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-rw-r--r--modules/pam_access/pam_access.c497
1 files changed, 0 insertions, 497 deletions
diff --git a/modules/pam_access/pam_access.c b/modules/pam_access/pam_access.c
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index 4005c93b..00000000
--- a/modules/pam_access/pam_access.c
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@@ -1,497 +0,0 @@
-/* pam_access module */
-
-/*
- * Written by Alexei Nogin <alexei@nogin.dnttm.ru> 1997/06/15
- * (I took login_access from logdaemon-5.6 and converted it to PAM
- * using parts of pam_time code.)
- *
- ************************************************************************
- * Copyright message from logdaemon-5.6 (original file name DISCLAIMER)
- ************************************************************************
- * Copyright 1995 by Wietse Venema. All rights reserved. Individual files
- * may be covered by other copyrights (as noted in the file itself.)
- *
- * This material was originally written and compiled by Wietse Venema at
- * Eindhoven University of Technology, The Netherlands, in 1990, 1991,
- * 1992, 1993, 1994 and 1995.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this entire copyright notice is duplicated in all such
- * copies.
- *
- * This software is provided "as is" and without any expressed or implied
- * warranties, including, without limitation, the implied warranties of
- * merchantibility and fitness for any particular purpose.
- *************************************************************************
- */
-
-#include <security/_pam_aconf.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#include <stdarg.h>
-#include <syslog.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <pwd.h>
-#include <grp.h>
-#include <errno.h>
-#include <ctype.h>
-#include <sys/utsname.h>
-
-#ifndef BROKEN_NETWORK_MATCH
-# include <netdb.h>
-# include <sys/socket.h>
-#endif
-
-/*
- * here, we make definitions for the externally accessible functions
- * in this file (these definitions are required for static modules
- * but strongly encouraged generally) they are used to instruct the
- * modules include file to define their prototypes.
- */
-
-#define PAM_SM_ACCOUNT
-
-#include <security/_pam_macros.h>
-#include <security/pam_modules.h>
-
-int strcasecmp(const char *s1, const char *s2);
-
-/* login_access.c from logdaemon-5.6 with several changes by A.Nogin: */
-
- /*
- * This module implements a simple but effective form of login access
- * control based on login names and on host (or domain) names, internet
- * addresses (or network numbers), or on terminal line names in case of
- * non-networked logins. Diagnostics are reported through syslog(3).
- *
- * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
- */
-
-#if !defined(MAXHOSTNAMELEN) || (MAXHOSTNAMELEN < 64)
-#undef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN 256
-#endif
-
-#ifdef DEFAULT_CONF_FILE
-# define PAM_ACCESS_CONFIG DEFAULT_CONF_FILE
-#else
-# define PAM_ACCESS_CONFIG "/etc/security/access.conf"
-#endif
-
- /* Delimiters for fields and for lists of users, ttys or hosts. */
-
-static const char *fs = ":"; /* field separator */
-static const char sep[] = ", \t"; /* list-element separator */
-
- /* Constants to be used in assignments only, not in comparisons... */
-
-#define YES 1
-#define NO 0
-
- /*
- * A structure to bundle up all login-related information to keep the
- * functional interfaces as generic as possible.
