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ssh-agent-filter-0.4.1/ 0000775 0000000 0000000 00000000000 12573053174 0014677 5 ustar 00root root 0000000 0000000 ssh-agent-filter-0.4.1/GPL-3 0000664 0000000 0000000 00000104513 12573053174 0015410 0 ustar 00root root 0000000 0000000 GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
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The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
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GNU General Public License for most of our software; it applies also to
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When we speak of free software, we are referring to freedom, not
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TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
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1. Source Code.
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The Corresponding Source need not include anything that users
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The Corresponding Source for a work in source code form is that
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All rights granted under this License are granted for the term of
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long as you offer spare parts or customer support for that product
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7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
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Additional permissions that are applicable to the entire Program shall
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Notwithstanding any other provision of this License, for material you
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8. Termination.
You may not propagate or modify a covered work except as expressly
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this License (including any patent licenses granted under the third
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However, if you cease all violation of this License, then your
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Moreover, your license from a particular copyright holder is
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Termination of your rights under this section does not terminate the
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material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
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10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
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You may not impose any further restrictions on the exercise of the
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11. Patents.
A "contributor" is a copyright holder who authorizes use under this
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work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims
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but do not include claims that would be infringed only as a
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In the following three paragraphs, a "patent license" is any express
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If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
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available, or (2) arrange to deprive yourself of the benefit of the
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consistent with the requirements of this License, to extend the patent
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in a country, would infringe one or more identifiable patents in that
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work and works based on it.
A patent license is "discriminatory" if it does not include within
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conditioned on the non-exercise of one or more of the rights that are
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in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
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parties who would receive the covered work from you, a discriminatory
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conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
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or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
Copyright (C)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
Copyright (C)
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
.
ssh-agent-filter-0.4.1/Makefile 0000664 0000000 0000000 00000003001 12573053174 0016331 0 ustar 00root root 0000000 0000000 # Copyright (C) 2013,2015 Timo Weingärtner
#
# This file is part of ssh-agent-filter.
#
# ssh-agent-filter is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ssh-agent-filter is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with ssh-agent-filter. If not, see .
CXXFLAGS ?= -g -O2 -Wall -Wold-style-cast
CPPFLAGS += -D_FILE_OFFSET_BITS=64
CXXFLAGS += -std=c++11
LDLIBS = -lstdc++ -lboost_program_options -lboost_filesystem -lboost_system -lboost_iostreams -lnettle -lpthread
all: ssh-agent-filter.1 afssh.1 ssh-askpass-noinput.1
%.1: %.1.md
pandoc -s -w man $< -o $@
ssh-agent-filter.1: ssh-agent-filter
help2man -n $< -o $@ -N ./$<
ssh-agent-filter: ssh-agent-filter.o
ssh-agent-filter.o: ssh-agent-filter.C rfc4251.H ssh-agent.h version.h
rfc4251.o: rfc4251.C rfc4251.H
rfc4251_gmp.o: rfc4251_gmp.C rfc4251.H
version.h:
test ! -d .git || git describe | sed 's/^.*$$/#define SSH_AGENT_FILTER_VERSION "ssh-agent-filter \0"/' > $@
clean:
$(RM) *.1 ssh-agent-filter *.o
test ! -d .git || git checkout -f -- version.h
.PHONY: version.h
ssh-agent-filter-0.4.1/README.md 0000664 0000000 0000000 00000004654 12573053174 0016167 0 ustar 00root root 0000000 0000000 ssh-agent-filter
================
the problem we want to solve
----------------------------
ssh(1) describes the problem:
> Agent forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the agent's UNIX-domain socket) can access the local agent through the forwarded connection. An attacker cannot obtain key material from the agent, however they can perform operations on the keys that enable them to authenticate using the identities loaded into the agent.
our solution
------------
1. create one key(pair) for each realm you connect to
2. load keys into your `ssh-agent` as usual
3. use `ssh-agent-filter` to allow only the key(s) you need
`afssh` (agent filtered ssh) can wrap `ssh-agent-filter` and `ssh` for you, forwarding only the key with the comment `id_example`:
$ afssh --comment id_example -- example.com
starts an `ssh-agent-filter --comment id_example`, runs `ssh -A example.com` and kills the `ssh-agent-filter` afterwards.
