2007/03/07 15:04:41 will Exp $";
/* The code should compile with either ANSI C or K&R compilers. */
/*
* Copyright (c) 1993 by California Institute of Technology.
* Written by William Deich. Not derived from licensed software.
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*/
#include "super.h"
#include "version.h"
#include "s_hsearch.h"
#define MAX_KEYLEN 1000 /* Large enough? */
static char keybuf[MAX_KEYLEN];
static char *YES = "Y";
static char *NO = "N";
#ifdef HAVE_INNETGR
/*
#define netgrp_u_compare(pattern, user) innetgr(pattern, NULL, user, NULL)
#define netgrp_h_compare(pattern, host) innetgr(pattern, host, NULL, NULL)
*/
static int created_user_table = 0;
static netgrp_u_compare(pattern, user)
char *pattern;
char *user;
{
ENTRY item, *found_item;
int passed, klen;
if (!created_user_table) {
if (!s_hcreate(HS_USER, 1000)) {
return Error(0, 0,
"%tCouldn't allocate hash table for user ng processing\n");
}
created_user_table = 1;
}
/* Catenate pattern and user for the key such that
* "abc" + "de" is not the same as "ab" + "cde".
* Use "\n", as that will have been stripped from input before we get here.
*/
if (snprintf(keybuf, MAX_KEYLEN, "%s\n%s", pattern, user) >= MAX_KEYLEN) {
return Error(0, 0,
"%tpattern and user too large for user ng processing\n");
}
item.key = keybuf;
if (found_item = s_hsearch(HS_USER, item, FIND)) {
return found_item->data == YES? 1: 0;
}
passed = innetgr(pattern, NULL, user, NULL);
/* Have to make this key a permanent copy for the hash */
klen = strlen(keybuf);
item.key = malloc(klen + 1);
if (!item.key) {
return Error(0, 0,
"%tout of memory for user ng processing\n");
}
strcpy(item.key, keybuf);
item.data = passed? YES: NO;
if (!s_hsearch(HS_USER, item, ENTER)) {
return Error(0, 0,
"%thash set failure for user ng processing\n");
}
return passed;
}
static int created_host_table = 0;
static netgrp_h_compare(pattern, host)
char *pattern;
char *host;
{
ENTRY item, *found_item;
int passed, klen;
if (!created_host_table) {
if (!s_hcreate(HS_HOST, 1000)) {
return Error(0, 0,
"%tCouldn't allocate hash table for host ng processing\n");
}
created_host_table = 1;
}
/* Catenate pattern and user for the key such that
* "abc" + "de" is not the same as "ab" + "cde".
* Use "\n", as that will have been stripped from input before we get here.
*/
if (snprintf(keybuf, MAX_KEYLEN, "%s\n%s", pattern, host) >= MAX_KEYLEN) {
return Error(0, 0,
"%tpattern and host too large for host ng processing\n");
}
item.key = keybuf;
if (found_item = s_hsearch(HS_HOST, item, FIND)) {
return found_item->data == YES? 1: 0;
}
passed = innetgr(pattern, host, NULL, NULL);
/* Have to make this key a permanent copy for the hash */
klen = strlen(keybuf);
item.key = malloc(klen + 1);
if (!item.key) {
return Error(0, 0,
"%tout of memory for host ng processing\n");
}
strcpy(item.key, keybuf);
item.data = passed? YES: NO;
if (!s_hsearch(HS_HOST, item, ENTER)) {
return Error(0, 0,
"%thash set failure for host ng processing\n");
}
return passed;
}
#else
#define netgrp_u_compare(p, u) 0
#define netgrp_h_compare(p, h) 0
#endif
int get_setting P__ (());
#ifdef _HPUX_SOURCE
#ifdef HAVE_ISCOMSEC
char *bigcrypt();
#else
/* If we don't have iscomsec() on this HP system, fake it -- otherwise
* we'll have to #ifdef the use of iscomsec(), and it's cleaner code
* if we don't.
*/
int iscomsec() { return 0; }
#endif
#endif
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Check that an environment variable only includes allowed characters */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Returns 0 if pat matched; -1 otherwise. */
int
checkenv(name, value, pat)
char *name; /* variable name to check (e.g. "TERM") */
char *value; /* contents of variable (e.g. "vt100") */
char *pat; /* pattern that value must match */
{
int len;
if (!value)
return -1;
if (debug)
(void) fprintf(stderr,
"\tcheckenv args: name=\"%s\"; value=\"%s\"; pat=\"%s\"\n",
name, value, pat);
/* Environment variables are always checked with s_re_comp/s_re_exec:
* the patterns are fixed internally, not supplied by the user.
*/
if (s_re_comp(pat)) {
return Error(0, 0,
"%t\n\tcheckenv(): couldn't compile pattern `%-.500s'.\n", pat);
}
if (s_re_exec(value) != 1) {
return Error(0, 0,
"checkenv(): $%.100s (=%.100s) doesn't match pattern %-.500s.\n",
name, value, pat);
}
/* Limit the value to a reasonable length (MAXENVLEN chars) */
len = strlen(value);
if (len > MAXENVLEN) {
return Error(0, 0, "Imported environment variables may not \
exceed %d chars; you passed a string of length %d!\n", MAXENVLEN, len);
}
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Check the checkvar=name,... list.
* If the list isn't empty, use /dev/tty for input.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Returns 0 if list ok; -1 otherwise. */
int
check_var_value()
{
int l, ntry, match;
char buf[500];
char *varname, *truevalue;
int ivar;
FILE *prompt_fp;
char *prompt_dev="/dev/tty";
/* This is implemented as an inefficient operation, but it doesn't
* matter because we _assume_ the number of variables to be small
* and it's only invoked once.
