Commit | Line | Data |
---|---|---|
b147e573 MW |
1 | #! /bin/sh |
2 | ||
3 | set -e | |
4 | ||
5 | ### This script performs the passive side of a dynamic association. It is | |
6 | ### intended to be set as the `tripe' user's shell, and invoked via ssh(1). | |
7 | ### Specifically, for each dynamic peer, add a line to `.ssh/authorized_keys' | |
8 | ### of the form | |
9 | ### | |
10 | ### command="PEER" ssh-rsa ... | |
11 | ### | |
12 | ### There's an additional wrinkle. Suppose that the passive TrIPE endpoint | |
13 | ### is behind a NAT, and the SSH gateway is on a different machine. The | |
14 | ### gateway should have its own `tripe' user, and this script should again be | |
15 | ### its shell. On the gateway, add a `.ssh/authorized_keys' entry | |
16 | ### | |
17 | ### command="tripe@SERVER:PEER" ssh-rsa ... | |
18 | ### | |
19 | ### for the dynamic endpoint. On the passive endpoint itself, you need an | |
20 | ### entry for the gateway's `tripe' user's key, with no command. | |
21 | ||
22 | : ${prefix=@prefix@} ${exec_prefix=@exec_prefix@} | |
23 | : ${bindir=@bindir@} | |
24 | : ${TRIPEDIR=@configdir@} ${TRIPESOCK=@socketdir@/tripesock} | |
25 | : ${tripectl=$bindir/tripectl} | |
26 | export TRIPEDIR TRIPESOCK | |
27 | ||
d3731285 MW |
28 | ## Make sure we're being called properly, and figure out the peer identity. |
29 | case "$#,$1" in | |
30 | 2,-c) ;; | |
31 | *) | |
32 | echo >&2 "usage: $0 -c '[SERVER:]PEER [hello|goodbye]'" | |
33 | exit 1 | |
b147e573 | 34 | ;; |
d3731285 | 35 | esac |
b147e573 | 36 | |
d3731285 MW |
37 | ## SSH has smushed all of our arguments together, so let's split them apart |
38 | ## again. | |
39 | set -- $2 | |
40 | ||
41 | ## Examine the peer identifier and work out how to proceed. | |
42 | case "$#,$1" in | |
43 | 0,*) echo >&2 "$0: missing peer identifier"; exit 1 ;; | |
44 | *:*) mode=proxy server=${1%:*} user=${1##*:} ;; | |
45 | *) mode=local user=$1 ;; | |
46 | esac | |
47 | shift | |
b147e573 | 48 | |
d3731285 MW |
49 | ## If there's no action then check to see whether SSH has hidden one |
50 | ## somewhere. Make sure the command looks sensible. | |
51 | case "$#" in 0) set -- $SSH_ORIGINAL_COMMAND ;; esac | |
52 | case "$#,$1" in | |
53 | 0, | 1,hello) act=hello ;; | |
54 | 1,goodbye) act=goodbye ;; | |
55 | *) echo >&2 "$0: unknown action spec \`$*'"; exit 1 ;; | |
56 | esac | |
57 | ||
58 | ## Now actually do something. | |
59 | case "$mode,$act" in | |
60 | proxy,*) | |
61 | exec ssh "$server" "$user" "$act" | |
62 | ;; | |
63 | local,hello) | |
64 | exec $tripectl SVCSUBMIT connect passive "$user" | |
65 | ;; | |
66 | local,goodbye) | |
67 | peer=$($tripectl SVCSUBMIT connect userpeer "$user") | |
68 | exec $tripectl KILL "$peer" | |
69 | ;; | |
b147e573 | 70 | *) |
d3731285 | 71 | echo >&2 "$0: unknown mode/action $mode/$act" |
b147e573 MW |
72 | exit 1 |
73 | ;; | |
b147e573 | 74 | esac |