From e4baa05c6f73b364843f0ddd5394bf4298aca0d7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20Filipensk=C3=BD?= Date: Tue, 8 Feb 2022 12:07:03 +0100 Subject: [PATCH 1/5] s3:modules: Implement dummy virus scanner that uses filename matching MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bug: https://bugzilla.samba.org/show_bug.cgi?id=14971 Signed-off-by: Pavel Filipenský Reviewed-by: Jeremy Allison Reviewed-by: Andreas Schneider (cherry picked from commit 9f34babec7c6aca3d91f226705d3b3996792e5f1) --- source3/modules/vfs_virusfilter.c | 12 +++++ source3/modules/vfs_virusfilter_common.h | 4 ++ source3/modules/vfs_virusfilter_dummy.c | 58 ++++++++++++++++++++++++ source3/modules/wscript_build | 1 + 4 files changed, 75 insertions(+) create mode 100644 source3/modules/vfs_virusfilter_dummy.c diff --git a/source3/modules/vfs_virusfilter.c b/source3/modules/vfs_virusfilter.c index 524e7dfbad9..5ae8a02a369 100644 --- a/source3/modules/vfs_virusfilter.c +++ b/source3/modules/vfs_virusfilter.c @@ -35,12 +35,14 @@ enum virusfilter_scanner_enum { VIRUSFILTER_SCANNER_CLAMAV, + VIRUSFILTER_SCANNER_DUMMY, VIRUSFILTER_SCANNER_FSAV, VIRUSFILTER_SCANNER_SOPHOS }; static const struct enum_list scanner_list[] = { { VIRUSFILTER_SCANNER_CLAMAV, "clamav" }, + { VIRUSFILTER_SCANNER_DUMMY, "dummy" }, { VIRUSFILTER_SCANNER_FSAV, "fsav" }, { VIRUSFILTER_SCANNER_SOPHOS, "sophos" }, { -1, NULL } @@ -199,6 +201,7 @@ static int virusfilter_vfs_connect( int snum = SNUM(handle->conn); struct virusfilter_config *config = NULL; const char *exclude_files = NULL; + const char *infected_files = NULL; const char *temp_quarantine_dir_mode = NULL; const char *infected_file_command = NULL; const char *scan_error_command = NULL; @@ -255,6 +258,12 @@ static int virusfilter_vfs_connect( set_namearray(&config->exclude_files, exclude_files); } + infected_files = lp_parm_const_string( + snum, "virusfilter", "infected files", NULL); + if (infected_files != NULL) { + set_namearray(&config->infected_files, infected_files); + } + config->cache_entry_limit = lp_parm_int( snum, "virusfilter", "cache entry limit", 100); @@ -532,6 +541,9 @@ static int virusfilter_vfs_connect( case VIRUSFILTER_SCANNER_CLAMAV: ret = virusfilter_clamav_init(config); break; + case VIRUSFILTER_SCANNER_DUMMY: + ret = virusfilter_dummy_init(config); + break; default: DBG_ERR("Unhandled scanner %d\n", backend); return -1; diff --git a/source3/modules/vfs_virusfilter_common.h b/source3/modules/vfs_virusfilter_common.h index f71b0b949a7..463a9d74e9c 100644 --- a/source3/modules/vfs_virusfilter_common.h +++ b/source3/modules/vfs_virusfilter_common.h @@ -83,6 +83,9 @@ struct virusfilter_config { /* Exclude files */ name_compare_entry *exclude_files; + /* Infected files */ + name_compare_entry *infected_files; + /* Scan result cache */ struct virusfilter_cache *cache; int cache_entry_limit; @@ -149,5 +152,6 @@ struct virusfilter_backend { int virusfilter_sophos_init(struct virusfilter_config *config); int virusfilter_fsav_init(struct virusfilter_config *config); int virusfilter_clamav_init(struct virusfilter_config *config); +int virusfilter_dummy_init(struct virusfilter_config *config); #endif /* _VIRUSFILTER_COMMON_H */ diff --git a/source3/modules/vfs_virusfilter_dummy.c b/source3/modules/vfs_virusfilter_dummy.c new file mode 100644 index 00000000000..03405cd6629 --- /dev/null +++ b/source3/modules/vfs_virusfilter_dummy.c @@ -0,0 +1,58 @@ +/* + Samba-VirusFilter VFS modules + Dummy scanner with infected files support. + Copyright (C) 2022 Pavel Filipenský + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +#include "modules/vfs_virusfilter_utils.h" + +static virusfilter_result virusfilter_dummy_scan( + struct vfs_handle_struct *handle, + struct virusfilter_config *config, + const