*/
if (!localinfo.checkvar || !localinfo.checkvar[0])
return 0; /* no checkvar list */
if (!(prompt_fp = fopen(prompt_dev, "r+"))) {
return Error(0, 0,
"Can't open %s to test checkvar=name,...\n", prompt_dev);
}
if (localinfo.checkvar[1]) {
/* There must be more than one variable */
fprintf(prompt_fp, "%c%s needs you enter some variables \
before proceeding...\n", toupper(prog[0]), prog+1);
} else {
fprintf(prompt_fp, "%c%s needs you to enter the %s variable \
before proceeding.\n", toupper(prog[0]), prog+1, localinfo.checkvar[0]);
}
for (ivar=0; localinfo.checkvar[ivar]; ivar++) {
varname = localinfo.checkvar[ivar];
truevalue = get_variable(varname);
if (!truevalue) {
/* Ouch, checkvar=xxx is used, but xxx isn't defined! */
fclose(prompt_fp);
return Error(0, 0,
"%t\n\tError in super.tab file: \
`checkvar=%s' is used, but variable %s isn't defined!\n", varname, varname);
}
for (ntry=0, match=0; ntry < MAXTRY && !match; ntry++) {
if (ntry == 0) {
fprintf(prompt_fp, "Enter %s (<Return> for reminder): ",
varname);
} else {
fprintf(prompt_fp, "Enter %s (expecting `%s'): ",
varname, truevalue);
}
fflush(prompt_fp);
if (!fgets(buf, sizeof(buf), prompt_fp)) {
if (feof(prompt_fp)) {
fclose(prompt_fp);
return Error(0, 0, "can't read %s -- stream was closed!\n",
prompt_dev);
} else if (ferror(prompt_fp)) {
fclose(prompt_fp);
return Error(0, 0, "error reading %s\n", prompt_dev);
} else {
fclose(prompt_fp);
return Error(0, 0, "??? feof() and ferror() return 0, \
but I can't read %s\n", prompt_dev);
}
}
if (strlen(buf) == sizeof(buf)-1) {
fclose(prompt_fp);
return Error(0, 0, "Ridiculously long value <%.300s...> \
returned for variable %s\n", buf, varname);
}
l = strlen(buf);
if (buf[l-1] == '\n')
buf[l-1] = '\0';
match = (strcmp(buf, truevalue) == 0);
if (!match) {
fprintf(prompt_fp, "Variable %s incorrect\n", varname);
}
}
if (!match) {
fclose(prompt_fp);
return Error(0, 0, "Never got variable %s entered correctly.\n",
varname);
}
}
fclose(prompt_fp);
/* all variables are ok. */
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Compare a value to a pattern */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Returns 0 if pat matched; -1 otherwise. */
int
check_value(value, pat)
char *value; /* value to check */
char *pat; /* pattern that value must match */
{
if (!value)
return -1;
if (debug)
(void) fprintf(stderr,
"\tcheck_value args: value=\"%s\"; pat=\"%s\"\n",
value, pat);
if (s_re_comp(pat)) {
return Error(0, 0,
"%t\n\tcheck_value(): couldn't compile pattern `%-.500s'.\n", pat);
}
if (s_re_exec(value) != 1) {
return Error(0, 0,
"check_value(): value doesn't match pattern %-.500s.\n", pat);
}
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Option checking -- ensure that options to super are reasonable strings. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Returns 0 if reasonable; -1 otherwise. */
int
checkarg(str)
char *str;
{
int len;
static int optlen_tot = 0; /* running length of all options to super */
/* Limit each option to a reasonable length (MAXOPTLEN chars) */
len = strlen(str);
if (len > MAXOPTLEN) {
return Error(0, 0, "Command-line options may not \
exceed %d chars; you passed a string of length %d!\n", MAXOPTLEN, len);
}
/* Limit the combined option to length MAXOPTLEN_TOT chars */
optlen_tot += len;
if (optlen_tot > MAXOPTLEN_TOT) {
return Error(0, 0, "The total length of command-line options \
may not exceed %d chars!\n", MAXOPTLEN_TOT);
}
/* Ensure the option pattern matches OPT_PATTERN */
if (check_value(str, OPT_PATTERN) != 0)
return -1;
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Look up owner of a file, return uid and gid of owner */
/* Return 0 on success, -1 & print message on failure */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
get_owner(file, uid_p, gid_p)
char *file;
uid_t *uid_p;
gid_t *gid_p;
{
/* Return 0 if file ownership ok; -1 if not ok */
struct stat st;
if (!file || *file == '\0')
return Error(0, 0, "get_owner(): passed null ptr or empty string\n");
if (stat(file, &st) == -1)
return Error(1, 0, "stat() failed on file `%s': ", file);
*uid_p = st.st_uid;
*gid_p = st.st_gid;
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Check ownership of the file */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
check_owner()
{
/* Return 0 if file ownership ok; -1 if not ok */
struct passwd *owner_pw;
if (*localinfo.owner == '\0')
return 0; /* no checks required */
/* Convert desired-owner string to a uid */
owner_pw = getpwentry(1, localinfo.owner);
if (!owner_pw)
return -1;
if (localinfo.file_uid != owner_pw->pw_uid)
return Error(0, 0,
"Actual owner of `%s' is uid %d, but superfile \
requires owner to be %d (%s).\n",
localinfo.progs.cmd_file[localinfo.progs.match].File,
localinfo.file_uid, owner_pw->pw_uid, owner_pw->pw_name);
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Gets an entry from the password file. Optionally accepts special bracketed
* name (e.g. <owner> or <caller>). Accepts names or text uid's.
* Returns ptr to password entry. The password entry may be that returned
* by getpwnam(), or it may be one already stored in a super-owned struct;
* you can't make any assumptions about it -- therefore don't modify it.
*
* The returned pointer points to an area that may be overwritten by later
* calls to the getpwxxx() routines; therefore if the caller wants to save
* the data, the data must be copied.
*
* On error, print message and return NULL.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
struct passwd *
getpwentry(allow_brackets, username)
int allow_brackets; /* allow special names like <caller> */
char *username; /* name to translate */
{
struct passwd *pw;
int l = strlen(username);
if (allow_brackets && username[0] == '<' && username[l-1] == '>') {
/* Translate special name */
if (strcmp(username, "<owner>") == 0) {
if (localinfo.file_uid != UID_NOTSET) {
pw = getpwuid(localinfo.file_uid);
} else {
Error(0, 0,
"%t: getpwentry() Internal Error!\n\tFile owner not yet known!\n");
return NULL;
}
} else if (strcmp(username, "<caller>") == 0) {
pw = &userinfo.caller;
} else {
Error(0, 0, "%t\n\t\tUnknown special name %s\n", username);
return NULL;
}
} else {
/* Regular name or number */
pw = getpwnam(username);
if (!pw) {
char c;
int i, numeric;
numeric = (sscanf(username, "%d%c", &i, &c) == 1);
if (numeric)
pw = getpwuid(i);
}
}
if (!pw) {
Error(0, 0, "%t\n\tNo such user or uid as `%s' in password file.\n",
username);
return NULL;
}
return pw;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Gets a group entry.
* Accepts text gid's or names.
* Returns ptr to group entry.
*
* The returned pointer points to an area that may be overwritten by later
* calls to the getgrxxx() routines; therefore if the caller wants to save
* the data, the data must be copied.
*
* On error, print message and return NULL.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
struct group *
getgrentry(name)
char *name; /* name to translate */
{
struct group *gr;
char c;
int i, numeric;
gr = getgrnam(name);
if (!gr) {
numeric = (sscanf(name, "%d%c", &i, &c) == 1);
if (numeric)
gr = getgrgid(i);
}
if (!gr) {
Error(0, 0, "%t\n\tNo such group or gid as `%s'.\n", name);
return NULL;
}
return gr;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Set supplementary groups according to the specified args */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef HAVE_GETGROUPS
int
set_suppl_groups() { return 0; }
#else
int
set_suppl_groups()
{
GETGROUPS_T *addgroups_p, *groups_p, groups[NGROUPS_MAX];
GETGROUPS_T gotten_groups[NGROUPS_MAX];
int naddgroups, ngroups;
int i;
/* Set the supplementary groups */
if (geteuid() != 0) {
/* Can't set supplementary groups if we've changed to some other uid */
return 0;
}
if (*localinfo.u_g) {
/* Default is to take from that user. (Don't worry if there is no
* such user; it'll get noticed later.) Conflicts with local
* option groups=xxx, which is disallowed.
