diff options
Diffstat (limited to '')
| -rw-r--r-- | modules/pam_timestamp/Makefile.am | 50 | ||||
| -rw-r--r-- | modules/pam_timestamp/Makefile.in | 1271 | ||||
| -rw-r--r-- | modules/pam_timestamp/README | 53 | ||||
| -rw-r--r-- | modules/pam_timestamp/README.xml | 46 | ||||
| -rw-r--r-- | modules/pam_timestamp/hmacfile.c | 159 | ||||
| -rw-r--r-- | modules/pam_timestamp/hmacsha1.c | 294 | ||||
| -rw-r--r-- | modules/pam_timestamp/hmacsha1.h | 15 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp.8 | 130 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp.8.xml | 203 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp.c | 836 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp_check.8 | 133 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp_check.8.xml | 207 | ||||
| -rw-r--r-- | modules/pam_timestamp/pam_timestamp_check.c | 42 | ||||
| -rw-r--r-- | modules/pam_timestamp/sha1.c | 254 | ||||
| -rw-r--r-- | modules/pam_timestamp/sha1.h | 60 | ||||
| -rwxr-xr-x | modules/pam_timestamp/tst-pam_timestamp | 2 |
16 files changed, 3755 insertions, 0 deletions
diff --git a/modules/pam_timestamp/Makefile.am b/modules/pam_timestamp/Makefile.am new file mode 100644 index 0000000..5588225 --- /dev/null +++ b/modules/pam_timestamp/Makefile.am @@ -0,0 +1,50 @@ +# +# Copyright (c) 2005, 2009 Thorsten Kukuk <kukuk@suse.de> +# Copyright (c) 2005, 2008 Red Hat, Inc. +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +XMLS = README.xml pam_timestamp.8.xml pam_timestamp_check.8.xml +man_MANS = pam_timestamp.8 pam_timestamp_check.8 +dist_TESTS = tst-pam_timestamp +nodist_TESTS = hmacfile +TESTS = $(dist_TESTS) $(nodist_TESTS) + +EXTRA_DIST = $(man_MANS) $(XMLS) $(dist_TESTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +noinst_HEADERS = hmacsha1.h sha1.h + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include + +pam_timestamp_la_LDFLAGS = -no-undefined -avoid-version -module $(AM_LDFLAGS) +pam_timestamp_la_LIBADD = $(top_builddir)/libpam/libpam.la +if HAVE_VERSIONING + pam_timestamp_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_timestamp.la +sbin_PROGRAMS = pam_timestamp_check + +pam_timestamp_la_SOURCES = pam_timestamp.c hmacsha1.c sha1.c +pam_timestamp_la_CFLAGS = $(AM_CFLAGS) + +pam_timestamp_check_SOURCES = pam_timestamp_check.c +pam_timestamp_check_CFLAGS = $(AM_CFLAGS) @PIE_CFLAGS@ +pam_timestamp_check_LDADD = $(top_builddir)/libpam/libpam.la +pam_timestamp_check_LDFLAGS = @PIE_LDFLAGS@ + +hmacfile_SOURCES = hmacfile.c hmacsha1.c sha1.c +hmacfile_LDADD = $(top_builddir)/libpam/libpam.la + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_timestamp.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + +noinst_PROGRAMS = hmacfile diff --git a/modules/pam_timestamp/Makefile.in b/modules/pam_timestamp/Makefile.in new file mode 100644 index 0000000..efc3969 --- /dev/null +++ b/modules/pam_timestamp/Makefile.in @@ -0,0 +1,1271 @@ +# Makefile.in generated by automake 1.13.4 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2013 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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When an application +attempts to authenticate the user, a pam_timestamp will treat a sufficiently +recent timestamp file as grounds for succeeding. + +OPTIONS + +timestampdir=directory + + Specify an alternate directory where pam_timestamp creates timestamp files. + +timestamp_timeout=number + + How long should pam_timestamp treat timestamp as valid after their last + modification date (in seconds). Default is 300 seconds. + +verbose + + Attempt to inform the user when access is granted. + +debug + + Turns on debugging messages sent to syslog(3). + +NOTES + +Users can get confused when they are not always asked for passwords when +running a given program. Some users reflexively begin typing information before +noticing that it is not being asked for. + +EXAMPLES + +auth sufficient pam_timestamp.so verbose +auth required pam_unix.so + +session required pam_unix.so +session optional pam_timestamp.so + + +AUTHOR + +pam_timestamp was written by Nalin Dahyabhai. + diff --git a/modules/pam_timestamp/README.xml b/modules/pam_timestamp/README.xml new file mode 100644 index 0000000..5b72deb --- /dev/null +++ b/modules/pam_timestamp/README.xml @@ -0,0 +1,46 @@ +<?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_timestamp.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_timestamp-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_timestamp-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_timestamp-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_timestamp-notes"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_timestamp-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_timestamp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_timestamp-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_timestamp/hmacfile.c b/modules/pam_timestamp/hmacfile.c new file mode 100644 index 0000000..7c1f8bf --- /dev/null +++ b/modules/pam_timestamp/hmacfile.c @@ -0,0 +1,159 @@ +/* + * Copyright 2003,2004 Red Hat, Inc. + * + * 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 <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include "hmacsha1.h" + +static void +testvectors(void) +{ + void *hmac; + size_t hmac_len; + size_t i, j; + char hex[3]; + struct vector { + const char *key; + int key_len; + const char *data; + int data_len; + const char *hmac; + } vectors[] = { + { + "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b", 20, + "Hi There", 8, + "b617318655057264e28bc0b6fb378c8ef146be00", + }, + +#ifdef HMAC_ALLOW_SHORT_KEYS + { + "Jefe", 4, + "what do ya want for nothing?", 28, + "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79", + }, +#endif + + { + "\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa", 20, + "\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd", 50, + "125d7342b9ac11cd91a39af48aa17b4f63f175d3", + }, + + { + "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19", 25, + "\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd", + 50, + "4c9007f4026250c6bc8414f9bf50c86c2d7235da", + }, + + { + "\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c", 20, + "Test With Truncation", 20, + "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04", + }, + + { + "\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa", + 80, + "Test Using Larger Than Block-Size Key - Hash Key First", 54, + "aa4ae5e15272d00e95705637ce8a3b55ed402112", + }, + + { + "\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa", + 80, + "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data", 73, + "e8e99d0f45237d786d6bbaa7965c7808bbff1a91", + }, + }; + for (i = 0; i < sizeof(vectors) / sizeof(vectors[0]); i++) { + hmac = NULL; + hmac_len = 0; + hmac_sha1_generate(&hmac, &hmac_len, + vectors[i].key, vectors[i].key_len, + vectors[i].data, vectors[i].data_len); + if (hmac != NULL) { + unsigned char *hmacc = hmac; + for (j = 0; j < hmac_len; j++) { + snprintf(hex, sizeof(hex), "%02x", + hmacc[j] & 0xff); + if (strncasecmp(hex, + vectors[i].hmac + 2 * j, + 2) != 0) { + printf("Incorrect result for vector %lu\n", i + 1); + exit(1); + + } + } + free(hmac); + } else { + printf("Error in vector %lu.