If you leave out the options before the `--`:
$ afssh -- example.com
it will ask you via `whiptail` or `dialog` which keys you want to have forwarded.
confirmation
------------
You can use the `--*-confirmed` options (e.g.`--comment-confirmed`) to add keys for which you want to be asked on each use through the filter.
The confirmation is done in the same way as when you `ssh-add -c` a key to your `ssh-agent`, but the question will contain some additional information extracted from the sign request.
how it works
------------
ssh-agent-filter provides a socket interface identical to that of a normal ssh-agent.
We don't keep private key material, but delegate requests to the upstream ssh-agent after checking if the key is allowed.
The following requests are implemented:
* `SSH2_AGENTC_REQUEST_IDENTITIES`:
* asks for a list of SSH 2 keys
* the upstream ssh-agent is asked for that list and the result is filtered
* `SSH2_AGENTC_SIGN_REQUEST`:
* asks for a signature on some data to be made with a key
* if the key is allowed the request is forwarded to the upstream ssh-agent and the result returned
* else failure is returned
* `SSH_AGENTC_REQUEST_RSA_IDENTITIES`:
* asks for a list of SSH 1 keys
* an empty list is returned
* `SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES`:
* asks for removal of all SSH 1 keys
* success is returned without doing anything
Requests to add or remove keys and to (un)lock the agent are refused
ssh-agent-filter-0.4.1/afssh 0000775 0000000 0000000 00000004732 12573053174 0015737 0 ustar 00root root 0000000 0000000 #!/bin/bash
# afssh -- wrapper around ssh-agent-filter and ssh
#
# Copyright (C) 2013 Timo Weingärtner
#
# This file is part of ssh-agent-filter.
#
# ssh-agent-filter is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ssh-agent-filter is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with ssh-agent-filter. If not, see .
set -e
usage () {
echo "normal usage: afssh [ssh-agent-filter options] -- [ssh arguments]"
echo "interactive: afssh -- [ssh arguments]"
echo
"$SAF" --help
echo
ssh --help
exit
}
interactive_selection () {
ssh-add -l | {
declare -a arr
while read size hash comment; do
arr+=("$hash" "$comment" "off")
done
"$DIALOG" --separate-output --title "afssh: key selection" --checklist "Which keys do you want to be forwarded?" 0 0 0 "${arr[@]}" 3>&1 1>&2 2>&3 3>&- | while read hash; do
printf '%s\n%s\n' "-f" "$hash"
done
}
}
if ! ssh-add -l > /dev/null; then
echo "no keys in your ssh-agent or ssh-agent not running" >&2
exit 1
fi
declare -a agent_filter_args
if [ -x "${BASH_SOURCE%/*}/ssh-agent-filter" ]; then
SAF=$(readlink -f "${BASH_SOURCE%/*}/ssh-agent-filter")
else
SAF=$(which ssh-agent-filter)
fi
if [ $# -le 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
usage
elif [ "$1" = "--" ]; then
shift
if ! DIALOG=$(which whiptail) && ! DIALOG=$(which dialog); then
echo "neither whiptail nor dialog found in \$PATH, interactive mode doesn't work without one of them" >&2
exit 1
fi
agent_filter_args=( $(interactive_selection) )
else
while true; do
if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
usage
elif [ "$1" = "--" ]; then
shift
break
else
agent_filter_args+=("$1")
shift
fi
done
fi
# safeguard to not kill the real ssh-agent
unset SSH_AGENT_PID
trap 'kill "$SSH_AGENT_PID"; rm -r "$TEMPDIR"' EXIT
TEMPDIR=$(mktemp -d)
if [ -t 1 ]; then
eval $(cd "$TEMPDIR"; "$SAF" "${agent_filter_args[@]}" || echo exit $?)
ssh-add -l
else
eval $(cd "$TEMPDIR"; "$SAF" "${agent_filter_args[@]}" || echo exit $?) > /dev/null
fi
ssh -A "$@"
ssh-agent-filter-0.4.1/afssh.1.md 0000664 0000000 0000000 00000002203 12573053174 0016461 0 ustar 00root root 0000000 0000000 % AFSSH(1)
% Timo Weingärtner
% 2013-07-01
# NAME
afssh - wrapper around ssh-agent-filter and ssh
# SYNOPSIS
*afssh* [*ssh-agent-filter options*] -- [*ssh arguments*]
*afssh* -- [*ssh arguments*]
# DESCRIPTION
afssh (agent filtered ssh) start ssh-agent-filter(1), passing it the arguments given to afssh before the separator `--`.
