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The intention is that pam_yubico should have the same license as
Linux-PAM. The following license statement is taken from Linux-PAM.
A copy of the GPL version 2 follows below.
----------------------------------------------------------------------
Redistribution and use in source and binary forms of Linux-PAM, with
or without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain any existing copyright
notice, and this entire permission notice in its entirety,
including the disclaimer of warranties.
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copyright notices, this list of conditions, and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
3. The name of any author may not be used to endorse or promote
products derived from this software without their specific prior
written permission.
ALTERNATIVELY, this product may be distributed under the terms of the
GNU General Public License, in which case the provisions of the GNU
GPL are required INSTEAD OF the above restrictions. (This clause is
necessary due to a potential conflict between the GNU GPL and the
restrictions contained in a BSD-style copyright.)
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
----------------------------------------------------------------------
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# Copyright 2007, 2008 Simon Josefsson.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, and the entire permission notice in its entirety,
# including the disclaimer of warranties.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior
# written permission.
#
# ALTERNATIVELY, this product may be distributed under the terms of
# the GNU Public License, in which case the provisions of the GPL are
# required INSTEAD OF the above restrictions. (This clause is
# necessary due to a potential bad interaction between the GPL and
# the restrictions contained in a BSD-style copyright.)
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
ACLOCAL_AMFLAGS = -I .
libdir = $(PAMDIR)
lib_LTLIBRARIES = pam_yubico.la
AM_CPPFLAGS = @LIBCURL_CPPFLAGS@
pam_yubico_la_SOURCES = pam_yubico.c
# XXX add -Wl,-x too? PAM documentation suggests it.
pam_yubico_la_LIBADD = @LIBCURL@
pam_yubico_la_LDFLAGS = -module -avoid-version
DEFS = -DDEBUG_PAM @DEFS@
# Manual
EXTRA_DIST = yubico-pam.pdf yubico-pam.html
yubico-pam.pdf yubico-pam.html: README
cp README yubico-pam.txt
a2x yubico-pam.txt
docbook2pdf yubico-pam.xml
rm -f yubico-pam.txt yubico-pam.xml
# Self tests.
AM_LDFLAGS = -no-install
LDADD = ./pam_yubico.la -lpam
check_PROGRAMS = test
TESTS = $(check_PROGRAMS)

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Version 1.5
-----------
Clarify that license is the same as Linux-PAM (GPLv2 or modified BSD).
This is likely the last internal release, source moving to code.google.com.
Version 1.4
-----------
Don't free CURL's user agent string before we're done.
Version 1.3
-----------
Disable echo'ing of password, for FreeRadius.
Version 1.2
-----------
Added PDF/HTML manual, see yubico-pam.pdf and yubico-pam.html.
Fixes to use new web service API.
Add "url" parameter.
Fix "alwaysok" parameter.
Fix crash on empty server responses.
Parse "status" properly.
Better debug info.
Version 1.1
-----------
Fix ws-api usage.
Support "alwaysok".
Version 1.0
-----------
Initial release.
Legal
-----
Copyright (C) 2007, 2008 Simon Josefsson
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.

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Yubico PAM module
=================
The Yubico PAM module provides an easy way to integrate the Yubikey
into your existing user authentication infrastructure. PAM is used by
GNU/Linux, Solaris and Mac OS X for user authentication, and by other
specialized applications such as NCSA MyProxy.
Status and Roadmap
------------------
The module is working for single-user systems.
Several items have been identified that needs to be implemented before
it can reach production quality:
* Verification of server signature
* Generating signature on request
* HTTPS support
* Multi-user mappings from Yubikey to username.
Building from CVS
-----------------
Skip to the next section if you are using an official packaged
version.
Autoconf and automake must be installed. For the documentation,
asciidoc and docbook are also required.
Generate the build system using:
autoreconf --install
Building
--------
You will need to have libcurl (curl.h, libcurl.so) and libpam-dev
(security/pam_appl.h, libpam.so) installed.
