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-rw-r--r--package/network/services/dropbear/patches/001-fix-MAX_UNAUTH_CLIENTS-regression.patch134
1 files changed, 134 insertions, 0 deletions
diff --git a/package/network/services/dropbear/patches/001-fix-MAX_UNAUTH_CLIENTS-regression.patch b/package/network/services/dropbear/patches/001-fix-MAX_UNAUTH_CLIENTS-regression.patch
new file mode 100644
index 0000000000..e0dca544ec
--- /dev/null
+++ b/package/network/services/dropbear/patches/001-fix-MAX_UNAUTH_CLIENTS-regression.patch
@@ -0,0 +1,134 @@
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Wed, 8 Jun 2022 21:26:20 +0800
+Subject: Fix MAX_UNAUTH_CLIENTS regression
+
+Since re-exec change in 2022.82 Dropbear count
+treat authenticated sessions towards the unauthenticated
+session limit. This is fixed by passing the childpipe FD
+through to the re-execed process.
+---
+ runopts.h | 5 +++--
+ svr-main.c | 21 +++++++++++----------
+ svr-runopts.c | 15 ++++++++++++---
+ 3 files changed, 26 insertions(+), 15 deletions(-)
+
+--- a/runopts.h
++++ b/runopts.h
+@@ -79,8 +79,9 @@ typedef struct svr_runopts {
+ char *addresses[DROPBEAR_MAX_PORTS];
+
+ int inetdmode;
+- /* Hidden "-2" flag indicates it's re-executing itself */
+- int reexec_child;
++ /* Hidden "-2 childpipe_fd" flag indicates it's re-executing itself,
++ stores the childpipe preauth file descriptor. Set to -1 otherwise. */
++ int reexec_childpipe;
+
+ /* Flags indicating whether to use ipv4 and ipv6 */
+ /* not used yet
+--- a/svr-main.c
++++ b/svr-main.c
+@@ -71,7 +71,7 @@ int main(int argc, char ** argv)
+ #endif
+
+ #if DROPBEAR_DO_REEXEC
+- if (svr_opts.reexec_child) {
++ if (svr_opts.reexec_childpipe >= 0) {
+ #ifdef PR_SET_NAME
+ /* Fix the "Name:" in /proc/pid/status, otherwise it's
+ a FD number from fexecve.
+@@ -102,7 +102,7 @@ static void main_inetd() {
+
+ seedrandom();
+
+- if (!svr_opts.reexec_child) {
++ if (svr_opts.reexec_childpipe < 0) {
+ /* In case our inetd was lax in logging source addresses */
+ get_socket_address(0, NULL, NULL, &host, &port, 0);
+ dropbear_log(LOG_INFO, "Child connection from %s:%s", host, port);
+@@ -115,10 +115,8 @@ static void main_inetd() {
+ setsid();
+ }
+
+- /* Start service program
+- * -1 is a dummy childpipe, just something we can close() without
+- * mattering. */
+- svr_session(0, -1);
++ /* -1 for childpipe in the inetd case is discarded */
++ svr_session(0, svr_opts.reexec_childpipe);
+
+ /* notreached */
+ }
+@@ -347,9 +345,10 @@ static void main_noinetd(int argc, char
+
+ if (execfd >= 0) {
+ #if DROPBEAR_DO_REEXEC
+- /* Add "-2" to the args and re-execute ourself. */
+- char **new_argv = m_malloc(sizeof(char*) * (argc+3));
+- int pos0 = 0, new_argc = argc+1;
++ /* Add "-2 childpipe[1]" to the args and re-execute ourself. */
++ char **new_argv = m_malloc(sizeof(char*) * (argc+4));
++ char buf[10];
++ int pos0 = 0, new_argc = argc+2;
+
+ /* We need to specially handle "dropbearmulti dropbear". */
+ if (multipath) {
+@@ -359,7 +358,9 @@ static void main_noinetd(int argc, char
+ }
+
+ memcpy(&new_argv[pos0], argv, sizeof(char*) * argc);
+- new_argv[new_argc-1] = "-2";
++ new_argv[new_argc-2] = "-2";
++ snprintf(buf, sizeof(buf), "%d", childpipe[1]);
++ new_argv[new_argc-1] = buf;
+ new_argv[new_argc] = NULL;
+
+ if ((dup2(childsock, STDIN_FILENO) < 0)) {
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -138,6 +138,7 @@ void svr_getopts(int argc, char ** argv)
+ char* keepalive_arg = NULL;
+ char* idle_timeout_arg = NULL;
+ char* maxauthtries_arg = NULL;
++ char* reexec_fd_arg = NULL;
+ char* keyfile = NULL;
+ char c;
+ #if DROPBEAR_PLUGIN
+@@ -175,6 +176,7 @@ void svr_getopts(int argc, char ** argv)
+ svr_opts.pubkey_plugin_options = NULL;
+ #endif
+ svr_opts.pass_on_env = 0;
++ svr_opts.reexec_childpipe = -1;
+
+ #ifndef DISABLE_ZLIB
+ opts.compress_mode = DROPBEAR_COMPRESS_DELAYED;
+@@ -250,12 +252,12 @@ void svr_getopts(int argc, char ** argv)
+ #if DROPBEAR_DO_REEXEC && NON_INETD_MODE
+ /* For internal use by re-exec */
+ case '2':
+- svr_opts.reexec_child = 1;
++ next = &reexec_fd_arg;
+ break;
+ #endif
+ case 'p':
+- nextisport = 1;
+- break;
++ nextisport = 1;
++ break;
+ case 'P':
+ next = &svr_opts.pidfile;
+ break;
+@@ -426,6 +428,13 @@ void svr_getopts(int argc, char ** argv)
+ dropbear_log(LOG_INFO, "Forced command set to '%s'", svr_opts.forced_command);
+ }
+
++ if (reexec_fd_arg) {
++ if (m_str_to_uint(reexec_fd_arg, &svr_opts.reexec_childpipe) == DROPBEAR_FAILURE
++ || svr_opts.reexec_childpipe < 0) {
++ dropbear_exit("Bad -2");
++ }
++ }
++
+ #if INETD_MODE
+ if (svr_opts.inetdmode && (
+ opts.usingsyslog == 0