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config.c
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config.c
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/*
* $Id: config.c,v 1.48 2009-04-10 16:19:04 heas Exp $
*
* Copyright (c) 1995-1998 by Cisco systems, Inc.
*
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that this
* copyright and permission notice appear on all copies of the
* software and supporting documentation, the name of Cisco Systems,
* Inc. not be used in advertising or publicity pertaining to
* distribution of the program without specific prior permission, and
* notice be given in supporting documentation that modification,
* copying and distribution is by permission of Cisco Systems, Inc.
*
* Cisco Systems, Inc. makes no representations about the suitability
* of this software for any purpose. THIS SOFTWARE IS PROVIDED ``AS
* IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "tac_plus.h"
#include <regex.h>
#ifndef REG_OK
# ifdef REG_NOERROR
# define REG_OK REG_NOERROR
# else
# define REG_OK 0
# endif
#endif
/*
<config> := <decl>*
<decl> := <top_level_decl> |
<acl_decl> |
<user_decl> |
<group_decl> |
<host_decl>
<top_level_decl> := <authen_default> |
accounting file = <filename> |
accounting syslog |
key = <string> |
logging = <syslog_fac>
<authen_default> := default authentication = file <filename>
<permission> := permit | deny
<filename> := <string>
<password> := <string>
<syslog_fac> := (auth|cron|daemon|ftp|kern|lpr|mail|news|
syslog|user|uucp|local[0-7])
<host_decl> := host = <string> {
key = <string>
prompt = <string>
enable = aceclnt|cleartext|des|
file <filename/string>|
nopassword|skey
}
<user_decl> := user = <string> {
[ default service = <permission> ]
<user_attr>*
<svc>*
}
<password_spec> := nopassword |
#ifdef ACECLNT
aceclnt|
#endif
cleartext <password> |
des <password> |
file <filename> |
#ifdef HAVE_PAM
PAM |
#endif
skey
<user_attr> := name = <string> |
login = <password_spec> |
member = <string> |
expires = <string> |
arap = cleartext <string> |
chap = cleartext <string> |
#ifdef MSCHAP
ms-chap = cleartext <string> |
#endif
pap = cleartext <string> |
pap = des <string> |
#ifdef HAVE_PAM
pap = PAM |
#endif
opap = cleartext <string> |
global = cleartext <string> |
msg = <string>
before authorization = <string> |
after authorization = <string>
<svc> := <svc_auth> | <cmd_auth>
<cmd_auth> := cmd = <string> {
<cmd-match>*
}
<cmd-match> := <permission> <string>
<proto> := XXX define this
<svc_auth> := service = ( arap | connection | exec |
ppp protocol = <proto> | shell |
slip | system | tty-daemon |
<client defined> ) {
[ default attribute = permit ]
<attr_value_pair>*
}
<attr_value_pair> := [ optional ] <string> = <string>
*/
static char sym_buf[MAX_INPUT_LINE_LEN]; /* parse buffer */
static int sym_pos = 0; /* current place in sym_buf */
static int sym_ch; /* current parse character */
static int sym_code; /* parser output */
static int sym_line = 1; /* current line number */
static FILE *cf = NULL; /* config file pointer */
static int sym_error = 0; /* a parsing error occurred */
static char *authen_default = NULL; /* top level authentication default */
static char *nopasswd_str = "nopassword";
/*
* A host definition structure.
* host-specific information e.g. per-host keys
*
* The first 2 fields (name and hash) are used by the hash table routines to
* hash this structure into a table. Do not (re)move them.