If there are no arguments before `--`, whiptail(1) or dialog(1) is used to ask the user which keys to forward.
After setting up the ssh-agent-filter(1) ssh(1) is started with `-A` and the rest of the arguments (after `--`).
When ssh(1) exits, the ssh-agent-filter(1) is killed to not leave tons of them idling.
# OPTIONS
-h, \--help
: prints a short usage description, then runs ssh-agent-filter(1) with `--help` and ssh(1) with `--help`
\--
: mandatory separator between the options passed to ssh-agent-filter(1) and those passed to ssh(1)
# RETURN VALUES
Returns the return value of ssh(1) unless setting up the ssh-agent-filter failed, in which case the return value might be any non-zero value.
# SEE ALSO
ssh-agent-filter(1), ssh(1), ssh-agent(1), ssh-add(1), whiptail(1), dialog(1)
ssh-agent-filter-0.4.1/changelog 0000664 0000000 0000000 00000034101 12573053174 0016550 0 ustar 00root root 0000000 0000000 commit 6bf9113ea96a99a5eb1b8f832497dd9e24857468
Author: Timo Weingärtner
Date: 2015-09-06 16:41:22 +0200
release 0.4.1
commit d4584ca24834ca07f34c27c99ddf48c4c9156947
Author: Timo Weingärtner
Date: 2015-09-06 16:40:23 +0200
update copyright
commit 33485a9d38ad40ee971695384cfc869ced281a8c
Author: Timo Weingärtner
Date: 2015-09-06 17:01:47 +0200
Makefile: link to pthread
some versions of gcc reference a pthread function in the header
commit ad1c2d2b28209654b447e1a5198c6516cfa50b88
Author: Timo Weingärtner
Date: 2015-08-31 23:36:29 +0200
call functions with namespace instead of using their names
avoids problems with ADL
Closes: #797235
commit 8f675da301eafe79897f3ad67ff5450fcc397f78
Author: Timo Weingärtner
Date: 2015-08-31 20:22:37 +0200
move rfc4251 types into their own namespace
commit 774ff2757de2a32c57046cbdc8425c6c22759035
Author: Timo Weingärtner
Date: 2015-08-28 19:12:58 +0200
rename C++ header to .H
commit d9ffc789b1c7e781acbdd8310aef871dc3a41c13 (tag: 0.4)
Author: Timo Weingärtner
Date: 2014-05-26 23:47:02 +0200
release 0.4
commit 57f385d44cdc4eec0d0d2de7ea04ade6f4154dbf
Author: Timo Weingärtner
Date: 2014-05-27 00:16:40 +0200
update copyright
commit 4318a9a998f78f1d6ee4d32facd0fc8e1e231179
Author: Timo Weingärtner
Date: 2014-05-26 23:36:33 +0200
add dissection of pam_ssh_agent_auth data
commit 5cc6f72612187001f70255f6097437381cf49bba
Author: Timo Weingärtner
Date: 2014-05-26 20:41:08 +0200
rfc4251uint64: fix byte order conversion
commit 023a56e7d7483531219280af2e17760168cfaf7e
Author: Timo Weingärtner
Date: 2014-05-12 21:39:42 +0200
use a mutex for fd creation and forks
so we can have the CLOEXEC flag applied before a concurrent fork&exec.
use select() to avoid blocking while holding the mutex.
