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wget: add a big explanation what TLS code implements and what does not 

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-01-30 16:27:37 +01:00
parent 35b54a3c24
commit 67f6db6b27
2 changed files with 36 additions and 3 deletions
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33
networking/wget.c
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@ -58,6 +58,39 @@
//config: On NOMMU machines, ssl_helper applet should be available
//config: in the $PATH for this to work. Make sure to select that applet.
//config:
//config: Note: currently, TLS code only makes TLS I/O work, it
//config: does *not* check that the peer is who it claims to be, etc.
//config: IOW: it uses peer-supplied public keys to establish encryption
//config: and signing keys, then encrypts and signs outgoing data and
//config: decrypts incoming data.
//config: It does not check signature hashes on the incoming data:
//config: this means that attackers manipulating TCP packets can
//config: send altered data and we unknowingly receive garbage.
//config: (This check might be relatively easy to add).
//config: It does not check public key's certificate:
//config: this means that the peer may be an attacker impersonating
//config: the server we think we are talking to.
//config:
//config: If you think this is unacceptable, consider this. As more and more
//config: servers switch to HTTPS-only operation, without such "crippled"
//config: TLS code it is *impossible* to simply download a kernel source
//config: from kernel.org. Which can in real world translate into
//config: "my small automatic tooling to build cross-compilers from sources
//config: no longer works, I need to additionally keep a local copy
//config: of ~4 megabyte source tarball of a SSL library and ~2 megabyte
//config: source of wget, need to compile and built both before I can
//config: download anything. All this despite the fact that the build
//config: is done in a QEMU sandbox on a machine with absolutely nothing
//config: worth stealing, so I don't care if someone would go to a lot
//config: of trouble to intercept my HTTPS download to send me an altered
//config: kernel tarball".
//config:
//config: If you still think this is unacceptable, send patches.
//config:
//config: If you still think this is unacceptable, do not want to send
//config: patches, but do want to waste bandwidth expaining how wrong
//config: it is, you will be ignored.
//config:
//config:config FEATURE_WGET_OPENSSL
//config: bool "Try to connect to HTTPS using openssl"
//config: default y

6
shell/Config.src
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@ -123,9 +123,9 @@ config FEATURE_SH_STANDALONE
This is implemented by re-execing /proc/self/exe (typically)
with right parameters.
However, there are drawbacks: it is problematic in chroot jails without
mounted /proc, and ps/top may show command name as 'exe' for applets
started this way.
However, there are drawbacks: it is problematic in chroot jails
without mounted /proc, and ps/top may show command name as 'exe'
for applets started this way.
config FEATURE_SH_NOFORK
bool "Run 'nofork' applets directly"