The build system uses Autoconf, to set up the build system run:
./configure
Then build the code, run the self-test and install the binaries:
make check install
Configuration
-------------
Install it in your PAM setup by adding a line to an appropriate file
in /etc/pam.d/:
auth sufficient pam_yubico.so id=16 debug
and create a symlink for pam_yubico.so in /lib/security/:
ln -s /usr/local/lib/security/pam_yubico.so /lib/security/
Supported PAM module parameters are:
"id": to indicate your client identity,
"debug": to enable debug output to stdout,
"alwaysok": to enable that all authentication attempts should succeed
(aka presentation mode).
"url": specify URL to use for verification, by default it is
"http://api.yubico.com/wsapi/verify?id=%d&otp=%s"
Be sure to have only two printf tokens in the string
and that %d comes before %s. The %d will be replaced
with the "id" value and %s with the user's OTP.
If you are using "debug" you may find it useful to create a
world-writable log file:
touch /var/run/pam-debug.log
chmod go+w /var/run/pam-debug.log
Feedback
--------
If you want to discuss anything related to the Yubico PAM module,
please contact mailto:simon@yubico.com[Simon Josefsson].
Legal
-----
Copyright (C) 2007, 2008 Simon Josefsson
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.

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# Copyright 2007, 2008 Simon Josefsson.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, and the entire permission notice in its entirety,
# including the disclaimer of warranties.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior
# written permission.
#
# ALTERNATIVELY, this product may be distributed under the terms of
# the GNU Public License, in which case the provisions of the GPL are
# required INSTEAD OF the above restrictions. (This clause is
# necessary due to a potential bad interaction between the GPL and
# the restrictions contained in a BSD-style copyright.)
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
AC_INIT([pam_yubico], [1.5], [simon@yubico.com])
AM_INIT_AUTOMAKE([foreign])
AC_PROG_CC
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL
AC_CHECK_HEADERS([security/pam_appl.h security/pam_modules.h security/_pam_macros.h], [], [AC_MSG_ERROR([[PAM header files not found, install libpam-dev.]])])
LIBCURL_CHECK_CONFIG([yes], [], [], [AC_MSG_ERROR([[Libcurl header files not found, install libcurl-dev.]])])
AC_SUBST(PAMDIR, "\$(exec_prefix)/lib/security")
AC_ARG_WITH(pam-dir,
AC_HELP_STRING([--with-pam-dir=DIR],
[Where to install PAM module [[PREFIX/lib/security]]]),
[case "${withval}" in
/*) PAMDIR="${withval}";;
./*|../*) AC_MSG_ERROR(Bad value for --with-pam-dir);;
*) PAMDIR="\$(exec_prefix)/lib/${withval}";;
esac])
AC_MSG_NOTICE([PAM installation path $PAMDIR])
AC_CONFIG_FILES(Makefile)
AC_OUTPUT

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# LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