*/
typedef struct host {
char *name; /* host name */
void *hash; /* hash table next pointer */
int line; /* line number defined on */
char *key; /* host specific key */
/*char *type;*/ /* host type - XXX: no idea what should be
* here */
char *prompt; /* host login/username prompt string */
char *enable; /* host enable password */
int noenablepwd; /* host requires no enable password */
} HOST;
/*
* A user or group definition
* The first 2 fields (name and hash) are used by the hash table
* routines to hash this structure into a table. Move them at your peril
*/
typedef struct user {
char *name; /* username */
void *hash; /* hash table next pointer */
int line; /* line number defined on */
long flags; /* flags field */
#define FLAG_ISUSER 1 /* this structure represents a user */
#define FLAG_ISGROUP 2 /* this structure represents a group */
#define FLAG_SEEN 4 /* for circular definition detection */
char *full_name; /* users full name */
char *login; /* Login password */
int nopasswd; /* user requires no password */
#ifdef ACLS
char *acl; /* hosts (NASs) to allow / deny ACL */
# ifdef UENABLE
char *enable; /* user enable pwd */
int noenablepwd; /* user requires no enable password */
char *enableacl; /* hosts (NASs) to allow/deny enabling */
# endif
#endif
char *global; /* password to use if none set */
char *member; /* group we are a member of */
char *expires; /* expiration date */
char *arap; /* our arap secret */
char *pap; /* our pap secret */
char *opap; /* our outbound pap secret */
char *chap; /* our chap secret */
#ifdef MSCHAP
char *mschap; /* our mschap secret */
#endif /* MSCHAP */
char *msg; /* a message for this user */
char *before_author; /* command to run before authorization */
char *after_author; /* command to run after authorization */
int svc_dflt; /* default authorization behaviour for svc or
* cmd */
NODE *svcs; /* pointer to svc nodes */
#ifdef MAXSESS
int maxsess; /* Max sessions/user */
#endif /* MAXSESS */
} USER;
typedef USER GROUP;
#ifdef ACLS
typedef struct filter {
int isdeny;
char *string;
regex_t *string_reg;
struct filter *next;
} FILTER;
typedef struct acl {
char *name; /* acl name */
void *hash; /* hash table next pointer */
int line; /* line number defined on */
NODE *nodes; /* list of entrys */
} ACL;
#endif
/*
* Only the first 2 fields (name and hash) are used by the hash table
* routines to hash structures into a table.
*/
typedef union hash {
struct user u;
#ifdef ACLS
struct acl a;
#endif
struct host h;
} HASH;
void *grouptable[HASH_TAB_SIZE];/* Table of group declarations */
void *usertable[HASH_TAB_SIZE]; /* Table of user declarations */
#ifdef ACLS
void *acltable[HASH_TAB_SIZE]; /* Table of ACL declarations */
#endif
void *hosttable[HASH_TAB_SIZE]; /* Table of host declarations */
static VALUE cfg_get_hvalue(char *, int);
static VALUE cfg_get_value(char *, int, int, int);
static int circularity_check(void);
static void free_aclstruct(ACL *);
static void free_attrs(NODE *);
static void free_cmd_matches(NODE *);
static void free_hoststruct(HOST *);
static void free_svcs(NODE *);
static void free_userstruct(USER *);
static void getsym(void);
static VALUE get_value(USER *, int);
#ifdef ACLS
static int insert_acl_entry(ACL *, int);
static int parse_acl(void);
#endif
static NODE *parse_attrs(void);
static NODE *parse_cmd_matches(void);
static int parse_logging(void);
static int parse_host(void);
static int parse_opt_attr_default(void);
static int parse_opt_svc_default(void);
static int parse_permission(void);
static NODE *parse_svcs(void);
static int parse_user(void);
static void rch(void);
static void sym_get(void);
#ifdef __STDC__
#include <stdarg.h> /* ANSI C, variable length args */
static void
parse_error(char *fmt, ...)
#else
#include <varargs.h> /* has 'vararg' definitions */
/* VARARGS2 */
static void
parse_error(fmt, va_alist)
char *fmt;
va_dcl /* no terminating semi-colon */
#endif
{
char msg[256]; /* temporary string */
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
vsprintf(msg, fmt, ap);
va_end(ap);
report(LOG_ERR, "%s", msg);
fprintf(stderr, "Error: %s\n", msg);
tac_exit(1);
}
char *
cfg_nodestring(int type)
{
switch (type) {
default:
return("unknown node type");
case N_arg:
return("N_arg");
case N_optarg:
return("N_optarg");
case N_svc:
return("N_svc");
case N_svc_exec:
return("N_svc_exec");
case N_svc_slip:
return("N_svc_slip");
case N_svc_ppp:
return("N_svc_ppp");
case N_svc_arap:
return("N_svc_arap");
