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moved to: git://git.fedorahosted.org/pam_url.git

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Sascha Spreitzer 2009-06-02 06:36:18 +02:00
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339
apps/pam_url/COPYING
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@ -1,339 +0,0 @@
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
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General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
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<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

41
apps/pam_url/Makefile
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CFLAGS += -fPIC -Wall
ifdef DEBUG
CFLAGS += -O0 -ggdb -DDEBUG=1
else
CFLAGS += -O2
endif
LDFLAGS += -shared -lpam -lcurl
arch := $(shell uname -m)
obj := pam_url.so
objc := ${obj:%.so=%.c}
objo := ${obj:%.so=%.o}
ifeq (${arch},x86_64)
pamlib := lib64/security
CFLAGS += -m64
else
pamlib := lib/security
endif
all: ${obj}
debug:
${MAKE} DEBUG=1 all
${obj}: ${objo}
${CC} ${LDFLAGS} -o ${obj} ${objo}
clean:
rm -f ${obj} ${objo}
install:
install -D -m 755 ${obj} ${DESTDIR}/${pamlib}/${obj}
uninstall:
rm -f ${DESTDIR}/${pamlib}/${obj}

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apps/pam_url/examples/auth.php
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<?
// we need at least 4 POST data elements.
// 1. Authentication mode -> PAM_AUTH, PAM_SESS, PAM_ACCT, PAM_PASS
// 2. PSK, Pre Shared Key
// 3. USER
// 4. PASS
// DO SOURCE IP REGION CHECKS HERE, OTHERWISE BRUTEFORCE attacks might occur!!
$PSK = "hase";
if( isset($_POST["user"]) && isset($_POST["pass"]) && isset($_POST["mode"]) )
{
$ret=0;
switch($_POST["mode"])
{
case "PAM_SM_AUTH";
// Perform authing here
break;
case "PAM_SM_ACCOUNT";
// Perform account aging here
break;
case "PAM_SM_SESSION";
// Perform session management here
break;
case "PAM_SM_PASSWORD";
// Perform password changes here
break;
}
if( 0 == $ret )
{
header("HTTP/1.1 200 OK");
echo $PSK;
}
else
{
header("HTTP/1.1 400 Bad Request");
echo "ACCESS DENIED";
}
}
else
{
header("HTTP/1.1 403 Forbidden");
echo "ACCESS DENIED";
}
?>

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apps/pam_url/pam_url.c
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/*
* pam_url - authenticate against webservers
*
* This software is opensource software licensed under the GNU Public License version 2.
* The author of this software is Sascha Thomas Spreitzer <sspreitzer (at) fedoraproject.org>.
* Please take a look in the COPYING, INSTALL and README files.
*
* USE THIS SOFTWARE WITH ABSOLUTELY NO GUARANTEE AND WARRANTY
*
*
* /etc/pam.d/sshd or /etc/pam.d/system-auth:
*
* [...]
* auth sufficient pam_url.so https://www.example.org/ secret user passwd &do=login
* auth sufficient pam_url.so URL PSK USER PASSWD EXTRA
* [...]
* This module takes 4 arguments:
* - URL = HTTPS URL
* - PSK = Pre Shared Key
* - USER = The name of the user variable
* - PASSWD = The name of the password variable
* - EXTRA = additional url encoded data
*
* auth sufficient pam_url.so https://www.example.org/ secret user passwd &do=auth
* This line forms the following url encoded POST data:
* user=<username>&passwd=<pass>&mode=<PAM_AUTH|PAM_ACCT|PAM_SESS|PAM_PASS>&PSK=secret&do=auth
* It should return either 200 OK with PSK in the body or 403 Forbidden if unsuccessful.
*/
#ifndef NAME
#define NAME "pam_url"
#endif
#ifndef VERS
#define VERS "0.0"
#endif
#ifndef USER_AGENT
#define USER_AGENT NAME "/" VERS
#endif
#define PAM_SM_AUTH 1
#define PAM_SM_ACCOUNT 2
#define PAM_SM_SESSION 3
#define PAM_SM_PASSWORD 4
#include <security/pam_modules.h>
#include <security/pam_ext.h>
#ifndef _SECURITY_PAM_MODULES_H
#error PAM headers not found on this system. Giving up.
#endif
#include <curl/curl.h>
#ifndef __CURL_CURL_H
#error libcurl headers not found on this system. Giving up.