\n", i + 1); + exit(1); + } + } +} + +int +main(int argc, char **argv) +{ + void *hmac; + size_t maclen; + const char *keyfile; + int i; + size_t j; + + testvectors(); + + keyfile = argv[1]; + for (i = 2; i < argc; i++) { + hmac_sha1_generate_file(NULL, &hmac, &maclen, keyfile, -1, -1, + argv[i], strlen(argv[i])); + if (hmac != NULL) { + unsigned char *hmacc = hmac; + for (j = 0; j < maclen; j++) { + printf("%02x", hmacc[j] & 0xff); + } + printf(" %s\n", argv[i]); + free(hmac); + } + } + return 0; +} diff --git a/modules/pam_timestamp/hmacsha1.c b/modules/pam_timestamp/hmacsha1.c new file mode 100644 index 0000000..3f41106 --- /dev/null +++ b/modules/pam_timestamp/hmacsha1.c @@ -0,0 +1,294 @@ +/* An implementation of HMAC using SHA-1. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * 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. + * + */ +/* See RFC 2104 for descriptions. */ +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <grp.h> +#include <pwd.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <syslog.h> +#include <security/pam_ext.h> +#include "hmacsha1.h" +#include "sha1.h" + +#define MINIMUM_KEY_SIZE SHA1_OUTPUT_SIZE +#define MAXIMUM_KEY_SIZE SHA1_BLOCK_SIZE + +static void +hmac_key_create(pam_handle_t *pamh, const char *filename, size_t key_size, + uid_t owner, gid_t group) +{ + int randfd, keyfd, i; + size_t count; + char *key; + + /* Open the destination file. */ + keyfd = open(filename, + O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, + S_IRUSR | S_IWUSR); + if (keyfd == -1) { + pam_syslog(pamh, LOG_ERR, "Cannot create %s: %m", filename); + return; + } + + + if (fchown(keyfd, owner, group) == -1) { + pam_syslog(pamh, LOG_ERR, "Cannot chown %s: %m", filename); + close(keyfd); + return; + } + + /* Open the random device to get key data. */ + randfd = open("/dev/urandom", O_RDONLY); + if (randfd == -1) { + pam_syslog(pamh, LOG_ERR, "Cannot open /dev/urandom: %m"); + close(keyfd); + return; + } + + /* Read random data for use as the key. */ + key = malloc(key_size); + count = 0; + if (!key) { + close(keyfd); + close(randfd); + return; + } + while (count < key_size) { + i = read(randfd, key + count, key_size - count); + if ((i == 0) || (i == -1)) { + break; + } + count += i; + } + + close(randfd); + + /* If we didn't get enough, stop here. */ + if (count < key_size) { + pam_syslog(pamh, LOG_ERR, "Short read on random device"); + memset(key, 0, key_size); + free(key); + close(keyfd); + return; + } + + /* Now write the key. */ + count = 0; + while (count < key_size) { + i = write(keyfd, key + count, key_size - count); + if ((i == 0) || (i == -1)) { + break; + } + count += i; + } + memset(key, 0, key_size); + free(key); + close(keyfd); +} + +static void +hmac_key_read(pam_handle_t *pamh, const char *filename, size_t default_key_size, + uid_t owner, gid_t group, + void **key, size_t *key_size) +{ + char *tmp; + int keyfd, i, count; + struct stat st; + + tmp = NULL; + *key = NULL; + *key_size = 0; + + /* Try to open the key file. */ + keyfd = open(filename, O_RDONLY); + if (keyfd == -1) { + /* No such thing? Create it. */ + if (errno == ENOENT) { + hmac_key_create(pamh, filename, default_key_size, + owner, group); + keyfd = open(filename, O_RDONLY); + } else { + pam_syslog(pamh, LOG_ERR, "Cannot open %s: %m", filename); + } + if (keyfd == -1) + return; + } + + /* If we failed to open the file, we're done. */ + if (fstat(keyfd, &st) == -1) { + close(keyfd); + return; + } + + /* Read the contents of the file. */ + tmp = malloc(st.st_size); + if (!tmp) { + close(keyfd); + return; + } + + count = 0; + while (count < st.st_size) { + i = read(keyfd, tmp + count, st.st_size - count); + if ((i == 0) || (i == -1)) { + break; + } + count += i; + } + close(keyfd); + + /* Require that we got the expected amount of data. */ + if (count < st.st_size) { + memset(tmp, 0, st.st_size); + free(tmp); + return; + } + + /* Pass the key back. */ + *key = tmp; + *key_size = st.st_size; +} + +static void +xor_block(unsigned char *p, unsigned char byte, size_t length) +{ + size_t i; + for (i = 0; i < length; i++) { + p[i] = p[i] ^ byte; + } +} + +void +hmac_sha1_generate(void **mac, size_t *mac_length, + const void *raw_key, size_t raw_key_size, + const void *text, size_t text_length) +{ + unsigned char key[MAXIMUM_KEY_SIZE], tmp_key[MAXIMUM_KEY_SIZE]; + size_t maximum_key_size = SHA1_BLOCK_SIZE, + minimum_key_size = SHA1_OUTPUT_SIZE; + const unsigned char ipad = 0x36, opad = 0x5c; + struct sha1_context sha1; + unsigned char inner[SHA1_OUTPUT_SIZE], outer[SHA1_OUTPUT_SIZE]; + + *mac = NULL; + *mac_length = 0; + +#ifndef HMAC_ALLOW_SHORT_KEYS + /* If the key is too short, don't bother. */ + if (raw_key_size < minimum_key_size) { + return; + } +#endif + + /* If the key is too long, "compress" it, else copy it and pad it + * out with zero bytes. */ + memset(key, 0, sizeof(key)); + if (raw_key_size > maximum_key_size) { + sha1_init(&sha1); + sha1_update(&sha1, raw_key, raw_key_size); + sha1_output(&sha1, key); + } else { + memmove(key, raw_key, raw_key_size); + } + + /* Generate the inner sum. */ + memcpy(tmp_key, key, sizeof(tmp_key)); + xor_block(tmp_key, ipad, sizeof(tmp_key)); + + sha1_init(&sha1); + sha1_update(&sha1, tmp_key, sizeof(tmp_key)); + sha1_update(&sha1, text, text_length); + sha1_output(&sha1, inner); + + /* Generate the outer sum. */ + memcpy(tmp_key, key, sizeof(tmp_key)); + xor_block(tmp_key, opad, sizeof(tmp_key)); + + sha1_init(&sha1); + sha1_update(&sha1, tmp_key, sizeof(tmp_key)); + sha1_update(&sha1, inner, sizeof(inner)); + sha1_output(&sha1, outer); + + /* We don't need any of the keys any more. */ + memset(key, 0, sizeof(key)); + memset(tmp_key, 0, sizeof(tmp_key)); + + /* Allocate space to store the output. */ + *mac_length = sizeof(outer); + *mac = malloc(*mac_length); + if (*mac == NULL) { + *mac_length = 0; + return; + } + + memcpy(*mac, outer, *mac_length); +} + +void +hmac_sha1_generate_file(pam_handle_t *pamh, void **mac, size_t *mac_length, + const char *keyfile, uid_t owner, gid_t group, + const void *text, size_t text_length) +{ + void *key; + size_t key_length; + + hmac_key_read(pamh, keyfile, + MAXIMUM_KEY_SIZE, owner, group, + &key, &key_length); + if (key == NULL) { + *mac = NULL; + *mac_length = 0; + return; + } + hmac_sha1_generate(mac, mac_length, + key, key_length, + text, text_length); + memset(key, 0, key_length); + free(key); +} + +size_t +hmac_sha1_size(void) +{ + return SHA1_OUTPUT_SIZE; +} diff --git a/modules/pam_timestamp/hmacsha1.h b/modules/pam_timestamp/hmacsha1.h new file mode 100644 index 0000000..200d1d0 --- /dev/null +++ b/modules/pam_timestamp/hmacsha1.h @@ -0,0 +1,15 @@ +#ifndef pam_timestamp_hmacfile_h +#define pam_timestamp_hmacfile_h + +#include <sys/types.h> +#include <security/pam_modules.h> + +size_t hmac_sha1_size(void); +void hmac_sha1_generate(void **mac, size_t *mac_length, + const void *key, size_t key_length, + const void *text, size_t text_length); +void hmac_sha1_generate_file(pam_handle_t *pamh, void **mac, size_t *mac_length, + const char *keyfile, uid_t owner, gid_t group, + const void *text, size_t text_length); + +#endif diff --git a/modules/pam_timestamp/pam_timestamp.8 b/modules/pam_timestamp/pam_timestamp.8 new file mode 100644 index 0000000..5e804ab --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp.8 @@ -0,0 +1,130 @@ +'\" t +.