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samba-mirror/source3/lib/substitute.c

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/*
Unix SMB/CIFS implementation.
string substitution functions
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Gerald Carter 2006
2009-11-21 18:17:16 +03:00
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
2009-11-21 18:17:16 +03:00
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
2009-11-21 18:17:16 +03:00
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/passwd.h"
#include "secrets.h"
#include "auth.h"
userdom_struct current_user_info;
fstring remote_proto="UNKNOWN";
/**
* Set the 'local' machine name
* @param local_name the name we are being called
* @param if this is the 'final' name for us, not be be changed again
*/
static char *local_machine;
void free_local_machine_name(void)
{
TALLOC_FREE(local_machine);
}
bool set_local_machine_name(const char *local_name, bool perm)
{
static bool already_perm = false;
char *tmp_local_machine = NULL;
size_t len;
if (already_perm) {
return true;
}
tmp_local_machine = talloc_strdup(NULL, local_name);
if (!tmp_local_machine) {
return false;
}
trim_char(tmp_local_machine,' ',' ');
TALLOC_FREE(local_machine);
len = strlen(tmp_local_machine);
local_machine = (char *)TALLOC_ZERO(NULL, len+1);
if (!local_machine) {
TALLOC_FREE(tmp_local_machine);
return false;
}
/* alpha_strcpy includes the space for the terminating nul. */
alpha_strcpy(local_machine,tmp_local_machine,
SAFE_NETBIOS_CHARS,len+1);
if (!strlower_m(local_machine)) {
TALLOC_FREE(tmp_local_machine);
return false;
}
TALLOC_FREE(tmp_local_machine);
already_perm = perm;
return true;
}
const char *get_local_machine_name(void)
{
if (!local_machine || !*local_machine) {
return lp_netbios_name();
}
return local_machine;
}
/**
* Set the 'remote' machine name
* @param remote_name the name our client wants to be called by
* @param if this is the 'final' name for them, not be be changed again
*/
static char *remote_machine;
bool set_remote_machine_name(const char *remote_name, bool perm)
{
static bool already_perm = False;
char *tmp_remote_machine;
size_t len;
if (already_perm) {
return true;
}
tmp_remote_machine = talloc_strdup(NULL, remote_name);
if (!tmp_remote_machine) {
return false;
}
trim_char(tmp_remote_machine,' ',' ');
TALLOC_FREE(remote_machine);
len = strlen(tmp_remote_machine);
remote_machine = (char *)TALLOC_ZERO(NULL, len+1);
if (!remote_machine) {
TALLOC_FREE(tmp_remote_machine);
return false;
}
/* alpha_strcpy includes the space for the terminating nul. */
alpha_strcpy(remote_machine,tmp_remote_machine,
SAFE_NETBIOS_CHARS,len+1);
if (!strlower_m(remote_machine)) {
TALLOC_FREE(tmp_remote_machine);
return false;
}
TALLOC_FREE(tmp_remote_machine);
already_perm = perm;
return true;
}
const char *get_remote_machine_name(void)
{
return remote_machine ? remote_machine : "";
}
/*******************************************************************
Setup the string used by %U substitution.
********************************************************************/
static char *smb_user_name;
void sub_set_smb_name(const char *name)
{
char *tmp;
size_t len;
bool is_machine_account = false;
/* don't let anonymous logins override the name */
if (!name || !*name) {
return;
}
tmp = talloc_strdup(NULL, name);
if (!tmp) {
return;
}
trim_char(tmp, ' ', ' ');
if (!strlower_m(tmp)) {
TALLOC_FREE(tmp);
return;
}
len = strlen(tmp);
if (len == 0) {
TALLOC_FREE(tmp);
return;
}
/* long story but here goes....we have to allow usernames
ending in '$' as they are valid machine account names.