# [ACTION-IF-YES], [ACTION-IF-NO])
# ----------------------------------------------------------
# David Shaw <dshaw@jabberwocky.com> May-09-2006
#
# Checks for libcurl. DEFAULT-ACTION is the string yes or no to
# specify whether to default to --with-libcurl or --without-libcurl.
# If not supplied, DEFAULT-ACTION is yes. MINIMUM-VERSION is the
# minimum version of libcurl to accept. Pass the version as a regular
# version number like 7.10.1. If not supplied, any version is
# accepted. ACTION-IF-YES is a list of shell commands to run if
# libcurl was successfully found and passed the various tests.
# ACTION-IF-NO is a list of shell commands that are run otherwise.
# Note that using --without-libcurl does run ACTION-IF-NO.
#
# This macro #defines HAVE_LIBCURL if a working libcurl setup is
# found, and sets @LIBCURL@ and @LIBCURL_CPPFLAGS@ to the necessary
# values. Other useful defines are LIBCURL_FEATURE_xxx where xxx are
# the various features supported by libcurl, and LIBCURL_PROTOCOL_yyy
# where yyy are the various protocols supported by libcurl. Both xxx
# and yyy are capitalized. See the list of AH_TEMPLATEs at the top of
# the macro for the complete list of possible defines. Shell
# variables $libcurl_feature_xxx and $libcurl_protocol_yyy are also
# defined to 'yes' for those features and protocols that were found.
# Note that xxx and yyy keep the same capitalization as in the
# curl-config list (e.g. it's "HTTP" and not "http").
#
# Users may override the detected values by doing something like:
# LIBCURL="-lcurl" LIBCURL_CPPFLAGS="-I/usr/myinclude" ./configure
#
# For the sake of sanity, this macro assumes that any libcurl that is
# found is after version 7.7.2, the first version that included the
# curl-config script. Note that it is very important for people
# packaging binary versions of libcurl to include this script!
# Without curl-config, we can only guess what protocols are available,
# or use curl_version_info to figure it out at runtime.
AC_DEFUN([LIBCURL_CHECK_CONFIG],
[
AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])
AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])
AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])
AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])
AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])
AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])
AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])
AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])
AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])
AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])
AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])
AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])
AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])
AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])
AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])
AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])
AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])
AC_ARG_WITH(libcurl,
AC_HELP_STRING([--with-libcurl=DIR],[look for the curl library in DIR]),
[_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])
if test "$_libcurl_with" != "no" ; then
AC_PROG_AWK
_libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
_libcurl_try_link=yes
if test -d "$_libcurl_with" ; then
LIBCURL_CPPFLAGS="-I$withval/include"
_libcurl_ldflags="-L$withval/lib"
AC_PATH_PROG([_libcurl_config],[curl-config],["$withval/bin"],
["$withval/bin"])
else
AC_PATH_PROG([_libcurl_config],[curl-config])
fi
if test x$_libcurl_config != "x" ; then
AC_CACHE_CHECK([for the version of libcurl],
[libcurl_cv_lib_curl_version],
[libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])
_libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`
_libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`
if test $_libcurl_wanted -gt 0 ; then
AC_CACHE_CHECK([for libcurl >= version $2],
[libcurl_cv_lib_version_ok],
[
if test $_libcurl_version -ge $_libcurl_wanted ; then
libcurl_cv_lib_version_ok=yes
else
libcurl_cv_lib_version_ok=no
fi
])
fi
if test $_libcurl_wanted -eq 0 || test x$libcurl_cv_lib_version_ok = xyes ; then
if test x"$LIBCURL_CPPFLAGS" = "x" ; then
LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`
fi
if test x"$LIBCURL" = "x" ; then
LIBCURL=`$_libcurl_config --libs`
# This is so silly, but Apple actually has a bug in their
# curl-config script. Fixed in Tiger, but there are still
# lots of Panther installs around.
case "${host}" in
powerpc-apple-darwin7*)
LIBCURL=`echo $LIBCURL | sed -e 's|-arch i386||g'`
;;