struct files_struct *fsp, + char **reportp) +{ + bool ok; + + DBG_INFO("Scanning file: %s\n", fsp_str_dbg(fsp)); + ok = is_in_path(fsp->fsp_name->base_name, + config->infected_files, + false); + return ok ? VIRUSFILTER_RESULT_INFECTED : VIRUSFILTER_RESULT_CLEAN; +} + +static struct virusfilter_backend_fns virusfilter_backend_dummy = { + .connect = NULL, + .disconnect = NULL, + .scan_init = NULL, + .scan = virusfilter_dummy_scan, + .scan_end = NULL, +}; + +int virusfilter_dummy_init(struct virusfilter_config *config) +{ + struct virusfilter_backend *backend = NULL; + + backend = talloc_zero(config, struct virusfilter_backend); + if (backend == NULL) { + return -1; + } + + backend->fns = &virusfilter_backend_dummy; + backend->name = "dummy"; + config->backend = backend; + return 0; +} diff --git a/source3/modules/wscript_build b/source3/modules/wscript_build index 36b047ef79b..444a16f2cc0 100644 --- a/source3/modules/wscript_build +++ b/source3/modules/wscript_build @@ -598,6 +598,7 @@ bld.SAMBA3_MODULE('vfs_virusfilter', vfs_virusfilter_sophos.c vfs_virusfilter_fsav.c vfs_virusfilter_clamav.c + vfs_virusfilter_dummy.c ''', deps='samba-util VFS_VIRUSFILTER_UTILS', init_function='', -- 2.34.1 From f3c9a2e7c524b25558550ed7fb1b7778975a3f2b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20Filipensk=C3=BD?= Date: Tue, 8 Feb 2022 22:35:29 +0100 Subject: [PATCH 2/5] docs-xml:manpages: Document 'dummy' virusfilter and 'virusfilter:infected files' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bug: https://bugzilla.samba.org/show_bug.cgi?id=14971 Signed-off-by: Pavel Filipenský Reviewed-by: Jeremy Allison Reviewed-by: Andreas Schneider (cherry picked from commit 2fd518e5cc63221c162c9b3f8526b9b7c9e34969) --- docs-xml/manpages/vfs_virusfilter.8.xml | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs-xml/manpages/vfs_virusfilter.8.xml b/docs-xml/manpages/vfs_virusfilter.8.xml index 329a35af68a..88f91d73a42 100644 --- a/docs-xml/manpages/vfs_virusfilter.8.xml +++ b/docs-xml/manpages/vfs_virusfilter.8.xml @@ -48,6 +48,10 @@ scanner clamav, the ClamAV scanner + dummy, dummy scanner used in + tests. Checks against the infected files + parameter and flags any name that matches as infected. + @@ -264,6 +268,14 @@ + + virusfilter:infected files = empty + + Files that virusfilter dummy flags as infected. + If this option is not set, the default is empty. + + + virusfilter:block access on error = false -- 2.34.1 From 3758a9612862c88a17ed20787b60346859c03eea Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20Filipensk=C3=BD?= Date: Tue, 8 Feb 2022 15:34:56 +0100 Subject: [PATCH 3/5] selftest: Fix trailing whitespace in Samba3.pm MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bug: https://bugzilla.samba.org/show_bug.cgi?id=14971 Signed-off-by: Pavel Filipenský Reviewed-by: Jeremy Allison Reviewed-by: Andreas Schneider (cherry picked from commit 547b4c595a8513a4be99177edbaa39ce43840f7a) --- selftest/target/Samba3.pm | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/selftest/target/Samba3.pm b/selftest/target/Samba3.pm index 9a8c9ee2604..306783931e0 100755 --- a/selftest/target/Samba3.pm +++ b/selftest/target/Samba3.pm @@ -188,7 +188,7 @@ sub getlog_env_app($$$) close(LOG); return "" if $out eq $title; - + return $out; } @@ -2205,7 +2205,7 @@ sub provision($$) my $nmbdsockdir="$prefix_abs/nmbd"; unlink($nmbdsockdir); - ## + ## ## create the test directory layout ## die ("prefix_abs = ''") if $prefix_abs eq ""; @@ -3057,7 +3057,7 @@ sub provision($$) unless (open(PASSWD, ">$nss_wrapper_passwd")) { warn("Unable to open $nss_wrapper_passwd"); return undef; - } + } print PASSWD "nobody:x:$uid_nobody:$gid_nobody:nobody gecos:$prefix_abs:/bin/false $unix_name:x:$unix_uid:$unix_gids[0]:$unix_name gecos:$prefix_abs:/bin/false pdbtest:x:$uid_pdbtest:$gid_nogroup:pdbtest gecos:$prefix_abs:/bin/false -- 2.34.1 From e92fbd282c584cadcd0ed513c414b5377282ed64 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20Filipensk=C3=BD?