So check for a machine account and re-add the '$'
at the end after the call to alpha_strcpy(). --jerry */
if (tmp[len-1] == '$') {
is_machine_account = True;
}
TALLOC_FREE(smb_user_name);
smb_user_name = (char *)TALLOC_ZERO(NULL, len+1);
if (!smb_user_name) {
TALLOC_FREE(tmp);
return;
}
/* alpha_strcpy includes the space for the terminating nul. */
alpha_strcpy(smb_user_name, tmp,
SAFE_NETBIOS_CHARS,
len+1);
TALLOC_FREE(tmp);
if (is_machine_account) {
len = strlen(smb_user_name);
smb_user_name[len-1] = '$';
}
}
static char sub_peeraddr[INET6_ADDRSTRLEN];
static const char *sub_peername = NULL;
static char sub_sockaddr[INET6_ADDRSTRLEN];
void sub_set_socket_ids(const char *peeraddr, const char *peername,
const char *sockaddr)
{
const char *addr = peeraddr;
if (strnequal(addr, "::ffff:", 7)) {
addr += 7;
}
strlcpy(sub_peeraddr, addr, sizeof(sub_peeraddr));
if (sub_peername != NULL &&
sub_peername != sub_peeraddr) {
talloc_free(discard_const_p(char,sub_peername));
sub_peername = NULL;
}
sub_peername = talloc_strdup(NULL, peername);
if (sub_peername == NULL) {
sub_peername = sub_peeraddr;
}
/*
* Shouldn't we do the ::ffff: cancellation here as well? The
* original code in talloc_sub_basic() did not do it, so I'm
* leaving it out here as well for compatibility.
*/
strlcpy(sub_sockaddr, sockaddr, sizeof(sub_sockaddr));
}
static const char *get_smb_user_name(void)
{
return smb_user_name ? smb_user_name : "";
}
/*******************************************************************
Setup the strings used by substitutions. Called per packet. Ensure
%U name is set correctly also.
smb_name must be sanitized by alpha_strcpy
********************************************************************/
void set_current_user_info(const char *smb_name, const char *unix_name,
const char *domain)
{
fstrcpy(current_user_info.smb_name, smb_name);
fstrcpy(current_user_info.unix_name, unix_name);
fstrcpy(current_user_info.domain, domain);
/* The following is safe as current_user_info.smb_name
* has already been sanitised in register_existing_vuid. */
sub_set_smb_name(current_user_info.smb_name);
}
/*******************************************************************
Return the current active user name.
*******************************************************************/
const char *get_current_username(void)
{
if (current_user_info.smb_name[0] == '\0' ) {
return get_smb_user_name();
}
return current_user_info.smb_name;
}
/*******************************************************************
Given a pointer to a %$(NAME) in p and the whole string in str
expand it as an environment variable.
str must be a talloced string.
Return a new allocated and expanded string.
Based on code by Branko Cibej <branko.cibej@hermes.si>
When this is called p points at the '%' character.
May substitute multiple occurrencies of the same env var.
********************************************************************/
static char *realloc_expand_env_var(char *str, char *p)
{
char *envname;
char *envval;
char *q, *r;
int copylen;
if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
return str;
}
/*
* Look for the terminating ')'.
*/
if ((q = strchr_m(p,')')) == NULL) {
DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
return str;
}
/*
* Extract the name from within the %$(NAME) string.
*/
r = p + 3;
copylen = q - r;
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/* reserve space for use later add %$() chars */
if ( (envname = talloc_array(talloc_tos(), char, copylen + 1 + 4)) == NULL ) {
return NULL;
}
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strncpy(envname,r,copylen);
envname[copylen] = '\0';
if ((envval = getenv(envname)) == NULL) {
DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
TALLOC_FREE(envname);
return str;
}
/*
* Copy the full %$(NAME) into envname so it
* can be replaced.
