diff options
Diffstat (limited to 'modules/pam_ftp')
-rw-r--r-- | modules/pam_ftp/Makefile.am | 33 | ||||
-rw-r--r-- | modules/pam_ftp/Makefile.in | 1146 | ||||
-rw-r--r-- | modules/pam_ftp/README | 52 | ||||
-rw-r--r-- | modules/pam_ftp/README.xml | 41 | ||||
-rw-r--r-- | modules/pam_ftp/pam_ftp.8 | 125 | ||||
-rw-r--r-- | modules/pam_ftp/pam_ftp.8.xml | 183 | ||||
-rw-r--r-- | modules/pam_ftp/pam_ftp.c | 213 | ||||
-rwxr-xr-x | modules/pam_ftp/tst-pam_ftp | 2 |
8 files changed, 1795 insertions, 0 deletions
diff --git a/modules/pam_ftp/Makefile.am b/modules/pam_ftp/Makefile.am new file mode 100644 index 0000000..abfa98a --- /dev/null +++ b/modules/pam_ftp/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_ftp.8 +endif +XMLS = README.xml pam_ftp.8.xml +dist_check_SCRIPTS = tst-pam_ftp +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_ftp.la +pam_ftp_la_LIBADD = $(top_builddir)/libpam/libpam.la + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_ftp/Makefile.in b/modules/pam_ftp/Makefile.in new file mode 100644 index 0000000..b9d1b2b --- /dev/null +++ b/modules/pam_ftp/Makefile.in @@ -0,0 +1,1146 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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If the name is ftp or +anonymous, the user's password is broken up at the @ delimiter into a PAM_RUSER +and a PAM_RHOST part; these pam-items being set accordingly. The username ( +PAM_USER) is set to ftp. In this case the module succeeds. Alternatively, the +module sets the PAM_AUTHTOK item with the entered password and fails. + +This module is not safe and easily spoofable. + +OPTIONS + +debug + + Print debug information. + +ignore + + Pay no attention to the email address of the user (if supplied). + +ftp=XXX,YYY,... + + Instead of ftp or anonymous, provide anonymous login to the comma separated + list of users: XXX,YYY,.... Should the applicant enter one of these + usernames the returned username is set to the first in the list: XXX. + +EXAMPLES + +Add the following line to /etc/pam.d/ftpd to handle ftp style anonymous login: + +# +# ftpd; add ftp-specifics. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp.so +auth required pam_unix.so use_first_pass +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + + +AUTHOR + +pam_ftp was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_ftp/README.xml b/modules/pam_ftp/README.xml new file mode 100644 index 0000000..65de28e --- /dev/null +++ b/modules/pam_ftp/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_ftp.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_ftp-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_ftp/pam_ftp.8 b/modules/pam_ftp/pam_ftp.8 new file mode 100644 index 0000000..a7b97ec --- /dev/null +++ b/modules/pam_ftp/pam_ftp.8 @@ -0,0 +1,125 @@ +'\" t +.\" Title: pam_ftp +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_FTP" "8" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +pam_ftp \- PAM module for anonymous access module +.SH "SYNOPSIS" +.HP \w'\fBpam_ftp\&.so\fR\ 'u +\fBpam_ftp\&.so\fR [debug] [ignore] [users=\fIXXX,YYY,\fR...] +.SH "DESCRIPTION" +.PP +pam_ftp is a PAM module which provides a pluggable anonymous ftp mode of access\&. +.PP +This module intercepts the user\*(Aqs name and password\&. If the name is +\fIftp\fR +or +\fIanonymous\fR, the user\*(Aqs password is broken up at the +\fI@\fR +delimiter into a +\fIPAM_RUSER\fR +and a +\fIPAM_RHOST\fR +part; these pam\-items being set accordingly\&. The username (\fIPAM_USER\fR) is set to +\fIftp\fR\&. In this case the module succeeds\&. Alternatively, the module sets the +\fIPAM_AUTHTOK\fR +item with the entered password and fails\&. +.PP +This module is not safe and easily spoofable\&. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\&. +.RE +.PP +\fBignore\fR +.RS 4 +Pay no attention to the email address of the user (if supplied)\&. +.RE +.PP +\fBftp=\fR\fB\fIXXX,YYY,\&.\&.\&.\fR\fR +.RS 4 +Instead of +\fIftp\fR +or +\fIanonymous\fR, provide anonymous login to the comma separated list of users: +\fB\fIXXX,YYY,\&.\&.\&.\fR\fR\&. Should the applicant enter one of these usernames the returned username is set to the first in the list: +\fIXXX\fR\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +Only the +\fBauth\fR +module type is provided\&. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The authentication was successful\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\&. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +/etc/pam\&.d/ftpd +to handle ftp style anonymous login: +.sp +.if n \{\ +.RS 4 +.\} +.nf +# +# ftpd; add ftp\-specifics\&. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp\&.so +auth required pam_unix\&.so use_first_pass +auth required pam_listfile\&.so \e + onerr=succeed item=user sense=deny file=/etc/ftpusers + +.fi +.if n \{\ +.RE +.\} +.sp +.SH "SEE ALSO" +.PP +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_ftp was written by Andrew G\&. Morgan <morgan@kernel\&.org>\&. diff --git a/modules/pam_ftp/pam_ftp.8.xml b/modules/pam_ftp/pam_ftp.8.xml new file mode 100644 index 0000000..6f11f57 --- /dev/null +++ b/modules/pam_ftp/pam_ftp.8.xml @@ -0,0 +1,183 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_ftp"> + + <refmeta> + <refentrytitle>pam_ftp</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_ftp-name"> + <refname>pam_ftp</refname> + <refpurpose>PAM module for anonymous access module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_ftp-cmdsynopsis"> + <command>pam_ftp.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + ignore + </arg> + <arg choice="opt" rep='repeat'> + users=<replaceable>XXX,YYY,</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_ftp-description"> + + <title>DESCRIPTION</title> + + <para> + pam_ftp is a PAM module which provides a pluggable + anonymous ftp mode of access. + </para> + <para> + This module intercepts the user's name and password. If the name is + <emphasis>ftp</emphasis> or <emphasis>anonymous</emphasis>, the + user's password is broken up at the <emphasis>@</emphasis> delimiter + into a <emphasis>PAM_RUSER</emphasis> and a + <emphasis>PAM_RHOST</emphasis> part; these pam-items being set + accordingly. The username (<emphasis>PAM_USER</emphasis>) is set + to <emphasis>ftp</emphasis>. In this case the module succeeds. + Alternatively, the module sets the <emphasis>PAM_AUTHTOK</emphasis> + item with the entered password and fails. + </para> + <para> + This module is not safe and easily spoofable. + </para> + </refsect1> + + <refsect1 id="pam_ftp-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ignore</option> + </term> + <listitem> + <para> + Pay no attention to the email address of the user + (if supplied). + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ftp=<replaceable>XXX,YYY,...</replaceable></option> + </term> + <listitem> + <para> + Instead of <emphasis>ftp</emphasis> or + <emphasis>anonymous</emphasis>, provide anonymous login + to the comma separated list of users: + <option><replaceable>XXX,YYY,...</replaceable></option>. + Should the applicant enter + one of these usernames the returned username is set to + the first in the list: <emphasis>XXX</emphasis>. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_ftp-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + Only the <option>auth</option> module type is provided. + </para> + </refsect1> + + <refsect1 id='pam_ftp-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The authentication was successful. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_ftp-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/ftpd</filename> to + handle ftp style anonymous login: + <programlisting> +# +# ftpd; add ftp-specifics. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp.so +auth required pam_unix.so use_first_pass +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_ftp-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_ftp-author'> + <title>AUTHOR</title> + <para> + pam_ftp was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_ftp/pam_ftp.c b/modules/pam_ftp/pam_ftp.c new file mode 100644 index 0000000..b2c32b7 --- /dev/null +++ b/modules/pam_ftp/pam_ftp.c @@ -0,0 +1,213 @@ +/* + * pam_ftp module + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + */ + +#define PLEASE_ENTER_PASSWORD "Password required for %s." +#define GUEST_LOGIN_PROMPT "Guest login ok, " \ +"send your complete e-mail address as password." + +/* the following is a password that "can't be correct" */ +#define BLOCK_PASSWORD "\177BAD PASSWPRD\177" + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <string.h> + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> +#include "pam_inline.h" + +/* argument parsing */ + +#define PAM_DEBUG_ARG 01 +#define PAM_IGNORE_EMAIL 02 +#define PAM_NO_ANON 04 + +static int +_pam_parse(pam_handle_t *pamh, int argc, const char **argv, const char **users) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + const char *str; + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strcmp(*argv,"ignore")) + ctrl |= PAM_IGNORE_EMAIL; + else if ((str = pam_str_skip_prefix(*argv, "users=")) != NULL) + *users = str; + else + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + + return ctrl; +} + +/* + * check if name is in list or default list. place users name in *_user + * return 1 if listed 0 if not. + */ + +static int lookup(const char *name, const char *list, char **_user) +{ + int anon = 0; + + if (list && *list) { + const char *l; + char *list_copy, *x; + char *sptr = NULL; + + list_copy = strdup(list); + x = list_copy; + while (list_copy && (l = strtok_r(x, ",", &sptr))) { + x = NULL; + if (!strcmp(name, l)) { + *_user = list_copy; + anon = 1; + break; + } + } + if (*_user != list_copy) { + free(list_copy); + } + } else { +#define MAX_L 2 + static const char *l[MAX_L] = { "ftp", "anonymous" }; + int i; + + for (i=0; i<MAX_L; ++i) { + if (!strcmp(l[i], name)) { + *_user = strdup(l[0]); + anon = 1; + break; + } + } + } + + return anon; +} + +/* --- authentication management functions (only) --- */ + +int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval, anon=0, ctrl; + const char *user; + char *anon_user = NULL; + const char *users = NULL; + + /* + * this module checks if the user name is ftp or anonymous. If + * this is the case, it can set the PAM_RUSER to the entered email + * address and SUCCEEDS, otherwise it FAILS. + */ + + ctrl = _pam_parse(pamh, argc, argv, &users); + + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name: %s", + pam_strerror(pamh, retval)); + return PAM_USER_UNKNOWN; + } + + if (!(ctrl & PAM_NO_ANON)) { + anon = lookup(user, users, &anon_user); + } + + if (anon) { + retval = pam_set_item(pamh, PAM_USER, (const void *)anon_user); + if (retval != PAM_SUCCESS || anon_user == NULL) { + pam_syslog(pamh, LOG_ERR, "user resetting failed"); + return PAM_USER_UNKNOWN; + } + free(anon_user); + } + + /* + * OK. we require an email address for user or the user's password. + * - build conversation and get their input. + */ + + { + char *resp = NULL; + const char *token; + + if (!anon) + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + PLEASE_ENTER_PASSWORD, user); + else + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + GUEST_LOGIN_PROMPT); + + if (retval != PAM_SUCCESS) { + _pam_overwrite (resp); + _pam_drop (resp); + return ((retval == PAM_CONV_AGAIN) + ? PAM_INCOMPLETE:PAM_AUTHINFO_UNAVAIL); + } + + if (anon) { + /* XXX: Some effort should be made to verify this email address! */ + + if (!(ctrl & PAM_IGNORE_EMAIL)) { + char *sptr = NULL; + token = strtok_r(resp, "@", &sptr); + retval = pam_set_item(pamh, PAM_RUSER, token); + + if ((token) && (retval == PAM_SUCCESS)) { + token = strtok_r(NULL, "@", &sptr); + retval = pam_set_item(pamh, PAM_RHOST, token); + } + } + + /* we are happy to grant anonymous access to the user */ + retval = PAM_SUCCESS; + + } else { + /* + * we have a password so set AUTHTOK + */ + + pam_set_item(pamh, PAM_AUTHTOK, resp); + + /* + * this module failed, but the next one might succeed with + * this password. + */ + + retval = PAM_AUTH_ERR; + } + + /* clean up */ + _pam_overwrite(resp); + _pam_drop(resp); + + /* success or failure */ + + return retval; + } +} + +int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +/* end of module definition */ diff --git a/modules/pam_ftp/tst-pam_ftp b/modules/pam_ftp/tst-pam_ftp new file mode 100755 index 0000000..1a4f67c --- /dev/null +++ b/modules/pam_ftp/tst-pam_ftp @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_ftp.so |