= Date: Tue, 8 Feb 2022 15:35:48 +0100 Subject: [PATCH 4/5] s3:selftest: Add test for virus scanner MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bug: https://bugzilla.samba.org/show_bug.cgi?id=14971 Signed-off-by: Pavel Filipenský Pair-Programmed-With: Andreas Schneider Reviewed-by: Jeremy Allison Reviewed-by: Andreas Schneider (cherry picked from commit a25c714c34d3e00e0f3c29d2acfa98cf9cdbc544) --- selftest/knownfail.d/virus_scanner | 2 + selftest/target/Samba3.pm | 12 ++ source3/script/tests/test_virus_scanner.sh | 124 +++++++++++++++++++++ source3/selftest/tests.py | 9 ++ 4 files changed, 147 insertions(+) create mode 100644 selftest/knownfail.d/virus_scanner create mode 100755 source3/script/tests/test_virus_scanner.sh diff --git a/selftest/knownfail.d/virus_scanner b/selftest/knownfail.d/virus_scanner new file mode 100644 index 00000000000..6df3fd20627 --- /dev/null +++ b/selftest/knownfail.d/virus_scanner @@ -0,0 +1,2 @@ +^samba3.blackbox.virus_scanner.check_infected_read # test download infected file ('vfs objects = virusfilter') +^samba3.blackbox.virus_scanner.check_infected_write # test upload infected file ('vfs objects = virusfilter') diff --git a/selftest/target/Samba3.pm b/selftest/target/Samba3.pm index 306783931e0..baec3347c7d 100755 --- a/selftest/target/Samba3.pm +++ b/selftest/target/Samba3.pm @@ -1463,6 +1463,9 @@ sub setup_fileserver my $veto_sharedir="$share_dir/veto"; push(@dirs,$veto_sharedir); + my $virusfilter_sharedir="$share_dir/virusfilter"; + push(@dirs,$virusfilter_sharedir); + my $ip4 = Samba::get_ipv4_addr("FILESERVER"); my $fileserver_options = " kernel change notify = yes @@ -1588,6 +1591,15 @@ sub setup_fileserver path = $veto_sharedir delete veto files = yes +[virusfilter] + path = $virusfilter_sharedir + vfs objects = acl_xattr virusfilter + virusfilter:scanner = dummy + virusfilter:min file size = 0 + virusfilter:infected files = *infected* + virusfilter:infected file action = rename + virusfilter:scan on close = yes + [homes] comment = Home directories browseable = No diff --git a/source3/script/tests/test_virus_scanner.sh b/source3/script/tests/test_virus_scanner.sh new file mode 100755 index 00000000000..2234ea6ca89 --- /dev/null +++ b/source3/script/tests/test_virus_scanner.sh @@ -0,0 +1,124 @@ +#!/bin/sh +# Copyright (c) 2022 Pavel Filipenský +# shellcheck disable=1091 + +if [ $# -lt 4 ]; then +cat <fsp_flags.modified + if ! echo "Hello Virus!" > "${sharedir}/infected.txt"; then + echo "ERROR: Cannot create ${sharedir}/infected.txt" + return 1 + fi + + ${SMBCLIENT} "//${SERVER_IP}/${SHARE}" -U"${USER}"%"${PASSWORD}" -c "put ${sharedir}/infected.txt ${smbfile}" + + # check that virusfilter:rename prefix/suffix was added + if [ ! -f "${sharedir}/${smbfilerenamed}" ]; then + echo "ERROR: ${sharedir}/${smbfilerenamed} is missing." + return 1 + fi + + # check that file was not uploaded + if [ -f "${sharedir}/infected.upload.txt" ]; then + echo "ERROR: {sharedir}/${smbfile} should not exist." + return 1 + fi + + return 0 +} + +check_healthy_read() +{ + rm -rf "${sharedir:?}"/* + + if ! echo "Hello Samba!" > "${sharedir}/healthy.txt"; then + echo "ERROR: Cannot create ${sharedir}/healthy.txt" + return 1 + fi + + ${SMBCLIENT} //"${SERVER_IP}"/"${SHARE}" -U"${USER}"%"${PASSWORD}" -c "get healthy.txt ${sharedir}/healthy.download.txt" + + if ! cmp "${sharedir}/healthy.txt" "${sharedir}/healthy.download.txt"; then + echo "ERROR: cmp ${sharedir}/healthy.txt ${sharedir}/healthy.download.txt FAILED" + return 1 + fi + + return 0 +} + +check_healthy_write() +{ + rm -rf "${sharedir:?