*/
copylen = q + 1 - p;
strncpy(envname,p,copylen);
envname[copylen] = '\0';
r = realloc_string_sub(str, envname, envval);
TALLOC_FREE(envname);
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return r;
}
/*******************************************************************
Patch from jkf@soton.ac.uk
Added this to implement %p (NIS auto-map version of %H)
*******************************************************************/
static const char *automount_path(const char *user_name)
{
TALLOC_CTX *ctx = talloc_tos();
const char *server_path;
/* use the passwd entry as the default */
/* this will be the default if WITH_AUTOMOUNT is not used or fails */
server_path = talloc_strdup(ctx, get_user_home_dir(ctx, user_name));
if (!server_path) {
return "";
}
#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
if (lp_nis_home_map()) {
const char *home_path_start;
char *automount_value = automount_lookup(ctx, user_name);
if(automount_value && strlen(automount_value) > 0) {
home_path_start = strchr_m(automount_value,':');
if (home_path_start != NULL) {
DEBUG(5, ("NIS lookup succeeded. "
"Home path is: %s\n",
home_path_start ?
(home_path_start+1):""));
server_path = talloc_strdup(ctx,
home_path_start+1);
if (!server_path) {
server_path = "";
}
}
} else {
/* NIS key lookup failed: default to
* user home directory from password file */
DEBUG(5, ("NIS lookup failed. Using Home path from "
"passwd file. Home path is: %s\n", server_path ));
}
}
#endif
DEBUG(4,("Home server path: %s\n", server_path));
return server_path;
}
/*******************************************************************
Patch from jkf@soton.ac.uk
This is Luke's original function with the NIS lookup code
moved out to a separate function.
*******************************************************************/
static const char *automount_server(const char *user_name)
{
TALLOC_CTX *ctx = talloc_tos();
const char *server_name;
const char *local_machine_name = get_local_machine_name();
/* use the local machine name as the default */
/* this will be the default if WITH_AUTOMOUNT is not used or fails */
if (local_machine_name && *local_machine_name) {
server_name = talloc_strdup(ctx, local_machine_name);
} else {
server_name = talloc_strdup(ctx, lp_netbios_name());
}
if (!server_name) {
return "";
}
#if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
if (lp_nis_home_map()) {
char *p;
char *srv;
char *automount_value = automount_lookup(ctx, user_name);
if (!automount_value) {
return "";
}
srv = talloc_strdup(ctx, automount_value);
if (!srv) {
return "";
}
p = strchr_m(srv, ':');
if (!p) {
return "";
}
*p = '\0';
server_name = srv;
DEBUG(5, ("NIS lookup succeeded. Home server %s\n",
server_name));
}
#endif
DEBUG(4,("Home server: %s\n", server_name));
return server_name;
}
/****************************************************************************
Do some standard substitutions in a string.
len is the length in bytes of the space allowed in string str. If zero means
don't allow expansions.
****************************************************************************/
void standard_sub_basic(const char *smb_name, const char *domain_name,
char *str, size_t len)
{
char *s;
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if ( (s = talloc_sub_basic(talloc_tos(), smb_name, domain_name, str )) != NULL ) {
strncpy( str, s, len );
}
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TALLOC_FREE( s );
}
/****************************************************************************
Do some standard substitutions in a string.
This function will return an talloced string that has to be freed.