esac
fi
# All curl-config scripts support --feature
_libcurl_features=`$_libcurl_config --feature`
# Is it modern enough to have --protocols? (7.12.4)
if test $_libcurl_version -ge 461828 ; then
_libcurl_protocols=`$_libcurl_config --protocols`
fi
else
_libcurl_try_link=no
fi
unset _libcurl_wanted
fi
if test $_libcurl_try_link = yes ; then
# we didn't find curl-config, so let's see if the user-supplied
# link line (or failing that, "-lcurl") is enough.
LIBCURL=${LIBCURL-"$_libcurl_ldflags -lcurl"}
AC_CACHE_CHECK([whether libcurl is usable],
[libcurl_cv_lib_curl_usable],
[
_libcurl_save_cppflags=$CPPFLAGS
CPPFLAGS="$LIBCURL_CPPFLAGS $CPPFLAGS"
_libcurl_save_libs=$LIBS
LIBS="$LIBCURL $LIBS"
AC_LINK_IFELSE(AC_LANG_PROGRAM([#include <curl/curl.h>],[
/* Try and use a few common options to force a failure if we are
missing symbols or can't link. */
int x;
curl_easy_setopt(NULL,CURLOPT_URL,NULL);
x=CURL_ERROR_SIZE;
x=CURLOPT_WRITEFUNCTION;
x=CURLOPT_FILE;
x=CURLOPT_ERRORBUFFER;
x=CURLOPT_STDERR;
x=CURLOPT_VERBOSE;
]),libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
CPPFLAGS=$_libcurl_save_cppflags
LIBS=$_libcurl_save_libs
unset _libcurl_save_cppflags
unset _libcurl_save_libs
])
if test $libcurl_cv_lib_curl_usable = yes ; then
# Does curl_free() exist in this version of libcurl?
# If not, fake it with free()
_libcurl_save_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $LIBCURL_CPPFLAGS"
_libcurl_save_libs=$LIBS
LIBS="$LIBS $LIBCURL"
AC_CHECK_FUNC(curl_free,,
AC_DEFINE(curl_free,free,
[Define curl_free() as free() if our version of curl lacks curl_free.]))
CPPFLAGS=$_libcurl_save_cppflags
LIBS=$_libcurl_save_libs
unset _libcurl_save_cppflags
unset _libcurl_save_libs
AC_DEFINE(HAVE_LIBCURL,1,
[Define to 1 if you have a functional curl library.])
AC_SUBST(LIBCURL_CPPFLAGS)
AC_SUBST(LIBCURL)
for _libcurl_feature in $_libcurl_features ; do
AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
done
if test "x$_libcurl_protocols" = "x" ; then
# We don't have --protocols, so just assume that all
# protocols are available
_libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT"
if test x$libcurl_feature_SSL = xyes ; then
_libcurl_protocols="$_libcurl_protocols HTTPS"
# FTPS wasn't standards-compliant until version
# 7.11.0
if test $_libcurl_version -ge 461568; then
_libcurl_protocols="$_libcurl_protocols FTPS"
fi
fi
fi
for _libcurl_protocol in $_libcurl_protocols ; do
AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
done
else
unset LIBCURL
unset LIBCURL_CPPFLAGS
fi
fi
unset _libcurl_try_link
unset _libcurl_version_parse
unset _libcurl_config
unset _libcurl_feature
unset _libcurl_features
unset _libcurl_protocol
unset _libcurl_protocols
unset _libcurl_version
unset _libcurl_ldflags
fi
if test x$_libcurl_with = xno || test x$libcurl_cv_lib_curl_usable != xyes ; then
# This is the IF-NO path
ifelse([$4],,:,[$4])
else
# This is the IF-YES path
ifelse([$3],,:,[$3])
fi
unset _libcurl_with
])dnl

404
pam_yubico.c Normal file
View File

@ -0,0 +1,404 @@
/*
* Copyright 2007, 2008 Simon Josefsson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
/* Libtool defines PIC for shared objects */
#ifndef PIC
#define PAM_STATIC
#endif
/* These #defines must be present according to PAM documentation. */
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#define PAM_SM_SESSION
#define PAM_SM_PASSWORD
#ifdef HAVE_SECURITY_PAM_APPL_H
