8000 Pass hostkey & port to host verify callback by fxcoudert · Pull Request #6503 · libgit2/libgit2 · GitHub
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Merged
merged 3 commits into from
Feb 24, 2023
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Pass hostkey & port to host verify callback #6503

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c2bdef6
net: parse urls or scp style paths in the same function
Feb 24, 2023
f68b40c
Pass hostkey & port to host verify callback
fxcoudert Feb 24, 2023
43e84e2
tests: validate host and port for ssh tests when non-standard
Feb 24, 2023
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Pass hostkey & port to host verify callback 
Co-authored-by: Stefan Karpinski <stefan@karpinski.org>
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@fxcoudert @StefanKarpinski @ethomson
2 people authored and ethomson committed Feb 24, 2023
commit f68b40c0af9c7c5c2c8740fe4a8fbcba367e0087
14 changes: 11 additions & 3 deletions src/libgit2/transports/ssh.c
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Original file line number Diff line number Diff line change
Expand Up @@ -651,6 +651,8 @@ static int check_against_known_hosts(
return ret;
}

#define SSH_DEFAULT_PORT 22

/*
* Perform the check for the session's certificate against known hosts if
* possible and then ask the user if they have a callback.
Expand Down Expand Up @@ -748,23 +750,29 @@ static int check_certificate(
if (check_cb != NULL) {
git_cert_hostkey *cert_ptr = &cert;
git_error_state previous_error = {0};
const char *host_ptr = host;
git_str host_and_port = GIT_STR_INIT;

if (port != SSH_DEFAULT_PORT) {
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_git_ssh_setup_conn sets port to -1 to indicate default but here it is compared to SSH_DEFAULT_PORT that is defined as 22.

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It does. But git_net_url_parse and friends should enforce that the port is a number, and set them to the default if the port number is omitted. So the port = -1 should never be reached. As a result, I changed the strtol failure to an actual error. Good catch, thanks!

git_str_printf(&host_and_port, "%s:%d", host, port);
host_ptr = host_and_port.ptr;
}
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@ethomson ethomson Feb 24, 2023 •
edited
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We should use our git_str class here, and we should avoid the unnecessary strdup in the common case. Something more like:

const char *host_ptr = host;
git_str host_and_port = GIT_STR_INIT;

if (port != SSH_DEFAULT_PORT) {
    git_str_printf(&host_and_port, "%s:%d", host, port);
    host_ptr = host_and_port.ptr;
}

// use host_ptr

git_str_free(&host_and_port);


git_error_state_capture(&previous_error, error);
error = check_cb((git_cert *) cert_ptr, cert_valid, host, check_cb_payload);
error = check_cb((git_cert *) cert_ptr, cert_valid, host_ptr, check_cb_payload);
if (error == GIT_PASSTHROUGH) {
error = git_error_state_restore(&previous_error);
} else if (error < 0 && !git_error_last()) {
git_error_set(GIT_ERROR_NET, "unknown remote host key");
}

git_error_state_free(&previous_error);
git_str_dispose(&host_and_port);
}

return error;
}

#define SSH_DEFAULT_PORT "22"

static int _git_ssh_setup_conn(
ssh_subtransport *t,
const char *url,
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