#endif
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#ifndef DEF_URL
#define DEF_URL "https://www.example.org/"
#endif
#ifndef DEF_PSK
#define DEF_PSK "presharedsecret"
#endif
#ifndef DEF_USER
#define DEF_USER "user"
#endif
#ifndef DEF_PASSWD
#define DEF_PASSWD "passwd"
#endif
#ifndef DEF_EXTRA
#define DEF_EXTRA "&do=pam_url"
#endif
typedef struct pam_url_opts_ {
char* url;
char* PSK;
char* userfield;
char* passwdfield;
char* extrafield;
char* mode;
const void* user;
const void* passwd;
} pam_url_opts;
char* recvbuf = NULL;
size_t recvbuf_size = 0;
void notice(pam_handle_t* pamh, const char *msg)
{
pam_syslog(pamh, LOG_NOTICE, "%s", msg);
}
void debug(pam_handle_t* pamh, const char *msg)
{
#ifdef DEBUG
pam_syslog(pamh, LOG_ERR, "%s", msg);
#endif
}
int get_password(pam_handle_t* pamh, pam_url_opts* opts)
{
char* p = NULL;
pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &p, "%s", "Password: ");
if( NULL != p )
{
opts->passwd = p;
return PAM_SUCCESS;
}
else
{
return PAM_AUTH_ERR;
}
}
int parse_opts(pam_url_opts* opts, int argc, const char** argv, int mode)
{
opts->url = calloc(1, strlen(DEF_URL) + 1);
strcpy(opts->url, DEF_URL);
opts->PSK = calloc(1, strlen(DEF_PSK) + 1);
strcpy(opts->PSK, DEF_PSK);
opts->userfield = calloc(1, strlen(DEF_USER) + 1);
strcpy(opts->userfield, DEF_USER);
opts->passwdfield = calloc(1, strlen(DEF_PASSWD) + 1);
strcpy(opts->passwdfield, DEF_PASSWD);
opts->extrafield = calloc(1, strlen(DEF_EXTRA) + 1);
strcpy(opts->extrafield, DEF_EXTRA);
if( 0 == argc )
{
return PAM_SUCCESS;
}
if( argc >= 1 )
{
opts->url = calloc(1, strlen(argv[0]) + 1);
strcpy(opts->url, argv[0]);
}
if( argc >= 2 )
{
opts->PSK = calloc(1, strlen(argv[1]) +1);
strcpy(opts->PSK, argv[1]);
}
if( argc >= 3 )
{
opts->userfield = calloc(1, strlen(argv[2]) + 1);
strcpy(opts->userfield, argv[2]);
}
if( argc >= 4 )
{
opts->passwdfield = calloc(1, strlen(argv[3]) + 1);
strcpy(opts->passwdfield, argv[3]);
}
if( argc >= 5 )
{
opts->extrafield = calloc(1, strlen(argv[4]) + 1);
strcpy(opts->extrafield, argv[4]);
}
switch(mode)
{
case PAM_SM_ACCOUNT:
opts->mode = calloc(1, strlen("PAM_SM_ACCOUNT") + 1);
strcpy(opts->mode, "PAM_SM_ACCOUNT");
break;
case PAM_SM_SESSION:
opts->mode = calloc(1, strlen("PAM_SM_SESSION") + 1);
strcpy(opts->mode, "PAM_SM_SESSION");
break;
case PAM_SM_PASSWORD:
opts->mode = calloc(1, strlen("PAM_SM_PASSWORD") + 1);
strcpy(opts->mode, "PAM_SM_PASSWORD");
break;
default: // PAM_SM_AUTH
opts->mode = calloc(1, strlen("PAM_SM_AUTH") + 1);
strcpy(opts->mode,"PAM_SM_AUTH");
}
return PAM_SUCCESS;
}
size_t curl_wf(void *ptr, size_t size, size_t nmemb, void *stream)
{
size_t oldsize=0;
if( 0 == size * nmemb )
return 0;
if( NULL == recvbuf )
{
if( NULL == ( recvbuf = calloc(nmemb, size) ) )
{
return 0;
}
}
if( NULL == ( recvbuf = realloc(recvbuf, recvbuf_size + (nmemb * size)) ) )
{
return 0;
}
else
{
oldsize=recvbuf_size;
recvbuf_size += nmemb * size;
memcpy(recvbuf + oldsize, ptr, size * nmemb);
return(size*nmemb);
}
}
int fetch_url(pam_url_opts opts)
{
CURL* eh = NULL;
char* post = NULL;
if( NULL == opts.user )
opts.user = calloc(1,1);
if( NULL == opts.passwd )
opts.passwd = calloc(1,1);
post = calloc(1,strlen(opts.userfield) +
strlen("=") +
strlen(opts.user) +
strlen("&") +
strlen(opts.passwdfield) +
strlen("=") +
strlen(opts.passwd) +
strlen("&mode=") +
strlen(opts.mode) +
strlen(opts.extrafield) +
strlen("\0") );
sprintf(post, "%s=%s&%s=%s&mode=%s%s", opts.userfield,
(char*)opts.user,
opts.passwdfield,
(char*)opts.passwd,
opts.mode,
opts.extrafield);
if( 0 != curl_global_init(CURL_GLOBAL_ALL) )
return PAM_AUTH_ERR;