#include <security/pam_appl.h>
#endif
#ifdef HAVE_SECURITY_PAM_MODULES_H
#include <security/pam_modules.h>
#endif
#if defined(DEBUG_PAM) && defined(HAVE_SECURITY__PAM_MACROS_H)
#define DEBUG
#include <security/_pam_macros.h>
#else
#define D(x) /* nothing */
#endif
#include <curl/curl.h>
#ifndef PAM_EXTERN
#ifdef PAM_STATIC
#define PAM_EXTERN static
#else
#define PAM_EXTERN extern
#endif
#endif
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t
curl_callback (void *ptr, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)data;
if (mem->memory)
mem->memory = realloc (mem->memory, mem->size + realsize + 1);
else
mem->memory = malloc (mem->size + realsize + 1);
if (mem->memory)
{
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
}
return realsize;
}
PAM_EXTERN int
pam_sm_authenticate (pam_handle_t * pamh,
int flags, int argc, const char** argv)
{
int retval, rc;
const char *user = NULL;
const char *password = NULL;
int i;
struct pam_conv *conv;
struct pam_message *pmsg[1], msg[1];
struct pam_response *resp;
int nargs = 1;
int id = -1;
int debug = 0;
int alwaysok = 0;
CURL *curl = NULL;
CURLcode res;
char *url;
const char *url_template = "http://api.yubico.com/wsapi/verify?id=%d&otp=%s";
struct MemoryStruct chunk = { NULL, 0 };
char *status;
char *user_agent = NULL;
for (i = 0; i < argc; i++)
{
if (strncmp (argv[i], "id=", 3) == 0)
sscanf (argv[i], "id=%d", &id);
if (strncmp (argv[i], "url=", 4) == 0)
url_template = argv[i] + 4;
if (strcmp (argv[i], "debug") == 0)
debug = 1;
if (strcmp (argv[i], "alwaysok") == 0)
alwaysok = 1;
}
if (debug)
{
D (("called."));
D (("flags %d argc %d", flags, argc));
for (i = 0; i < argc; i++)
D (("argv[%d]=%s", i, argv[i]));
D (("id=%d", id));
D (("url=%s", url_template));
D (("debug=%d", debug));
D (("alwaysok=%d", alwaysok));
}
retval = pam_get_user (pamh, &user, NULL);
if (retval != PAM_SUCCESS)
{
if (debug)
D (("get user returned error: %s", pam_strerror (pamh, retval)));
goto done;
}
if (debug)
D (("get user returned: %s", user));
retval = pam_get_item (pamh, PAM_AUTHTOK, (const void **) &password);
if (retval != PAM_SUCCESS)
{
if (debug)
D (("get password returned error: %s", pam_strerror (pamh, retval)));
goto done;
}
if (debug)
D (("get password returned: %s", password));
if (password == NULL)
{
retval = pam_get_item (pamh, PAM_CONV, (const void **) &conv);
if (retval != PAM_SUCCESS)
{
if (debug)
D (("get conv returned error: %s", pam_strerror (pamh, retval)));
goto done;
}
pmsg[0] = &msg[0];
asprintf ((char **) &msg[0].msg, "Yubikey for `%s': ", user);
msg[0].msg_style = PAM_PROMPT_ECHO_OFF;
resp = NULL;
retval = conv->conv (nargs, (const struct pam_message **) pmsg,
&resp, conv->appdata_ptr);
free ((char *) msg[0].msg);
if (retval != PAM_SUCCESS)
{
if (debug)
D (("conv returned error: %s", pam_strerror (pamh, retval)));
goto done;
}
if (debug)
D (("conv returned: %s", resp->resp));
password = resp->resp;
retval = pam_set_item(pamh, PAM_AUTHTOK, password);
if (retval != PAM_SUCCESS)
{
if (debug)
D (("set_item returned error: %s", pam_strerror (pamh, retval)));
goto done;
}
}
curl = curl_easy_init ();
if (!curl)
{
if (debug)
D (("curl_easy_init() failed"));
retval = PAM_AUTHINFO_UNAVAIL;
goto done;
}
asprintf (&url, url_template, id, password);
if (!url)
{
retval = PAM_BUF_ERR;
goto done;
}
curl_easy_setopt (curl, CURLOPT_URL, url);
