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|
/*
passwd.c - password entry lookup routines
Parts of this file were part of the nss_ldap library (as ldap-pwd.c)
which has been forked into the nss-pam-ldapd library.
Copyright (C) 1997-2005 Luke Howard
Copyright (C) 2006 West Consulting
Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <pthread.h>
#include "common.h"
#include "log.h"
#include "myldap.h"
#include "cfg.h"
#include "attmap.h"
#include "common/dict.h"
/* ( nisSchema.2.0 NAME 'posixAccount' SUP top AUXILIARY
* DESC 'Abstraction of an account with POSIX attributes'
* MUST ( cn $ uid $ uidNumber $ gidNumber $ homeDirectory )
* MAY ( userPassword $ loginShell $ gecos $ description ) )
*/
/* the search base for searches */
const char *passwd_bases[NSS_LDAP_CONFIG_MAX_BASES] = { NULL };
/* the search scope for searches */
int passwd_scope = LDAP_SCOPE_DEFAULT;
/* the basic search filter for searches */
const char *passwd_filter = "(objectClass=posixAccount)";
/* the attributes used in searches */
const char *attmap_passwd_uid = "uid";
const char *attmap_passwd_userPassword = "userPassword";
const char *attmap_passwd_uidNumber = "uidNumber";
const char *attmap_passwd_gidNumber = "gidNumber";
const char *attmap_passwd_gecos = "\"${gecos:-$cn}\"";
const char *attmap_passwd_homeDirectory = "homeDirectory";
const char *attmap_passwd_loginShell = "loginShell";
/* default values for attributes */
static const char *default_passwd_userPassword = "*"; /* unmatchable */
/* Note that the resulting password value should be one of:
<empty> - no password set, allow login without password
* - often used to prevent logins
x - "valid" encrypted password that does not match any valid password
often used to indicate that the password is defined elsewhere
other - encrypted password, usually in crypt(3) format */
/* the attribute list to request with searches */
static const char **passwd_attrs=NULL;
/* create a search filter for searching a passwd entry
by name, return -1 on errors */
static int mkfilter_passwd_byname(const char *name,
char *buffer,size_t buflen)
{
char safename[300];
/* escape attribute */
if(myldap_escape(name,safename,sizeof(safename)))
return -1;
/* build filter */
return mysnprintf(buffer,buflen,
"(&%s(%s=%s))",
passwd_filter,
attmap_passwd_uid,safename);
}
/* create a search filter for searching a passwd entry
by uid, return -1 on errors */
static int mkfilter_passwd_byuid(uid_t uid,
char *buffer,size_t buflen)
{
return mysnprintf(buffer,buflen,
"(&%s(%s=%d))",
passwd_filter,
attmap_passwd_uidNumber,(int)uid);
}
void passwd_init(void)
{
int i;
SET *set;
/* set up search bases */
if (passwd_bases[0]==NULL)
for (i=0;i<NSS_LDAP_CONFIG_MAX_BASES;i++)
passwd_bases[i]=nslcd_cfg->ldc_bases[i];
/* set up scope */
if (passwd_scope==LDAP_SCOPE_DEFAULT)
passwd_scope=nslcd_cfg->ldc_scope;
/* set up attribute list */
set=set_new();
attmap_add_attributes(set,"objectClass"); /* for testing shadowAccount */
attmap_add_attributes(set,attmap_passwd_uid);
attmap_add_attributes(set,attmap_passwd_userPassword);
attmap_add_attributes(set,attmap_passwd_uidNumber);
attmap_add_attributes(set,attmap_passwd_gidNumber);
attmap_add_attributes(set,attmap_passwd_gecos);
attmap_add_attributes(set,attmap_passwd_homeDirectory);
attmap_add_attributes(set,attmap_passwd_loginShell);
passwd_attrs=set_tolist(set);
set_free(set);
}
/* the cache that is used in dn2uid() */
static pthread_mutex_t dn2uid_cache_mutex=PTHREAD_MUTEX_INITIALIZER;
static DICT *dn2uid_cache=NULL;
struct dn2uid_cache_entry
{
time_t timestamp;
char *uid;
};
#define DN2UID_CACHE_TIMEOUT (15*60)
/* Perform an LDAP lookup to translate the DN into a uid.
