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Thomas Wolf b8a514fdcb sshd: correct the protocol version exchange RFC 4253 section 4.2 allows an ssh server to send additional lines before its server identification string. Apache MINA sshd enforces for these lines the constraints specified for the server identification line, too: no NUL characters and not longer than 255 characters. That is too strict. RFC 4253 doesn't mandate this, and it also doesn't make sense given the rationale for these lines in RFC 4253: a TCP wrapper may not be aware of SSH restrictions, and may not adhere to these constraints. Be more lenient when parsing the server's protocol version. Allow NULs and longer lines in the preamble, and also handle line endings more leniently. Only enforce the restrictions for the actual server identification line. Bug: 545939 Change-Id: I75955e9d8a8daef7c04fc0f39539c2ee93514e1c Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>	5 years ago
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MANIFEST.MF	sshd: correct the protocol version exchange	5 years ago

Thomas Wolf b8a514fdcb sshd: correct the protocol version exchange

RFC 4253 section 4.2 allows an ssh server to send additional lines
before its server identification string. Apache MINA sshd enforces
for these lines the constraints specified for the server identification
line, too: no NUL characters and not longer than 255 characters. That
is too strict. RFC 4253 doesn't mandate this, and it also doesn't
make sense given the rationale for these lines in RFC 4253: a TCP
wrapper may not be aware of SSH restrictions, and may not adhere to
these constraints.

Be more lenient when parsing the server's protocol version. Allow
NULs and longer lines in the preamble, and also handle line endings
more leniently. Only enforce the restrictions for the actual server
identification line.

Bug: 545939
Change-Id: I75955e9d8a8daef7c04fc0f39539c2ee93514e1c
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

5 years ago

MANIFEST.MF

sshd: correct the protocol version exchange

5 years ago