****************************************************************************/
char *talloc_sub_basic(TALLOC_CTX *mem_ctx,
const char *smb_name,
const char *domain_name,
const char *str)
{
char *b, *p, *s, *r, *a_string;
fstring pidstr, vnnstr;
const char *local_machine_name = get_local_machine_name();
TALLOC_CTX *tmp_ctx = NULL;
/* workaround to prevent a crash while looking at bug #687 */
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if (!str) {
DEBUG(0,("talloc_sub_basic: NULL source string! This should not happen\n"));
return NULL;
}
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a_string = talloc_strdup(mem_ctx, str);
if (a_string == NULL) {
DEBUG(0, ("talloc_sub_basic: Out of memory!\n"));
return NULL;
}
tmp_ctx = talloc_stackframe();
for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
r = NULL;
b = a_string;
switch (*(p+1)) {
case 'U' :
r = strlower_talloc(tmp_ctx, smb_name);
if (r == NULL) {
goto error;
}
a_string = realloc_string_sub(a_string, "%U", r);
break;
case 'G' : {
struct passwd *pass;
r = talloc_strdup(tmp_ctx, smb_name);
if (r == NULL) {
goto error;
}
pass = Get_Pwnam_alloc(tmp_ctx, r);
if (pass != NULL) {
a_string = realloc_string_sub(
a_string, "%G",
gidtoname(pass->pw_gid));
}
TALLOC_FREE(pass);
break;
}
case 'D' :
r = strupper_talloc(tmp_ctx, domain_name);
if (r == NULL) {
goto error;
}
a_string = realloc_string_sub(a_string, "%D", r);
break;
case 'I' : {
a_string = realloc_string_sub(
a_string, "%I",
sub_peeraddr[0] ? sub_peeraddr : "0.0.0.0");
break;
}
case 'i':
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a_string = realloc_string_sub(
a_string, "%i",
sub_sockaddr[0] ? sub_sockaddr : "0.0.0.0");
break;
case 'L' :
if ( strncasecmp_m(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
break;
}
if (local_machine_name && *local_machine_name) {
a_string = realloc_string_sub(a_string, "%L", local_machine_name);
} else {
a_string = realloc_string_sub(a_string, "%L", lp_netbios_name());
}
break;
case 'N':
a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
break;
case 'M' :
a_string = realloc_string_sub(a_string, "%M",
sub_peername ? sub_peername : "");
break;
case 'R' :
a_string = realloc_string_sub(a_string, "%R", remote_proto);
break;
case 'T' :
a_string = realloc_string_sub(a_string, "%T", current_timestring(tmp_ctx, False));
break;
case 'a' :
a_string = realloc_string_sub(a_string, "%a",
get_remote_arch_str());
break;
case 'd' :
slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)getpid());
a_string = realloc_string_sub(a_string, "%d", pidstr);
break;
case 'h' :
a_string = realloc_string_sub(a_string, "%h", myhostname());
break;
case 'm' :
a_string = realloc_string_sub(a_string, "%m",
remote_machine
? remote_machine
: "");
break;
case 'v' :
a_string = realloc_string_sub(a_string, "%v", samba_version_string());
break;
case 'w' :
a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
break;
case '$' :
a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
break;
case 'V' :
slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
a_string = realloc_string_sub(a_string, "%V", vnnstr);
break;
default:
break;
}
p++;
TALLOC_FREE(r);
if (a_string == NULL) {
goto done;
}
}
goto done;
error:
TALLOC_FREE(a_string);
done:
TALLOC_FREE(tmp_ctx);
return a_string;
}
/****************************************************************************
Do some specific substitutions in a string.
This function will return an allocated string that have to be freed.