commit 38a60755c7fa8e90b08273c6f2a0563ffc433f75
Author: Timo Weingärtner
Date: 2014-05-10 00:48:36 +0200
also replace custom fatal errors with exceptions
commit 655b6084a5133d01a513c976b8b2567a71ba30c4
Author: Timo Weingärtner
Date: 2014-05-09 22:21:52 +0200
throw system_error instead of calling perror, exit
commit 823dba2ac91f84a4ae75372c5636ad49d6cef1ba
Author: Timo Weingärtner
Date: 2014-05-09 21:42:10 +0200
factor out cloexec setting and stream exception arming
commit b7d43361c44a214fa1b891fba7ea096650a6adca
Author: Timo Weingärtner
Date: 2014-05-07 21:34:53 +0200
add more #include's, add using's for often-used names
commit a257a44837e78d283f1735b4685618c270aa54bc
Author: Timo Weingärtner
Date: 2014-04-20 23:35:04 +0200
use boost::iostreams instead of std::stringstreams
boost::iostreams::array_source instead of istringstream
boost::iostreams::back_insert_device instead of ostringstream
this should save at least one copy each and still has length checks (input)
or dynamic growth (output)
commit a7f6e0c1d8553df678aa7b401eb374cf179210f7
Author: Timo Weingärtner
Date: 2014-04-18 13:55:30 +0200
use a boost stream directly
instead of declaring an intermediate stream_buffer
commit 185d1b9525cb132bc802cdecbc6901ed30d58555
Author: Timo Weingärtner
Date: 2014-04-17 21:30:27 +0200
rfc4251string: drop unused and dangerous constructor from just a pointer
better use std::istringstream or boost::iostream::array_source
commit ec5920ac2ed11b29135acb834ce6d633259aad75
Author: Timo Weingärtner
Date: 2014-04-15 20:09:21 +0200
rfc4251: move remaining non-inline functions to impl file
commit afc8cbf6fad71317ee11b6e6374f8f3ce4816197
Author: Timo Weingärtner
Date: 2014-04-14 21:38:45 +0200
rfc4251*: add constructors from std::istream and use them
commit ca4c9a28590919b6c0fc49cefdaf967758d5e4a0
Author: Timo Weingärtner
Date: 2014-04-14 21:10:11 +0200
do clean exit after receiving signal
commit 26b246ac93d59a7f7ba29cff36ad1a3e61306a58
Author: Timo Weingärtner
Date: 2014-04-14 21:08:54 +0200
cosmetic: fix double semicolons
commit 7d0f47c171b716b7e138157f8165ebf790227582
Author: Timo Weingärtner
Date: 2014-03-23 23:40:49 +0100
rfc4251string: add more operators
this adds <= > >= !=
commit f4343c2060ea70639dfc7c9a5eeb70f0b5ec5697
Author: Timo Weingärtner
Date: 2014-03-22 22:34:35 +0100
tab align auth_data_ssh dissection for readability
commit ed9ca11a8dc24bed5f8e69e2a62169e7a484d8fb
Author: Timo Weingärtner
Date: 2014-03-06 21:22:57 +0100
enable large file support
this should make some tests for LFS happy; we don't use sizes of or offsets in files here
commit 477a0a0f1507413be7a5d2882aba28d01f7e6111 (tag: 0.3.1)
Author: Timo Weingärtner
Date: 2013-12-19 15:47:43 +0100
release 0.3.1
commit a8c1ef855655e7419e54317a8e782f3993d99f7d
Author: Timo Weingärtner
Date: 2013-11-13 23:42:46 +0100
use LDLIBS instead of LDFLAGS
LDLIBS are put behind the prerequisites by make's built-in rules so linking
won't fail with --as-needed.
commit a42c87e6a761a56ebc63cd7728fa2126b2e8805f
Author: Timo Weingärtner
Date: 2013-11-02 12:27:10 +0100
(re)unify client iostreams
boost::iostreams does not do lseek()s without being asked
extend try-block around entire function
commit b05034bc176b38b3b3f31c7a2e1e53b4c16f61e2
Author: Timo Weingärtner
Date: 2013-11-02 11:38:40 +0100
replace __gnu_cxx::stdio_filebuf with boost::iostreams
commit d11b2c830b7c7676d9c275d038f6a9593af2a4b8
Author: chrysn
Date: 2013-10-26 10:53:24 +0200
confirm the license statement about files i created
commit bd2154e05c0ab15d8e25f997fb4e6ec61f7a4c1f (tag: 0.3)
Author: Timo Weingärtner
Date: 2013-10-26 01:18:11 +0200
release 0.3
commit 5d55704009d1052db6f4039544aedb17ca8f541b
Author: chrysn
Date: 2013-10-26 00:50:36 +0200
ssh-askpass-noinput: a simpler confirmation dialog
this adds an ssh-askpass imlementation that will only show allow/deny
buttons and is based on zenity.
