Mercurial > dropbear
diff svr-runopts.c @ 1442:517c67cbcd31
dropbear server: support -T max auth tries
Add support for '-T n' for a run-time specification for maximum number
of authentication attempts where 'n' is between 1 and compile time
option MAX_AUTH_TRIES.
A default number of tries can be specified at compile time using
'DEFAULT_AUTH_TRIES' which itself defaults to MAX_AUTH_TRIES for
backwards compatibility.
Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
| author | Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk> |
|---|---|
| date | Mon, 29 May 2017 10:25:09 +0100 |
| parents | e8f67918fdc9 |
| children | a3a96dbf9a58 |
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--- a/svr-runopts.c Sat Jun 24 23:32:25 2017 +0800 +++ b/svr-runopts.c Mon May 29 10:25:09 2017 +0100 @@ -73,6 +73,7 @@ "-g Disable password logins for root\n" "-B Allow blank password logins\n" #endif + "-T <1 to %d> Maximum authentication tries (default %d)\n" #if DROPBEAR_SVR_LOCALTCPFWD "-j Disable local port forwarding\n" #endif @@ -107,6 +108,7 @@ #if DROPBEAR_ECDSA ECDSA_PRIV_FILENAME, #endif + MAX_AUTH_TRIES, DEFAULT_AUTH_TRIES, DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE, DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT); } @@ -119,6 +121,7 @@ char* recv_window_arg = NULL; char* keepalive_arg = NULL; char* idle_timeout_arg = NULL; + char* maxauthtries_arg = NULL; char* keyfile = NULL; char c; @@ -132,6 +135,7 @@ svr_opts.noauthpass = 0; svr_opts.norootpass = 0; svr_opts.allowblankpass = 0; + svr_opts.maxauthtries = DEFAULT_AUTH_TRIES; svr_opts.inetdmode = 0; svr_opts.portcount = 0; svr_opts.hostkey = NULL; @@ -235,6 +239,9 @@ case 'I': next = &idle_timeout_arg; break; + case 'T': + next = &maxauthtries_arg; + break; #if DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH case 's': svr_opts.noauthpass = 1; @@ -331,6 +338,16 @@ dropbear_exit("Bad recv window '%s'", recv_window_arg); } } + + if (maxauthtries_arg) { + unsigned int val = 0; + if (m_str_to_uint(maxauthtries_arg, &val) == DROPBEAR_FAILURE || + val == 0 || val > MAX_AUTH_TRIES) { + dropbear_exit("Bad maxauthtries '%s'", maxauthtries_arg); + } + svr_opts.maxauthtries = val; + } + if (keepalive_arg) { unsigned int val;