This moves and isolates the tar code to tar.c. And the actual
file extraction to disk is moved to extract.c.
A new API is introduced and used for v2 file extraction. This
essentially moves and isolates the apk_sign_ctx_* beast into
extract_v2.c and offers a saner interface to handling packages.
A place holder is added for v3 extraction.
Various parsing of numeric strings were not having adequate range
checking causing information leak or potential crash.
CVE-2021-36159
fixes#10749
Co-authored-by: Ariadne Conill <ariadne@dereferenced.org>
Reported-by: Samanta Navarro <ferivoz@riseup.net>
Packages containing files with path names longer than 1024 characters
cannot fit into the buffer which is used to write "installed" database.
This leads to bbuf being APK_BLOB_NULL in apk_db_write_fdb because
apk_blob_push_blob notices the condition and correctly handles it.
The problem occurs when arguments to apk_ostream_write are manually
calculated by pointer arithmetics. Since bbuf.ptr is NULL in such a
case, bbuf.ptr - buf leads to a huge size value while buf still points
into the stack.
fixes#10751
[TT: minor edit to commit and abbreviating the commit message]
If a signature is longer than max allowed adb signature length
then adb_walk_block writes out of boundary of stack variable tmp.
The len += snprintf is not safe per standard snprintf implementation
(kernel does it differently). Introduce and use apk_blob_push_fmt
which does the checking better.
Fixes#10752
Reported-by: Samanta Navarro <ferivoz@riseup.net>
Add uvol_name to struct apk_file_info so it can be passed down
the extract callbacks in future work. Modify uvol name to not
include the path, but just the filename portion.
- apk_istream_splice usage is converted to apk_stream_copy which
is the newer variant. With caching enabled by default, this
makes more sense mmapping or using separate buffers.
- apk_istream_tee is reworked to write to apk_ostream, which simplifies
quite a bit of various things
Fix the script to not contain \x00 escape which was the only new
feature used.
Fix the meson build script to use given lua interpreter for running
the genhelp.lua.
Based on patch from Daniel Golle <daniel@makrotopia.org>
EVP_MD_CTX_set_pkey_ctx() is fairly new openssl function, and not
existing in many alternative. Use EVP_MD_CTX_reset() which is slightly
more heavy but more portable. Add also signature buffer lengths to
work with RSA.
Use of an AUTHORS section is strongly discouraged. Generally, it
is better not to clutter every page with a list of (over time
potentially numerous) authors.
Add your name to comments in sources, or the root level AUTHORS
file instead.
Improves compatibility with libressl, wolfssl and older openssl
libraries not having the flag. Usage of this is optional as it's
purely performance optimization related flag.
Timo Teräs
Ariadne Conill