commit d8b50eb96e4e4f971803fcf2ba30312b2dac9d08
Author: Timo Weingärtner
Date: 2013-10-25 21:28:32 +0200
update documentation to mention confirmation stuff
Thanks: Christian Amsüss for requesting that feature
commit fad26b644eef6883810203a1bd143180484ff8fb
Author: Timo Weingärtner
Date: 2013-10-23 21:24:15 +0200
add quotes around ssh-agent-filter's name
commit 8401112f358cd35ea72ddf2d67effbf3ac782a5e
Author: Timo Weingärtner
Date: 2013-10-23 21:20:29 +0200
rfc4251.h: add #include
commit 4bea277b6a2efd93321e5d6a0d96c87eb4d4e7c5
Author: Timo Weingärtner
Date: 2013-10-11 11:51:42 +0200
add confirmed key operations
normal ssh authentications get dissected to allow the user a more
informed decision.
commit 82f6ec6201c4fb64d0fc9ec43e9c003849ddc6ba
Author: Timo Weingärtner
Date: 2013-10-11 11:45:06 +0200
update bash-completion for confirmation options
commit be10d6a2c1b646ce3cc67bab2896dd3720a80e64
Author: Timo Weingärtner
Date: 2013-10-09 20:18:07 +0200
improve inserting into (allow|confirm)ed_pubkeys
commit cf11590789a66485623ed11508ae137e2b78a96d
Author: Timo Weingärtner
Date: 2013-10-09 18:15:57 +0200
add cmdline options for confirmation
commit 48ae39cf004d22c0cf96703e382dec41304c3280
Author: Timo Weingärtner
Date: 2013-09-22 23:26:20 +0200
add confirmation via ssh-askpass
commit 4b2644c5cf45bb0775e777667aa5a54b9cd6bef8
Author: Timo Weingärtner
Date: 2013-09-22 23:23:11 +0200
add CLOEXEC flag to sockets
SOCK_CLOEXEC is currently only available on linux >= 2.6.27 so fcntl is used
as a fallback.
commit 06df197ec118243a073923bb9f6803ffa426ea89
Author: Timo Weingärtner
Date: 2013-09-19 13:15:24 +0200
ssh-agent-filter.bash-completion: add missing license
commit 59f0ba5eb0a1a4c9bcada66bfe3cf1780e268aff
Author: Timo Weingärtner
Date: 2013-09-18 16:43:22 +0200
add one missing exception activation
commit 3707680021de040472cd792131a8df42902d08ba
Author: Timo Weingärtner
Date: 2013-09-18 16:40:21 +0200
also print out SSH_AUTH_SOCK in debug mode
commit f6ae7a38cfec1d4f8abc6d5c13999682efcfca03
Author: Timo Weingärtner
Date: 2013-09-18 15:24:32 +0200
afssh.1.md: complete the sentence.
commit ad2ee59254259fb117a16f3cc60c9a19b7c78ab9 (tag: 0.2)
Author: Timo Weingärtner
Date: 2013-09-08 17:20:11 +0200
release 0.2
commit bd8e837efbc00eb49607ca493287d307ea47697b
Author: Timo Weingärtner
Date: 2013-09-01 12:32:55 +0200
move mpint/mpz conversion into separate file
these functions need linking against libgmp
commit 84ab40ff5fc9d19066c579fce94cd6c24d1d3b90
Author: Timo Weingärtner
Date: 2013-08-31 16:07:56 +0200
add basic bash-completion
escaping of some special chars is not handled yet
commit 9826dce1feec00b2759eb91c771068a11e77a219
Author: Timo Weingärtner
Date: 2013-08-31 18:14:01 +0200
reorganize import code for name-list and mpint
reuse some common parts
commit 21ec6082f66b6b5eb8ec6d4e9a03b7c3f101a07f
Author: Timo Weingärtner
Date: 2013-08-30 21:29:44 +0200
Makefile: add libstdc++ to LDFLAGS
commit add51c0b13a3b2c2c3c35c5b2c87f0931df6ec94
Author: Timo Weingärtner
Date: 2013-08-31 18:18:19 +0200
remove some inline specifiers
* from functions defined inside the struct
* from non-trivial functions
commit b7ece6c5ba3670e653ce19d759e6cfb48e6cf4ff
Author: Timo Weingärtner
Date: 2013-08-26 11:56:14 +0200
remove declarations for default copy and move
commit 19e42fff7ce4529720c0255e70c547a277cd9663
Author: Timo Weingärtner
Date: 2013-07-15 20:39:35 +0200
use more uniform initialization
std::string(1, ) becomes std::string{}
also fix accidental use of ssize_t instead of size_t with gmp
This yielded two warnings (-Wnarrowing) where a size_t is used to initialize
an rfc4251uint32, they were fixed with a cast.