*/
if (localinfo.ngroups != GROUPS_NOTSET && !localinfo.groups_added)
return Error(0, 0, "%t\n\t\tu+g=xxx conflicts with groups=yyy \
and may not be used in the same entry\n");
initgroups(localinfo.user, userinfo.new_gid);
/* Check for local or global addgroups */
if (localinfo.ngroups != GROUPS_NOTSET) {
addgroups_p = localinfo.groups;
naddgroups = localinfo.ngroups;
} else if (globalinfo.ngroups != GROUPS_NOTSET &&
globalinfo.groups_added) {
addgroups_p = globalinfo.groups;
naddgroups = globalinfo.ngroups;
} else {
addgroups_p = NULL;
naddgroups = 0;
}
ngroups = Getgroups(NGROUPS_MAX, gotten_groups);
if (ngroups == -1)
return Error(1, 0, "%t Getgroups() failed: ");
if (ngroups + naddgroups > NGROUPS_MAX)
return Error(1, 0,
"%t\n\t\taddgroups=xxx adds too many groups.");
for (i = 0; i < ngroups; i++)
groups[i] = gotten_groups[i];
for (groups_p = &groups[ngroups], i=0; i < naddgroups; i++)
*groups_p++ = *addgroups_p++;
ngroups += naddgroups;
} else if (localinfo.ngroups != GROUPS_NOTSET) {
/* There are some explicit local groups=xxx */
if (Setgroups(localinfo.ngroups, localinfo.groups) == -1)
return Error(1, 0, "Failed to set supplementary groups list: ");
} else if (globalinfo.ngroups != GROUPS_NOTSET) {
/* There is an explicit global groups=xxx or addgroups=xxx */
if (Setgroups(globalinfo.ngroups, globalinfo.groups) == -1)
return Error(1, 0, "Failed to set supplementary groups list: ");
} else {
/* Default is no supplementary groups */
if (Setgroups(0, localinfo.groups) == -1)
return Error(1, 0,
"Failed to clear supplementary groups list: ");
}
return 0;
}
#endif
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Set user, group, and supplementary groups according to the specified args */
/* Side effect: if localinfo.user is numeric, change it to a name */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
set_u_g()
{
/* Return 0 on success, -1 on failure */
SETGRENT_T setgrent();
void endgrent();
int i, j, k = -1;
int found_gid = -1, found_egid = -1;
struct passwd *pw = NULL;
int use_setreuid; /* true iff we need to use setreuid() */
int use_setregid; /* true iff we need to use setregid() */
uid_t uid_pw_uid = -1, euid_pw_uid = -1;
gid_t u_g_pw_gid = -1;
char *uid_pw_name = NULL, *euid_pw_name = NULL;
/*
* Start by looking up user id's and group id's. We'll assign
* actual values after we've looked it all up.
*/
/* First, get the group id's specified by {e,}gid=xxx */
if (*localinfo.group) {
found_gid = findgid(1, localinfo.group);
if (found_gid == -1) {
return Error(0, 0,
"%t\n\tCan't set gid: no such group as `%s' in group file.\n",
localinfo.group);
}
}
if (*localinfo.egroup) {
found_egid = findgid(1, localinfo.egroup);
if (found_egid == -1) {
return Error(0, 0,
"%t\n\tCan't set egid: no such group as `%s' in group file.\n",
localinfo.egroup);
}
}
/* Second, get the password entries specified by {e,}uid=xxx, u+g=xxx */
if (*localinfo.u_g && !*localinfo.user) {
/* u+g=zzz was used, but uid=xxx was not. So, set user from u+g. */
strcpy(localinfo.user, localinfo.u_g);
}
if (*localinfo.user) {
pw = getpwentry(1, localinfo.user);
if (!pw)
return -1;
uid_pw_uid = pw->pw_uid;
uid_pw_name = strdup(pw->pw_name);
if (!uid_pw_name)
return Error(0, 0,
"%t\n\tfailed to malloc space for uid_pw_name=<%s>\n", pw->pw_name);
}
if (*localinfo.euser) {
pw = getpwentry(1, localinfo.euser);
if (!pw)
return -1;
euid_pw_uid = pw->pw_uid;
euid_pw_name = strdup(pw->pw_name);
if (!euid_pw_name)
return Error(0, 0,
"%t\n\tfailed to malloc space for euid_pw_name=<%s>\n", pw->pw_name);
}
if (*localinfo.u_g) {
pw = getpwentry(1, localinfo.u_g);
if (!pw)
return -1;
u_g_pw_gid = pw->pw_gid;
}
pw = NULL;
if (*localinfo.group && *localinfo.u_g) {
return Error(0, 0,
"%t\n\tCan't mix options gid=xxx and u+g=yyy in one entry.");
}
/*
* OK, now we have all the uid/gid info. Select uid's and gid's,
* and select the appropriate set of functions to do the assignments.
*/
/* UID defaults: */
userinfo.new_uid = userinfo.caller.pw_uid;
use_setreuid = 0; /* don't have to use setreuid() */
if (*localinfo.euser) {
/* euid=xxx was used */
userinfo.new_euid = euid_pw_uid;
if (strcmp(euid_pw_name, localinfo.euser) != 0) {
/* localinfo.euser must be numeric; convert it to string */
strcpy(localinfo.euser, euid_pw_name);
}
use_setreuid = 1; /* have to use setreuid() */
}
if (*localinfo.user) {
/* uid=xxx or u+g=xxx was used */
userinfo.new_uid = uid_pw_uid;
if (strcmp(uid_pw_name, localinfo.user) != 0) {
/* localinfo.user must be numeric; convert it to string */
strcpy(localinfo.user, uid_pw_name);
}
}
/* GID defaults: */
userinfo.new_gid = userinfo.caller.pw_gid;
use_setregid = 0; /* don't have to use setreuid() */
if (*localinfo.egroup) {
/* egid=xxx was used */
userinfo.new_egid = found_egid;
use_setregid = 1; /* have to use setreuid() */
}
if (*localinfo.group) {
/* gid=xxx was used */
userinfo.new_gid = found_gid;
} else if (*localinfo.u_g) {
userinfo.new_gid = u_g_pw_gid;
}
/* Set supplementary groups */
if (set_suppl_groups() == -1)
return -1;
/* Now set uid & gid */
if (use_setregid) {
#ifdef HAVE_SETREGID
if ((i=setregid(userinfo.new_gid, userinfo.new_egid)) == -1) {
return Error(1, 0, "setregid(gid=%d, egid=%d) failed: ",
userinfo.new_gid, userinfo.new_egid);
} else if ((j=getgid()) != userinfo.new_gid ||
(k=getegid()) != userinfo.new_egid) {
return Error(0, 0,
"setregid(gid=%d,egid=%d) returned 0, but getgid()=%d,getegid()=%d!",
userinfo.new_gid, userinfo.new_egid, j, k);
}
#else
return Error(0, 0, "Can't use egid=xxx option, because this host doesn't offer the setregid() function");
#endif
} else if (*localinfo.group || *localinfo.u_g) {
if ((i=setgid(userinfo.new_gid)) == -1) {
return Error(1, 0, "setgid(gid=%d) failed: ", userinfo.new_gid);
} else if ((j=getgid()) != userinfo.new_gid) {
return Error(0, 0,
"setgid(gid=%d) returned %d, but getgid() returned %d!",
userinfo.new_gid, i, j);
}
}
if (use_setreuid) {
#ifdef HAVE_SETREUID
if ((i=setreuid(userinfo.new_uid, userinfo.new_euid)) == -1) {
return Error(1, 0, "setreuid(uid=%d, euid=%d) failed: ",
userinfo.new_uid, userinfo.new_euid);
} else if ((j=getuid()) != userinfo.new_uid ||
(k=geteuid()) != userinfo.new_euid) {
return Error(1, 0,
"setreuid(uid=%d,euid=%d) returned 0, but getuid()=%d,geteuid()=%d!",
userinfo.new_uid, userinfo.new_euid, j, k);
}
#else
return Error(1, 0, "Can't use euid=xxx option, because this host doesn't offer the setreuid() function");
#endif
} else if (*localinfo.user || *localinfo.u_g) {
if ((i=setuid(userinfo.new_uid)) == -1) {
return Error(1, 0, "setuid(uid=%d) failed: ", userinfo.new_uid);
} else if ((j=getuid()) != userinfo.new_uid) {
return Error(1, 0,
"setuid(uid=%d) returned %d, but getuid() returned %d!",
userinfo.new_uid, i, j);
}
}
if (uid_pw_name)
free(uid_pw_name);
if (euid_pw_name)
free(euid_pw_name);
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Puts the encrypted password in userinfo.encr, and the salt in userinfo.salt.