case N_svc_cmd:
return("N_svc_cmd");
case N_permit:
return("N_permit");
case N_deny:
return("N_deny");
}
}
static void
free_attrs(NODE *node)
{
NODE *next;
while (node) {
switch (node->type) {
case N_optarg:
case N_arg:
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free_cmd_match %s %s",
cfg_nodestring(node->type), node->value);
break;
default:
report(LOG_ERR, "Illegal node type %s for free_attrs",
cfg_nodestring(node->type));
return;
}
free(node->value);
next = node->next;
free(node);
node = next;
}
}
#ifdef ACLS
static void
free_aclstruct(ACL *acl)
{
NODE *last, *next = acl->nodes;
last = next;
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free_aclstruct %s", acl->name);
while (next) {
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free_aclstruct %s %s", acl->name, next->value);
if (next->value)
free(next->value);
if (next->value1)
free(next->value1);
next = next->next;
free(last);
last = next;
}
if (acl->name)
free(acl->name);
}
#endif
static void
free_cmd_matches(NODE *node)
{
NODE *next;
while (node) {
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free_cmd_match %s %s",
cfg_nodestring(node->type),
node->value);
free(node->value); /* text */
free(node->value1); /* regexp compiled text */
next = node->next;
free(node);
node = next;
}
}
static void
free_hoststruct(HOST *host)
{
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free %s", host->name);
if (host->name)
free(host->name);
if (host->key)
free(host->key);
/* if (host->type)
free(host->type); */
if (host->prompt)
free(host->prompt);
if (host->enable)
free(host->enable);
return;
}
static void
free_svcs(NODE *node)
{
NODE *next;
while (node) {
switch (node->type) {
case N_svc_cmd:
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free %s %s",
cfg_nodestring(node->type), node->value);
free(node->value); /* cmd name */
free_cmd_matches(node->value1);
next = node->next;
free(node);
node = next;
continue;
case N_svc:
case N_svc_ppp:
free(node->value1);
/* FALL-THROUGH */
case N_svc_exec:
case N_svc_arap:
case N_svc_slip:
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free %s", cfg_nodestring(node->type));
free_attrs(node->value);
next = node->next;
free(node);
node = next;
continue;
default:
report(LOG_ERR, "Illegal node type %d for free_svcs", node->type);
return;
}
}
}
static void
free_userstruct(USER *user)
{
if (debug & DEBUG_CLEAN_FLAG)
report(LOG_DEBUG, "free %s %s",
(user->flags & FLAG_ISUSER) ? "user" : "group",
user->name);
if (user->name)
free(user->name);
if (user->full_name)
free(user->full_name);
if (user->login)
free(user->login);
if (user->member)
free(user->member);
#ifdef ACLS
if (user->acl)
free(user->acl);
# ifdef UENABLE
if (user->enable)
free(user->enable);
if (user->enableacl)
free(user->enableacl);
# endif
#endif
if (user->expires)
free(user->expires);
if (user->arap)
free(user->arap);
if (user->chap)
free(user->chap);
#ifdef MSCHAP
if (user->mschap)
free(user->mschap);
#endif /* MSCHAP */
if (user->pap)
free(user->pap);
if (user->opap)
free(user->opap);
if (user->global)
free(user->global);
if (user->msg)
free(user->msg);
if (user->before_author)
free(user->before_author);
if (user->after_author)
free(user->after_author);
free_svcs(user->svcs);
}
/*
* Exported routines
*/
/* Free all allocated structures preparatory to re-reading the config file */
void
cfg_clean_config(void)
{
int i;
USER *entry, *next;
HOST *host_entry, *hn;
#ifdef ACLS
ACL *aentry, *anext;
#endif
if (authen_default) {
free(authen_default);
authen_default = NULL;
}
if (session.key) {
free(session.key);
session.key = NULL;
}
if (session.acctfile) {
free(session.acctfile);
session.acctfile = NULL;
}
session.flags = 0;
#ifdef ACLS
/* clean the acltable */
for (i = 0; i < HASH_TAB_SIZE; i++) {
aentry = (ACL *)acltable[i];
while (aentry) {
anext = aentry->hash;
free_aclstruct(aentry);
free(aentry);
aentry = anext;
}
acltable[i] = NULL;
}
#endif
/* the grouptable */
for (i = 0; i < HASH_TAB_SIZE; i++) {
entry = (USER *)grouptable[i];
while (entry) {
next = entry->hash;
free_userstruct(entry);
free(entry);
entry = next;
}
grouptable[i] = NULL;
}
/* clean the hosttable */
for (i = 0; i < HASH_TAB_SIZE; i++) {
host_entry = (HOST *)hosttable[i];
while (host_entry) {
hn = host_entry->hash;
free_hoststruct(host_entry);
free(host_entry);
host_entry = hn;
}
hosttable[i] = NULL;
}
/* the usertable */
for (i = 0; i < HASH_TAB_SIZE; i++) {
entry = (USER *)usertable[i];
while (entry) {
next = entry->hash;