\" Title: pam_timestamp +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/> +.\" Date: 05/18/2017 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_TIMESTAMP" "8" "05/18/2017" "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_timestamp \- Authenticate using cached successful authentication attempts +.SH "SYNOPSIS" +.HP \w'\fBpam_timestamp\&.so\fR\ 'u +\fBpam_timestamp\&.so\fR [timestampdir=\fIdirectory\fR] [timestamp_timeout=\fInumber\fR] [verbose] [debug] +.SH "DESCRIPTION" +.PP +In a nutshell, +\fIpam_timestamp\fR +caches successful authentication attempts, and allows you to use a recent successful attempt as the basis for authentication\&. This is similar mechanism which is used in +\fBsudo\fR\&. +.PP +When an application opens a session using +\fIpam_timestamp\fR, a timestamp file is created in the +\fItimestampdir\fR +directory for the user\&. When an application attempts to authenticate the user, a +\fIpam_timestamp\fR +will treat a sufficiently recent timestamp file as grounds for succeeding\&. +.SH "OPTIONS" +.PP +\fBtimestampdir=\fR\fB\fIdirectory\fR\fR +.RS 4 +Specify an alternate directory where +\fIpam_timestamp\fR +creates timestamp files\&. +.RE +.PP +\fBtimestamp_timeout=\fR\fB\fInumber\fR\fR +.RS 4 +How long should +\fIpam_timestamp\fR +treat timestamp as valid after their last modification date (in seconds)\&. Default is 300 seconds\&. +.RE +.PP +\fBverbose\fR +.RS 4 +Attempt to inform the user when access is granted\&. +.RE +.PP +\fBdebug\fR +.RS 4 +Turns on debugging messages sent to +\fBsyslog\fR(3)\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +The +\fBauth\fR +and +\fBsession\fR +module types are provided\&. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +The module was not able to retrieve the user name or no valid timestamp file was found\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +Everything was successful\&. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +Timestamp file could not be created or updated\&. +.RE +.SH "NOTES" +.PP +Users can get confused when they are not always asked for passwords when running a given program\&. Some users reflexively begin typing information before noticing that it is not being asked for\&. +.SH "EXAMPLES" +.sp +.if n \{\ +.RS 4 +.\} +.nf +auth sufficient pam_timestamp\&.so verbose +auth required pam_unix\&.so + +session required pam_unix\&.so +session optional pam_timestamp\&.so + +.fi +.if n \{\ +.RE +.\} +.SH "FILES" +.PP +/var/run/pam_timestamp/\&.\&.\&. +.RS 4 +timestamp files and directories +.RE +.SH "SEE ALSO" +.PP +\fBpam_timestamp_check\fR(8), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_timestamp was written by Nalin Dahyabhai\&. diff --git a/modules/pam_timestamp/pam_timestamp.8.xml b/modules/pam_timestamp/pam_timestamp.8.xml new file mode 100644 index 0000000..e19a0bc --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp.8.xml @@ -0,0 +1,203 @@ +<?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_timestamp"> + + <refmeta> + <refentrytitle>pam_timestamp</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_timestamp-name"> + <refname>pam_timestamp</refname> + <refpurpose>Authenticate using cached successful authentication attempts</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_timestamp-cmdsynopsis"> + <command>pam_timestamp.so</command> + <arg choice="opt"> + timestampdir=<replaceable>directory</replaceable> + </arg> + <arg choice="opt"> + timestamp_timeout=<replaceable>number</replaceable> + </arg> + <arg choice="opt"> + verbose + </arg> + <arg choice="opt"> + debug + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_timestamp-description"> + + <title>DESCRIPTION</title> + + <para> + In a nutshell, <emphasis>pam_timestamp</emphasis> caches successful +authentication attempts, and allows you to use a recent successful attempt as +the basis for authentication. This is similar mechanism which is used in +<command>sudo</command>. + </para> + <para> + When an application opens a session using <emphasis>pam_timestamp</emphasis>, +a timestamp file is created in the <emphasis>timestampdir</emphasis> directory +for the user. When an application attempts to authenticate the user, a +<emphasis>pam_timestamp</emphasis> will treat a sufficiently recent timestamp +file as grounds for succeeding. + </para> + </refsect1> + + <refsect1 id="pam_timestamp-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>timestampdir=<replaceable>directory</replaceable></option> + </term> + <listitem> + <para> + Specify an alternate directory where + <emphasis>pam_timestamp</emphasis> creates timestamp files. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>timestamp_timeout=<replaceable>number</replaceable></option> + </term> + <listitem> + <para> + How long should <emphasis>pam_timestamp</emphasis> + treat timestamp as valid after their + last modification date (in seconds). Default is 300 seconds. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>verbose</option> + </term> + <listitem> + <para> + Attempt to inform the user when access is granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging messages sent to <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_timestamp-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + The <option>auth</option> and <option>session</option> + module types are provided. + </para> + </refsect1> + + <refsect1 id='pam_timestamp-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The module was not able to retrieve the user name or + no valid timestamp file was found. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Everything was successful. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + Timestamp file could not be created or updated. