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Allow new_connection to take an optional Seat. (NFC)

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This is working towards allowing the subsidiary SSH connection in an
SshProxy to share the main user-facing Seat, so as to be able to pass
through interactive prompts.

This is more difficult than the similar change with LogPolicy, because
Seats are stateful. In particular, the trust-sigil status will need to
be controlled by the SshProxy until it's ready to pass over control to
the main SSH (or whatever) connection.

To make this work, I've introduced a thing called a TempSeat, which is
(yet) another Seat implementation. When a backend hands its Seat to
new_connection(), it does it in a way that allows new_connection() to
borrow it completely, and replace it in the main backend structure
with a TempSeat, which acts as a temporary placeholder. If the main
backend tries to do things like changing trust status or sending
output, the TempSeat will buffer them; later on, when the connection
is established, TempSeat will replay the changes into the real Seat.

So, in each backend, I've made the following changes:
 - pass &foo->seat to new_connection, which may overwrite it with a
   TempSeat.
 - if it has done so (which we can tell via the is_tempseat() query
   function), then we have to free the TempSeat and reinstate our main
   Seat. The signal that we can do so is the PLUGLOG_CONNECT_SUCCESS
   notification, which indicates that SshProxy has finished all its
   connection setup work.
 - we also have to remember to free the TempSeat if our backend is
   disposed of without that having happened (e.g. because the
   connection _doesn't_ succeed).
 - in backends which have no local auth phase to worry about, ensure
   we don't call seat_set_trust_status on the main Seat _before_ it
   gets potentially replaced with a TempSeat. Moved some calls of
   seat_set_trust_status to just after new_connection(), so that now
   the initial trust status setup will go into the TempSeat (if
   appropriate) and be buffered until that seat is relinquished.

In all other uses of new_connection, where we don't have a Seat
available at all, we just pass NULL.

This is NFC, because neither new_connection() nor any of its delegates
will _actually_ do this replacement yet. We're just setting up the
framework to enable it to do so in the next commit.
This commit is contained in:
Simon Tatham
2021-09-13 17:17:20 +01:00
parent a08f953bd6
commit 6d272ee007
14 changed files with 465 additions and 21 deletions
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2
unix/pageant.c
View File

@ -1190,7 +1190,7 @@ void run_agent(FILE *logfp, const char *symlink_path)
s = new_connection(sk_addr_dup(disp->addr),
disp->realhost, disp->port,
false, true, false, false, &conn->plug, conf,
NULL);
NULL, NULL);
if ((err = sk_socket_error(s)) != NULL) {
fprintf(stderr, "pageant: unable to connect to X server: %s", err);
exit(1);

2
unix/sharing.c
View File

@ -297,7 +297,7 @@ int platform_ssh_share(const char *pi_name, Conf *conf,
if (can_downstream) {
retsock = new_connection(unix_sock_addr(sockname),
"", 0, false, true, false, false,
downplug, conf, NULL);
downplug, conf, NULL, NULL);
if (sk_socket_error(retsock) == NULL) {
sfree(*logtext);
*logtext = sockname;