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authorKevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>2019-09-30 10:41:28 +0100
committerKevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>2020-04-05 10:56:52 +0100
commit82df192a010418fac9c4db440490290f55f7e157 (patch)
treebb8895b3f09b61de6f1f499a619822c4b0abd367 /package/network/services/dropbear/patches
parent1c6143e4a0a7cfd9721d74b0194aabd9a5a6cff4 (diff)
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dropbear: backport add ip address to exit without auth messages
201e359 Handle early exit when addrstring isn't set fa4c464 Improve address logging on early exit messages (#83) Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Diffstat (limited to 'package/network/services/dropbear/patches')
-rw-r--r--package/network/services/dropbear/patches/010-backport-change-address-logging.patch119
1 files changed, 119 insertions, 0 deletions
diff --git a/package/network/services/dropbear/patches/010-backport-change-address-logging.patch b/package/network/services/dropbear/patches/010-backport-change-address-logging.patch
new file mode 100644
index 0000000000..2b99f81ad5
--- /dev/null
+++ b/package/network/services/dropbear/patches/010-backport-change-address-logging.patch
@@ -0,0 +1,119 @@
+From c153b3612b7c9f24a0f5af43618a646545ed6e22 Mon Sep 17 00:00:00 2001
+From: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+Date: Mon, 30 Sep 2019 12:42:13 +0100
+Subject: [PATCH] Improve address logging on early exit messages
+
+Change 'Early exit' and 'Exit before auth' messages to include the IP
+address & port as part of the message.
+
+This allows log scanning utilities such as 'fail2ban' to obtain the
+offending IP address as part of the failure event instead of extracting
+the PID from the message and then scanning the log again for match
+'child connection from' messages
+
+Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+---
+ svr-auth.c | 18 +++++++-----------
+ svr-session.c | 20 ++++++++++++++------
+ 2 files changed, 21 insertions(+), 17 deletions(-)
+
+--- a/svr-auth.c
++++ b/svr-auth.c
+@@ -241,8 +241,7 @@ static int checkusername(const char *use
+ }
+
+ if (strlen(username) != userlen) {
+- dropbear_exit("Attempted username with a null byte from %s",
+- svr_ses.addrstring);
++ dropbear_exit("Attempted username with a null byte");
+ }
+
+ if (ses.authstate.username == NULL) {
+@@ -252,8 +251,7 @@ static int checkusername(const char *use
+ } else {
+ /* check username hasn't changed */
+ if (strcmp(username, ses.authstate.username) != 0) {
+- dropbear_exit("Client trying multiple usernames from %s",
+- svr_ses.addrstring);
++ dropbear_exit("Client trying multiple usernames");
+ }
+ }
+
+@@ -268,8 +266,7 @@ static int checkusername(const char *use
+ if (!ses.authstate.pw_name) {
+ TRACE(("leave checkusername: user '%s' doesn't exist", username))
+ dropbear_log(LOG_WARNING,
+- "Login attempt for nonexistent user from %s",
+- svr_ses.addrstring);
++ "Login attempt for nonexistent user");
+ ses.authstate.checkusername_failed = 1;
+ return DROPBEAR_FAILURE;
+ }
+@@ -279,9 +276,8 @@ static int checkusername(const char *use
+ if (!(DROPBEAR_SVR_MULTIUSER && uid == 0) && uid != ses.authstate.pw_uid) {
+ TRACE(("running as nonroot, only server uid is allowed"))
+ dropbear_log(LOG_WARNING,
+- "Login attempt with wrong user %s from %s",
+- ses.authstate.pw_name,
+- svr_ses.addrstring);
++ "Login attempt with wrong user %s",
++ ses.authstate.pw_name);
+ ses.authstate.checkusername_failed = 1;
+ return DROPBEAR_FAILURE;
+ }
+@@ -440,8 +436,8 @@ void send_msg_userauth_failure(int parti
+ } else {
+ userstr = ses.authstate.pw_name;
+ }
+- dropbear_exit("Max auth tries reached - user '%s' from %s",
+- userstr, svr_ses.addrstring);
++ dropbear_exit("Max auth tries reached - user '%s'",
++ userstr);
+ }
+
+ TRACE(("leave send_msg_userauth_failure"))
+--- a/svr-session.c
++++ b/svr-session.c
+@@ -149,28 +149,36 @@ void svr_session(int sock, int childpipe
+ void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
+ char exitmsg[150];
+ char fullmsg[300];
++ char fromaddr[60];
+ int i;
+
+ /* Render the formatted exit message */
+ vsnprintf(exitmsg, sizeof(exitmsg), format, param);
+
++ /* svr_ses.addrstring may not be set for some early exits, or for
++ the listener process */
++ fromaddr[0] = '\0';
++ if (svr_ses.addrstring) {
++ snprintf(fromaddr, sizeof(fromaddr), " from <%s>", svr_ses.addrstring);
++ }
++
+ /* Add the prefix depending on session/auth state */
+ if (!ses.init_done) {
+ /* before session init */
+- snprintf(fullmsg, sizeof(fullmsg), "Early exit: %s", exitmsg);
++ snprintf(fullmsg, sizeof(fullmsg), "Early exit%s: %s", fromaddr, exitmsg);
+ } else if (ses.authstate.authdone) {
+ /* user has authenticated */
+ snprintf(fullmsg, sizeof(fullmsg),
+- "Exit (%s): %s",
+- ses.authstate.pw_name, exitmsg);
++ "Exit (%s)%s: %s",
++ ses.authstate.pw_name, fromaddr, exitmsg);
+ } else if (ses.authstate.pw_name) {
+ /* we have a potential user */
+ snprintf(fullmsg, sizeof(fullmsg),
+- "Exit before auth (user '%s', %u fails): %s",
+- ses.authstate.pw_name, ses.authstate.failcount, exitmsg);
++ "Exit before auth%s: (user '%s', %u fails): %s",
++ fromaddr, ses.authstate.pw_name, ses.authstate.failcount, exitmsg);
+ } else {
+ /* before userauth */
+- snprintf(fullmsg, sizeof(fullmsg), "Exit before auth: %s", exitmsg);
++ snprintf(fullmsg, sizeof(fullmsg), "Exit before auth%s: %s", fromaddr, exitmsg);
+ }
+
+ dropbear_log(LOG_INFO, "%s", fullmsg);