This function either returns NULL or a strdup()ed string. */
char *lookup_dn2uid(MYLDAP_SESSION *session,const char *dn,int *rcp)
{
MYLDAP_SEARCH *search;
MYLDAP_ENTRY *entry;
static const char *attrs[2];
int rc=LDAP_SUCCESS;
const char **values;
char *uid;
if (rcp==NULL)
rcp=&rc;
/* we have to look up the entry */
attrs[0]=attmap_passwd_uid;
attrs[1]=NULL;
search=myldap_search(session,dn,LDAP_SCOPE_BASE,passwd_filter,attrs,rcp);
if (search==NULL)
{
log_log(LOG_WARNING,"lookup of user %s failed: %s",dn,ldap_err2string(*rcp));
return NULL;
}
entry=myldap_get_entry(search,rcp);
if (entry==NULL)
{
if (*rcp!=LDAP_SUCCESS)
log_log(LOG_WARNING,"lookup of user %s failed: %s",dn,ldap_err2string(*rcp));
return NULL;
}
/* get uid (just use first one) */
values=myldap_get_values(entry,attmap_passwd_uid);
/* check the result for presence and validity */
if ((values!=NULL)&&(values[0]!=NULL)&&isvalidname(values[0]))
uid=strdup(values[0]);
else
uid=NULL;
myldap_search_close(search);
return uid;
}
/* Translate the DN into a user name. This function tries several aproaches
at getting the user name, including looking in the DN for a uid attribute,
looking in the cache and falling back to looking up a uid attribute in a
LDAP query. */
char *dn2uid(MYLDAP_SESSION *session,const char *dn,char *buf,size_t buflen)
{
struct dn2uid_cache_entry *cacheentry=NULL;
char *uid;
/* check for empty string */
if ((dn==NULL)||(*dn=='\0'))
return NULL;
/* try to look up uid within DN string */
if (myldap_cpy_rdn_value(dn,attmap_passwd_uid,buf,buflen)!=NULL)
{
/* check if it is valid */
if (!isvalidname(buf))
return NULL;
return buf;
}
/* see if we have a cached entry */
pthread_mutex_lock(&dn2uid_cache_mutex);
if (dn2uid_cache==NULL)
dn2uid_cache=dict_new();
if ((dn2uid_cache!=NULL) && ((cacheentry=dict_get(dn2uid_cache,dn))!=NULL))
{
/* if the cached entry is still valid, return that */
if (time(NULL) < (cacheentry->timestamp+DN2UID_CACHE_TIMEOUT))
{
if ((cacheentry->uid!=NULL)&&(strlen(cacheentry->uid)<buflen))
strcpy(buf,cacheentry->uid);
else
buf=NULL;
pthread_mutex_unlock(&dn2uid_cache_mutex);
return buf;
}
/* leave the entry intact, just replace the uid below */
}
pthread_mutex_unlock(&dn2uid_cache_mutex);
/* look up the uid using an LDAP query */
uid=lookup_dn2uid(session,dn,NULL);
/* store the result in the cache */
pthread_mutex_lock(&dn2uid_cache_mutex);
if (cacheentry==NULL)
{
/* allocate a new entry in the cache */
cacheentry=(struct dn2uid_cache_entry *)malloc(sizeof(struct dn2uid_cache_entry));
if (cacheentry!=NULL)
dict_put(dn2uid_cache,dn,cacheentry);
}
else if (cacheentry->uid!=NULL)
free(cacheentry->uid);
/* update the cache entry */
if (cacheentry!=NULL)
{
cacheentry->timestamp=time(NULL);
cacheentry->uid=uid;
}
pthread_mutex_unlock(&dn2uid_cache_mutex);
/* copy the result into the buffer */
if ((uid!=NULL)&&(strlen(uid)<buflen))
strcpy(buf,uid);
else
buf=NULL;
return buf;
}
MYLDAP_ENTRY *uid2entry(MYLDAP_SESSION *session,const char *uid)
{
MYLDAP_SEARCH *search=NULL;
MYLDAP_ENTRY *entry=NULL;
const char *base;
int i;
static const char *attrs[2];
char filter[1024];
/* if it isn't a valid username, just bail out now */
if (!isvalidname(uid))
return NULL;
/* set up attributes (we don't need much) */
attrs[0]=attmap_passwd_uid;
attrs[1]=NULL;
/* we have to look up the entry */
mkfilter_passwd_byname(uid,filter,sizeof(filter));
for (i=0;(i<NSS_LDAP_CONFIG_MAX_BASES)&&((base=passwd_bases[i])!=NULL);i++)
{
search=myldap_search(session,base,passwd_scope,filter,attrs,NULL);
if (search==NULL)
return NULL;
entry=myldap_get_entry(search,NULL);
if (entry!=NULL)
return entry;
}
return NULL;
}
char *uid2dn(MYLDAP_SESSION *session,const char *uid,char *buf,size_t buflen)
{
MYLDAP_ENTRY *entry;
/* look up the entry */
entry=uid2entry(session,uid);
if (entry==NULL)
return NULL;
/* get DN */
return myldap_cpy_dn(entry,buf,buflen);
}
/* the maximum number of uidNumber attributes per entry */
#define MAXUIDS_PER_ENTRY 5
static int write_passwd(TFILE *fp,MYLDAP_ENTRY *entry,const char *requser,
const uid_t *requid,uid_t calleruid)