commit f2fe95a2720e31b66dc60c1109b05af7475f35db
Author: Timo Weingärtner
Date: 2013-07-19 21:35:50 +0200
rfc4251string: add length checks
commit 6bc571e8e273f2c1efd12f83f43bb56f07242d32
Author: Timo Weingärtner
Date: 2013-07-19 21:29:25 +0200
Makefile: reset version.h on clean when in git
commit 1b8707339da5b8d7fb976b49488b2752415850ae
Author: Timo Weingärtner
Date: 2013-07-15 23:59:22 +0200
remove unneeded namespace qualification, ADL works here
commit ac2c716b4bdb463ba6dfd4a1b82595c3ea861d01
Author: Timo Weingärtner
Date: 2013-07-15 20:37:47 +0200
improve debug mode
also clean up socket in debug mode
also exit when catching SIGINT
commit 9e8adf8438d3ca343a9161725e6f0ff68e44832c
Author: Timo Weingärtner
Date: 2013-07-02 01:32:13 +0200
rfc4251string: implement name-list (as vector)
commit 6ba5bcba015ddcda1b81bd83a3dface81fdee52c
Author: Timo Weingärtner
Date: 2013-07-02 01:25:03 +0200
rfc4251string: don't store the length
commit 23f63eb81167afaa14ecfbbfd30c106b70659fe5
Author: Timo Weingärtner
Date: 2013-07-01 16:04:04 +0200
add manpage for afssh(1)
using pandoc to generate groff from markdown
commit f35640624b3e02bd259533bdf453f55e003ee76b
Author: Timo Weingärtner
Date: 2013-07-01 16:20:15 +0200
fix README formatting, rename to README.md
commit d177c0fc8d08da5af909ce810696541c6ac23750
Author: Timo Weingärtner
Date: 2013-06-20 18:59:41 +0200
add README
commit 3db5e4a6aa2e85492638438dac5719ce633ad6f5
Author: Timo Weingärtner
Date: 2013-06-20 16:00:08 +0200
add detection for output to terminal vs. pipe
commit e9f27a1f6c79fddabd5995a591a8398ca645c53f
Author: Timo Weingärtner
Date: 2013-06-20 15:56:49 +0200
afssh: add interactive key selection using whiptail/dialog
commit 6064fef975a261aab7e92792c2a83687ae1fdb9e
Author: Timo Weingärtner
Date: 2013-06-20 15:54:30 +0200
afssh: add safeguard against empty or non-running ssh-agent
commit 07557734129cd53acb5eff9d59b0d6144925e3e7
Author: Timo Weingärtner
Date: 2013-06-20 15:51:30 +0200
afssh: factor out usage
commit 3c431f0dfb0223f95bf318d4fe209a81f36e88d1
Author: Timo Weingärtner
Date: 2013-06-18 12:35:28 +0200
documentation update
ssh-agent-filter.C: remove remains of initial plan to wrap ssh in the filter
afssh: add --help
commit 453e8a66e8ed850d9a7559c8269942969bad62c9
Author: Timo Weingärtner
Date: 2013-06-18 11:40:19 +0200
afssh: use temporary directory for socket
commit 3693a5a901b237a0271c67bfd92b6fc4d87aa4f9 (tag: 0.1)
Author: Timo Weingärtner
Date: 2013-06-18 00:55:02 +0200
release 0.1
commit 6650d5dd2f08c1d2fff9d4c35fce5428da2dd174
Author: Timo Weingärtner
Date: 2013-06-18 00:45:20 +0200
add afssh: wrapper around ssh-agent-filter and ssh
commit 5a20fe397c6ca9818800ad183d603d5d1ab43a9d
Author: Timo Weingärtner
Date: 2013-06-18 00:23:26 +0200
remove double quoting caused by using boost::filesystem::path
commit b97f64c5f81c682933ab667dca93e6713efefd51
Author: Timo Weingärtner
Date: 2013-06-17 20:43:56 +0200
fix description of debug option
commit 7ed93d297cda37e9f0e89a54ab270d73e3cb4f3c
Author: Timo Weingärtner
Date: 2013-06-17 20:33:38 +0200
Initial commit
ssh-agent-filter-0.4.1/rfc4251.C 0000664 0000000 0000000 00000003533 12573053174 0016075 0 ustar 00root root 0000000 0000000 /*
* rfc4251.C -- support for name-list type from RFC 4251, section 5
*
* These are the conversions between an rfc4251::string containing a name-list
* and vector.