* Returns 0 on success, -1 on failure to obtain the password.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifdef SUNOS5
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
/* Shadow passwords are always used on Sunos 5.x */
struct spwd *caller_pw;
if (!(caller_pw = getspnam(userinfo.caller.pw_name))) {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain shadow password entry for user %s",
userinfo.caller.pw_name);
return -1;
}
strcpy(userinfo.encr, caller_pw->sp_pwdp);
return get_setting();
}
#endif
#ifdef _HPUX_SOURCE
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
if(iscomsec()) {
struct pr_passwd *caller_pw;
if (!(caller_pw = getprpwnam(userinfo.caller.pw_name))) {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain Trusted Computing Base entry for user %s",
userinfo.caller.pw_name);
return -1;
}
strcpy(userinfo.encr, caller_pw->ufld.fd_encrypt);
} else {
struct passwd *caller_pw;
/* See if we can do shadow password lookup for HPUX 9.x.
* The rule is that if /.secure/etc/passwd exists, we have to use it;
* otherwise, fall through to regular password file lookup.
*/
static struct stat st;
if (stat("/.secure/etc/passwd", &st) == 0) {
/* Shadow password file exists; use it */
struct s_passwd *caller_pw;
if (!(caller_pw = getspwnam(userinfo.caller.pw_name))) {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain shadow password entry for user %s",
userinfo.caller.pw_name);
return -1;
}
strcpy(userinfo.encr, caller_pw->pw_passwd);
} else {
/* Fall through to regular password file lookup. */
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
}
}
return get_setting();
}
#endif
#ifdef SCO
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
struct passwd *caller_pw;
struct spwd *caller_ps;
if (!(caller_pw = getpwnam(userinfo.caller.pw_name))) {
sprintf(authInitMsg1, "No password entry for user %s.\n",
userinfo.caller.pw_name);
return -1;
}
/* SCO 3.2v4 has "x" in password field to indicate shadow password
* file has to be consulted.
*/
if (strcmp(caller_pw->pw_passwd, "x") == 0) {
/* Shadow password in use... */
if (!(caller_ps = getspnam(userinfo.caller.pw_name))) {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain shadow password entry for user %s",
userinfo.caller.pw_name);
return -1;
}
strcpy(userinfo.encr, caller_ps->sp_pwdp);
} else {
/* Fall through to regular password file lookup. */
strcpy(userinfo.encr, caller_pw->pw_passwd);
}
return get_setting();
}
#endif
#ifdef Digital_UNIX
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
struct passwd *caller_pw;
struct pr_passwd *caller_prpass;
if (!(caller_pw = getpwnam(userinfo.caller.pw_name))) {
sprintf(authInitMsg1, "No password entry for user %s.\n",
userinfo.caller.pw_name);
return -1;
}
/* Digital Unix has "x" in password field to indicate shadow password
* file has to be consulted.
*/
if (strcmp(caller_pw->pw_passwd, "x") == 0) {
/* Protected (shadow) password in use... */
if (!(caller_prpass = getprpwnam(userinfo.caller.pw_name))) {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain shadow password entry for user %s",
userinfo.caller.pw_name);
return -1;
}
strcpy(userinfo.encr, caller_prpass->ufld.fd_encrypt);
} else {
/* Fall through to regular password file lookup. */
strcpy(userinfo.encr, caller_pw->pw_passwd);
}
return get_setting();
}
#endif
#ifdef __linux__
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
/* Use /etc/shadow if it exists; else fall back on std */
static struct stat st;
if (stat("/etc/shadow", &st) == 0) {
struct spwd *spwd = 0L;
if (!(spwd = getspnam(userinfo.caller.pw_name))) {
/* Gordon Lack notes: Linux doesn't use the shadow file for NIS
* passwords, so if you get ENOENT or no error, then try the
* local password file.
*/
if (errno == ENOENT || errno == 0) {
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
} else {
authInitErrno = errno;
sprintf(authInitMsg1,
"Failed to obtain shadow password entry for user %s",
userinfo.caller.pw_name);
return -1;
}
} else {
/* got shadow entry */
strcpy(userinfo.encr, spwd->sp_pwdp);
}
} else {
/* Fall through to regular password file lookup. */
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
}
return get_setting();
}
#endif
#ifdef __FreeBSD__
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
/* getpwnam() and getpwuid() will have read the shadow passwd
* if our effective uid == root; no need to use getspnam() or the like.
* But if the encrypted pw is "*", then we didn't get the real pw.
*/
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
if (strcmp(userinfo.encr, "*") == 0) {
sprintf(authInitMsg1, "Can't get encrypted password, \
or there is no password, for user %s", userinfo.caller.pw_name);
return -1;
}
return get_setting();
}
#endif
#ifdef __OpenBSD__
#define HAVE_G_E_PW
int
get_encrypted_pw()
{
/* getpwnam() and getpwuid() will have read the shadow passwd
* if our effective uid == root; no need to use getspnam() or the like.
* But if the encrypted pw is "*", then we didn't get the real pw.
*/
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
if (strcmp(userinfo.encr, "*") == 0) {
sprintf(authInitMsg1, "Can't get encrypted password, \
or there is no password, for user %s", userinfo.caller.pw_name);
return -1;
}
return get_setting();
}
#endif
#ifndef HAVE_G_E_PW
int
get_encrypted_pw()
{
/* Vanilla password file lookup */
strcpy(userinfo.encr, userinfo.caller.pw_passwd);
strncpy(userinfo.salt, userinfo.caller.pw_passwd, 2);
return get_setting();
}
#endif
/*
* Read the userinfo.encr (encrypted passwd field) and pull out the data
* needed for the "salt" or "setting" argument to crypt().
* This version implements the following rule:
* o if encr begins with "$", the entire encr field should be used
* (crypt() will be responsible for extracting the data it needs);
* o otherwise, if encr begins with "_", use the first 9 chars
* (crypt() will discard the leading "_" and use the next 8 characters);
* o otherwise, the salt is the first two chars.
*
* Returns:
* -1 (plus Error()) on failure
* 0 on success.
*/
int
get_setting()
{
if (sizeof(userinfo.salt) <= strlen(userinfo.encr)) {
return Error(0, 0, "Compilation error: the userinfo.salt field is too short (%d chars) to hold a copy of the userinfo.encr field (%d chars) for user %s",
sizeof(userinfo.salt), strlen(userinfo.encr),
userinfo.caller.pw_name);
}
if (userinfo.encr[0] == '$') {
strcpy(userinfo.salt, userinfo.encr);
} else if (userinfo.encr[0] == '_') {
/* crypt() _might_ parse the encr field to pull off the necessary
* salt, but we don't make that assumption.
