Author: Raphael Geissert Bug-Debian: https://bugs.debian.org/731860 Description: Avoid directory traversal when extracting archives by skipping over leading slashes and any prefix containing ".." components. Forwarded: yes --- a/lib/decode.c +++ b/lib/decode.c @@ -22,6 +22,36 @@ #endif +char * +safer_name_suffix (char const *file_name) +{ + char const *p, *t; + p = t = file_name; + while (*p == '/') t = ++p; + while (*p) + { + while (p[0] == '.' && p[0] == p[1] && p[2] == '/') + { + p += 3; + t = p; + } + /* advance pointer past the next slash */ + while (*p && (p++)[0] != '/'); + } + + if (!*t) + { + t = "."; + } + + if (t != file_name) + { + /* TODO: warn somehow that the path was modified */ + } + return (char*)t; +} + + /* determine full path name */ char * th_get_pathname(TAR *t) @@ -29,17 +59,17 @@ th_get_pathname(TAR *t) static char filename[MAXPATHLEN]; if (t->th_buf.gnu_longname) - return t->th_buf.gnu_longname; + return safer_name_suffix(t->th_buf.gnu_longname); if (t->th_buf.prefix[0] != '\0') { snprintf(filename, sizeof(filename), "%.155s/%.100s", t->th_buf.prefix, t->th_buf.name); - return filename; + return safer_name_suffix(filename); } snprintf(filename, sizeof(filename), "%.100s", t->th_buf.name); - return filename; + return safer_name_suffix(filename); } --- a/lib/extract.c +++ b/lib/extract.c @@ -298,14 +298,14 @@ tar_extract_hardlink(TAR * t, char *real if (mkdirhier(dirname(filename)) == -1) return -1; libtar_hashptr_reset(&hp); - if (libtar_hash_getkey(t->h, &hp, th_get_linkname(t), + if (libtar_hash_getkey(t->h, &hp, safer_name_suffix(th_get_linkname(t)), (libtar_matchfunc_t)libtar_str_match) != 0) { lnp = (char *)libtar_hashptr_data(&hp); linktgt = &lnp[strlen(lnp) + 1]; } else - linktgt = th_get_linkname(t); + linktgt = safer_name_suffix(th_get_linkname(t)); #ifdef DEBUG printf(" ==> extracting: %s (link to %s)\n", filename, linktgt); @@ -343,9 +343,9 @@ tar_extract_symlink(TAR *t, char *realna #ifdef DEBUG printf(" ==> extracting: %s (symlink to %s)\n", - filename, th_get_linkname(t)); + filename, safer_name_suffix(th_get_linkname(t))); #endif - if (symlink(th_get_linkname(t), filename) == -1) + if (symlink(safer_name_suffix(th_get_linkname(t)), filename) == -1) { #ifdef DEBUG perror("symlink()"); --- a/lib/internal.h +++ b/lib/internal.h @@ -15,3 +15,4 @@ #include +char* safer_name_suffix(char const*); --- a/lib/output.c +++ b/lib/output.c @@ -123,9 +123,9 @@ th_print_long_ls(TAR *t) else printf(" link to "); if ((t->options & TAR_GNU) && t->th_buf.gnu_longlink != NULL) - printf("%s", t->th_buf.gnu_longlink); + printf("%s", safer_name_suffix(t->th_buf.gnu_longlink)); else - printf("%.100s", t->th_buf.linkname); + printf("%.100s", safer_name_suffix(t->th_buf.linkname)); } putchar('\n'); ystem/examples/desktop.tmpl?id=491bddfa276cc9775adf325c07e5f82638f330e7'>system: examples: Add mode prop line....* gnu/system/examples/asus-c201.tmpl: Add a mode prop line. * gnu/system/examples/bare-bones.tmpl: Likewise. * gnu/system/examples/beaglebone-black.tmpl: Likewise. * gnu/system/examples/desktop.tmpl: Likewise. * gnu/system/examples/docker-image.tmpl: Likewise. * gnu/system/examples/lightweight-desktop.tmpl: Likewise. * gnu/system/examples/raspberry-pi-64-nfs-root.tmpl: Likewise. * gnu/system/examples/raspberry-pi-64.tmpl: Likewise. * gnu/system/examples/vm-image.tmpl: Likewise. Maxim Cournoyer 2022-01-05doc: Only use GDM and GNOME on x86_64....* gnu/system/examples/desktop.tmpl: Only use gnome-desktop-service-type and the default login manager in set-xorg-configuration when the target system is x86_64. Ricardo Wurmus 2021-12-19doc: Add group configuration example...* gnu/system/examples/desktop.tmpl: Add group configuration example. Signed-off-by: Ludovic Courtès <ludo@gnu.org> Denis 'GNUtoo' Carikli 2021-11-23doc: Add new Swap Space section....* doc/guix.texi (operating-system Reference): Update swap-devices. * doc/guix.texi (Swap Space): Add it. * gnu/system/examples/desktop.tmpl: Add swap-devices example. Signed-off-by: Ludovic Courtès <ludo@gnu.org> Josselin Poiret 2021-08-29Migrate to the new 'targets' field of bootloader-configuration....The old 'target' field is deprecated; adjust the sources to use the new 'targets' one instead. * doc/guix-cookbook.texi<target>: Replace by 'targets'. * gnu/bootloader/grub.scm: Likewise. * gnu/installer/parted.scm: Likewise. * gnu/machine/digital-ocean.scm: Likewise. * gnu/system/examples/asus-c201.tmpl: Likewise * gnu/system/examples/bare-bones.tmpl: Likewise * gnu/system/examples/bare-hurd.tmpl: Likewise * gnu/system/examples/beaglebone-black.tmpl: Likewise * gnu/system/examples/desktop.tmpl: Likewise * gnu/system/examples/docker-image.tmpl: Likewise * gnu/system/examples/lightweight-desktop.tmpl: Likewise * gnu/system/examples/vm-image.tmpl: Likewise * gnu/system/examples/yggdrasil.tmpl: Likewise * gnu/system/hurd.scm: Likewise * gnu/system/images/hurd.scm: Likewise * gnu/system/images/novena.scm: Likewise * gnu/system/images/pine64.scm: Likewise * gnu/system/images/pinebook-pro.scm: Likewise * gnu/system/images/rock64.scm: Likewise * gnu/system/install.scm: Likewise * gnu/system/vm.scm: Likewise * gnu/tests.scm: Likewise * gnu/tests/ganeti.scm: Likewise * gnu/tests/install.scm: Likewise * gnu/tests/nfs.scm: Likewise * gnu/tests/telephony.scm: Likewise * tests/boot-parameters.scm: Likewise * tests/system.scm: Likewise Maxim Cournoyer