Apply ACLs and xattrs through a held file descriptor instead of by path, closing
the symlink-race where an attacker swaps the leaf between the transfer and the
metadata set. lib/acl.c provides fd/at POSIX-ACL primitives (the system libacl
*_at where available, else a /proc/self/fd compat that never follows on the
fallback); acls.c routes through them and stays functional (path-based) where the
OS lacks a race-safe primitive; xattrs.c routes copy_xattrs through a held fd; -VV
(usage.c) reports the runtime race-safe-ACL capability.
- Size flist checksum data to hold the active size, not the max.
- Add a negotiated hash method to the daemon auth code.
- Use EVP for all openssl digests. This makes it easy to add more
openssl digest methods and avoids deprecation warnings.
- Support a way to re-enable deprecated digests via openssl conf
file and allow a default file to be configured.
- Supply a simple openssl-rsync.cnf file to enable legacy digests.
- Make the SIMD ASM code off by default. Use configure --enable-simd-asm
to enable.
- Allow MD5 ASM code to be requested even when OpenSSL is handling MD4
checksums. Use configure --enable-md5-asm to enable.
For a non-git build or for a git build w/o adequate git history, we now
allow the git-version.h file to be provided before the build. If the
file does not exist, we either create an empty file or put a define of
RSYNC_GITVER in it based on the output of git describe. The github
builds now snag the git-version.h file that was generated for the last
commit so that they all get the same version string, even with a shallow
checkout.
Andrew Tridgell