free_userstruct(entry);
free(entry);
entry = next;
}
usertable[i] = NULL;
}
}
static int
parse_permission(void)
{
int symbol = sym_code;
if (sym_code != S_permit && sym_code != S_deny) {
parse_error("expecting permit or deny but found '%s' on line %d",
sym_buf, sym_line);
return(0);
}
sym_get();
return(symbol);
}
static int
parse(int symbol)
{
if (sym_code != symbol) {
parse_error("expecting '%s' but found '%s' on line %d",
(symbol == S_string ? "string" : codestring(symbol)),
sym_buf, sym_line);
return(1);
}
sym_get();
return(0);
}
static int
parse_opt_svc_default(void)
{
if (sym_code != S_default) {
return(0);
}
parse(S_default);
parse(S_svc);
parse(S_separator);
if (sym_code == S_permit) {
parse(S_permit);
return(S_permit);
}
parse(S_deny);
return(S_deny);
}
static int
parse_opt_attr_default(void)
{
if (sym_code != S_default)
return(S_deny);
parse(S_default);
parse(S_attr);
parse(S_separator);
parse(S_permit);
return(S_permit);
}
#ifdef ACLS
/* insert an acl entry into the named acl node list */
static int
insert_acl_entry(ACL *acl, int isdeny)
{
char buf[256];
NODE *next = acl->nodes;
NODE *entry = (NODE *)tac_malloc(sizeof(NODE));
int ecode;
memset(entry, 0, sizeof(NODE));
entry->type = isdeny;
entry->value = tac_strdup(sym_buf);
entry->line = sym_line;
/* compile the regex */
entry->value1 = tac_malloc(sizeof(regex_t));
ecode = regcomp((regex_t *)entry->value1, (char *)entry->value,
(REG_EXTENDED | REG_NOSUB));
if (ecode) {
regerror(ecode, (regex_t *)entry->value1, buf, 256);
report(LOG_ERR, "in regex %s on line %d", sym_buf, sym_line);
report(LOG_ERR, "regex compile failed: %s", buf);
tac_exit(1);
}
if (acl->nodes == NULL) {
acl->nodes = entry;
return(0);
}
while (next->next != NULL) {
next = next->next;
}
next->next = entry;
return(0);
}
/* parse the acl = NAME { allow = regex deny = regex } */
static int
parse_acl(void)
{
ACL *n;
ACL *acl = (ACL *)tac_malloc(sizeof(ACL));
int isdeny = S_permit;
memset(acl, 0, sizeof(ACL));
sym_get();
parse(S_separator);
acl->name = tac_strdup(sym_buf);
acl->line = sym_line;
n = hash_add_entry(acltable, (void *)acl);
if (n) {
parse_error("multiply defined acl %s on lines %d and %d", acl->name,
n->line, sym_line);
return(1);
}
sym_get();
parse(S_openbra);
while (1) {
switch (sym_code) {
case S_eof:
return(0);
case S_deny:
isdeny = S_deny;
case S_permit:
sym_get();
parse(S_separator);
insert_acl_entry(acl, isdeny);
parse(S_string);
isdeny = S_permit;
continue;
case S_closebra:
parse(S_closebra);
return(0);
default:
parse_error("Unrecognised keyword %s for acl on line %d", sym_buf,
sym_line);
return(0);
}
}
}
#endif
/*
* Parse lines in the config file, creating data structures.
* Return 1 on error, otherwise 0
*/
static int
parse_decls()
{
sym_code = 0;
rch();
#ifdef ACLS
memset(acltable, 0, sizeof(acltable));
#endif
memset(grouptable, 0, sizeof(grouptable));
memset(usertable, 0, sizeof(usertable));
memset(hosttable, 0, sizeof(hosttable));
sym_get();
/* Top level of parser */
while (1) {
switch (sym_code) {
case S_eof:
return(0);
case S_accounting:
sym_get();
switch(sym_code) {
case S_file:
parse(S_file);
parse(S_separator);
if (session.acctfile != NULL)
free(session.acctfile);
session.acctfile = tac_strdup(sym_buf);
break;
case S_syslog:
session.flags |= SESS_FLAG_ACCTSYSL;
break;
}
sym_get();
continue;
case S_default:
sym_get();
switch (sym_code) {
default:
parse_error("Expecting default authentication on line %d",
sym_line);
return(1);
case S_authentication:
if (authen_default) {
parse_error("Multiply defined authentication default on "
"line %d", sym_line);
return(1);
}
parse(S_authentication);
parse(S_separator);
parse(S_file);
authen_default = tac_strdup(sym_buf);
sym_get();
continue;
}
case S_key:
/* Process a key declaration. */
sym_get();
parse(S_separator);
if (session.key) {
parse_error("multiply defined key on lines %d and %d",
session.keyline, sym_line);
return(1);
}
session.key = tac_strdup(sym_buf);
session.keyline = sym_line;
sym_get();
continue;
case S_host:
parse_host();
continue;
case S_user:
case S_group:
parse_user();
continue;
#ifdef ACLS
case S_acl:
parse_acl();
continue;
#endif
case S_logging:
parse_logging();
continue;
default:
parse_error("Unrecognised token %s on line %d", sym_buf, sym_line);
return(1);
}
}
}
/*
* Assign a value to a field. Issue an error message and return 1 if
* it has already been assigned. This is a macro because I was sick of
* repeating the same code fragment over and over.