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_timestamp-notes'> + <title>NOTES</title> + <para> + Users can get confused when they are not always asked for passwords when +running a given program. Some users reflexively begin typing information before +noticing that it is not being asked for. + </para> + </refsect1> + + <refsect1 id='pam_timestamp-examples'> + <title>EXAMPLES</title> + <programlisting> +auth sufficient pam_timestamp.so verbose +auth required pam_unix.so + +session required pam_unix.so +session optional pam_timestamp.so + </programlisting> + </refsect1> + + <refsect1 id="pam_timestamp-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/var/run/pam_timestamp/...</filename></term> + <listitem> + <para>timestamp files and directories</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_timestamp-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_timestamp_check</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <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_timestamp-author'> + <title>AUTHOR</title> + <para> + pam_timestamp was written by Nalin Dahyabhai. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_timestamp/pam_timestamp.c b/modules/pam_timestamp/pam_timestamp.c new file mode 100644 index 0000000..e29ce6e --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp.c @@ -0,0 +1,836 @@ +/****************************************************************************** + * A module for Linux-PAM that will cache authentication results, inspired by + * (and implemented with an eye toward being mixable with) sudo. + * + * Copyright (c) 2002 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * 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. + * + */ + +#define PAM_SM_AUTH +#define PAM_SM_SESSION + +#include "config.h" + +#include <sys/stat.h> +#include <sys/types.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <pwd.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <sys/time.h> +#include <unistd.h> +#include <utmp.h> +#include <syslog.h> +#include <paths.h> +#include "hmacsha1.h" + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +/* The default timeout we use is 5 minutes, which matches the sudo default + * for the timestamp_timeout parameter. */ +#define DEFAULT_TIMESTAMP_TIMEOUT (5 * 60) +#define MODULE "pam_timestamp" +#define TIMESTAMPDIR _PATH_VARRUN "/" MODULE +#define TIMESTAMPKEY TIMESTAMPDIR "/_pam_timestamp_key" + +/* Various buffers we use need to be at least as large as either PATH_MAX or + * LINE_MAX, so choose the larger of the two. */ +#if (LINE_MAX > PATH_MAX) +#define BUFLEN LINE_MAX +#else +#define BUFLEN PATH_MAX +#endif + +/* Return PAM_SUCCESS if the given directory looks "safe". */ +static int +check_dir_perms(pam_handle_t *pamh, const char *tdir) +{ + char scratch[BUFLEN]; + struct stat st; + int i; + /* Check that the directory is "safe". */ + if ((tdir == NULL) || (strlen(tdir) == 0)) { + return PAM_AUTH_ERR; + } + /* Iterate over the path, checking intermediate directories. */ + memset(scratch, 0, sizeof(scratch)); + for (i = 0; (tdir[i] != '\0') && (i < (int)sizeof(scratch)); i++) { + scratch[i] = tdir[i]; + if ((scratch[i] == '/') || (tdir[i + 1] == '\0')) { + /* We now have the name of a directory in the path, so + * we need to check it. */ + if ((lstat(scratch, &st) == -1) && (errno != ENOENT)) { + pam_syslog(pamh, LOG_ERR, + "unable to read `%s': %m", + scratch); + return PAM_AUTH_ERR; + } + if (!S_ISDIR(st.st_mode)) { + pam_syslog(pamh, LOG_ERR, + "`%s' is not a directory", + scratch); + return PAM_AUTH_ERR; + } + if (S_ISLNK(st.st_mode)) { + pam_syslog(pamh, LOG_ERR, + "`%s' is a symbolic link", + scratch); + return PAM_AUTH_ERR; + } + if (st.st_uid != 0) { + pam_syslog(pamh, LOG_ERR, + "`%s' owner UID != 0", + scratch); + return PAM_AUTH_ERR; + } + if (st.st_gid != 0) { + pam_syslog(pamh, LOG_ERR, + "`%s' owner GID != 0", + scratch); + return PAM_AUTH_ERR; + } + if ((st.st_mode & (S_IWGRP | S_IWOTH)) != 0) { + pam_syslog(pamh, LOG_ERR, + "`%s' permissions are lax", + scratch); + return PAM_AUTH_ERR; + } + } + } + return PAM_SUCCESS; +} + +/* Validate a tty pathname as actually belonging to a tty, and return its base + * name if it's valid. */ +static const char * +check_tty(const char *tty) +{ + /* Check that we're not being set up to take a fall. */ + if ((tty == NULL) || (strlen(tty) == 0)) { + return NULL; + } + /* Pull out the meaningful part of the tty's name. */ + if (strchr(tty, '/') != NULL) { + if (strncmp(tty, "/dev/", 5) != 0) { + /* Make sure the device node is actually in /dev/, + * noted by Michal Zalewski. */ + return NULL; + } + tty = strrchr(tty, '/') + 1; + } + /* Make sure the tty wasn't actually a directory (no basename). */ + if (!strlen(tty) || !strcmp(tty, ".") || !strcmp(tty, "..")) { + return NULL; + } + return tty; +} + +/* Determine the right path name for a given user's timestamp. */ +static int +format_timestamp_name(char *path, size_t len, + const char *timestamp_dir, + const char *tty, + const char *ruser, + const char *user) +{ + if (strcmp(ruser, user) == 0) { + return snprintf(path, len, "%s/%s/%s", timestamp_dir, + ruser, tty); + } else { + return snprintf(path, len, "%s/%s/%s:%s", timestamp_dir, + ruser, tty, user); + } +} + +/* Check if a given timestamp date, when compared to a current time, fits + * within the given interval. */ +static int +timestamp_good(time_t then, time_t now, time_t interval) +{ + if (((now >= then) && ((now - then) < interval)) || + ((now < then) && ((then - now) < (2 * interval)))) { + return PAM_SUCCESS; + } + return PAM_AUTH_ERR; +} + +static int +check_login_time(const char *ruser, time_t timestamp) +{ + struct utmp utbuf, *ut; + time_t oldest_login = 0; + + setutent(); + while( +#ifdef HAVE_GETUTENT_R + !getutent_r(&utbuf, &ut) +#else + (ut = getutent()) != NULL +#endif + ) { + if (ut->ut_type != USER_PROCESS) { + continue; + } + if (strncmp(ruser, ut->ut_user, sizeof(ut->ut_user)) != 0) { + continue; + } + if (oldest_login == 0 || oldest_login > ut->ut_tv.tv_sec) { + oldest_login = ut->ut_tv.tv_sec; + } + } + endutent(); + if(oldest_login == 0 || timestamp < oldest_login) { + return PAM_AUTH_ERR; + } + return PAM_SUCCESS; +} + +#ifndef PAM_TIMESTAMP_MAIN +static int +get_ruser(pam_handle_t *pamh, char *ruserbuf, size_t ruserbuflen) +{ + const void *ruser; + struct passwd *pwd; + + if (ruserbuf == NULL || ruserbuflen < 1) + return -2; + /* Get the name of the source user. */ + if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS) { + ruser = NULL; + } + if ((ruser == NULL) || (strlen(ruser) == 0)) { + /* Barring that, use the current RUID. */ + pwd = pam_modutil_getpwuid(pamh, getuid()); + if (pwd != NULL) { + ruser = pwd->pw_name; + } + } else { + /* + * This ruser is used by format_timestamp_name as a component + * of constructed timestamp pathname, so ".", "..", and '/' + * are disallowed