- */
-struct login_info {
- struct passwd *user;
- char *from;
- const char *config_file;
- const char *service;
-};
-
-/* --- static functions for checking whether the user should be let in --- */
-
-static void _log_err(const char *format, ... )
-{
- va_list args;
-
- va_start(args, format);
- openlog("pam_access", LOG_CONS|LOG_PID, LOG_AUTH);
- vsyslog(LOG_ERR, format, args);
- va_end(args);
- closelog();
-}
-
-/* Parse module config arguments */
-
-static int parse_args(struct login_info *loginfo, int argc, const char **argv)
-{
- int i;
-
- for (i=0; i<argc; ++i) {
- if (!strncmp("fieldsep=", argv[i], 9)) {
-
- /* the admin wants to override the default field separators */
- fs = argv[i]+9;
-
- } else if (!strncmp("accessfile=", argv[i], 11)) {
- FILE *fp = fopen(11 + argv[i], "r");
-
- if (fp) {
- loginfo->config_file = 11 + argv[i];
- fclose(fp);
- } else {
- _log_err("for service [%s] failed to open accessfile=[%s]"
- , loginfo->service, 11 + argv[i]);
- return 0;
- }
-
- } else {
- _log_err("unrecognized option [%s]", argv[i]);
- }
- }
-
- return 1; /* OK */
-}
-
-typedef int match_func (char *, struct login_info *);
-
-static int list_match (char *, struct login_info *,
- match_func *);
-static int user_match (char *, struct login_info *);
-static int from_match (char *, struct login_info *);
-static int string_match (char *, char *);
-
-/* login_access - match username/group and host/tty with access control file */
-
-static int login_access(struct login_info *item)
-{
- FILE *fp;
- char line[BUFSIZ];
- char *perm; /* becomes permission field */
- char *users; /* becomes list of login names */
- char *froms; /* becomes list of terminals or hosts */
- int match = NO;
- int end;
- int lineno = 0; /* for diagnostics */
-
- /*
- * Process the table one line at a time and stop at the first match.
- * Blank lines and lines that begin with a '#' character are ignored.
- * Non-comment lines are broken at the ':' character. All fields are
- * mandatory. The first field should be a "+" or "-" character. A
- * non-existing table means no access control.
- */
-
- if ((fp = fopen(item->config_file, "r"))!=NULL) {
- while (!match && fgets(line, sizeof(line), fp)) {
- lineno++;
- if (line[end = strlen(line) - 1] != '\n') {
- _log_err("%s: line %d: missing newline or line too long",
- item->config_file, lineno);
- continue;
- }
- if (line[0] == '#')
- continue; /* comment line */
- while (end > 0 && isspace(line[end - 1]))
- end--;
- line[end] = 0; /* strip trailing whitespace */
- if (line[0] == 0) /* skip blank lines */
- continue;
- if (!(perm = strtok(line, fs))
- || !(users = strtok((char *) 0, fs))
- || !(froms = strtok((char *) 0, fs))
- || strtok((char *) 0, fs)) {
- _log_err("%s: line %d: bad field count",
- item->config_file, lineno);
- continue;
- }
- if (perm[0] != '+' && perm[0] != '-') {
- _log_err("%s: line %d: bad first field",
- item->config_file, lineno);
- continue;
- }
- match = (list_match(froms, item, from_match)
- && list_match(users, item, user_match));
- }
- (void) fclose(fp);
- } else if (errno != ENOENT) {
- _log_err("cannot open %s: %m", item->config_file);
- }
- return (match == 0 || (line[0] == '+'));
-}
-
-/* list_match - match an item against a list of tokens with exceptions */
-
-static int list_match(char *list, struct login_info *item, match_func *match_fn)
-{
- char *tok;
- int match = NO;
-
- /*
- * Process tokens one at a time. We have exhausted all possible matches
- * when we reach an "EXCEPT" token or the end of the list. If we do find
- * a match, look for an "EXCEPT" list and recurse to determine whether
- * the match is affected by any exceptions.