}"/* + + if ! echo "Hello Samba!" > "${sharedir}/healthy.txt"; then + echo "ERROR: Cannot create ${sharedir}/healthy.txt" + return 1 + fi + + ${SMBCLIENT} //"${SERVER_IP}"/"${SHARE}" -U"${USER}"%"${PASSWORD}" -c "put ${sharedir}/healthy.txt healthy.upload.txt" + + if ! cmp "${sharedir}/healthy.txt" "${sharedir}/healthy.upload.txt"; then + echo "ERROR: cmp ${sharedir}/healthy.txt ${sharedir}/healthy.upload.txt FAILED" + return 1 + fi + + return 0 +} + +testit "check_infected_read" check_infected_read || failed=$((failed + 1)) +testit "check_infected_write" check_infected_write || failed=$((failed + 1)) +testit "check_healthy_read" check_healthy_read || failed=$((failed + 1)) +testit "check_healthy_write" check_healthy_write || failed=$((failed + 1)) + +testok "$0" "$failed" diff --git a/source3/selftest/tests.py b/source3/selftest/tests.py index c78c9ea4ab8..3c8976874e6 100755 --- a/source3/selftest/tests.py +++ b/source3/selftest/tests.py @@ -1113,6 +1113,15 @@ plantestsuite("samba3.blackbox.smbclient.encryption_off", "simpleserver", "$USERNAME", "$PASSWORD", "$SERVER", smbclient3]) +env = 'fileserver' +plantestsuite("samba3.blackbox.virus_scanner", "%s:local" % (env), + [os.path.join(samba3srcdir, + "script/tests/test_virus_scanner.sh"), + '$SERVER_IP', + "virusfilter", + '$LOCAL_PATH', + smbclient3]) + for env in ['fileserver', 'simpleserver']: plantestsuite("samba3.blackbox.smbclient.encryption", env, [os.path.join(samba3srcdir, "script/tests/test_smbclient_encryption.sh"), -- 2.34.1 From 3e1a57b6d8528d7aa4c46b8ac76bff034523b273 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pavel=20Filipensk=C3=BD?= Date: Mon, 7 Feb 2022 23:06:10 +0100 Subject: [PATCH 5/5] s3:modules: Fix virusfilter_vfs_openat MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bug: https://bugzilla.samba.org/show_bug.cgi?id=14971 Signed-off-by: Pavel Filipenský Pair-Programmed-With: Andreas Schneider Reviewed-by: Jeremy Allison Reviewed-by: Andreas Schneider Autobuild-User(master): Jeremy Allison Autobuild-Date(master): Thu Feb 10 22:09:06 UTC 2022 on sn-devel-184 (cherry picked from commit 3f1c958f6fa9d2991185f4e281a377a295d09f9c) --- selftest/knownfail.d/virus_scanner | 2 -- source3/modules/vfs_virusfilter.c | 6 +++--- 2 files changed, 3 insertions(+), 5 deletions(-) delete mode 100644 selftest/knownfail.d/virus_scanner diff --git a/selftest/knownfail.d/virus_scanner b/selftest/knownfail.d/virus_scanner deleted file mode 100644 index 6df3fd20627..00000000000 --- a/selftest/knownfail.d/virus_scanner +++ /dev/null @@ -1,2 +0,0 @@ -^samba3.blackbox.virus_scanner.check_infected_read # test download infected file ('vfs objects = virusfilter') -^samba3.blackbox.virus_scanner.check_infected_write # test upload infected file ('vfs objects = virusfilter') diff --git a/source3/modules/vfs_virusfilter.c b/source3/modules/vfs_virusfilter.c index 5ae8a02a369..8c7e5323341 100644 --- a/source3/modules/vfs_virusfilter.c +++ b/source3/modules/vfs_virusfilter.c @@ -1304,21 +1304,21 @@ static int virusfilter_vfs_openat(struct vfs_handle_struct *handle, */ goto virusfilter_vfs_open_next; } - ret = S_ISREG(smb_fname->st.st_ex_mode); + ret = S_ISREG(sbuf.st_ex_mode); if (ret == 0) { DBG_INFO("Not scanned: Directory or special file: %s/%s\n", cwd_fname, fname); goto virusfilter_vfs_open_next; } if (config->max_file_size > 0 && - smb_fname->st.st_ex_size > config->max_file_size) + sbuf.st_ex_size > config->max_file_size) { DBG_INFO("Not scanned: file size > max file size: %s/%s\n", cwd_fname, fname); goto virusfilter_vfs_open_next; } if (config->min_file_size > 0 && - smb_fname->st.st_ex_size < config->min_file_size) + sbuf.st_ex_size < config->min_file_size) { DBG_INFO("Not scanned: file size < min file size: %s/%s\n", cwd_fname, fname); -- 2.34.1