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

posix_getpwnamDevolver información sobre un usuario mediante su nombre de usuario


posix_getpwnam(string $username): array

Devuelve un array de información sobre el usuario dado.



Un nombre de usuario alfanumérico.

Valores devueltos

En caso de éxito se devuelve un array con los siguientes elementos, si no se devuelve false:

El array de información de usuario
Elemento Descripción
name El elemento name contiene el nombre del grupo. Es una abreviatura, normalmente menos de 16 caracteres "soportan" el groupo, no el nombre real completo. Debería se el mismo que el parámetro username usado al llamar a la función, y por lo tanto redundante.
passwd El elemento passwd contiene la contraseña del grupo en un formato encriptado. A menudo, por ejemplo bajo un sistema que emplea contraseñas "shadow", se devuelve un asterisco en su lugar.
uid El ID del usuario en forma numérica.
gid El ID de grupo del usuario. Use la función posix_getgrgid() para resolver el nombre de grupo y una lista de sus miembros.
gecos GECOS es un término obosleto que se refiere al campo de información "finger" de un sistema de procesamiento por lotes Honeywell. El campo, sin embargo, todavía existe, y su contenido ha sido formalizado por POSIX. El campo contiene una lista separada por comas que contiene el nombre completo del usuario, teléfono de oficina, número de oficina, y el número de teléfono de casa. En la mayoría de los sistemas solo está disponible el nombre de usuario completo.
dir Este elemento contiene la ruta absoluta al directorio "home" del usuario.
shell El elemento shell contiene la ruta absoluta al ejecutable del executable del shell predeterminado de usuario.


Ejemplo #1 Ejemplo de uso de posix_getpwnam()


= posix_getpwnam("tom");


El resultado del ejemplo sería algo similar a:

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

Ver también

  • posix_getpwuid() - Devolver información sobre un usuario mediante su id de usuario
  • POSIX man page GETPWNAM(3)

add a note

User Contributed Notes 9 notes

darryl at pointclark dot net
22 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;

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

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

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...
perreal at lyon dot cemagref dot fr
22 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(...).
bau at kg-fds dot de
18 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
corychristison at lavacube dot net
19 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.
marcus at nospamsynchromedia dot co dot uk
21 years ago
Given a non-existent username, this function returns a boolean FALSE.
vision_1967 at hotmail dot com
22 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.

sezery at damla dot net
22 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.
bau at kg-fds dot de
18 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
bau at kg-fds dot de
18 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.
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