- */
-
- for (tok = strtok(list, sep); tok != 0; tok = strtok((char *) 0, sep)) {
- if (strcasecmp(tok, "EXCEPT") == 0) /* EXCEPT: give up */
- break;
- if ((match = (*match_fn) (tok, item))) /* YES */
- break;
- }
- /* Process exceptions to matches. */
-
- if (match != NO) {
- while ((tok = strtok((char *) 0, sep)) && strcasecmp(tok, "EXCEPT"))
- /* VOID */ ;
- if (tok == 0 || list_match((char *) 0, item, match_fn) == NO)
- return (match);
- }
- return (NO);
-}
-
-/* myhostname - figure out local machine name */
-
-static char * myhostname(void)
-{
- static char name[MAXHOSTNAMELEN + 1];
-
- gethostname(name, MAXHOSTNAMELEN);
- name[MAXHOSTNAMELEN] = 0;
- return (name);
-}
-
-/* netgroup_match - match group against machine or user */
-
-static int netgroup_match(char *group, char *machine, char *user)
-{
-#ifdef NIS
- static char *mydomain = 0;
-
- if (mydomain == 0)
- yp_get_default_domain(&mydomain);
- return (innetgr(group, machine, user, mydomain));
-#else
- _log_err("NIS netgroup support not configured");
- return (NO);
-#endif
-}
-
-/* user_match - match a username against one token */
-
-static int user_match(char *tok, struct login_info *item)
-{
- char *string = item->user->pw_name;
- struct login_info fake_item;
- struct group *group;
- int i;
- char *at;
-
- /*
- * If a token has the magic value "ALL" the match always succeeds.
- * Otherwise, return YES if the token fully matches the username, if the
- * token is a group that contains the username, or if the token is the
- * name of the user's primary group.
- */
-
- if ((at = strchr(tok + 1, '@')) != 0) { /* split user@host pattern */
- *at = 0;
- fake_item.from = myhostname();
- return (user_match(tok, item) && from_match(at + 1, &fake_item));
- } else if (tok[0] == '@') { /* netgroup */
- return (netgroup_match(tok + 1, (char *) 0, string));
- } else if (string_match(tok, string)) { /* ALL or exact match */
- return (YES);
- } else if ((group = getgrnam(tok))) { /* try group membership */
- if (item->user->pw_gid == group->gr_gid)
- return (YES);
- for (i = 0; group->gr_mem[i]; i++)
- if (strcasecmp(string, group->gr_mem[i]) == 0)
- return (YES);
- }
- return (NO);
-}
-
-/* from_match - match a host or tty against a list of tokens */
-
-static int from_match(char *tok, struct login_info *item)
-{
- char *string = item->from;
- int tok_len;
- int str_len;
-
- /*
- * If a token has the magic value "ALL" the match always succeeds. Return
- * YES if the token fully matches the string. If the token is a domain
- * name, return YES if it matches the last fields of the string. If the
- * token has the magic value "LOCAL", return YES if the string does not
- * contain a "." character. If the token is a network number, return YES
- * if it matches the head of the string.
- */
-
- if (tok[0] == '@') { /* netgroup */
- return (netgroup_match(tok + 1, string, (char *) 0));
- } else if (string_match(tok, string)) { /* ALL or exact match */
- return (YES);
- } else if (tok[0] == '.') { /* domain: match last fields */
- if ((str_len = strlen(string)) > (tok_len = strlen(tok))
- && strcasecmp(tok, string + str_len - tok_len) == 0)
- return (YES);
- } else if (strcasecmp(tok, "LOCAL") == 0) { /* local: no dots */
- if (strchr(string, '.') == 0)
- return (YES);
-#ifdef BROKEN_NETWORK_MATCH
- } else if (tok[(tok_len = strlen(tok)) - 1] == '.' /* network */
- && strncmp(tok, string, tok_len) == 0) {
- return (YES);
-#else /* BROKEN_NETWORK_MATCH */
- } else if (tok[(tok_len = strlen(tok)) - 1] == '.') {
- /*
- The code below does a more correct check if the address specified
- by "string" starts from "tok".
