447 lines
10 KiB
C++
447 lines
10 KiB
C++
/* passwd.cc: getpwnam () and friends
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Copyright 1996, 1997, 1998, 2001, 2002 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <errno.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "fhandler.h"
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#include "path.h"
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#include "dtable.h"
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#include "pinfo.h"
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#include "cygheap.h"
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#include <sys/termios.h>
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#include "pwdgrp.h"
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/* Read /etc/passwd only once for better performance. This is done
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on the first call that needs information from it. */
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static struct passwd *passwd_buf; /* passwd contents in memory */
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static int curr_lines;
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static int max_lines;
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static pwdgrp_check passwd_state;
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/* Position in the passwd cache */
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#ifdef _MT_SAFE
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#define pw_pos _reent_winsup ()->_pw_pos
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#else
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static int pw_pos = 0;
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#endif
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/* Remove a : teminated string from the buffer, and increment the pointer */
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static char *
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grab_string (char **p)
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{
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char *src = *p;
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char *res = src;
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while (*src && *src != ':' && *src != '\n')
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src++;
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if (*src == ':')
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{
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*src = 0;
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src++;
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}
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*p = src;
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return res;
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}
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/* same, for ints */
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static int
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grab_int (char **p)
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{
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char *src = *p;
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int val = strtol (src, NULL, 10);
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while (*src && *src != ':' && *src != '\n')
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src++;
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if (*src == ':')
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src++;
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*p = src;
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return val;
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}
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/* Parse /etc/passwd line into passwd structure. */
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void
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parse_pwd (struct passwd &res, char *buf)
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{
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/* Allocate enough room for the passwd struct and all the strings
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in it in one go */
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size_t len = strlen (buf);
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if (buf[--len] == '\r')
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buf[len] = '\0';
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res.pw_name = grab_string (&buf);
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res.pw_passwd = grab_string (&buf);
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res.pw_uid = grab_int (&buf);
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res.pw_gid = grab_int (&buf);
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res.pw_comment = 0;
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res.pw_gecos = grab_string (&buf);
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res.pw_dir = grab_string (&buf);
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res.pw_shell = grab_string (&buf);
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}
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/* Add one line from /etc/passwd into the password cache */
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static void
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add_pwd_line (char *line)
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{
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if (curr_lines >= max_lines)
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{
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max_lines += 10;
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passwd_buf = (struct passwd *) realloc (passwd_buf, max_lines * sizeof (struct passwd));
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}
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parse_pwd (passwd_buf[curr_lines++], line);
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}
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class passwd_lock
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{
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bool armed;
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static NO_COPY pthread_mutex_t mutex;
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public:
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passwd_lock (bool doit)
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{
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if (doit)
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pthread_mutex_lock (&mutex);
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armed = doit;
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}
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~passwd_lock ()
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{
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if (armed)
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pthread_mutex_unlock (&mutex);
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}
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};
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pthread_mutex_t NO_COPY passwd_lock::mutex = (pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER;
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/* Read in /etc/passwd and save contents in the password cache.