*/
strncpy(userinfo.salt, userinfo.encr, 9);
userinfo.salt[9] = '\0';
} else {
/* Salt is first two chars. */
strncpy(userinfo.salt, userinfo.encr, 2);
userinfo.salt[2] = '\0';
}
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Returns ptr to string with name of desired authentication method. */
char *
auth_name()
{
if (!localinfo.authinfo.required) {
return "None";
} else if (localinfo.authinfo.method == SUPER_AUTH_PASSWORD) {
return "Password";
} else if (localinfo.authinfo.method == SUPER_AUTH_PAM) {
return "PAM";
} else {
Error(0, 1, "auth_name: don't recognize auth method %d!\n",
localinfo.authinfo.method);
}
/* NOTREACHED */
return "Unknown!"; /* to make gcc -Wall happy... */
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Checks if authentication is needed, and does so if needed.
* Expects that the encrypted password is already in userinfo.{encr,salt},
* so that this can be run after switching to unpriviledged uid.
* Returns 0 on success, -1 on error.
* The timestamp directory faces the same problem as the logfile: if the
* administrator wants to share an NFS-mounted directory across hosts
* on which root is translated to nobody for NFS access, we have to be
* able to create the timestamp file under a special uid. This is done
* just as in open_writer(): we fork, setuid(), and do the file
* manipulation in the child. This allows us to implement a special uid
* for the timestamp file, without needing the operating system to
* offer saved uid's or interprocess file-descriptor passing, etc.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
check_auth(cmd)
char *cmd;
{
char file[MAXPATHLEN];
struct stat st;
int l, istat, file_exists, got_auth, err, timestamp_creatok;
int timed_out = 0;
int status;
pid_t pid, child;
char mkdirMsg[1000];
char *authuser;
if (!localinfo.authinfo.required)
return 0; /* don't need authentication */
if (*authInitMsg1 || *authInitMsg2) {
/* A message was generated during authentication initialization,
* way back before the super.tab file was read. It was only
* relevant if the command required authorization... well, this
* command requires user authentication, so print the message now.
*/
if (*authInitMsg1) {
if (authInitErrno) {
errno = authInitErrno;
Error(1, 0, "%s: ", authInitMsg1);
} else {
Error(0, 0, "%s", authInitMsg1);
}
}
if (*authInitMsg2) {
Error(0, 0, "%s", authInitMsg2);
}
}
/* Create or update the timestamp file even if the lifetime is 0
* (always ask for password). We do this because the user may
* execute _another_ command which has a password expiry > 0,
* and which will be happy to use the password that was already
* entered with the 0-lifetime command.
*/
child = fork();
if (child == -1) {
Error(1, 0, "Failed to create child for timestamp processing: ");
return -1;
} else if (child > 0) {
/* In parent -- wait to see if the child succeeded */
while ((pid = wait(&status)) > 0 && pid != child) {
if (pid == globalinfo.log.pid) {
Error(0, 0,
"Warning: logging process died -- logging to file has stopped.");
globalinfo.log.pid = -1;
} else {
Error(0, 0,
"Wait() surprised! check_pass() received pid %d;\n\t\
expected child pid = %d; waiting for correct pid...\n", pid, child);
}
}
if (pid == -1) {
/* wait() failed */
Error(1, 0, "Waiting for timestamp creation process: ");
return -1;
} else if (status == 0) {
/* child succeeded */
return 0;
} else if (status != 0) {
/* child failed to authenticate user */
Error(0, 0, "Authentication failed\n");
return -1;
}
/* NOTREACHED */
}
/*
* If here, must be in child.
* Unless this command specifies a timeout > 0, don't generate
* error messages if we fail to store timestamp info.
* We'll use exit code 1 for failure to authenticate;
* otherwise we'll exit 0 (success).
*/
if (child != 0) {
Error(0, 1, "Internal error: child=%d; should be 0!\n", child);
}
/*
* setuid, then make and/or test the directory
*/
if (*localinfo.authinfo.ts_user != '\0') {
stringcopy(localinfo.user, localinfo.authinfo.ts_user,
sizeof(localinfo.user));
*localinfo.group = '\0';
*localinfo.u_g = '\0';
if (set_u_g() == -1) {
if (localinfo.authinfo.timeout > 0) {
Error(1, 0,
"failed to setuid to user=%s before setting timestamp file: ",
localinfo.user);
}
exit(2);
}
}
/* Make the timestamp directory name */
timestamp_creatok = 1;
mkdirMsg[0] = '\0';
if (!makedirname(TIMESTAMP_DIR,
globalinfo.authinfo.perhost ? userinfo.hostname : "",
file, &err, mkdirMsg)) {
timestamp_creatok = 0;
if (localinfo.authinfo.timeout > 0 && mkdirMsg[0]) {
if (err) {
errno = err;
Error(1, 0, "Warning: can't record timestamp: %s: ",
mkdirMsg);
} else {
Error(0, 0, "Warning: can't record timestamp: %s",
mkdirMsg);
}
}
}
/* Make the timestamp directory */
if (timestamp_creatok) {
mkdirMsg[0] = '\0';
if (makedir(file, &err, mkdirMsg) == -1) {
timestamp_creatok = 0;
if (localinfo.authinfo.timeout > 0 && mkdirMsg[0]) {
if (err) {
errno = err;
Error(1, 0,
"Warning: can't record timestamp: %s: ",
mkdirMsg);
} else {
Error(0, 0,
"Warning: can't record timestamp: %s",
mkdirMsg);
}
}
}
}
/* Make the file in the timestamp directory */
if (timestamp_creatok) {
l = strlen(file) + 1 + strlen(userinfo.caller.pw_name);
if (l >= MAXPATHLEN) {
if (localinfo.authinfo.timeout > 0) {
Error(1, 0,
"Can't create timestamp file: would exceed MAXPATHLEN = %d\n",
MAXPATHLEN);
}
timestamp_creatok = 0;
}
}
if (timestamp_creatok) {
strcat(file, "/");
strcat(file, userinfo.caller.pw_name);
istat = stat(file, &st);
if (istat != 0 && errno != ENOENT) {
if (localinfo.authinfo.timeout > 0) {
Error(1, 0, "Failed to stat timestamp file `%s': ", file);
}
timestamp_creatok = 0;
}
}
if (timestamp_creatok) {
file_exists = (istat == 0);
if (file_exists) {
timed_out = (localinfo.authinfo.timeout < 1) ||
((time(NULL)-st.st_mtime) >
localinfo.authinfo.timeout*60);
}
}
got_auth=0;
if (localinfo.authinfo.user[0]) {
authuser = localinfo.authinfo.user; /* authuser=xxx local opt */
} else if (globalinfo.authinfo.user[0]) {
authuser = globalinfo.authinfo.user; /* authuser=xxx global opt */
} else {
authuser = userinfo.caller.pw_name; /* default: caller's pw */
}
if (!timestamp_creatok || !file_exists || timed_out) {
switch (localinfo.authinfo.method) {
case SUPER_AUTH_PASSWORD:
got_auth = (get_password(cmd, userinfo.caller.pw_name, authuser,
userinfo.salt, userinfo.encr) == 1);
break;
case SUPER_AUTH_PAM:
#if WITH_PAM
got_auth = (get_pam(cmd, userinfo.caller.pw_name, authuser) == 1);
#else
Error(0, 1, "Auth method is PAM, but this copy of super \
was compiled without PAM support!");
#endif
break;
default:
Error(0, 1, "Internal error in check_auth: \
unknown auth method %d!\n", localinfo.authinfo.method);
}
if (!got_auth)
return -1;
}
/* NOTE: A race condition is possible between two super's, with the
* worst-case effect of an error message and failure to run the
* requested command.
