SIPS Errors on Kamailio - sr-users

18 Mar 2022

Hi,

Kamailio / RTPEngine was set up on CentOS 8 running SIP to SIPS and RTP to SDES SRTP
conversion. This worked as expected

Attempted to duplicate the setup on RHEL but errors were seen. These errors were present
on both RHEL 7 / RHEL 8.

The errors seen were as below

kamailio -c
loading modules under config path: /usr/lib64/kamailio/modules/
0(9165) ERROR: tls [tls_init.c:611]: tls_pre_init(): Unable to set the memory allocation
functions
0(9165) ERROR: tls [tls_init.c:613]: tls_pre_init(): libssl current mem functions - m:
0x7f7a77c367a0 r: 0x7f7a77c367f0 f: 0x7f7a77c36770
0(9165) ERROR: tls [tls_init.c:615]: tls_pre_init(): module mem functions - m:
0x7f7a72db7653 r: 0x7f7a72db769f f: 0x7f7a72db76fc
0(9165) ERROR: tls [tls_init.c:617]: tls_pre_init(): Be sure tls module is loaded before
any other module using libssl (can be loaded first to be safe)
0(9165) ERROR: <core> [core/sr_module.c:590]: load_module():
/usr/lib64/kamailio/modules/tls.so: mod_register failed
0(9165) CRITICAL: <core> [core/cfg.y:3683]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 137, column 12-19: failed to load module
0(9165) INFO: pv [pv_shv.c:60]: shvar_init_locks(): locks array size 16
0(9165) ERROR: <core> [core/modparam.c:181]: set_mod_param_regex(): No module
matching <tls> found
0(9165) CRITICAL: <core> [core/cfg.y:3686]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 249, column 72: Can't set module parameter
0(9165) ERROR: <core> [core/modparam.c:181]: set_mod_param_regex(): No module
matching <tls> found
0(9165) CRITICAL: <core> [core/cfg.y:3686]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 250, column 72: Can't set module parameter
0(9165) ERROR: <core> [core/modparam.c:181]: set_mod_param_regex(): No module
matching <tls> found
0(9165) CRITICAL: <core> [core/cfg.y:3686]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 251, column 68: Can't set module parameter
0(9165) ERROR: <core> [core/modparam.c:181]: set_mod_param_regex(): No module
matching <tls> found
0(9165) CRITICAL: <core> [core/cfg.y:3686]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 256, column 39: Can't set module parameter
ERROR: bad config file (5 errors) (parsing code: 0)
0(9165) INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not
initialized

The kamailio config was exactly the same as on the CentOS systems and started as below

/* Server ports: */
#!substdef "!SIP_PORT!5060!g"
#!substdef "!SIPS_PORT!5061!g"

/* Listen addresses */
#!substdef "!UDP_LOCAL_ADDR!udp:SERVER_IP_ADDR:SIP_PORT!g"
#!substdef "!TCP_LOCAL_ADDR!tcp:SERVER_IP_ADDR:SIPS_PORT!g"

/* Server connections: */
#!ifndef MAX_CONNECTIONS
#!define MAX_CONNECTIONS 8192
#!endif

##!define WITH_DEBUG

/* Transaction and branch flags:
      FLT_ - per transaction (message) flags
      FLB_ - per branch flags
*/
#!define FLT_ACC 1
#!define FLT_ACCMISSED 2
#!define FLT_ACCFAILED 3
#!define FLT_NATS 5
#!define FLT_OUT 8
#!define FLB_NATB 6
#!define FLB_NATSIPPING 7

#!define KAMAILIODBURL1 "mysql://kamailio:kamailiorw@localhost/kamailio"

#!define WITH_TLS
enable_tls=1
listen=tls:<ipaddr>:5062

####### Global Parameters #########
### LOG Levels: ALERT=-5, BUG=-4, CRIT=-3, ERR=-1, WARN=0, NOTICE=1, INFO=2, DBG=3
#!ifdef WITH_DEBUG
debug=4
log_stderror=no
#!else
debug=2
log_stderror=no
#!endif

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

/* display memory usage on exit */
mem_summary=15

/* join free memory fragments */
mem_join=1

/* proxy will fork and run in daemon mode */
/* one process will be created for each network interface the proxy listens to and for
each protocol (TCP/UDP), multiplied with the value of 'children' parameter */
fork=yes
children=8

listen=TCP_LOCAL_ADDR
listen=UDP_LOCAL_ADDR

/* life time of TCP connection when there is no traffic
   - a bit higher than registration expires to cope with UA behind NAT */
tcp_connection_lifetime=3605

/* sip over websockets may not specify a content length header */
tcp_accept_no_cl=yes

/* buffer size used for tcp reads, limits the maximum message size (SIP, HTTP) that can be
received over tcp */
tcp_rd_buf_size=65536

/* max number of tcp connections */
tcp_max_connections=MAX_CONNECTIONS

####### Modules Section ########

# set paths to location of modules
mpath="/usr/lib64/kamailio/modules/"

loadmodule "jsonrpcs.so"
loadmodule "db_mysql.so"
loadmodule "kex.so"
loadmodule "corex.so"
loadmodule "tm.so"
loadmodule "tmx.so"
loadmodule "rr.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "usrloc.so"
loadmodule "registrar.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "cfg_rpc.so"
loadmodule "acc.so"
loadmodule "dispatcher.so"
loadmodule "cfgutils.so"
loadmodule "textopsx.so"
loadmodule "nathelper.so"

loadmodule "uac.so"
loadmodule "ipops.so"
loadmodule "debugger.so"
loadmodule "exec.so"
loadmodule "avpops.so"
loadmodule "sqlops.so"
loadmodule "rtpengine.so"

loadmodule "sl.so"
loadmodule "tls.so"

