From b920a38dc0a87f5884444d4731a8b887b5e16018 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Mon, 24 Jul 2017 17:20:13 +0200 Subject: tar: postpone creation of symlinks with "suspicious" targets. Closes 8411 function old new delta data_extract_all 968 1038 +70 tar_main 952 986 +34 scan_tree 258 262 +4 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 108/0) Total: 108 bytes Signed-off-by: Denys Vlasenko --- testsuite/tar.tests | 65 ++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 54 insertions(+), 11 deletions(-) (limited to 'testsuite/tar.tests') diff --git a/testsuite/tar.tests b/testsuite/tar.tests index 9f7ce1587..1675b07b1 100755 --- a/testsuite/tar.tests +++ b/testsuite/tar.tests @@ -10,9 +10,6 @@ unset LC_COLLATE unset LC_ALL umask 022 -rm -rf tar.tempdir 2>/dev/null -mkdir tar.tempdir && cd tar.tempdir || exit 1 - # testing "test name" "script" "expected result" "file input" "stdin" testing "Empty file is not a tarball" '\ @@ -53,6 +50,7 @@ dd if=/dev/zero bs=512 count=20 2>/dev/null | tar xvf - 2>&1; echo $? "" "" SKIP= +mkdir tar.tempdir && cd tar.tempdir || exit 1 # "tar cf test.tar input input_dir/ input_hard1 input_hard2 input_hard1 input_dir/ input": # GNU tar 1.26 records as hardlinks: # input_hard2 -> input_hard1 @@ -64,7 +62,6 @@ SKIP= # We also don't use "hrw-r--r--" notation for hardlinks in "tar tv" listing. optional FEATURE_TAR_CREATE FEATURE_LS_SORTFILES testing "tar hardlinks and repeated files" '\ -rm -rf input_* test.tar 2>/dev/null >input_hard1 ln input_hard1 input_hard2 mkdir input_dir @@ -95,10 +92,11 @@ drwxr-xr-x input_dir " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 optional FEATURE_TAR_CREATE FEATURE_LS_SORTFILES testing "tar hardlinks mode" '\ -rm -rf input_* test.tar 2>/dev/null >input_hard1 chmod 741 input_hard1 ln input_hard1 input_hard2 @@ -128,10 +126,11 @@ Ok: 0 " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 optional FEATURE_TAR_CREATE FEATURE_LS_SORTFILES testing "tar symlinks mode" '\ -rm -rf input_* test.tar 2>/dev/null >input_file chmod 741 input_file ln -s input_file input_soft @@ -159,10 +158,11 @@ lrwxrwxrwx input_file " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 optional FEATURE_TAR_CREATE FEATURE_TAR_LONG_OPTIONS testing "tar --overwrite" "\ -rm -rf input_* test.tar 2>/dev/null ln input input_hard tar cf test.tar input_hard echo WRONG >input @@ -174,12 +174,13 @@ Ok " \ "Ok\n" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 test x"$SKIP_KNOWN_BUGS" = x"" && { # Needs to be run under non-root for meaningful test optional FEATURE_TAR_CREATE testing "tar writing into read-only dir" '\ -rm -rf input_* test.tar 2>/dev/null mkdir input_dir >input_dir/input_file chmod 550 input_dir @@ -201,7 +202,9 @@ dr-xr-x--- input_dir "" "" SKIP= } +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 # Had a bug where on extract autodetect first "switched off" -z # and then failed to recognize .tgz extension optional FEATURE_TAR_CREATE FEATURE_SEAMLESS_GZ GUNZIP @@ -217,7 +220,9 @@ Ok " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 # Do we detect XZ-compressed data (even w/o .tar.xz or txz extension)? # (the uuencoded hello_world.txz contains one empty file named "hello_world") optional UUDECODE FEATURE_TAR_AUTODETECT FEATURE_SEAMLESS_XZ @@ -236,7 +241,9 @@ AAAEWVo= ==== " SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 # On extract, everything up to and including last ".." component is stripped optional FEATURE_TAR_CREATE testing "tar strips /../ on extract" "\ @@ -255,7 +262,9 @@ Ok " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 # attack.tar.bz2 has symlink pointing to a system file # followed by a regular file with the same name # containing "root::0:0::/root:/bin/sh": @@ -270,6 +279,7 @@ optional UUDECODE FEATURE_TAR_AUTODETECT FEATURE_SEAMLESS_BZ2 testing "tar does not extract into symlinks" "\ >>/tmp/passwd && uudecode -o input && tar xf input 2>&1 && rm passwd; cat /tmp/passwd; echo \$? " "\ +tar: can't create symlink 'passwd' to '/tmp/passwd' 0 " \ "" "\ @@ -281,12 +291,15 @@ l4/V8LDoe90yiWJhOJvIypgEfxdyRThQkBVn/bI= ==== " SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null + +mkdir tar.tempdir && cd tar.tempdir || exit 1 # And same with -k optional UUDECODE FEATURE_TAR_AUTODETECT FEATURE_SEAMLESS_BZ2 testing "tar -k does not extract into symlinks" "\ >>/tmp/passwd && uudecode -o input && tar xf input -k 2>&1 && rm passwd; cat /tmp/passwd; echo \$? " "\ -tar: can't open 'passwd': File exists +tar: can't create symlink 'passwd' to '/tmp/passwd' 0 " \ "" "\ @@ -298,7 +311,9 @@ l4/V8LDoe90yiWJhOJvIypgEfxdyRThQkBVn/bI= ==== " SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null +mkdir tar.tempdir && cd tar.tempdir || exit 1 optional UNICODE_SUPPORT FEATURE_TAR_GNU_EXTENSIONS FEATURE_SEAMLESS_BZ2 FEATURE_TAR_AUTODETECT testing "Pax-encoded UTF8 names and symlinks" '\ tar xvf ../tar.utf8.tar.bz2 2>&1; echo $? @@ -318,8 +333,36 @@ etc/ssl/certs/f80cc7f6.0 -> EBG_Elektronik_Sertifika_Hizmet_Sağlayıcısı.pem " \ "" "" SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null - -cd .. && rm -rf tar.tempdir || exit 1 +mkdir tar.tempdir && cd tar.tempdir || exit 1 +optional FEATURE_SEAMLESS_BZ2 FEATURE_TAR_AUTODETECT +testing "Symlink attack: create symlink and then write through it" '\ +exec 2>&1 +uudecode -o input && tar xvf input; echo $? +ls /tmp/bb_test_evilfile +ls bb_test_evilfile +ls symlink/bb_test_evilfile +' "\ +anything.txt +symlink +symlink/bb_test_evilfile +tar: can't create symlink 'symlink' to '/tmp' +1 +ls: /tmp/bb_test_evilfile: No such file or directory +ls: bb_test_evilfile: No such file or directory +symlink/bb_test_evilfile +" \ +"" "\ +begin-base64 644 tar_symlink_attack.tar.bz2 +QlpoOTFBWSZTWZgs7bQAALT/hMmQAFBAAf+AEMAGJPPv32AAAIAIMAC5thlR +omAjAmCMADQT1BqNE0AEwAAjAEwElTKeo9NTR6h6gaeoA0DQNLVdwZZ5iNTk +AQwCAV6S00QFJYhrlfFkVCEDEGtgNVqYrI0uK3ggnt30gqk4e1TTQm5QIAKa +SJqzRGSFLMmOloHSAcvLiFxxRiQtQZF+qPxbo173ZDISOAoNoPN4PQPhBhKS +n8fYaKlioCTzL2oXYczyUUIP4u5IpwoSEwWdtoA= +==== +" +SKIP= +cd .. || exit 1; rm -rf tar.tempdir 2>/dev/null exit $FAILCOUNT -- cgit v1.2.3