to avoid potential path traversal issues. + */ + if (!strcmp(ruser, ".") || + !strcmp(ruser, "..") || + strchr(ruser, '/')) { + ruser = NULL; + } + } + if (ruser == NULL || strlen(ruser) >= ruserbuflen) { + *ruserbuf = '\0'; + return -1; + } + strcpy(ruserbuf, ruser); + return 0; +} + +/* Get the path to the timestamp to use. */ +static int +get_timestamp_name(pam_handle_t *pamh, int argc, const char **argv, + char *path, size_t len) +{ + const char *user, *tty; + const void *void_tty; + const char *tdir = TIMESTAMPDIR; + char ruser[BUFLEN]; + int i, debug = 0; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + } + for (i = 0; i < argc; i++) { + if (strncmp(argv[i], "timestampdir=", 13) == 0) { + tdir = argv[i] + 13; + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "storing timestamps in `%s'", + tdir); + } + } + } + i = check_dir_perms(pamh, tdir); + if (i != PAM_SUCCESS) { + return i; + } + /* Get the name of the target user. */ + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) { + user = NULL; + } + if ((user == NULL) || (strlen(user) == 0)) { + return PAM_AUTH_ERR; + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "becoming user `%s'", user); + } + /* Get the name of the source user. */ + if (get_ruser(pamh, ruser, sizeof(ruser)) || strlen(ruser) == 0) { + return PAM_AUTH_ERR; + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "currently user `%s'", ruser); + } + /* Get the name of the terminal. */ + if (pam_get_item(pamh, PAM_TTY, &void_tty) != PAM_SUCCESS) { + tty = NULL; + } else { + tty = void_tty; + } + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDIN_FILENO); + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDOUT_FILENO); + } + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDERR_FILENO); + } + if ((tty == NULL) || (strlen(tty) == 0)) { + /* Match sudo's behavior for this case. */ + tty = "unknown"; + } + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "tty is `%s'", tty); + } + /* Snip off all but the last part of the tty name. */ + tty = check_tty(tty); + if (tty == NULL) { + return PAM_AUTH_ERR; + } + /* Generate the name of the file used to cache auth results. These + * paths should jive with sudo's per-tty naming scheme. */ + if (format_timestamp_name(path, len, tdir, tty, ruser, user) >= (int)len) { + return PAM_AUTH_ERR; + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "using timestamp file `%s'", path); + } + return PAM_SUCCESS; +} + +/* Tell the user that access has been granted. */ +static void +verbose_success(pam_handle_t *pamh, long diff) +{ + pam_info(pamh, _("Access granted (last access was %ld seconds ago)."), diff); +} + +int +pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + struct stat st; + time_t interval = DEFAULT_TIMESTAMP_TIMEOUT; + int i, fd, debug = 0, verbose = 0; + char path[BUFLEN], *p, *message, *message_end; + long tmp; + const void *void_service; + const char *service; + time_t now, then; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + } + for (i = 0; i < argc; i++) { + if (strncmp(argv[i], "timestamp_timeout=", 18) == 0) { + tmp = strtol(argv[i] + 18, &p, 0); + if ((p != NULL) && (*p == '\0')) { + interval = tmp; + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "setting timeout to %ld" + " seconds", (long)interval); + } + } + } else + if (strcmp(argv[i], "verbose") == 0) { + verbose = 1; + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "becoming more verbose"); + } + } + } + + if (flags & PAM_SILENT) { + verbose = 0; + } + + /* Get the name of the timestamp file. */ + if (get_timestamp_name(pamh, argc, argv, + path, sizeof(path)) != PAM_SUCCESS) { + return PAM_AUTH_ERR; + } + + /* Get the name of the service. */ + if (pam_get_item(pamh, PAM_SERVICE, &void_service) != PAM_SUCCESS) { + service = NULL; + } else { + service = void_service; + } + if ((service == NULL) || (strlen(service) == 0)) { + service = "(unknown)"; + } + + /* Open the timestamp file. */ + fd = open(path, O_RDONLY | O_NOFOLLOW); + if (fd == -1) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "cannot open timestamp `%s': %m", + path); + } + return PAM_AUTH_ERR; + } + + if (fstat(fd, &st) == 0) { + int count; + void *mac; + size_t maclen; + char ruser[BUFLEN]; + + /* Check that the file is owned by the superuser. */ + if ((st.st_uid != 0) || (st.st_gid != 0)) { + pam_syslog(pamh, LOG_ERR, "timestamp file `%s' is " + "not owned by root", path); + close(fd); + return PAM_AUTH_ERR; + } + + /* Check that the file is a normal file. */ + if (!(S_ISREG(st.st_mode))) { + pam_syslog(pamh, LOG_ERR, "timestamp file `%s' is " + "not a regular file", path); + close(fd); + return PAM_AUTH_ERR; + } + + /* Check that the file is the expected size. */ + if (st.st_size == 0) { + /* Invalid, but may have been created by sudo. */ + close(fd); + return PAM_AUTH_ERR; + } + if (st.st_size != + (off_t)(strlen(path) + 1 + sizeof(then) + hmac_sha1_size())) { + pam_syslog(pamh, LOG_NOTICE, "timestamp file `%s' " + "appears to be corrupted", path); + close(fd); + return PAM_AUTH_ERR; + } + + /* Read the file contents. */ + message = malloc(st.st_size); + count = 0; + if (!message) { + close(fd); + return PAM_BUF_ERR; + } + while (count < st.st_size) { + i = read(fd, message + count, st.st_size - count); + if ((i == 0) || (i == -1)) { + break; + } + count += i; + } + if (count < st.st_size) { + pam_syslog(pamh, LOG_NOTICE, "error reading timestamp " + "file `%s': %m", path); + close(fd); + free(message); + return PAM_AUTH_ERR; + } + message_end = message + strlen(path) + 1 + sizeof(then); + + /* Regenerate the MAC. */ + hmac_sha1_generate_file(pamh, &mac, &maclen, TIMESTAMPKEY, 0, 0, + message, message_end - message); + if ((mac == NULL) || + (memcmp(path, message, strlen(path)) != 0) || + (memcmp(mac, message_end, maclen) != 0)) { + pam_syslog(pamh, LOG_NOTICE, "timestamp file `%s' is " + "corrupted", path); + close(fd); + free(mac); + free(message); + return PAM_AUTH_ERR; + } + free(mac); + memmove(&then, message + strlen(path) + 1, sizeof(then)); + free(message); + + /* Check oldest login against timestamp */ + if (get_ruser(pamh, ruser, sizeof(ruser))) + { + close(fd); + return PAM_AUTH_ERR; + } + if (check_login_time(ruser, then) != PAM_SUCCESS) + { + pam_syslog(pamh, LOG_NOTICE, "timestamp file `%s' is " + "older than oldest login, disallowing " + "access to %s for user %s", + path, service, ruser); + close(fd); + return PAM_AUTH_ERR; + } + + /* Compare the dates. */ + now = time(NULL); + if (timestamp_good(then, now, interval) == PAM_SUCCESS) { + close(fd); + pam_syslog(pamh, LOG_NOTICE, "timestamp file `%s' is " + "only %ld seconds old, allowing access to %s " + "for user %s", path, (long) (now - st.st_mtime), + service, ruser); + if (verbose) { + verbose_success(pamh, now - st.st_mtime); + } + return