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Read sshd_config #2

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Read sshd_config #2

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30 changes: 24 additions & 6 deletions ssh-pairing-server.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,17 +18,35 @@ int main(int argc, char *argv[])
if (argc != 1) {
fprintf(stderr, "Usage: ssh-pairing-server\n\n"
"SSH server which prints received public keys to stdout.\n"
"It uses libssh's default config and accepts only a single connection.\n");
"It reads sshd_config and accepts only a single connection.\n");
exit(1);
}

ssh_bind bind = ssh_bind_new();

// If a file doesn't exist it's ignored. If no host keys are available,
// ssh_bind_listen will fail immediately with a helpful error.
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_ecdsa_key");
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_ed25519_key");
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_rsa_key");
// Read OpenSSH's config file.
{
const char *sshd_config_path = "/usr/etc/ssh/sshd_config";
if (access("/etc/ssh/sshd_config", F_OK) == 0)
sshd_config_path = "/etc/ssh/sshd_config";

if (ssh_bind_options_parse_config(bind, sshd_config_path) != SSH_OK) {
fprintf(stderr, "Failed to parse config: %s\n", ssh_get_error(bind));
return 1;
}
}

// Work around https://gitlab.com/libssh/libssh-mirror/-/issues/234,
// set the default host key paths explicitly.
// TODO: Add a proper version check once the fix is in a released version.
//if (ssh_version(SSH_VERSION_INT(0, 10, 90)) == NULL) {
if (1) {
// If a file doesn't exist it's ignored. If no host keys are available,
// ssh_bind_listen will fail immediately with a helpful error.
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_ecdsa_key");
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_ed25519_key");
ssh_bind_options_set(bind, SSH_BIND_OPTIONS_HOSTKEY, "/etc/ssh/ssh_host_rsa_key");
}

if (ssh_bind_listen(bind) < 0) {
fprintf(stderr, "Failed to listen: %s\n", ssh_get_error(bind));
Expand Down