*
* Copyright (C) 2013,2015 Timo Weingärtner
*
* This file is part of ssh-agent-filter.
*
* ssh-agent-filter is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ssh-agent-filter is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ssh-agent-filter. If not, see .
*/
#include "rfc4251.H"
namespace rfc4251 {
string::string (std::vector const & v) {
for (auto it = v.begin(); it != v.end();) {
if (it->size() == 0)
throw std::length_error{"name of zero length"};
if (value.size() + it->size() > std::numeric_limits::max())
throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
value.insert(value.end(), it->data(), it->data() + it->size());
++it;
if (it == v.end())
break;
value.push_back(',');
}
}
string::operator std::vector () const {
std::vector ret;
auto name_start = value.begin();
if (name_start != value.end())
for (auto it = name_start; ; ++it) {
if (it == value.end() or *it == ',') {
if (it == name_start)
throw std::length_error{"name of zero length"};
ret.emplace_back(name_start, it);
name_start = it + 1;
}
if (it == value.end())
break;
}
return ret;
}
}
ssh-agent-filter-0.4.1/rfc4251.H 0000664 0000000 0000000 00000012316 12573053174 0016101 0 ustar 00root root 0000000 0000000 /*
* rfc4251.h -- implements types from RFC 4251, section 5
*
* rfc4251::byte byte
* rfc4251::boolean boolean
* rfc4251::uint32 uint32
* rfc4251::uint64 uint64
* rfc4251::string string, incl. mpint and name-list
*
* those structs contain the objects in their RFC 4251 representation,
* conversions are provided via constructors and cast operators
*
* Copyright (C) 2013-2015 Timo Weingärtner
*
* This file is part of ssh-agent-filter.
*
* ssh-agent-filter is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ssh-agent-filter is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ssh-agent-filter. If not, see .
*/
#include
#include
#include
#include
#include
#include // ntohl() / htonl()
#include
#include
namespace rfc4251 {
struct byte {
union {
uint8_t value;
char buf[1];
};
byte () = default;
explicit byte (uint8_t v) : value(v) {}
inline explicit byte (std::istream &);
operator uint8_t () const { return value; }
};
inline std::istream & operator>> (std::istream & is, byte & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, byte const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline byte::byte (std::istream & is) {
is >> *this;
}
struct boolean {
union {
bool value;
char buf[1];
};
boolean () = default;
explicit boolean (uint8_t v) : value(v) {}
inline explicit boolean (std::istream &);
operator uint8_t () const { return value; }
};
inline std::istream & operator>> (std::istream & is, boolean & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, boolean const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline boolean::boolean (std::istream & is) {
is >> *this;
}
struct uint32 {
union {
uint32_t value;
char buf[4];
};
uint32 () = default;
explicit uint32 (uint32_t v) { value = htonl(v); }
inline explicit uint32 (std::istream &);
operator uint32_t () const { return ntohl(value); }
};
inline std::istream & operator>> (std::istream & is, uint32 & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, uint32 const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline uint32::uint32 (std::istream & is) {
is >> *this;
}
struct uint64 {
union {
uint64_t value;
char buf[8];
};
uint64 () = default;
inline explicit uint64 (uint64_t v);
inline explicit uint64 (std::istream &);
inline explicit operator uint64_t () const;
};
inline uint64::uint64 (uint64_t v) {
for (int_fast8_t i{7}; i >= 0; --i) {
buf[i] = v & 0xff;
v >>= 8;
}
}
inline uint64::operator uint64_t () const {
uint64_t ret{0};
for (uint_fast8_t i{0}; i < 8; ++i) {
ret <<= 8;
ret |= static_cast(buf[i]);
}
return ret;
}
inline std::istream & operator>> (std::istream & is, uint64 & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, uint64 const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline uint64::uint64 (std::istream & is) {