{
int32_t tmpint32;
const char **tmpvalues;
char *tmp;
const char **usernames;
const char *passwd;
uid_t uids[MAXUIDS_PER_ENTRY];
int numuids;
char gidbuf[32];
gid_t gid;
char gecos[1024];
char homedir[256];
char shell[100];
int i,j;
/* get the usernames for this entry */
usernames=myldap_get_values(entry,attmap_passwd_uid);
if ((usernames==NULL)||(usernames[0]==NULL))
{
log_log(LOG_WARNING,"passwd entry %s does not contain %s value",
myldap_get_dn(entry),attmap_passwd_uid);
return 0;
}
/* get the password for this entry */
if (myldap_has_objectclass(entry,"shadowAccount"))
{
/* if the entry has a shadowAccount entry, point to that instead */
passwd="x";
}
else
{
passwd=get_userpassword(entry,attmap_passwd_userPassword);
if ((passwd==NULL)||(calleruid!=0))
passwd=default_passwd_userPassword;
}
/* get the uids for this entry */
if (requid!=NULL)
{
uids[0]=*requid;
numuids=1;
}
else
{
tmpvalues=myldap_get_values(entry,attmap_passwd_uidNumber);
if ((tmpvalues==NULL)||(tmpvalues[0]==NULL))
{
log_log(LOG_WARNING,"passwd entry %s does not contain %s value",
myldap_get_dn(entry),attmap_passwd_uidNumber);
return 0;
}
for (numuids=0;(numuids<MAXUIDS_PER_ENTRY)&&(tmpvalues[numuids]!=NULL);numuids++)
{
errno=0;
uids[numuids]=strtouid(tmpvalues[numuids],&tmp,0);
if ((*(tmpvalues[numuids])=='\0')||(*tmp!='\0'))
{
log_log(LOG_WARNING,"passwd entry %s contains non-numeric %s value",
myldap_get_dn(entry),attmap_passwd_uidNumber);
return 0;
}
else if (errno!=0)
{
log_log(LOG_WARNING,"passwd entry %s contains too large %s value",
myldap_get_dn(entry),attmap_passwd_uidNumber);
return 0;
}
}
}
/* get the gid for this entry */
attmap_get_value(entry,attmap_passwd_gidNumber,gidbuf,sizeof(gidbuf));
if (gidbuf[0]=='\0')
{
log_log(LOG_WARNING,"passwd entry %s does not contain %s value",
myldap_get_dn(entry),attmap_passwd_gidNumber);
return 0;
}
errno=0;
gid=strtogid(gidbuf,&tmp,0);
if ((gidbuf[0]=='\0')||(*tmp!='\0'))
{
log_log(LOG_WARNING,"passwd entry %s contains non-numeric %s value",
myldap_get_dn(entry),attmap_passwd_gidNumber);
return 0;
}
else if (errno!=0)
{
log_log(LOG_WARNING,"passwd entry %s contains too large %s value",
myldap_get_dn(entry),attmap_passwd_gidNumber);
return 0;
}
/* get the gecos for this entry */
attmap_get_value(entry,attmap_passwd_gecos,gecos,sizeof(gecos));
/* get the home directory for this entry */
attmap_get_value(entry,attmap_passwd_homeDirectory,homedir,sizeof(homedir));
if (homedir[0]=='\0')
log_log(LOG_WARNING,"passwd entry %s does not contain %s value",
myldap_get_dn(entry),attmap_passwd_homeDirectory);
/* get the shell for this entry */
attmap_get_value(entry,attmap_passwd_loginShell,shell,sizeof(shell));
/* write the entries */
for (i=0;usernames[i]!=NULL;i++)
if ((requser==NULL)||(strcmp(requser,usernames[i])==0))
{
if (!isvalidname(usernames[i]))
{
log_log(LOG_WARNING,"passwd entry %s contains invalid user name: \"%s\"",
myldap_get_dn(entry),usernames[i]);
}
else
{
for (j=0;j<numuids;j++)
{
WRITE_INT32(fp,NSLCD_RESULT_BEGIN);
WRITE_STRING(fp,usernames[i]);
WRITE_STRING(fp,passwd);
WRITE_TYPE(fp,uids[j],uid_t);
WRITE_TYPE(fp,gid,gid_t);
WRITE_STRING(fp,gecos);
WRITE_STRING(fp,homedir);
WRITE_STRING(fp,shell);
}
}
}
return 0;
}
NSLCD_HANDLE_UID(
passwd,byname,
char name[256];
char filter[1024];
READ_STRING(fp,name);
if (!isvalidname(name)) {
log_log(LOG_WARNING,"nslcd_passwd_byname(%s): invalid user name",name);
return -1;
},
log_log(LOG_DEBUG,"nslcd_passwd_byname(%s)",name);,
NSLCD_ACTION_PASSWD_BYNAME,
mkfilter_passwd_byname(name,filter,sizeof(filter)),
write_passwd(fp,entry,name,NULL,calleruid)
)
NSLCD_HANDLE_UID(
passwd,byuid,
uid_t uid;
char filter[1024];
READ_TYPE(fp,uid,uid_t);,
log_log(LOG_DEBUG,"nslcd_passwd_byuid(%d)",(int)uid);,
NSLCD_ACTION_PASSWD_BYUID,
mkfilter_passwd_byuid(uid,filter,sizeof(filter)),
write_passwd(fp,entry,NULL,&uid,calleruid)
)
NSLCD_HANDLE_UID(
passwd,all,
const char *filter;
/* no parameters to read */,
log_log(LOG_DEBUG,"nslcd_passwd_all()");,
NSLCD_ACTION_PASSWD_ALL,
(filter=passwd_filter,0),
write_passwd(fp,entry,NULL,NULL,calleruid)
)
|