PAM_SUCCESS; + } else { + close(fd); + pam_syslog(pamh, LOG_NOTICE, "timestamp file `%s' has " + "unacceptable age (%ld seconds), disallowing " + "access to %s for user %s", + path, (long) (now - st.st_mtime), + service, ruser); + return PAM_AUTH_ERR; + } + } + close(fd); + + /* Fail by default. */ + return PAM_AUTH_ERR; +} + +int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +int +pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, int argc, const char **argv) +{ + char path[BUFLEN], subdir[BUFLEN], *text, *p; + void *mac; + size_t maclen; + time_t now; + int fd, i, debug = 0; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + } + + /* Get the name of the timestamp file. */ + if (get_timestamp_name(pamh, argc, argv, + path, sizeof(path)) != PAM_SUCCESS) { + return PAM_SESSION_ERR; + } + + /* Create the directory for the timestamp file if it doesn't already + * exist. */ + for (i = 1; path[i] != '\0'; i++) { + if (path[i] == '/') { + /* Attempt to create the directory. */ + strncpy(subdir, path, i); + subdir[i] = '\0'; + if (mkdir(subdir, 0700) == 0) { + /* Attempt to set the owner to the superuser. */ + if (lchown(subdir, 0, 0) != 0) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "error setting permissions on `%s': %m", + subdir); + } + return PAM_SESSION_ERR; + } + } else { + if (errno != EEXIST) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "error creating directory `%s': %m", + subdir); + } + return PAM_SESSION_ERR; + } + } + } + } + + /* Generate the message. */ + text = malloc(strlen(path) + 1 + sizeof(now) + hmac_sha1_size()); + if (text == NULL) { + pam_syslog(pamh, LOG_CRIT, "unable to allocate memory: %m"); + return PAM_SESSION_ERR; + } + p = text; + + strcpy(text, path); + p += strlen(path) + 1; + + now = time(NULL); + memmove(p, &now, sizeof(now)); + p += sizeof(now); + + /* Generate the MAC and append it to the plaintext. */ + hmac_sha1_generate_file(pamh, &mac, &maclen, + TIMESTAMPKEY, + 0, 0, + text, p - text); + if (mac == NULL) { + pam_syslog(pamh, LOG_ERR, "failure generating MAC: %m"); + free(text); + return PAM_SESSION_ERR; + } + memmove(p, mac, maclen); + p += maclen; + free(mac); + + /* Open the file. */ + fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); + if (fd == -1) { + pam_syslog(pamh, LOG_ERR, "unable to open `%s': %m", path); + free(text); + return PAM_SESSION_ERR; + } + + /* Attempt to set the owner to the superuser. */ + if (fchown(fd, 0, 0) != 0) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "error setting ownership of `%s': %m", + path); + } + close(fd); + free(text); + return PAM_SESSION_ERR; + } + + + /* Write the timestamp to the file. */ + if (write(fd, text, p - text) != p - text) { + pam_syslog(pamh, LOG_ERR, "unable to write to `%s': %m", path); + close(fd); + free(text); + return PAM_SESSION_ERR; + } + + /* Close the file and return successfully. */ + close(fd); + free(text); + pam_syslog(pamh, LOG_DEBUG, "updated timestamp file `%s'", path); + return PAM_SUCCESS; +} + +int +pam_sm_close_session(pam_handle_t *pamh UNUSED, int flags UNUSED, int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +#else /* PAM_TIMESTAMP_MAIN */ + +#define USAGE "Usage: %s [[-k] | [-d]] [target user]\n" +#define CHECK_INTERVAL 7 + +int +main(int argc, char **argv) +{ + int i, retval = 0, dflag = 0, kflag = 0; + const char *target_user = NULL, *user = NULL, *tty = NULL; + struct passwd *pwd; + struct timeval tv; + fd_set write_fds; + char path[BUFLEN]; + struct stat st; + + /* Check that there's nothing funny going on with stdio. */ + if ((fstat(STDIN_FILENO, &st) == -1) || + (fstat(STDOUT_FILENO, &st) == -1) || + (fstat(STDERR_FILENO, &st) == -1)) { + /* Appropriate the "no controlling tty" error code. */ + return 3; + } + + /* Parse arguments. */ + while ((i = getopt(argc, argv, "dk")) != -1) { + switch (i) { + case 'd': + dflag++; + break; + case 'k': + kflag++; + break; + default: + fprintf(stderr, USAGE, argv[0]); + return 1; + break; + } + } + + /* Bail if both -k and -d are given together. */ + if ((kflag + dflag) > 1) { + fprintf(stderr, USAGE, argv[0]); + return 1; + } + + /* Check that we're setuid. */ + if (geteuid() != 0) { + fprintf(stderr, "%s must be setuid root\n", + argv[0]); + retval = 2; + } + + /* Check that we have a controlling tty. */ + tty = ttyname(STDIN_FILENO); + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDOUT_FILENO); + } + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDERR_FILENO); + } + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = "unknown"; + } + + /* Get the name of the invoking (requesting) user. */ + pwd = getpwuid(getuid()); + if (pwd == NULL) { + retval = 4; + } + + /* Get the name of the target user. */ + user = strdup(pwd->pw_name); + if (user == NULL) { + retval = 4; + } else { + target_user = (optind < argc) ? argv[optind] : user; + if ((strchr(target_user, '.') != NULL) || + (strchr(target_user, '/') != NULL) || + (strchr(target_user, '%') != NULL)) { + fprintf(stderr, "unknown user: %s\n", + target_user); + retval = 4; + } + } + + /* Sanity check the tty to make sure we should be checking + * for timestamps which pertain to it. */ + if (retval == 0) { + tty = check_tty(tty); + if (tty == NULL) { + fprintf(stderr, "invalid tty\n"); + retval = 6; + } + } + + do { + /* Sanity check the timestamp directory itself. */ + if (retval == 0) { + if (check_dir_perms(NULL, TIMESTAMPDIR) != PAM_SUCCESS) { + retval = 5; + } + } + + if (retval == 0) { + /* Generate the name of the timestamp file. */ + format_timestamp_name(path, sizeof(path), TIMESTAMPDIR, + tty, user, target_user); + } + + if (retval == 0) { + if (kflag) { + /* Remove the timestamp. */ + if (lstat(path, &st) != -1) { + retval = unlink(path); + } + } else { + /* Check the timestamp. */ + if (lstat(path, &st) != -1) { + /* Check oldest login against timestamp */ + if (check_login_time(user, st.st_mtime) != PAM_SUCCESS) { + retval = 7; + } else if (!timestamp_good(st.st_mtime, time(NULL), + DEFAULT_TIMESTAMP_TIMEOUT) == PAM_SUCCESS) { + retval = 7; + } + } else { + retval = 7; + } + } + } + + if (dflag > 0) { + struct timeval now; + /* Send the would-be-returned value to our parent. */ + signal(SIGPIPE, SIG_DFL); + fprintf(stdout, "%d\n", retval); + fflush(stdout); + /* Wait. */ + gettimeofday(&now, NULL); + tv.tv_sec = CHECK_INTERVAL; + /* round the sleep time to get woken up on a whole second */ + tv.tv_usec = 1000000 - now.tv_usec; + if (now.tv_usec < 500000) + tv.tv_sec--; + FD_ZERO(&write_fds); + FD_SET(STDOUT_FILENO, &write_fds); + select(STDOUT_FILENO + 1, + NULL, NULL, &write_fds, + &tv); + retval = 0; + } + } while (dflag > 0); + + return retval; +} + +#endif diff --git a/modules/pam_timestamp/pam_timestamp_check.8 b/modules/pam_timestamp/pam_timestamp_check.8 new file mode 100644 index 0000000..b90ab31 --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp_check.8 @@ -0,0 +1,133 @@ +'\" t +.