if( NULL == (eh = curl_easy_init() ) )
return PAM_AUTH_ERR;
#ifdef DEBUG
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_VERBOSE, 1) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
#endif
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_POSTFIELDS, post) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_USERAGENT, USER_AGENT) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, curl_wf) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_URL, opts.url) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_SSL_VERIFYHOST, 2) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_SSL_VERIFYPEER, 1) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_setopt(eh, CURLOPT_FAILONERROR, 1) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
if( CURLE_OK != curl_easy_perform(eh) )
{
curl_easy_cleanup(eh);
return PAM_AUTH_ERR;
}
else
{
curl_easy_cleanup(eh);
return PAM_SUCCESS;
}
}
int check_psk(pam_url_opts opts)
{
int ret=0;
if( NULL == recvbuf )
{
ret++;
return PAM_AUTH_ERR;
}
if( 0 != memcmp(opts.PSK, recvbuf, strlen(opts.PSK)) )
ret++;
if( 0 != ret )
{
return PAM_AUTH_ERR;
}
else
{
return PAM_SUCCESS;
}
}
void cleanup(pam_url_opts opts)
{
if( NULL != recvbuf )
free(recvbuf);
recvbuf_size=0;
}
PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{ // by now, a dummy
return PAM_SUCCESS;
}
PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
pam_url_opts opts;
int ret = 0;
if ( PAM_SUCCESS != pam_get_item(pamh, PAM_USER, &opts.user) )
{
ret++;
debug(pamh, "Could not get user item from pam.");
}
if( PAM_SUCCESS != pam_get_item(pamh, PAM_AUTHTOK, &opts.passwd) )
{
ret++;
debug(pamh, "Could not get password item from pam.");
}
if( NULL == opts.passwd )
{
debug(pamh, "No password. Will ask user for it.");
if( PAM_SUCCESS != get_password(pamh, &opts) )
{
debug(pamh, "Could not get password from user. No TTY?");
return PAM_AUTH_ERR;
}
else
{
pam_set_item(pamh, PAM_AUTHTOK, opts.passwd);
}
}
if( PAM_SUCCESS != parse_opts(&opts, argc, argv, PAM_SM_AUTH) )
{
ret++;
debug(pamh, "Could not parse module options.");
}
if( PAM_SUCCESS != fetch_url(opts) )
{
ret++;
debug(pamh, "Could not fetch URL.");
}
if( PAM_SUCCESS != check_psk(opts) )
{
ret++;
debug(pamh, "Pre Shared Key differs from ours.");
}
if( 0 == ret )
return PAM_SUCCESS;
debug(pamh, "Authentication failed.");
cleanup(opts);
return PAM_AUTH_ERR;
}
PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
pam_url_opts opts;
int ret=0;
if ( PAM_SUCCESS != pam_get_item(pamh, PAM_USER, &opts.user) )
{
ret++;
debug(pamh, "Could not get user item from pam.");
}
if( PAM_SUCCESS != parse_opts(&opts, argc, argv, PAM_SM_ACCOUNT) )
{
ret++;
debug(pamh, "Could not parse module options.");
}
if( PAM_SUCCESS != fetch_url(opts) )
{
ret++;
debug(pamh, "Could not fetch URL.");
}
if( PAM_SUCCESS != check_psk(opts) )
{
ret++;
debug(pamh, "Pre Shared Key differs from ours.");
}
if( 0 == ret )
return PAM_SUCCESS;
debug(pamh, "Account aged out. Failing.");
cleanup(opts);
return PAM_PERM_DENIED;
}
PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
pam_url_opts opts;
int ret=0;
char* addextra = "&PAM_SM_SESSION=open\0";
char* tmp = NULL;
if ( PAM_SUCCESS != pam_get_item(pamh, PAM_USER, &opts.user) )
{
ret++;
debug(pamh, "Could not get user item from pam.");
}
if( PAM_SUCCESS != parse_opts(&opts, argc, argv, PAM_SM_SESSION) )
{
ret++;
debug(pamh, "Could not parse module options.");
}
opts.extrafield = realloc(opts.extrafield, strlen(opts.extrafield) + strlen(addextra) + 1);
tmp = calloc(1, strlen(opts.extrafield) );
sprintf(tmp, "%s", opts.extrafield );
sprintf(opts.extrafield, "%s%s", addextra, tmp);