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, curl_callback);
curl_easy_setopt (curl, CURLOPT_WRITEDATA, (void *)&chunk);
asprintf (&user_agent, "%s/%s", PACKAGE, PACKAGE_VERSION);
if (user_agent)
curl_easy_setopt(curl, CURLOPT_USERAGENT, user_agent);
curl_easy_perform (curl);
if (debug)
D (("server response (%d): %.*s", chunk.size, chunk.size, chunk.memory));
if (chunk.size == 0 || chunk.memory == NULL)
{
if (debug)
D (("did not receive anything from server"));
retval = PAM_SERVICE_ERR;
goto done;
}
status = strstr (chunk.memory, "status=");
if (!status)
{
if (debug)
D (("no status in server response"));
retval = PAM_SERVICE_ERR;
goto done;
}
if (strchr (status, '\r'))
*strchr (status, '\r') = '\0';
if (strchr (status, '\n'))
*strchr (status, '\n') = '\0';
if (debug)
D (("server status (%d): %s", strlen (status), status));
if (strcmp (status, "status=OK") != 0)
{
if (debug)
D (("status not ok"));
retval = PAM_SERVICE_ERR;
goto done;
}
retval = PAM_SUCCESS;
done:
if (alwaysok && retval != PAM_SUCCESS)
{
if (debug)
D (("alwaysok needed for %d", retval));
retval = PAM_SUCCESS;
}
if (curl)
curl_easy_cleanup (curl);
if (user_agent)
free (user_agent);
pam_set_data (pamh, "yubico_setcred_return", (void *) retval, NULL);
if (debug)
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
PAM_EXTERN int
pam_sm_setcred (pam_handle_t * pamh, int flags, int argc, const char **argv)
{
int retval;
int auth_retval;
D (("called."));
retval = pam_get_data (pamh, "yubico_setcred_return",
(const void **) &auth_retval);
if (retval != PAM_SUCCESS)
return PAM_CRED_UNAVAIL;
/* XXX save ticket in user's file here
XXX support CRED_EXPIRED */
switch (auth_retval)
{
case PAM_SUCCESS:
retval = PAM_SUCCESS;
break;
case PAM_USER_UNKNOWN:
retval = PAM_USER_UNKNOWN;
break;
case PAM_AUTH_ERR:
default:
retval = PAM_CRED_ERR;
break;
}
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
PAM_EXTERN int
pam_sm_acct_mgmt (pam_handle_t * pamh, int flags, int argc, const char **argv)
{
int retval;
D (("called."));
/* TODO: check if password expired? */
retval = PAM_SUCCESS;
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
PAM_EXTERN int
pam_sm_open_session (pam_handle_t * pamh,
int flags, int argc, const char **argv)
{
int retval;
D (("called."));
/* TODO: afslog()? */
retval = PAM_SUCCESS;
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
PAM_EXTERN int
pam_sm_close_session (pam_handle_t * pamh,
int flags, int argc, const char **argv)
{
int retval;
D (("called."));
/* TODO: destroy tickets? destroy AFS tokens? */
retval = PAM_SUCCESS;
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
PAM_EXTERN int
pam_sm_chauthtok (pam_handle_t * pamh, int flags, int argc, const char **argv)
{
int retval;
D (("called."));
/* TODO: Change password */
retval = PAM_SUCCESS;
D (("done. [%s]", pam_strerror (pamh, retval)));
return retval;
}
#ifdef PAM_STATIC
struct pam_module _pam_yubico_modstruct = {
"pam_yubico",
pam_sm_authenticate,
pam_sm_setcred,
pam_sm_acct_mgmt,
pam_sm_open_session,
pam_sm_close_session,
pam_sm_chauthtok
};
#endif

52
test.c Normal file
View File

@ -0,0 +1,52 @@
/*
* Copyright 2007, 2008 Simon Josefsson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <security/pam_appl.h>
#include <security/pam_misc.h>
int main(int argc, char **argv)
{
pam_handle_t *pamh = NULL;
int rc;
rc = pam_sm_authenticate(pamh, 0, 1, argv);
printf ("rc %d\n", rc);
return 0;
}