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This sets passwd_state to loaded or emulated so functions in this file can
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tell that /etc/passwd has been read in or will be emulated. */
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void
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read_etc_passwd ()
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{
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static pwdgrp_read pr;
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/* A mutex is ok for speed here - pthreads will use critical sections not
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* mutexes for non-shared mutexes in the future. Also, this function will
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* at most be called once from each thread, after that the passwd_state
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* test will succeed */
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passwd_lock here (cygwin_finished_initializing);
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/* if we got blocked by the mutex, then etc_passwd may have been processed */
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if (passwd_state != uninitialized)
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return;
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if (passwd_state != initializing)
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{
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passwd_state = initializing;
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if (pr.open ("/etc/passwd"))
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{
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char *line;
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while ((line = pr.gets ()) != NULL)
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if (strlen (line))
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add_pwd_line (line);
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passwd_state.set_last_modified (pr.get_fhandle(), pr.get_fname ());
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passwd_state = loaded;
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pr.close ();
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debug_printf ("Read /etc/passwd, %d lines", curr_lines);
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}
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else
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{
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static char linebuf[1024];
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if (wincap.has_security ())
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{
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HANDLE ptok;
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cygsid tu, tg;
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DWORD siz;
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if (OpenProcessToken (hMainProc, TOKEN_QUERY, &ptok))
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{
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if (GetTokenInformation (ptok, TokenUser, &tu, sizeof tu,
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&siz)
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&& GetTokenInformation (ptok, TokenPrimaryGroup, &tg,
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sizeof tg, &siz))
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{
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char strbuf[100];
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snprintf (linebuf, sizeof (linebuf),
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"%s::%lu:%lu:%s:%s:/bin/sh",
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cygheap->user.name (),
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*GetSidSubAuthority(tu,
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*GetSidSubAuthorityCount(tu) - 1),
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*GetSidSubAuthority(tg,
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*GetSidSubAuthorityCount(tg) - 1),
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tu.string (strbuf), getenv ("HOME") ?: "/");
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debug_printf ("Emulating /etc/passwd: %s", linebuf);
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add_pwd_line (linebuf);
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passwd_state = emulated;
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}
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CloseHandle (ptok);
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}
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}
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if (passwd_state != emulated)
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{
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snprintf (linebuf, sizeof (linebuf), "%s::%u:%u::%s:/bin/sh",
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cygheap->user.name (), (unsigned) DEFAULT_UID,
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(unsigned) DEFAULT_GID, getenv ("HOME") ?: "/");
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debug_printf ("Emulating /etc/passwd: %s", linebuf);
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add_pwd_line (linebuf);
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passwd_state = emulated;
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}
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}
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}
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return;
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}
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/* Cygwin internal */
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/* If this ever becomes non-reentrant, update all the getpw*_r functions */
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static struct passwd *
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search_for (__uid32_t uid, const char *name)
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{
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struct passwd *res = 0;
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struct passwd *default_pw = 0;
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for (int i = 0; i < curr_lines; i++)
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{
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res = passwd_buf + i;
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if (res->pw_uid == DEFAULT_UID)
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default_pw = res;
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/* on Windows NT user names are case-insensitive */
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if (name)
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{
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if (strcasematch (name, res->pw_name))
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return res;
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}
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else if (uid == (__uid32_t) res->pw_uid)
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return res;
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}
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/* Return default passwd entry if passwd is emulated or it's a
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request for the current user. */
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if (passwd_state != loaded
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|| (!name && uid == myself->uid)
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|| (name && strcasematch (name, cygheap->user.name ())))
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return default_pw;
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return NULL;
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}
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extern "C" struct passwd *
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getpwuid32 (__uid32_t uid)
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{
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if (passwd_state <= initializing)
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read_etc_passwd ();
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pthread_testcancel();
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return search_for (uid, 0);
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}
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extern "C" struct passwd *
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getpwuid (__uid16_t uid)
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{
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return getpwuid32 (uid16touid32 (uid));
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}
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extern "C" int
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getpwuid_r32 (__uid32_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
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{
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*result = NULL;
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if (!pwd || !buffer)
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return ERANGE;
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if (passwd_state <= initializing)
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read_etc_passwd ();
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pthread_testcancel();
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struct passwd *temppw = search_for (uid, 0);
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if (!temppw)
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return 0;
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/* check needed buffer size. */
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size_t needsize = strlen (temppw->pw_name) + strlen (temppw->pw_dir) +
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strlen (temppw->pw_shell) + strlen (temppw->pw_gecos) +
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strlen (temppw->pw_passwd) + 5;
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if (needsize > bufsize)
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return ERANGE;
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/* make a copy of temppw */
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*result = pwd;
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pwd->pw_uid = temppw->pw_uid;
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pwd->pw_gid = temppw->pw_gid;
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pwd->pw_name = buffer;
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pwd->pw_dir = pwd->pw_name + strlen (temppw->pw_name) + 1;
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pwd->pw_shell = pwd->pw_dir + strlen (temppw->pw_dir) + 1;
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pwd->pw_gecos = pwd->pw_shell + strlen (temppw->pw_shell) + 1;
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pwd->pw_passwd = pwd->pw_gecos + strlen (temppw->pw_gecos) + 1;
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strcpy (pwd->pw_name, temppw->pw_name);
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strcpy (pwd->pw_dir, temppw->pw_dir);
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strcpy (pwd->pw_shell, temppw->pw_shell);
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strcpy (pwd->pw_gecos, temppw->pw_gecos);
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strcpy (pwd->pw_passwd, temppw->pw_passwd);
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return 0;
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}
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extern "C" int
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getpwuid_r (__uid16_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
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{
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return getpwuid_r32 (uid16touid32 (uid), pwd, buffer, bufsize, result);
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}
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extern "C" struct passwd *
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getpwnam (const char *name)
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{
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if (passwd_state <= initializing)
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read_etc_passwd ();
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pthread_testcancel();
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return search_for (0, name);
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}
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/* the max size buffer we can expect to
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* use is returned via sysconf with _SC_GETPW_R_SIZE_MAX.