free(tmp);
if( PAM_SUCCESS != fetch_url(opts) )
{
ret++;
debug(pamh, "Could not fetch URL.");
}
if( PAM_SUCCESS != check_psk(opts) )
{
ret++;
debug(pamh, "Pre Shared Key differs from ours.");
}
if( 0 == ret )
return PAM_SUCCESS;
debug(pamh, "Session not registering. Failing.");
cleanup(opts);
return PAM_SESSION_ERR;
}
PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
pam_url_opts opts;
int ret=0;
char* addextra = "&PAM_SM_SESSION=close\0";
char* tmp = NULL;
if ( PAM_SUCCESS != pam_get_item(pamh, PAM_USER, &opts.user) )
{
ret++;
debug(pamh, "Could not get user item from pam.");
}
if( PAM_SUCCESS != parse_opts(&opts, argc, argv, PAM_SM_SESSION) )
{
ret++;
debug(pamh, "Could not parse module options.");
}
opts.extrafield = realloc(opts.extrafield, strlen(opts.extrafield) + strlen(addextra) + 1);
tmp = calloc(1, strlen(opts.extrafield) );
sprintf(tmp, "%s", opts.extrafield );
sprintf(opts.extrafield, "%s%s", addextra, tmp);
free(tmp);
if( PAM_SUCCESS != fetch_url(opts) )
{
ret++;
debug(pamh, "Could not fetch URL.");
}
if( PAM_SUCCESS != check_psk(opts) )
{
ret++;
debug(pamh, "Pre Shared Key differs from ours.");
}
if( 0 == ret )
return PAM_SUCCESS;
debug(pamh, "Session not releasing. Failing.");
cleanup(opts);
return PAM_SESSION_ERR;
}
PAM_EXTERN int pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
pam_url_opts opts;
int ret=0;
char *newp1 = NULL, *newp2 = NULL;
char *tmp = NULL;
if( PAM_PRELIM_CHECK == flags )
{ // TODO: Connection checks?
return PAM_SUCCESS;
}
if ( PAM_SUCCESS != pam_get_item(pamh, PAM_USER, &opts.user) )
{
ret++;
debug(pamh, "Could not get user item from pam.");
}
if( PAM_SUCCESS != parse_opts(&opts, argc, argv, PAM_SM_PASSWORD) )
{
ret++;
debug(pamh, "Could not parse module options.");
}
pam_get_item(pamh, PAM_OLDAUTHTOK, &opts.passwd);
if( NULL == opts.passwd )
{
pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &opts.passwd, "%s", " CURRENT password: ");
}
pam_get_item(pamh, PAM_AUTHTOK, &newp1);
if( NULL == newp1 )
{
pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &newp1, "%s"," Enter NEW password: ");
pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &newp2, "%s","Retype NEW password: ");
if( 0 != strcmp(newp1,newp2) )
{
ret++;
return PAM_AUTHTOK_ERR;
}
}
opts.extrafield = realloc(opts.extrafield, strlen(opts.extrafield) +
strlen("&newpass=") +
strlen(newp1) + 1);
tmp = calloc(1, strlen(opts.extrafield) );
sprintf(tmp, "%s", opts.extrafield );
sprintf(opts.extrafield, "&newpass=%s%s", newp1, tmp);
free(tmp);
if( PAM_SUCCESS != fetch_url(opts) )
{
ret++;
debug(pamh, "Could not fetch URL.");
}
if( PAM_SUCCESS != check_psk(opts) )
{
ret++;
debug(pamh, "Pre Shared Key differs from ours.");
}
cleanup(opts);
if( 0 == ret )
{
return PAM_SUCCESS;
}
else
{
debug(pamh, "Password change failed.");
return PAM_AUTHTOK_ERR;
}
}
/*
* vim: nu paste
*/

36
apps/pam_url/pam_url.spec
View file

@ -1,36 +0,0 @@
Summary: PAM module to fetch from URL.
Name: pam_url
Version: 0
Release: 1
License: GPLv2
Group: System Environment/Base
Source: %{name}-%{version}.%{release}.tar.bz2
BuildRoot: /var/tmp/%{name}-root
Requires: pam libcurl
BuildRequires: pam-devel libcurl-devel
%description
PAM module to fetch from URL.
%prep
%setup -n %{name}
%build
make DEBUG=1 DESTDIR=%{buildroot} all
%install
make DESTDIR=%{buildroot} install
(cd %{buildroot}
find . -type f -iname '*.so' | sed 's/^\.//g' > /var/tmp/%{name}-files
cd -)
%clean
rm -rf $RPM_BUILD_ROOT
%files -f /var/tmp/%{name}-files
%defattr(-,root,root)
%changelog
* Sun May 03 2009 Sascha Thomas Spreitzer <sspreitzer@fedoraproject.org>
- First shot of rpm spec.