*/
#define ASSIGN(field) \
sym_get(); parse(S_separator); if (field) { \
parse_error("Duplicate value for %s %s and %s on line %d", \
codestring(sym_code), field, sym_buf, sym_line); \
tac_exit(1); \
} \
field = tac_strdup(sym_buf);
static int
parse_host(void)
{
HOST *h;
HOST *host = (HOST *)tac_malloc(sizeof(HOST));
char buf[MAX_INPUT_LINE_LEN];
memset(host, 0, sizeof(HOST));
sym_get();
parse(S_separator);
host->name = tac_strdup(sym_buf);
host->line = sym_line;
h = hash_add_entry(hosttable, (void *)host);
if (h) {
parse_error("multiply defined %s on lines %d and %d", host->name,
h->line, sym_line);
return(1);
}
sym_get();
parse(S_openbra);
while (1) {
switch (sym_code) {
case S_eof:
return(0);
case S_key:
ASSIGN(host->key);
sym_get();
continue;
case S_prompt:
ASSIGN(host->prompt);
sym_get();
continue;
case S_enable:
if (host->enable) {
parse_error("Duplicate value for %s %s and %s on line %d",
codestring(sym_code), host->enable, sym_buf,
sym_line);
tac_exit(1);
}
sym_get();
parse(S_separator);
switch(sym_code) {
case S_cleartext:
case S_des:
sprintf(buf, "%s ", sym_buf);
sym_get();
/* XXX: naughty, this should check the size */
strcat(buf, sym_buf);
host->enable = tac_strdup(buf);
break;
case S_nopasswd:
/* set to dummy string, so that we detect a duplicate
* password definition attempt
*/
host->enable = tac_strdup(nopasswd_str);
host->noenablepwd = 1;
break;
default:
parse_error("expecting 'cleartext' or 'des' keyword after "
"'enable =' on line %d", sym_line);
}
sym_get();
continue;
case S_closebra:
parse(S_closebra);
return(0);
default:
parse_error("Unrecognised keyword %s for host %s on line %d",
sym_buf, host->name,sym_line);
return(0);
}
}
}
/*
* Parse logging statement.
* Return 1 on error, otherwise 0
*/
static int
parse_logging(void)
{
struct _facs { char *name;
int level;
} facs[] = { {"auth", LOG_AUTH},
{"cron", LOG_CRON},
{"daemon", LOG_DAEMON},
#ifdef LOG_FTP
{"ftp", LOG_FTP},
#endif
{"kern", LOG_KERN},
{"local0", LOG_LOCAL0},
{"local1", LOG_LOCAL1},
{"local2", LOG_LOCAL2},
{"local3", LOG_LOCAL3},
{"local4", LOG_LOCAL4},
{"local5", LOG_LOCAL5},
{"local6", LOG_LOCAL6},
{"local7", LOG_LOCAL7},
{"lpr", LOG_LPR},
{"mail", LOG_MAIL},
{"news", LOG_NEWS},
{"syslog", LOG_SYSLOG},
{"user", LOG_USER},
{"uucp", LOG_UUCP},
{NULL, 0}
};
int fac;
sym_get();
parse(S_separator);
for (fac = 0; sym_code == S_string && facs[fac].name != NULL; fac++) {
if (strcmp(sym_buf, facs[fac].name) == 0)
break;
}
if (facs[fac].name == NULL)
parse_error("expecting syslog facility on line %d, got %s", sym_line,
sym_buf);
facility = facs[fac].level;
closelog();
open_logfile();
sym_get();