\" Title: pam_timestamp_check +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/> +.\" Date: 05/18/2017 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_TIMESTAMP_CHECK" "8" "05/18/2017" "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_timestamp_check \- Check to see if the default timestamp is valid +.SH "SYNOPSIS" +.HP \w'\fBpam_timestamp_check\fR\ 'u +\fBpam_timestamp_check\fR [\-k] [\-d] [\fItarget_user\fR] +.SH "DESCRIPTION" +.PP +With no arguments +\fBpam_timestamp_check\fR +will check to see if the default timestamp is valid, or optionally remove it\&. +.SH "OPTIONS" +.PP +\fB\-k\fR +.RS 4 +Instead of checking the validity of a timestamp, remove it\&. This is analogous to sudo\*(Aqs +\fI\-k\fR +option\&. +.RE +.PP +\fB\-d\fR +.RS 4 +Instead of returning validity using an exit status, loop indefinitely, polling regularly and printing the status on standard output\&. +.RE +.PP +\fB\fItarget_user\fR\fR +.RS 4 +By default +\fBpam_timestamp_check\fR +checks or removes timestamps generated by +\fIpam_timestamp\fR +when the user authenticates as herself\&. When the user authenticates as a different user, the name of the timestamp file changes to accommodate this\&. +\fItarget_user\fR +allows to specify this user name\&. +.RE +.SH "RETURN VALUES" +.PP +0 +.RS 4 +The timestamp is valid\&. +.RE +.PP +2 +.RS 4 +The binary is not setuid root\&. +.RE +.PP +3 +.RS 4 +Invalid invocation\&. +.RE +.PP +4 +.RS 4 +User is unknown\&. +.RE +.PP +5 +.RS 4 +Permissions error\&. +.RE +.PP +6 +.RS 4 +Invalid controlling tty\&. +.RE +.PP +7 +.RS 4 +Timestamp is not valid\&. +.RE +.SH "NOTES" +.PP +Users can get confused when they are not always asked for passwords when running a given program\&. Some users reflexively begin typing information before noticing that it is not being asked for\&. +.SH "EXAMPLES" +.sp +.if n \{\ +.RS 4 +.\} +.nf +auth sufficient pam_timestamp\&.so verbose +auth required pam_unix\&.so + +session required pam_unix\&.so +session optional pam_timestamp\&.so + +.fi +.if n \{\ +.RE +.\} +.SH "FILES" +.PP +/var/run/sudo/\&.\&.\&. +.RS 4 +timestamp files and directories +.RE +.SH "SEE ALSO" +.PP +\fBpam_timestamp_check\fR(8), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_tally was written by Nalin Dahyabhai\&. diff --git a/modules/pam_timestamp/pam_timestamp_check.8.xml b/modules/pam_timestamp/pam_timestamp_check.8.xml new file mode 100644 index 0000000..06432e0 --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp_check.8.xml @@ -0,0 +1,207 @@ +<?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_timestamp_check"> + + <refmeta> + <refentrytitle>pam_timestamp_check</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_timestamp_check-name"> + <refname>pam_timestamp_check</refname> + <refpurpose>Check to see if the default timestamp is valid</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_timestamp_check-cmdsynopsis"> + <command>pam_timestamp_check</command> + <arg choice="opt"> + -k + </arg> + <arg choice="opt"> + -d + </arg> + <arg choice="opt"> + <replaceable>target_user</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_timestamp_check-description"> + + <title>DESCRIPTION</title> + + <para> + With no arguments <command>pam_timestamp_check</command> will check to +see if the default timestamp is valid, or optionally remove it. + </para> + </refsect1> + + <refsect1 id="pam_timestamp_check-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>-k</option> + </term> + <listitem> + <para> + Instead of checking the validity of a timestamp, remove it. + This is analogous to sudo's <emphasis>-k</emphasis> option. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>-d</option> + </term> + <listitem> + <para> + Instead of returning validity using an exit status, + loop indefinitely, polling regularly and printing the status on + standard output. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option><replaceable>target_user</replaceable></option> + </term> + <listitem> + <para> + By default <command>pam_timestamp_check</command> checks or removes + timestamps generated by <emphasis>pam_timestamp</emphasis> when + the user authenticates as herself. When the user authenticates as a + different user, the name of the timestamp file changes to + accommodate this. <replaceable>target_user</replaceable> allows + to specify this user name. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_timestamp_check-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>0</term> + <listitem> + <para> + The timestamp is valid. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>2</term> + <listitem> + <para> + The binary is not setuid root. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>3</term> + <listitem> + <para> + Invalid invocation. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>4</term> + <listitem> + <para> + User is unknown. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>5</term> + <listitem> + <para> + Permissions error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>6</term> + <listitem> + <para> + Invalid controlling tty. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>7</term> + <listitem> + <para> + Timestamp is not valid. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_timestamp-notes'> + <title>NOTES</title> + <para> + Users can get confused when they are not always asked for passwords when +running a given program. Some users reflexively begin typing information before +noticing that it is not being asked for. + </para> + </refsect1> + + <refsect1 id='pam_timestamp-examples'> + <title>EXAMPLES</title> + <programlisting> +auth sufficient pam_timestamp.so verbose +auth required pam_unix.so + +session required pam_unix.so +session optional pam_timestamp.so + </programlisting> + </refsect1> + + <refsect1 id="pam_timestamp-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/var/run/sudo/...</filename></term> + <listitem> + <para>timestamp files and directories</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_timestamp-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_timestamp_check</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <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_timestamp-author'> + <title>AUTHOR</title> + <para> + pam_tally was written by Nalin Dahyabhai. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_timestamp/pam_timestamp_check.c b/modules/pam_timestamp/pam_timestamp_check.c new file mode 100644 index 0000000..52b5a95 --- /dev/null +++ b/modules/pam_timestamp/pam_timestamp_check.c @@ -0,0 +1,42 @@ +/****************************************************************************** + * A module for Linux-PAM that will cache authentication results, inspired by + * (and implemented with an eye toward being mixable with) sudo. + * + * Copyright (c) 2002 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * 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. + * + */ + +#define PAM_TIMESTAMP_MAIN 1 +#include "pam_timestamp.c" diff --git a/modules/pam_timestamp/sha1.c b/modules/pam_timestamp/sha1.c new file mode 100644 index 0000000..576b4b4 --- /dev/null +++ b/modules/pam_timestamp/sha1.c @@ -0,0 +1,254 @@ +/* Yet another SHA-1 implementation. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * 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. + * + */ +/* See http://www.itl.nist.gov/fipspubs/fip180-1.htm for descriptions. */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <netinet/in.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <endian.h> +#include <unistd.h> +#include "sha1.h" + +static unsigned char +padding[SHA1_BLOCK_SIZE] = { + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, +}; + +static u_int32_t +F(u_int32_t b, u_int32_t c, u_int32_t d) +{ + return (b & c) | ((~b) & d); +} + +static u_int32_t +G(u_int32_t b, u_int32_t c, u_int32_t d) +{ + return b ^ c ^ d; +} + +static u_int32_t +H(u_int32_t b, u_int32_t c, u_int32_t d) +{ + return (b & c) | (b & d) | (c & d); +} + +static u_int32_t +RL(u_int32_t n, u_int32_t s) +{ + return (n << s) | (n >> (32 - s)); +} + +static u_int32_t +sha1_round(u_int32_t (*FUNC)(u_int32_t, u_int32_t, u_int32_t), + u_int32_t a, u_int32_t b, u_int32_t c, u_int32_t d, u_int32_t e, + u_int32_t i, u_int32_t n) +{ + return RL(a, 5) + FUNC(b, c, d) + e + i + n; +} + +void +sha1_init(struct sha1_context *ctx) +{ + memset(ctx, 0, sizeof(*ctx)); + ctx->a = 0x67452301; + ctx->b = 0xefcdab89; + ctx->c = 0x98badcfe; + ctx->d = 0x10325476; + ctx->e = 0xc3d2e1f0; +} + +static void +sha1_process(struct sha1_context *ctx, u_int32_t buffer[SHA1_BLOCK_SIZE / 4]) +{ + u_int32_t a, b, c, d, e, temp; + u_int32_t data[80]; + int i; + + for (i = 0; i < 16; i++) { + data[i] = htonl(buffer[i]); + } + for (i = 16; i < 80; i++) { + data[i] = RL(data[i - 3] ^ data[i - 8] ^ data[i - 14] ^ data[i - 16], 1); + } + + a = ctx->a; + b = ctx->b; + c = ctx->c; + d = ctx->d; + e = ctx->e; + + for (i = 0; i < 20; i++) { + temp = sha1_round(F, a, b, c, d, e, data[i], 0x5a827999); + e = d; d = c; c = RL(b, 30); b = a; a = temp; + } + for (i = 20; i < 40; i++) { + temp = sha1_round(G, a, b, c, d, e, data[i], 0x6ed9eba1); + e = d; d = c; c = RL(b, 30); b = a; a = temp; + } + for (i = 40; i < 60; i++) { + temp = sha1_round(H, a, b, c, d, e, data[i], 0x8f1bbcdc); + e = d; d = c; c = RL(b, 30); b = a; a = temp; + } + for (i = 60; i < 80; i++) { + temp = sha1_round(G, a, b, c, d, e, data[i], 0xca62c1d6); + e = d; d = c; c = RL(b, 30); b = a; a = temp; + } + + ctx->a += a; + ctx->b += b; + ctx->c += c; + ctx->d += d; + ctx->e += e; + + memset(buffer, 0, sizeof(buffer[0]) * SHA1_BLOCK_SIZE / 4); + memset(data, 0, sizeof(data)); +} + +void +sha1_update(struct sha1_context *ctx, const unsigned char *data, size_t length) +{ + size_t i = 0, l = length, c, t; + u_int32_t count = 0; + + /* Process any pending + data blocks. */ + while (l + ctx->pending_count >= SHA1_BLOCK_SIZE) { + c = ctx->pending_count; + t = SHA1_BLOCK_SIZE - c; + memcpy(ctx->pending + c, &data[i], t); + sha1_process(ctx, (u_int32_t*) ctx->pending); + i += t; + l -= t; + ctx->pending_count = 0; + } + + /* Save what's left of the data block as a pending data block. */ + c = ctx->pending_count; + memcpy(ctx->pending + c, &data[i], l); + ctx->pending_count += l; + + /* Update the message length. */ + ctx->count += length; + + /* Update our internal counts. */ + if (length != 0) { + count = ctx->counts[0]; + ctx->counts[0] += length; + if (count >= ctx->counts[0]) { + ctx->counts[1]++; + } + } +} + +size_t +sha1_output(struct sha1_context *ctx, unsigned char *out) +{ + struct sha1_context ctx2; + + /* Output the sum. */ + if (out != NULL) { + u_int32_t c; + memcpy(&ctx2, ctx, sizeof(ctx2)); + + /* Pad this block. */ + c = ctx2.pending_count; + memcpy(ctx2.pending + c, + padding, SHA1_BLOCK_SIZE - c); + + /* Do we need to process two blocks now? */ + if (c >= (SHA1_BLOCK_SIZE - (sizeof(u_int32_t) * 2))) { + /* Process this block. */ + sha1_process(&ctx2, + (u_int32_t*) ctx2.pending); + /* Set up another block. */ + ctx2.pending_count = 0; + memset(ctx2.pending, 0, SHA1_BLOCK_SIZE); + ctx2.pending[0] = + (c == SHA1_BLOCK_SIZE) ? 0x80 : 0; + } + + /* Process the final block. */ + ctx2.counts[1] <<= 3; + if (ctx2.counts[0] >> 29) { + ctx2.counts[1] |= + (ctx2.counts[0] >> 29); + } + ctx2.counts[0] <<= 3; + ctx2.counts[0] = htonl(ctx2.counts[0]); + ctx2.counts[1] = htonl(ctx2.counts[1]); + memcpy(ctx2.pending + 56, + &ctx2.counts[1], sizeof(u_int32_t)); + memcpy(ctx2.pending + 60, + &ctx2.counts[0], sizeof(u_int32_t)); + sha1_process(&ctx2, (u_int32_t*) ctx2.pending); + + /* Output the data. */ + out[ 3] = (ctx2.a >> 0) & 0xff; + out[ 2] = (ctx2.a >> 8) & 0xff; + out[ 1] = (ctx2.a >> 16) & 0xff; + out[ 0] = (ctx2.a >> 24) & 0xff; + + out[ 7] = (ctx2.b >> 0) & 0xff; + out[ 6] = (ctx2.b >> 8) & 0xff; + out[ 5] = (ctx2.b >> 16) & 0xff; + out[ 4] = (ctx2.b >> 24) & 0xff; + + out[11] = (ctx2.c >> 0) & 0xff; + out[10] = (ctx2.c >> 8) & 0xff; + out[ 9] = (ctx2.c >> 16) & 0xff; + out[ 8] = (ctx2.c >> 24) & 0xff; + + out[15] = (ctx2.d >> 0) & 0xff; + out[14] = (ctx2.d >> 8) & 0xff; + out[13] = (ctx2.d >> 16) & 0xff; + out[12] = (ctx2.d >> 24) & 0xff; + + out[19] = (ctx2.e >> 0) & 0xff; + out[18] = (ctx2.e >> 8) & 0xff; + out[17] = (ctx2.e >> 16) & 0xff; + out[16] = (ctx2.e >> 24) & 0xff; + } + + return SHA1_OUTPUT_SIZE; +} diff --git a/modules/pam_timestamp/sha1.h b/modules/pam_timestamp/sha1.h new file mode 100644 index 0000000..667b87c --- /dev/null +++ b/modules/pam_timestamp/sha1.h @@ -0,0 +1,60 @@ +/* Yet another SHA-1 implementation. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * 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. + * + */ +#ifndef pam_timestamp_sha1_h +#define pam_timestamp_sha1_h + +#include <sys/types.h> + +#define SHA1_BLOCK_SIZE 64 + +struct sha1_context { + size_t count; + unsigned char pending[SHA1_BLOCK_SIZE]; + u_int32_t counts[2]; + size_t pending_count; + u_int32_t a, b, c, d, e; +}; + +#define SHA1_OUTPUT_SIZE 20 + +void sha1_init(struct sha1_context *ctx); +void sha1_update(struct sha1_context *ctx, + const unsigned char *data, size_t length); +size_t sha1_output(struct sha1_context *ctx, unsigned char *out); + +#endif diff --git a/modules/pam_timestamp/tst-pam_timestamp b/modules/pam_timestamp/tst-pam_timestamp new file mode 100755 index 0000000..1d425b8 --- /dev/null +++ b/modules/pam_timestamp/tst-pam_timestamp @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_timestamp.so |