From 61539efc2bc4ba9a9faceaced12660d588c1be7a Mon Sep 17 00:00:00 2001 From: Daniel Kahn Gillmor Date: Fri, 5 Aug 2016 10:46:43 -0400 Subject: [PATCH] gpg: Avoid publishing the GnuPG version by default * g10/gpg.c (main): initialize opt.emit_version to 0 * doc/gpg.texi: document different default for --emit-version -- The version of GnuPG in use is not particularly helpful. It is not cryptographically verifiable, and it doesn't distinguish between significant version differences like 2.0.x and 2.1.x. Additionally, it leaks metadata that can be used to distinguish users from one another, and can potentially be used to target specific attacks if there are known behaviors that differ between major versions. It's probably better to take the more parsimonious approach to metadata production by default. (backport of master commit c9387e41db7520d176edd3d6613b85875bdeb32c) Signed-off-by: Daniel Kahn Gillmor --- doc/gpg.texi | 4 ++-- g10/gpg.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/doc/gpg.texi b/doc/gpg.texi index a41ab8e0c..12a6d60d5 100644 --- a/doc/gpg.texi +++ b/doc/gpg.texi @@ -2338,9 +2338,9 @@ protected by the signature. @opindex emit-version Force inclusion of the version string in ASCII armored output. If given once only the name of the program and the major number is -emitted (default), given twice the minor is also emitted, given triple +emitted, given twice the minor is also emitted, given triple the micro is added, and given quad an operating system identification -is also emitted. @option{--no-emit-version} disables the version +is also emitted. @option{--no-emit-version} (default) disables the version line. @item --sig-notation @code{name=value} diff --git a/g10/gpg.c b/g10/gpg.c index 72d313b49..236ea1e66 100644 --- a/g10/gpg.c +++ b/g10/gpg.c @@ -1911,7 +1911,7 @@ main (int argc, char **argv ) opt.def_cert_expire="0"; set_homedir ( default_homedir () ); opt.passwd_repeat=1; - opt.emit_version = 1; /* Limit to the major number. */ + opt.emit_version = 0; #ifdef ENABLE_CARD_SUPPORT #if defined(_WIN32) || defined(__CYGWIN__)