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/*
common.c - common server code routines
This file is part of the nss-pam-ldapd library.
Copyright (C) 2006 West Consulting
Copyright (C) 2006, 2007, 2008, 2009, 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 <stdarg.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <strings.h>
#include <limits.h>
#include "nslcd.h"
#include "common.h"
#include "log.h"
/* simple wrapper around snptintf() to return non-0 in case
of any failure (but always keep string 0-terminated) */
int mysnprintf(char *buffer,size_t buflen,const char *format, ...)
{
int res;
va_list ap;
/* do snprintf */
va_start(ap,format);
res=vsnprintf(buffer,buflen,format,ap);
/* NULL-terminate the string just to be on the safe side */
buffer[buflen-1]='\0';
/* check if the string was completely written */
return ((res<0)||(((size_t)res)>=buflen));
}
const char *get_userpassword(MYLDAP_ENTRY *entry,const char *attr)
{
const char **values;
int i;
/* get the entries */
values=myldap_get_values(entry,attr);
if ((values==NULL)||(values[0]==NULL))
return NULL;
/* go over the entries and return the remainder of the value if it
starts with {crypt} or crypt$ */
for (i=0;values[i]!=NULL;i++)
{
if (strncasecmp(values[i],"{crypt}",7)==0)
return values[i]+7;
if (strncasecmp(values[i],"crypt$",6)==0)
return values[i]+6;
}
/* just return the first value completely */
return values[0];
/* TODO: support more password formats e.g. SMD5
(which is $1$ but in a different format)
(any code for this is more than welcome) */
}
/*
Checks to see if the specified name seems to be a valid user or group name.
This test is based on the definition from POSIX (IEEE Std 1003.1, 2004,
3.426 User Name, 3.189 Group Name and 3.276 Portable Filename Character Set):
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_426
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_189
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
The standard defines user names valid if they contain characters from
the set [A-Za-z0-9._-] where the hyphen should not be used as first
character. As an extension this test allows some more characters.
*/
int isvalidname(const char *name)
{
int i;
if ((name==NULL)||(name[0]=='\0'))
return 0;
/* check characters */
for (i=0;name[i]!='\0';i++)
{
#ifdef LOGIN_NAME_MAX
if (i>=LOGIN_NAME_MAX)
return 0;
#endif /* LOGIN_NAME_MAX */
if ( ! ( ( (i!=0) && (name[i]=='-') ) ||
( (i!=0) && (name[i]=='\\') && name[i+1]!='\0' ) ||
(name[i]>='@' && name[i] <= 'Z') ||
(name[i]>='a' && name[i] <= 'z') ||
(name[i]>='0' && name[i] <= '9') ||
name[i]=='.' || name[i]=='_' || name[i]=='$' || name[i]==' ') )
return 0;
}
/* no test failed so it must be good */
return -1;
}
/* this writes a single address to the stream */
int write_address(TFILE *fp,const char *addr)
{
int32_t tmpint32;
struct in_addr ipv4addr;
struct in6_addr ipv6addr;
/* try to parse the address as IPv4 first, fall back to IPv6 */
if (inet_pton(AF_INET,addr,&ipv4addr)>0)
{
/* write address type */
WRITE_INT32(fp,AF_INET);
/* write the address length */
WRITE_INT32(fp,sizeof(struct in_addr));
/* write the address itself (in network byte order) */
WRITE_TYPE(fp,ipv4addr,struct in_addr);
}
else if (inet_pton(AF_INET6,addr,&ipv6addr)>0)
{
/* write address type */
WRITE_INT32(fp,AF_INET6);
/* write the address length */
WRITE_INT32(fp,sizeof(struct in6_addr));
/* write the address itself (in network byte order) */
WRITE_TYPE(fp,ipv6addr,struct in6_addr);
}
else
{
/* failure, log but write simple invalid address
(otherwise the address list is messed up) */
/* TODO: have error message in correct format */
log_log(LOG_WARNING,"unparseble address: %s",addr);
/* write an illegal address type */
WRITE_INT32(fp,-1);
/* write an emtpy address */
WRITE_INT32(fp,0);
}
/* we're done */
return 0;
}
int read_address(TFILE *fp,char *addr,int *addrlen,int *af)
{
int32_t tmpint32;
int len;
/* read address family */
READ_INT32(fp,*af);
if ((*af!=AF_INET)&&(*af!=AF_INET6))
{
log_log(LOG_WARNING,"incorrect address family specified: %d",*af);
return -1;
}
/* read address length */
READ_INT32(fp,len);
if ((len>*addrlen)||(len<=0))
{
log_log(LOG_WARNING,"address length incorrect: %d",len);
return -1;
}
*addrlen=len;
/* read address */
READ(fp,addr,len);
/* we're done */
return 0;
}
#ifdef WANT_STRTOUI
/* provide a strtoui() implementation, similar to strtoul() but returning
an range-checked unsigned int instead */
unsigned int strtoui(const char *nptr,char **endptr,int base)
{
unsigned long val;
val=strtoul(nptr,endptr,base);
if (val>UINT_MAX)
{
errno=ERANGE;
return UINT_MAX;
}
/* If errno was set by strtoull, we'll pass it back as-is */
return (unsigned int)val;
}
#endif /* WANT_STRTOUI */
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