- 1998/01/27 Andrey V. Savochkin <saw@msu.ru>
- */
-
- struct hostent *h;
- char hn[3+1+3+1+3+1+3+1+1];
- int r;
-
- h = gethostbyname(string);
- if (h == NULL)
- return (NO);
- if (h->h_addrtype != AF_INET)
- return (NO);
- if (h->h_length != 4)
- return (NO); /* only IPv4 addresses (SAW) */
- r = snprintf(hn, sizeof(hn), "%u.%u.%u.%u.",
- (unsigned char)h->h_addr[0], (unsigned char)h->h_addr[1],
- (unsigned char)h->h_addr[2], (unsigned char)h->h_addr[3]);
- if (r < 0 || r >= sizeof(hn))
- return (NO);
- if (!strncmp(tok, hn, tok_len))
- return (YES);
-#endif /* BROKEN_NETWORK_MATCH */
- }
- return (NO);
-}
-
-/* string_match - match a string against one token */
-
-static int string_match(char *tok, char *string)
-{
-
- /*
- * If the token has the magic value "ALL" the match always succeeds.
- * Otherwise, return YES if the token fully matches the string.
- */
-
- if (strcasecmp(tok, "ALL") == 0) { /* all: always matches */
- return (YES);
- } else if (strcasecmp(tok, string) == 0) { /* try exact match */
- return (YES);
- }
- return (NO);
-}
-
-/* end of login_access.c */
-
-int strcasecmp(const char *s1, const char *s2)
-{
- while ((toupper(*s1)==toupper(*s2)) && (*s1) && (*s2)) {s1++; s2++;}
- return(toupper(*s1)-toupper(*s2));
-}
-
-/* --- public account management functions --- */
-
-PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh,int flags,int argc
- ,const char **argv)
-{
- struct login_info loginfo;
- const char *user=NULL, *service=NULL;
- char *from=NULL;
- struct passwd *user_pw;
-
- if ((pam_get_item(pamh, PAM_SERVICE, (const void **)&service)
- != PAM_SUCCESS) || (service == NULL) || (*service == ' ')) {
- _log_err("cannot find the service name");
- return PAM_ABORT;
- }
-
- /* set username */
-
- if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL
- || *user == '\0') {
- _log_err("cannot determine the user's name");
- return PAM_USER_UNKNOWN;
- }
-
- /* remote host name */
-
- if (pam_get_item(pamh, PAM_RHOST, (const void **)&from)
- != PAM_SUCCESS) {
- _log_err("cannot find the remote host name");
- return PAM_ABORT;
- }
-
- if ((from==NULL) || (*from=='\0')) {
-
- /* local login, set tty name */
-
- if (pam_get_item(pamh, PAM_TTY, (const void **)&from) != PAM_SUCCESS
- || from == NULL) {
- D(("PAM_TTY not set, probing stdin"));
- from = ttyname(STDIN_FILENO);
- if (from == NULL) {
- _log_err("couldn't get the tty name");
- return PAM_ABORT;
- }
- if (pam_set_item(pamh, PAM_TTY, from) != PAM_SUCCESS) {
- _log_err("couldn't set tty name");
- return PAM_ABORT;
- }
- }
- if (strncmp("/dev/",from,5) == 0) { /* strip leading /dev/ */
- from += 5;
- }
-
- }
-
- if ((user_pw=getpwnam(user))==NULL) return (PAM_USER_UNKNOWN);
-
- /*
- * Bundle up the arguments to avoid unnecessary clumsiness later on.
- */
- loginfo.user = user_pw;
- loginfo.from = from;
- loginfo.service = service;
- loginfo.config_file = PAM_ACCESS_CONFIG;
-
- /* parse the argument list */
-
- if (!parse_args(&loginfo, argc, argv)) {
- _log_err("failed to parse the module arguments");
- return PAM_ABORT;
- }
-
- if (login_access(&loginfo)) {
- return (PAM_SUCCESS);
- } else {
- _log_err("access denied for user `%s' from `%s'",user,from);
- return (PAM_PERM_DENIED);
- }
-}
-
-/* end of module definition */
-
-#ifdef PAM_STATIC
-
-/* static module data */
-
-struct pam_module _pam_access_modstruct = {
- "pam_access",
- NULL,
- NULL,
- pam_sm_acct_mgmt,
- NULL,
- NULL,
- NULL
-};
-#endif
-
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