Add SASL SCRAM option

 Patch by: michaelortmann

This PR implements SASL_MECHANISM_SCRAM_SHA_256 and SASL_MECHANISM_SCRAM_SHA_512, and handles 908 messages.

Author: michaelortmann

eggdrop.conf

@@ -1113,12 +1113,18 @@ server add ssl.example.net +7000
 #   1 = ECDSA-NIST256P-CHALLENGE    (Uses a certificate; usually requires a
 #                                    public key to be registered with NickServ
 #                                    or other similar service. Set certificate
-#                                    to use in sasl-ecdsa-key setting below)
+#                                    to use in sasl-ecdsa-key setting below.
+#                                    Beware: NIST curve could be backdoored,
+#                                    so please use EXTERNAL or SCRAM instead.)
 #
 #   2 = EXTERNAL                    (Some other method you set up. Certificates
 #                                    used are defined in ssl-certificate and
 #                                    ssl-privatekey settings in SSL section)
 #
+#   3 = SCRAM-SHA-256
+#
+#   4 = SCRAM-SHA-512
+#
 #set sasl-mechanism 0
 
 # Set username to authenticate to IRC NickServ with

src/mod/server.mod/Makefile

@@ -40,5 +40,5 @@ distclean: clean
  .././server.mod/server.h .././server.mod/isupport.c \
  .././server.mod/tclisupport.c .././server.mod/servmsg.c \
  .././server.mod/../irc.mod/irc.h \
- .././server.mod/../channels.mod/channels.h .././server.mod/cmdsserv.c \
- .././server.mod/tclserv.c
+ .././server.mod/../channels.mod/channels.h .././server.mod/sasl.c \
+ .././server.mod/cmdsserv.c .././server.mod/tclserv.c