*/
/* If file exists, and we haven't (a) gotten the password again, or
* (b) supposed to automatically refresh the timestamp, do nothing to
* the file except ensure that we own it.
* Otherwise create the file (unlink it first if it exists).
*/
if (!timestamp_creatok) {
/* do nothing: we failed in setting up the timestamp file,
* so don't try to update it.
*/
} else if (file_exists && !(got_auth || localinfo.authinfo.renewtime)) {
if (st.st_uid != geteuid())
return Error(0, 0,
"Timestamp file `%s' is owned by uid=%d, but expected owner=%d.\n\
\tN.B. If you recently changed the value of timestampuid=xxx, all existing\n\
\tfiles in the timestamp directory _may_ have the wrong owner; delete them.\n\
\t(No security hole appears when you delete a timestamp file.)\n",
file, st.st_uid, geteuid());
} else {
if (file_exists) {
if (unlink(file) != 0)
return Error(1, 0,
"Failed to unlink() timestamp file `%s': ", file);
}
if (open(file, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0200) == -1)
return Error(1, 0,
"Failed to open() timestamp file `%s': ", file);
}
exit(0);
/* UNREACHABLE */
Error(0, 1, "Unreachable code!\n");
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Encrypt a password. Returns value from crypt() or similar. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
char *
docrypt(prompt, salt)
char *prompt;
char *salt;
{
char *crypt();
char *getpass();
char buf[300];
int n;
n = s_getpass(prompt, use_stdin, buf, sizeof(buf));
if (n < 0) {
Error(0, 1, "Failed to get password.\n");
} else if (n >= sizeof(buf)) {
Error(0, 1, "Buffer too small (%d chars) to hold input password!\n",
sizeof(buf)-1);
}
#ifdef _HPUX_SOURCE
if (iscomsec()) {
#if (HPUX_MAJOR == 10)
return bigcrypt(buf, salt);
#endif
#if (HPUX_MAJOR == 11)
return bigcrypt(buf, salt);
#endif
return crypt(buf, salt);
} else {
return crypt(buf, salt);
}
#else
return crypt(buf, salt);
#endif
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Gets a user's encrypted password. Returns -1 on failure, +1 on success */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
get_password(cmd, caller, user, salt, encr)
char *cmd;
char *caller; /* the person who invoked super */
char *user; /* the person whose authentication is required */
char *salt;
char *encr;
{
/* No such file or password timed out -- get password */
int ntry, match;
char msg[500];
char *encrypted = NULL;
if (strcmp(encr, "") == 0) {
return Error(0, 0,
"Command requires a password, but user `%s' has no password\n", user);
}
for (ntry=0, match=0; ntry < MAXTRY && !match; ntry++) {
if (ntry == 0) {
if (localinfo.authinfo.prompt && localinfo.authinfo.prompt[0]) {
stringcopy(msg,
do_variables(localinfo.authinfo.prompt), sizeof(msg));
} else if (strcmp(caller, user) == 0) {
(void) sprintf(msg,
"Your password is required for super command `%.400s'...\nPassword: ",
cmd);
} else {
(void) sprintf(msg,
"%c%s's password is required for super command `%.400s'...\nPassword: ",
toupper(*user), user+1, cmd);
}
} else {
strcpy(msg, "Password incorrect\nPassword: ");
}
encrypted = docrypt(msg, salt);
if (encr && encrypted) {
match = (strcmp(encr, encrypted) == 0);
} else {
match = 0;
}
}
if (!match)
return Error(0, 0, "Password incorrect\n");
return 1;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Looks up a group name or number (as a text string), returns gid.
* Accepts special names (e.g. <caller> or <owner>).
* Returns -1 if no such group.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
findgid(allowbrackets, grouplabel)
int allowbrackets; /* accept names like <caller> */
char *grouplabel; /* name or numeric form */
{
struct group *gp;
SETGRENT_T setgrent();
void endgrent();
int numeric_gid;
int found_gid, is_numeric=0;
int l=strlen(grouplabel);
char c;
if (allowbrackets && grouplabel[0] == '<' && grouplabel[l-1] == '>') {
/* Translate special name */
struct passwd *pw = getpwentry(1, grouplabel);
if (!pw)
return -1;
else
return pw->pw_gid;
}
is_numeric = (sscanf(grouplabel, "%d%c", &numeric_gid, &c) == 1);
if (is_numeric)
return numeric_gid;
/* Grouplabel didn't look like a number (according to sscanf),
* so look up its name.
*/
setgrent();
for (found_gid = -1, gp = getgrent(); gp; gp = getgrent()) {
if (strcmp(grouplabel, gp->gr_name) == 0) {
/* Found the gid in the group file */
found_gid = gp->gr_gid;
break;
}
}
endgrent();
return found_gid;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Adds condition to condition list.
* returns -1 on syntax error, malloc error, etc;
* returns 0 otherwise.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
InsertCondition(condition, s, isglobal)
char *condition; /* condition to insert: xxx~yyy */
char *s; /* pts to yyy in condition */
int isglobal; /* Is this a per-command or global condition? */
{
char **globlist;
TimeList *tl;
int i;
int invert = (*condition == '!');
if ( invert )
condition++;
/* All conditions accept {a,b,c} or a,b,c as lists.
* Form the globlist and pass along...
*/
/* Do brace globbing */
if ((i=globbraces(s, 1, &globlist)) != 0) {
/* Local Condition */
return Error(0, 0, "%tMissing `%c'.\n", i);
}
if (balancedbraces(s) != 0) {
return Error(0, 0, "%tUnbalanced braces in %s.\n", s);
}
if (STRMATCH3("time", condition, s-1)) {
tl = isglobal ? &globalinfo.timeafter : &localinfo.time;
if (InsertTimeList(s, globlist,
tl, isglobal ? "global" : "local", invert) == -1)
return -1;
} else if (STRMATCH3("user", condition, s-1)) {
if (InsertUserList(s, globlist,
&localinfo.userpats, &localinfo.origtext, invert) == -1)
return -1;
} else {
return Error(0, 0,
"%t\n\tInternal error: unrecognized condition <%s>.\n",
condition);
}
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Add a user/group/host pattern to a list.
* returns -1 on syntax error, malloc error, etc;
* returns 0 otherwise.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
InsertUserList(wd, wdlist, sl, otl, invert)
char *wd; /* Pattern to match; must NOT have leading '!'; braces ok;
* disallow '<', '>'.
*/
char **wdlist; /* brace-expanded u/g/h list */
Simple2List *sl;/* Insert user list elements (i.e. argument wdlist)
* at sl->next.