****************************************************************************/
char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
const char *input_string,
const char *username,
const char *grpname,
const char *domain,
uid_t uid,
gid_t gid)
{
char *a_string;
char *ret_string = NULL;
char *b, *p, *s;
TALLOC_CTX *tmp_ctx;
if (!(tmp_ctx = talloc_new(mem_ctx))) {
DEBUG(0, ("talloc_new failed\n"));
return NULL;
}
a_string = talloc_strdup(tmp_ctx, input_string);
if (a_string == NULL) {
DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
goto done;
}
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for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
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b = a_string;
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switch (*(p+1)) {
case 'U' :
a_string = talloc_string_sub(
tmp_ctx, a_string, "%U", username);
break;
case 'u' :
a_string = talloc_string_sub(
tmp_ctx, a_string, "%u", username);
break;
case 'G' :
if (gid != -1) {
const char *name;
if (grpname != NULL) {
name = grpname;
} else {
name = gidtoname(gid);
}
a_string = talloc_string_sub(tmp_ctx,
a_string,
"%G",
name);
} else {
a_string = talloc_string_sub(
tmp_ctx, a_string,
"%G", "NO_GROUP");
}
break;
case 'g' :
if (gid != -1) {
const char *name;
if (grpname != NULL) {
name = grpname;
} else {
name = gidtoname(gid);
}
a_string = talloc_string_sub(tmp_ctx,
a_string,
"%g",
name);
} else {
a_string = talloc_string_sub(
tmp_ctx, a_string, "%g", "NO_GROUP");
}
break;
case 'D' :
a_string = talloc_string_sub(tmp_ctx, a_string,
"%D", domain);
break;
case 'N' :
a_string = talloc_string_sub(
tmp_ctx, a_string, "%N",
automount_server(username));
break;
default:
break;
}
p++;
if (a_string == NULL) {
goto done;
}
}
/* Watch out, using "mem_ctx" here, so all intermediate stuff goes
* away with the TALLOC_FREE(tmp_ctx) further down. */
ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
done:
TALLOC_FREE(tmp_ctx);
return ret_string;
}
/****************************************************************************
****************************************************************************/
char *talloc_sub_advanced(TALLOC_CTX *ctx,
const char *servicename,
const char *user,
const char *connectpath,
gid_t gid,
const char *smb_name,
const char *domain_name,
const char *str)
{
char *a_string, *ret_string;
char *b, *p, *s;
a_string = talloc_strdup(talloc_tos(), str);
if (a_string == NULL) {
DEBUG(0, ("talloc_sub_advanced: Out of memory!\n"));
return NULL;
}
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for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
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b = a_string;
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switch (*(p+1)) {
case 'N' :
a_string = realloc_string_sub(a_string, "%N", automount_server(user));
break;
case 'H': {
char *h;
if ((h = get_user_home_dir(talloc_tos(), user)))
a_string = realloc_string_sub(a_string, "%H", h);
TALLOC_FREE(h);
break;
}
case 'P':
a_string = realloc_string_sub(a_string, "%P", connectpath);
break;
case 'S':
a_string = realloc_string_sub(a_string, "%S", servicename);
break;
case 'g':
a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
break;
case 'u':
a_string = realloc_string_sub(a_string, "%u", user);
break;
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/* Patch from jkf@soton.ac.uk Left the %N (NIS
* server name) in standard_sub_basic as it is
* a feature for logon servers, hence uses the
* username. The %p (NIS server path) code is
* here as it is used instead of the default
* "path =" string in [homes] and so needs the
* service name, not the username. */
case 'p':
a_string = realloc_string_sub(a_string, "%p",
automount_path(servicename));
break;
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default:
break;
}
p++;
if (a_string == NULL) {
return NULL;
}
}
ret_string = talloc_sub_basic(ctx, smb_name, domain_name, a_string);
TALLOC_FREE(a_string);
return ret_string;
}
void standard_sub_advanced(const char *servicename, const char *user,
const char *connectpath, gid_t gid,
const char *smb_name, const char *domain_name,
char *str, size_t len)
{
char *s = talloc_sub_advanced(talloc_tos(),
servicename, user, connectpath,
gid, smb_name, domain_name, str);
if (!s) {
return;
}
strlcpy( str, s, len );
TALLOC_FREE( s );
}
/******************************************************************************
version of standard_sub_basic() for string lists; uses talloc_sub_basic()
for the work
*****************************************************************************/
bool str_list_sub_basic( char **list, const char *smb_name,
const char *domain_name )
{
TALLOC_CTX *ctx = list;
char *s, *tmpstr;
while ( *list ) {
s = *list;
tmpstr = talloc_sub_basic(ctx, smb_name, domain_name, s);
if ( !tmpstr ) {
DEBUG(0,("str_list_sub_basic: "
"talloc_sub_basic() return NULL!\n"));
return false;
}
TALLOC_FREE(*list);
*list = tmpstr;
list++;
}
return true;
}