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posix_getpwnam

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_getpwnamKullanıcı adı belirtilen kullanıcı hakkında bilgi döndürür

Açıklama

posix_getpwnam(string $isim): array|false

Kullanıcı ismi isim olan kullanıcı hakkında bilgi içeren bir dizi döndürür.

Değiştirgeler

isim

Kullanıcının sistemde oturum açarken kullandığı kısa ad.

Dönen Değerler

İşlem başarısız olursa false, yoksa aşağıdaki elemanları içeren bir dizi döner:

Kullanıcı bilgileri dizisi
Anahtar Açıklama
name Kullanıcının kullanıcı ismi. Kullanıcının gerçek ismi değil, en fazla 16 karakter uzunlukta olabilen ve sistemde oturum açarken kullandığı kısa adıdır. İşlevi çağırıken isim değiştirgesine atananla aynı olmalıdır.
passwd Kullanıcının parolası bu elemanda şifreli olarak bulunur. Sistemde "shadow" parolalar kullanılıyorsa sadece bir * imi bulunur.
uid Kullanıcı kimliği.
gid Kullanıcının grup kimliği. Grup ismini ve üye listesini öğrenmek için posix_getgrgid()işlevini kullanabilirsiniz.
gecos GECOS, Honeywell sistemlerden kalma artık kullanılmayan bir alan olmakla beraber içeriği POSIX tarafından şekillendirilmiştir.Alan birbirlerinden virgül ile ayrılmış olarak kullanıcının tam ismini, iş ve ev telefonlarını ve büro numarasını içerebilir. Çoğu sistemde kullanıcının tam ismi için kullanılmaktadır.
dir Kullanıcının ev dizininin mutlak yolunu içerir.
shell Kullanıcının öntanımlı kabuğunu çalıştıran dosyanın mutlak yolu.

Örnekler

Örnek 1 - posix_getpwnam() örneği

<?php

$userinfo 
posix_getpwnam("tom");

print_r($userinfo);
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

Array
(
    [name]    => tom
    [passwd]  => x
    [uid]     => 10000
    [gid]     => 42
    [gecos]   => "tom,,,"
    [dir]     => "/home/tom"
    [shell]   => "/bin/bash"
)

Ayrıca Bakınız

  • posix_getpwuid() - Kullanıcı kimliği belirtilen kullanıcı hakkında bilgi döndürür
  • POSIX getpwnam(3) kılavuz sayfası

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User Contributed Notes 9 notes

up
3
darryl at pointclark dot net
19 years ago
If you need to validate a *real* unix password on a system using shadowed passwords, the posix_getpwnam() function in PHP won't work (as mentioned, 'x', or '*', will be in the password field).

I have a need to verify a user/pass within PHP (using SSL!).  I don't know if this is the best way, but it's what I'm doing at the moment (works well!).

First, you need some help from the OS.  I wrote a tiny C utility that does the shadow look-up for me... It requires root access to read /etc/shadow.  So after you compile (gcc -O2 -s -o spasswd -lcrypt spasswd.c), you need to either use sudo to run it, or

# chown root spasswd && chmod u+s spasswd

To code that I'm using to authenticate a user/pass from PHP looks like:

function Authenticate($realm)
{
global $PHP_AUTH_USER;
global $PHP_AUTH_PW;

if(!isset($PHP_AUTH_USER))
{
  header("WWW-Authenticate: Basic realm=\"$realm\"");
  header("HTTP/1.0 401 Unauthorized");

  return false;
}
else
{
  if(($fh = popen("/usr/sbin/spasswd", "w")))
  {
   fputs($fh, "$PHP_AUTH_USER $PHP_AUTH_PW");
   $r = pclose($fh);

   if(!$r)
    return true;
  }
}

header("WWW-Authenticate: Basic realm=\"$realm\"");
header("HTTP/1.0 401 Unauthorized");

return false;
}

The C source for spasswd.c:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <crypt.h>
#include <shadow.h>

static char salt[12], user[128], pass[128];

void die(void)
{
memset(salt, '\0', 12);
memset(user, '\0', 128);
memset(pass, '\0', 128);
}

int main(int argc, char *argv[])
{
struct spwd *passwd;

atexit(die); die();

if(fscanf(stdin, "%127s %127s", user, pass) != 2)
  return 1;

if(!(passwd = getspnam(user)))
  return 1;

strncpy(salt, passwd->sp_pwdp, 11);
strncpy(pass, crypt(pass, salt), 127);

if(!strncmp(pass, passwd->sp_pwdp, 127))
  return 0;

return 1;
}

Hope this helps someone...
up
0
bau at kg-fds dot de
15 years ago
Hello, I've tried another, more easier way to check passwords than checking it to a pop3-server. If you are running a samba-server or a Windows PDC, so you can try to connect with the username/password you want to check to the netlogon of this server:

if (exec('echo "exit"|smbclient //server/netlogon -U'.$user.' '.$pass)=="") { ... }

If the username/password doesn't match, then the exec-command under LINUX returns an error.

Good luck
Baumgrtner
up
0
bau at kg-fds dot de
15 years ago
If you are running a pop3-daemon, so you can do authentification on pop3 by using fsockopen :-) and checking whether it returns +OK or -ERR
up
0
corychristison at lavacube dot net
16 years ago
For those of you who are writing daemons with PHP and are one for security. This function will not return any info if you have called PHP's chroot() function.

Took me a few minutes why it wouldn't find the user it was searching for.
up
0
marcus at nospamsynchromedia dot co dot uk
18 years ago
Given a non-existent username, this function returns a boolean FALSE.
up
0
perreal at lyon dot cemagref dot fr
19 years ago
To check passwords on a Unix-box, look at the mod_auth_external module for Apache, it uses external programs to do the real job. The server won't ever read the encrypted password.

One of them, pwauth, can be configured to use PAM or whatever is used on your system. Users that can run this program are configured at compile time. And this program can be called from PHP with exec(...).
up
0
vision_1967 at hotmail dot com
19 years ago
I needed to get access to the user information to do login/validation via an SSL connection and encountered the same problem with receiving '*' in the password field.  After checking the documentation on posix_getpwnam, I saw a previous solution involving coding a C program.  This was a bit bulky for me so I came up with my own solution.

Variations on this theme can probably be done to make the solution more programmer/reader friendly, but the way I did it accomplished the task that I needed to do.

IF the information you need to get from posix_getpwnam comes from a host participating in an NIS network, you can accomplish the same thing with the following command:


$autharray = split(":",`ypmatch $USER passwd`);


(pretty long explanation for such a short solution huh?)

You'll have to get at the fields by their index number ($autharray[0], $autharray[1], ...) using this method.

To create an associative array that is plug-in compatible with the posix_getpwnam function,  you'll probably need to use the 'list' specifier to do the assignments.

I hope this helps someone.

--S
up
0
sezery at damla dot net
19 years ago
User and group functions do not work on recent Redhat systems since these functions are based on /etc/group file but new redhat does not put group members' list into this file. Instead you need to examine /etc/passwd file and find members of a group by checking group id.
up
-2
bau at kg-fds dot de
15 years ago
Oh I forgot the following:

to change a Users password via PHP,
you can use the following (under Linux with installed Samba):

exec('echo -e "'.$oldpassword.'\n'.$newpassword.'\n'.$newpassword.'
"|smbpasswd -U'.$user.' -s')

The exec-command returns ""
if an error occured (then see the error_log of the web-server)
or a message "The password has been changed".

Good luck.
Baumgrtner
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