*/
SimpleList *otl;/* Insert original text (i.e. argument wd) * at otl->next. */
int invert; /* Inverts the test */
{
int iwd;
char *tok, *s;
SimpleList *new;
Simple2List *new2;
/* Check for illegal characters */
if ((s=strchr(wd, '>')) || (s=strchr(wd, '<'))) {
if (s-wd == 4 && strncmp(wd, "time", 4) == 0) {
return Error(0, 0,
"%t\n\tPermittedUser patterns may not use '>' or '<';\n\
\tyou used '%s'; perhaps you meant to write 'time~%s'\n", wd, s);
} else {
return Error(0, 0,
"%t\n\tPermittedUser patterns may not use '>' or '<';\n\
\tyou used '%s'.\n", wd);
}
}
new = (SimpleList *) malloc(sizeof(SimpleList));
if (!new)
return Error(0, 0, "%t\n\tFailed to malloc space for PermittedUser\n");
new->next = otl->next;
new->pat = (char *) malloc(strlen(wd) + 1);
if (!new->pat)
return Error(0, 0,
"%t\n\tFailed to malloc space for PermittedUser pat\n");
strcpy(new->pat, wd);
otl->next = new;
for (iwd=0; (tok=wdlist[iwd]); iwd++) {
new2 = (Simple2List *) malloc(sizeof(Simple2List));
if (!new2)
return Error(0, 0,
"%t\n\tFailed to malloc space for PermittedUser\n");
new2->next = sl->next;
new2->other = otl->next;
new2->pat = (char *) malloc(strlen(tok) + (invert ? 2 : 1));
if (!new2->pat)
return Error(0, 0,
"%t\n\tFailed to malloc space for PermittedUser pat\n");
if (invert) {
*new2->pat = '!';
strcpy(new2->pat+1, tok);
} else {
strcpy(new2->pat, tok);
}
sl->next = new2;
}
return 0;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Match a list of user/group/host pattern against the present user. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void
match_ugh_user(sl, isglobal)
Simple2List *sl;/* A list of user pats to match against, starting at sl->next */
int isglobal; /* !0 means its from a global def */
{
/* Checks if user is matched against each elt in sl.
* Sets matches.match_user if user matches; sets it to 1 if the last
* match is non-inverting, 0 otherwise.
* BUT! the list created by the InsertUserList function
* is in reverse order, so we only need to find the first
* entry in the list that is a match (+ or -) and stop there!
*/
int invert, match;
int check_ugh P__((char *, char *));
for (match=0, sl=sl->next; sl && !match; sl=sl->next) {
invert = *sl->pat == '!';
if (check_ugh(sl->other->pat, invert ? sl->pat+1 : sl->pat) == 0) {
match = 1;
matches.user = invert ? 0 : 1;
if (debug || it_came_from_cmdline)
(void) fprintf(stderr,
"\tPermission %s: %s pattern %suser~%s\n",
invert ? "denied" : "allowed",
isglobal ? "global" : "per-cmd",
invert ? "!" : "", sl->other->pat);
} else if (debug || it_came_from_cmdline) {
(void) fprintf(stderr, "\tNot applicable: %s pattern %suser~%s\n",
isglobal ? "global" : "per-cmd",
invert ? "!" : "", sl->other->pat);
}
}
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Check pattern against a hostname. If the hostname is fully-qualified,
* then try stripping off each of the domains to find a match.
* Return -1 on failure to match; 0 on success.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
check_host(pat, host)
char *pat, *host;
{
int is_netgroup = 0;
int match;
char *p, *dotp;
if (*pat == '+') {
is_netgroup = 1;
++pat;
}
match = (is_netgroup ? netgrp_h_compare(pat, host)
: (*pat_compare)(host));
dotp = strrchr (host, '.');
while (dotp && !match) {
*dotp = 0;
match = (is_netgroup ? netgrp_h_compare(pat, host)
: (*pat_compare)(host));
p = strrchr (host, '.');
*dotp = '.';
dotp = p;
}
return (match ? 0 : -1);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Try to match a string to a pattern. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
match_pattern(match, do_glob, str, pattern)
int match; /* Return input value of match on failure; 1 on success */
int do_glob; /* 0: no brace globbing;
* 1: brace glob;
* >1: wrap in braces, then brace-glob.
*/
char *str;
char *pattern;
{
int i, ipat, wrap;
char *tok, tokbuf[1000];
char **patlist, *pat1list[2];
char chkbuf[1024];
if (do_glob != 0) {
/* Do brace globbing on the pattern */
wrap = (do_glob > 1) ? 1 : 0;
if ((i=globbraces(pattern, wrap, &patlist)) != 0) {
Error(0, 0, "%tMissing `%c'.\n", i);
return match;
}
} else {
pat1list[0] = pattern;
pat1list[1] = NULL;
patlist = pat1list;
}
if (balancedbraces(pattern) != 0) {
Error(0, 0, "%tUnbalanced braces in %s.\n", pattern);
return match;
}
for (ipat=0; (tok=patlist[ipat]); ipat++) {
strcpy(tokbuf, tok);
anchor(tok, chkbuf); /* Anchor all matches */
if ((*pat_compile)(chkbuf) != NULL) {
Error(0, 0, "%t\n\tBad command pattern: `%s'.\n", pattern);
return match;
} else if ((*pat_compare)(str) == 1) {
if (debug)
(void) fprintf(stderr,
"\tMatched user's command=%s to CmdPattern=%s\n",
str, pattern);
return 1;
} else if (debug) {
(void) fprintf(stderr,
"\tNo match user's command=%s to CmdPattern=%s\n",
str, pattern);
}
}
return match;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Check a single user/group/host string
* Return -1 on failure to match; 0 on success.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int
check_ugh(origtext, token)
char *origtext; /* original text -- for error messages */
char *token; /* user/group/host pattern */
{
char chkbuf[1024];
char *userpat, *grouppat, *hostpat;
char *colon;
int match, i;
if (strlen(token) > sizeof(chkbuf)-4) {
return Error(0, 1, "%tCan't handle patterns larger than %d chars.\n",
sizeof(chkbuf)-4);
}
/* Split into user:group@host; check host part first (if it exists) */
if ((hostpat = strchr(token, '@'))) {
if (hostpat[1] == 0) {
return Error(0, 0,
"%tMissing hostname in pattern `%s'.\n", origtext);
}
*hostpat++ = 0;
match = -1;
if (hostpat[0] == '+') {
#ifdef HAVE_INNETGR
if (hostpat[1] == 0) {
return Error(0, 0,
"%tMissing netgroupname in pattern `%s'.\n", origtext);
}
match = check_host(hostpat, userinfo.hostname);
#else
return Error(0, 0,
"%thostnames may not begin with `+' since this super() was compiled\n\
without -DHAVE_INNETGR.\n");
#endif
} else {
strtolower(hostpat);
anchor(hostpat, chkbuf); /* Force all matches to be anchored */
if ((*pat_compile)(chkbuf) != NULL) {
return Error(0, 0, "%tbad host pattern: `%s'.\n", origtext);
}
}
if (match == -1)
match = check_host(hostpat, userinfo.lc_hostname);
if (debug > 1)
fprintf(stderr,
"\thost pattern <%s> %s user's host <%s>\n",
hostpat, (match == -1) ? "did not match" : "matched",
userinfo.lc_hostname);
if (match == -1)
return -1;
}
colon = grouppat = strchr(token, ':');
userpat = token;
if (*token == '\0' && !hostpat) {
/* Nothing in pattern?! */
return Error(0, 0, "%t\n\tUnacceptable pattern `%s'.\n", origtext);
} else if (*token == '\0') {
userpat = grouppat = "^.*$"; /* only hostname given */
} else if (grouppat && *(grouppat+1)) { /* pat is "uuu:ggg or ":ggg" */
if (token == grouppat)
userpat = "^.*$"; /* pat is ":ggg" */
*grouppat++ = '\0';
} else { /* pat is "uuu" or "uuu:" */
if (grouppat)
*grouppat = '\0'; /* pat is "uuu:" */
grouppat = "^.*$";
}
if (strchr(grouppat, ':')) {
return Error(0, 0, "%t\n\tGroup pattern `%s' contains a colon!\n",
grouppat);
}
if (globalinfo.group_slash == 0 && strchr(grouppat, '/')) {
return Error(0, 0, "%t\n\tFormat error in super.tab file: \
group pattern `%s' contains a slash.\n\
\tPerhaps you meant to use Cmd::Filename, but forgot one colon,\n\
\tso it looks like User:Group? If you really need to allow\n\
\tslashes in group patterns, use global option group_slash=y.\n", grouppat);
}
#ifdef HAVE_INNETGR
if (userpat[0] == '+') {
if (userpat[1] == 0) {
return Error(0, 0,
"%tMissing netgroupname in pattern `%s'.\n", origtext);
}
match = netgrp_u_compare(&userpat[1], userinfo.caller.pw_name);
} else
#endif
{
anchor(userpat, chkbuf); /* Anchor all matches */
if ((*pat_compile)(chkbuf) != NULL) {
return Error(0, 0, "%t\n\tbad user pattern: `%s'.\n", origtext);
}
match = (*pat_compare)(userinfo.caller.pw_name);
#ifdef MATCH_DECIMAL_UID
if (match != 1) {
/* Enabling MATCH_DECIMAL_UID allows the userpat to be
* numeric, as an alternative to being interpreted as a
* user name: after checking the username, we check if the
* user's uid, as a decimal text value, matches the user
* pattern userpat.