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* This may need updating! - Rob Collins April 2001.
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*/
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extern "C" int
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getpwnam_r (const char *nam, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
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{
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*result = NULL;
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if (!pwd || !buffer || !nam)
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return ERANGE;
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if (passwd_state <= initializing)
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read_etc_passwd ();
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pthread_testcancel();
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struct passwd *temppw = search_for (0, nam);
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if (!temppw)
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return 0;
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/* check needed buffer size. */
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size_t needsize = strlen (temppw->pw_name) + strlen (temppw->pw_dir) +
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strlen (temppw->pw_shell) + strlen (temppw->pw_gecos) +
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strlen (temppw->pw_passwd) + 5;
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if (needsize > bufsize)
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return ERANGE;
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/* make a copy of temppw */
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*result = pwd;
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pwd->pw_uid = temppw->pw_uid;
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pwd->pw_gid = temppw->pw_gid;
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pwd->pw_name = buffer;
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pwd->pw_dir = pwd->pw_name + strlen (temppw->pw_name) + 1;
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pwd->pw_shell = pwd->pw_dir + strlen (temppw->pw_dir) + 1;
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pwd->pw_gecos = pwd->pw_shell + strlen (temppw->pw_shell) + 1;
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pwd->pw_passwd = pwd->pw_gecos + strlen (temppw->pw_gecos) + 1;
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strcpy (pwd->pw_name, temppw->pw_name);
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strcpy (pwd->pw_dir, temppw->pw_dir);
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strcpy (pwd->pw_shell, temppw->pw_shell);
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strcpy (pwd->pw_gecos, temppw->pw_gecos);
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strcpy (pwd->pw_passwd, temppw->pw_passwd);
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return 0;
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}
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extern "C" struct passwd *
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getpwent (void)
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{
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if (passwd_state <= initializing)
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read_etc_passwd ();
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if (pw_pos < curr_lines)
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return passwd_buf + pw_pos++;
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return NULL;
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}
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extern "C" struct passwd *
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getpwduid (__uid16_t)
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{
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return NULL;
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}
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extern "C" void
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setpwent (void)
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{
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pw_pos = 0;
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}
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extern "C" void
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endpwent (void)
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{
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pw_pos = 0;
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}
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extern "C" int
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setpassent ()
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{
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return 0;
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}
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/* Internal function. ONLY USE THIS INTERNALLY, NEVER `getpwent'!!! */
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struct passwd *
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internal_getpwent (int pos)
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{
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if (passwd_state <= initializing)
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read_etc_passwd ();
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if (pos < curr_lines)
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return passwd_buf + pos;
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return NULL;
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}
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extern "C" char *
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getpass (const char * prompt)
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{
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#ifdef _MT_SAFE
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char *pass=_reent_winsup ()->_pass;
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#else
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static char pass[_PASSWORD_LEN];
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#endif
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struct termios ti, newti;
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if (passwd_state <= initializing)
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read_etc_passwd ();
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cygheap_fdget fhstdin (0);
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if (fhstdin < 0)
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pass[0] = '\0';
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else
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{
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fhstdin->tcgetattr (&ti);
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newti = ti;
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newti.c_lflag &= ~ECHO;
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fhstdin->tcsetattr (TCSANOW, &newti);
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fputs (prompt, stderr);
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fgets (pass, _PASSWORD_LEN, stdin);
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fprintf (stderr, "\n");
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for (int i=0; pass[i]; i++)
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if (pass[i] == '\r' || pass[i] == '\n')
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pass[i] = '\0';
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fhstdin->tcsetattr (TCSANOW, &ti);
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}
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return pass;
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}
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