# ----------------- setting module-specific parameters ---------------

# ----- usrloc params -----
# store contacts in memory only
modparam("usrloc", "db_mode", 0)
# hash size of 16,384
modparam("usrloc", "hash_size", 14)
# removes contact if ws disconnects
modparam("usrloc", "handle_lost_tcp", 1)
modparam("tm|usrloc", "xavp_contact", "ulattrs")

# ----- jsonrpcs params -----
modparam("jsonrpcs", "fifo_name",
"/tmp/kamailio_jsonrpc.fifo")
modparam("jsonrpcs", "dgram_socket",
"/tmp/kamailio_rpc.sock")

# ----- tm params -----
# auto-discard branches from previous serial forking leg
modparam("tm", "failure_reply_mode", 3)
# default retransmission timeout: 30sec
modparam("tm", "fr_timer", 30000)
#default invite retransmission timeout after 1xx: 120sec
modparam("tm", "fr_inv_timer", 120000)

# ----- rr params -----
# set next param to 1 to add value to ;lr param (helps with some UAs)
modparam("rr", "enable_full_lr", 0)
# do not append from tag to the RR (no need for this script)
modparam("rr", "append_fromtag", 0)

# ----- uac params -----
modparam("uac", "restore_mode", "none")

# ----- registrar params -----
modparam("registrar", "method_filtering", 1)
modparam("registrar", "max_contacts", 1)
# max value for expires of registrations
modparam("registrar", "max_expires", 3600)
# disable GRUU
modparam("registrar", "gruu_enabled", 0)

# ----- acc params -----
/* what special events should be accounted? */
modparam("acc", "early_media", 0)
modparam("acc", "report_ack", 0)
modparam("acc", "report_cancels", 0)
/* by default ww do not adjust the direction of the sequential requests.
   if you enable this parameter, be sure the enable "append_fromtag"
   in "rr" module */
modparam("acc", "detect_direction", 0)
/* account triggers (flags) */
modparam("acc", "log_flag", FLT_ACC)
modparam("acc", "log_missed_flag", FLT_ACCMISSED)
modparam("acc", "log_extra",
"src_user=$fU;src_domain=$fd;src_ip=$si;dst_ouser=$tU;dst_user=$rU;dst_domain=$rd")
modparam("acc", "failed_transaction_flag", FLT_ACCFAILED)

# ----- dispatcher params -----
modparam("dispatcher", "db_url", KAMAILIODBURL1)
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "ds_ping_method", "OPTIONS")
modparam("dispatcher", "ds_ping_from",
"sip:<address>.com")

modparam("dispatcher", "ds_ping_interval", 5)
modparam("dispatcher", "ds_probing_threshold", 1)
modparam("dispatcher", "ds_inactive_threshold", 1)
modparam("dispatcher", "ds_probing_mode", 3)

# ----- pv params -----
modparam("pv", "shvset", "maintenance=i:0")
modparam("pv", "shvset", "virtualIP1=i:0")
modparam("pv", "shvset", "virtualIP2=i:0")

# ----- nathelper params -----
modparam("nathelper|registrar", "received_avp",
"$avp(RECEIVED)")
# Note: leaving NAT pings turned off here as nathelper is only being used for
#       WebSocket connections. NAT pings are not needed as WebSockets have
#       their own keep-alives.

# ----- rtpengine params -----
modparam("rtpengine", "rtpengine_sock",
"udp:localhost:2223")

modparam("rtpengine", "rtpengine_sock",
"udp:localhost:2223")
#modparam("rtpengine", "write_sdp_pv", "$avp(sdp)")

#modparam("rtpengine", "force_send_interface", SERVER_IP_ADDR)
#modparam("rtpengine", "setid_default", -1)
#modparam("rtpengine", "rtp_inst_pvar", "$avp(RTPENGINE)")
#modparam("rtpengine", "rtpengine_retr", 5)
#modparam("rtpengine", "queried_nodes_limit", 5)
#modparam("rtpengine", "rtpengine_allow_op", 1)
#modparam("rtpengine", "hash_table_size", MAX_CONNECTIONS)
#modparam("rtpengine", "hash_table_tout", 7200)

modparam("tls", "private_key", "<cert path>")
modparam("tls", "certificate", "<cert path>")
modparam("tls", "ca_list", "<cert path>")

# modparam("tls", "ca_list", "<cert path>")

modparam("tls", "tls_method", "TLSv1+")

####### Routing Logic ########

If load module lines for TLS are move to near the top of the config file, config will
parse and non-SIPS calls will work
loadmodule "sl.so"
loadmodule "tls.so"

But logs will show
WARNING: <core> [main.c:2985]: main(): tls support enabled, but no tls engine 
available (forgot to load the tls module?)
WARNING: <core> [main.c:2987]: main(): disabling tls...

Presumably loading the module before configuring it just gives it default values so the
latter config is ignored

Any advice on the matter would be appreciated

Thanks in advance,
Chris