is >> *this;
}
struct string : boost::totally_ordered {
std::vector value;
string () = default;
inline explicit string (char const *, size_t);
explicit string (std::string const & s) : string{s.data(), s.size()} {}
explicit string (std::vector const &);
explicit string (mpz_srcptr);
explicit string (mpz_class const & x) : string{x.get_mpz_t()} {}
inline explicit string (std::istream &);
size_t size () const { return value.size(); }
char const * data () const { return value.data(); }
char * data () { return value.data(); }
operator std::string () const { return {value.begin(), value.end()}; }
operator std::vector () const;
operator mpz_class () const;
};
inline string::string (char const * s, size_t l) {
if (l > std::numeric_limits::max())
throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
value.insert(value.end(), s, s + l);
}
inline std::istream & operator>> (std::istream & is, string & s) {
s.value.clear();
uint32 len;
if (is >> len) {
s.value.resize(len);
is.read(s.value.data(), len);
}
return is;
}
inline std::ostream & operator<< (std::ostream & os, string const & s) {
if (s.value.size() > std::numeric_limits::max())
throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
if (os << uint32{static_cast(s.value.size())})
os.write(s.value.data(), s.value.size());
return os;
}
inline string::string (std::istream & is) {
is >> *this;
}
inline bool operator== (string const & l, string const & r) {
return l.value == r.value;
}
inline bool operator< (string const & l, string const & r) {
return l.value < r.value;
}
}
ssh-agent-filter-0.4.1/rfc4251_gmp.C 0000664 0000000 0000000 00000004010 12573053174 0016727 0 ustar 00root root 0000000 0000000 /*
* rfc4251_gmp.C -- implements mpint/gmp conversions for rfc4251::string
*
* these functions need linking against libgmp
*
* Copyright (C) 2013,2015 Timo Weingärtner
*
* This file is part of ssh-agent-filter.
*
* ssh-agent-filter is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ssh-agent-filter is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ssh-agent-filter. If not, see .
*/
#include "rfc4251.H"
namespace rfc4251 {
string::string (mpz_srcptr x) {
if (mpz_sgn(x) == 0)
return;
auto const import_positive = [] (mpz_srcptr x, std::vector & value) {
size_t bits{mpz_sizeinbase(x, 2)};
size_t bytes{(bits + 7) / 8};
size_t extrabyte{(bits % 8) == 0}; // need extra byte if MSB is 1 to keep it non-negative
if (bytes + extrabyte > std::numeric_limits::max())
throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
value.resize(bytes + extrabyte);
value[0] = 0;
mpz_export(value.data() + extrabyte, nullptr, 1, 1, 1, 0, x);
};
if (mpz_sgn(x) == 1)
import_positive(x, value);
else {
// handle two's complement: add 1, invert all bits
mpz_class tmp{x};
tmp += 1;
import_positive(tmp.get_mpz_t(), value);
for (auto & i : value)
i ^= 0xff;
}
}
string::operator mpz_class () const {
mpz_class ret;
mpz_import(ret.get_mpz_t(), value.size(), 1, 1, 1, 0, value.data());
if (mpz_sizeinbase(ret.get_mpz_t(), 2) == value.size() * 8) { // negative
mpz_com(ret.get_mpz_t(), ret.get_mpz_t());
ret += 1;
mpz_neg(ret.get_mpz_t(), ret.get_mpz_t());
}
return ret;
}
}
ssh-agent-filter-0.4.1/ssh-agent-filter.C 0000664 0000000 0000000 00000041455 12573053174 0020170 0 ustar 00root root 0000000 0000000 /*
* ssh-agent-filter.C -- filtering proxy for ssh-agent meant to be forwarded to untrusted servers
*
* Copyright (C) 2013-2015 Timo Weingärtner
*
* This file is part of ssh-agent-filter.
*
* ssh-agent-filter is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ssh-agent-filter is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ssh-agent-filter. If not, see .
*/
#include
namespace po = boost::program_options;
#include
namespace fs = boost::filesystem;
#include
#include
#include
#include
namespace io = boost::iostreams;
#include
using std::string;
#include
using std::vector;
#include
#include