*/
char buf[20];
(void) sprintf(buf, "%d", userinfo.caller.pw_uid);
match = (*pat_compare)(buf);
}
#endif
}
if (debug > 1)
fprintf(stderr,
"\tuser pattern <%s> %s username <%s>\n",
userpat, (match != 1) ? "did not match" : "matched",
userinfo.caller.pw_name);
if (match != 1)
return -1;
anchor(grouppat, chkbuf);
i = ingroup(userinfo.caller.pw_name, userinfo.caller.pw_gid, chkbuf);
if (i == -1)
return Error(0, 0, "%t\n\tbad group pattern\n", origtext);
if (debug > 1)
fprintf(stderr,
"\tuser <%s> is %sa member of group <%s>\n",
userinfo.caller.pw_name, (i != 1) ? "not " : "", grouppat);
if (i != 1)
return -1;
return 0; /* Success! */
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Determines if user's group matches a group pattern. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static int created_group_table = 0;
int
ingroup(user, gid, gp_pat)
char *user;
gid_t gid;
char *gp_pat; /* pattern to match */
{
/* Use:
* ingroup(user, gid, gp_pat)
* Returns:
* 1 if the user is in a group matching the regex pattern gp_pat.
* 0 if the user isn't in a group matching the pattern.
* -1 if pattern failed to compile.
* SIDE-EFFECT: uses pat_compile/pat_compare!
* -- messes up caller's use of same!
* Examples:
* ingroup("joe", joes_gid, "xyz")
* returns !0 if user joe is in group "xyz".
* ingroup("joe", joes_gid, "xy.*")
* returns !0 if user joe is in any group matching "xy.*".
*/
struct group *gp;
char **mem;
char buf[20];
SETGRENT_T setgrent();
void endgrent();
ENTRY item, *found_item;
int passed, klen;
if ((*pat_compile)(gp_pat) != (char *)0 )
return -1;
if (!created_group_table) {
if (!s_hcreate(HS_GROUP, 1000)) {
return Error(0, 0,
"%tCouldn't allocate hash table for group processing\n");
}
created_group_table = 1;
}
/* Catenate user, gid and gp_pat for the key such that
* "abc" + 10 + "de" is not the same as "ab" + 1 + "0cde".
* Use "\n", as that will have been stripped from input before we get here.
*/
if (snprintf(keybuf, MAX_KEYLEN, "%s\n%d\n%s", user, gid, gp_pat)
>= MAX_KEYLEN) {
return Error(0, 0,
"%tuser/gid/gp_pat too large for user ng processing\n");
}
item.key = keybuf;
if (found_item = s_hsearch(HS_GROUP, item, FIND)) {
return found_item->data == YES? 1: 0;
}
passed = 0; /* Assume the worst */
/* Search group file for groups user is in. For each group of which
* the user is a member, test a match to the pattern.
*/
setgrent();
for (gp = getgrent(); gp; gp = getgrent()) {
/* The gr_mem list only shows usernames added in the /etc/group file,
* and not any users assigned to the group in the passwd file.
* Thus discover group membership by first checking the user's
* group from the password file (gp->gr_gid) against this group's
* gid, then check to see if this user is in the gp->gr_mem list.
*/
if (gid != gp->gr_gid) {
for (mem = gp->gr_mem; *mem ; mem++)
if (strcmp(*mem, user) == 0)
break;
if (!*mem)
continue; /* not in group */
}
/* if here, the user is in group gp; now check if group
* name gp->gr_name matches group pattern gp_pat.
*/
if ((*pat_compare)(gp->gr_name) == 1) {
/* successful match -- user is in a group that matches gp_pat */
endgrent();
/* return 1; */
passed = 1;
goto found_it;
}
#ifdef MATCH_DECIMAL_GID
else {
/* Enabling MATCH_DECIMAL_GID allows the gp_pat to be
* numeric, as an alternative to being interpreted as a
* group name: we check if the group id gp->gr_gid, as a
* decimal text value, matches the group pattern gp_pat.
*/
(void) sprintf(buf, "%d", gp->gr_gid);
if ((*pat_compare)(buf) == 1){
/* successful match -- user is in a group that matches gp_pat */
endgrent();
/* return 1; */
passed = 1;
goto found_it;
}
}
#endif
}
#ifdef MATCH_DECIMAL_GID
/* We haven't found any group from /etc/group to which we belong that
* matches the pattern. It is possible that the user's group id from the
* password file isn't in the /etc/group file at all, in which case the
* user's group won't have matched the pattern since we've only checked
* /etc/group entries so far. Now check the numeric id from the
* /etc/passwd file against the pattern.
*/
(void) sprintf(buf, "%d", gid);
if ((*pat_compare)(buf) == 1){
endgrent();
/* return 1; */
passed = 1;
goto found_it;
}
#endif
endgrent();
/* return 0; */
found_it:
/* Have to make this key a permanent copy for the hash */
klen = strlen(keybuf);
item.key = malloc(klen + 1);
if (!item.key) {
return Error(0, 0,
"%tout of memory for group processing\n");
}
strcpy(item.key, keybuf);
item.data = passed? YES: NO;
if (!s_hsearch(HS_GROUP, item, ENTER)) {
return Error(0, 0,
"%thash set failure for group processing\n");
}
return passed;
}
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