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rules.pbest
executable file
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rules.pbest
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```````````````````````````````````````````````````````````````````
` EMERALD mobiflow Sample File
```````````````````````````````````````````````````````````````````
{
/******************* C Variables *******************/
#define _Mobiflow_
#include "strings.h"
#include <stdlib.h>
#include <stdarg.h>
#include <sys/time.h>
int DEBUG = 1;
int VERBOSE = 0;
int Report_ID_Tag = 1;
int UE_EXPIRE_TIME = 30000;
int BS_EXPIRE_TIME = 30000;
int EVENT_EXPIRE_TIME = 600000;
int UE_SESSION_EXPIRE_TIME = 30000;
int TMSI_EXPIRE_TIME = 3600000;
int BTS_DEPLETION_UE_THRESHOLD = 2;
int BTS_DEPLETION_TRANSIENT_TIME_THRESHOLD = 7000;
int BTS_DEPLETION_RELEASE_TIME_THRESHOLD = 10000;
int BTS_DEPLETION_EVENT_EXPIRE_TIME = 30000;
int BTS_DEPLETION_REG_INIT_TIME_THRESHOLD = 1000;
int ptype_cntr = 0;
int event_id_cntr = 0;
int ue_session_id_cntr = 0;
int UE_MSG_TRACK_COUNTER = 5;
int UNSOLICITED_MSG_EVENT_EXPIRE_TIME = 10000;
/******************* C Utility Functions *******************/
int verboseprintf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
if (VERBOSE) {
printf("[VERBOSE] ");
vprintf(fmt, args);
fflush (stdout);
}
va_end(args);
return 0;
}
int debugprintf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
if (DEBUG) {
printf("[DEBUG] ");
vprintf(fmt, args);
fflush (stdout);
}
va_end(args);
return 0;
}
int eventprintf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
printf("[EVENT] ");
vprintf(fmt, args);
fflush (stdout);
va_end(args);
return 0;
}
int eventprintfjson(int id, const char *name, int bs, double ts, int ue) {
if (strcmp(name, "BTS Resource Depletion") == 0)
printf("[EVENT]{\"Event ID\": %d, \"Event Name\": \"%s\", \"Affected base station ID\": %d, \"Time\": %f, \"Number of DoS UE\": %d}\n", id, name, bs, ts, ue);
else
printf("[EVENT]{\"Event ID\": %d, \"Event Name\": \"%s\", \"Affected base station ID\": %d, \"Time\": %f, \"Affected UE ID\": %d}\n", id, name, bs, ts, ue);
}
}
```````````````````````````````````````````````````````````````````
` S T A R T P B E S T D E C L A R A T I O N S
```````````````````````````````````````````````````````````````````
```````````````````````````````````````````````````````````````````
`` Local C Variable declarations
```````````````````````````````````````````````````````````````````
`` control variables
xtype[DEBUG: int]
xtype[VERBOSE: int]
xtype[Banner: string]
xtype[Report_ID_Tag: int]
`` administrative rules
xtype[event_id_cntr: int]
xtype[ue_session_id_cntr: int]
xtype[ptype_cntr: int]
xtype[UE_MSG_TRACK_COUNTER: int]
xtype[UE_EXPIRE_TIME: int]
xtype[BS_EXPIRE_TIME: int]
xtype[EVENT_EXPIRE_TIME: int]
xtype[UE_SESSION_EXPIRE_TIME: int]
`` BTS depletion attack detection rules
xtype[BTS_DEPLETION_UE_THRESHOLD: int]
xtype[BTS_DEPLETION_TRANSIENT_TIME_THRESHOLD: int]
xtype[BTS_DEPLETION_RELEASE_TIME_THRESHOLD: int]
xtype[BTS_DEPLETION_EVENT_EXPIRE_TIME: int]
xtype[BTS_DEPLETION_REG_INIT_TIME_THRESHOLD: int]
xtype[TMSI_EXPIRE_TIME: int]
xtype[UNSOLICITED_MSG_EVENT_EXPIRE_TIME: int]
`set[RRCState: 0, 1, 2, 3] `INACTIVE, RRC_IDLE, RRC_CONNECTED, RRC_RECONGIFURED
`set[EmmState: 0, 1, 2] `EMM_REGISTERING, EMM_REGISTERED, EMM_DEREGISTERED
`set[SecState: 0, 1] `SEC_CONTEXT_NOT_EXIST, SEC_CONTEXT_EXIST
````````````````````````````````````````````````````````````````````
`` Local C functions
````````````````````````````````````````````````````````````````````
`` C utility functions
xtype[debugprintf: intfunc]
xtype[verboseprintf: intfunc]
xtype[eventprintf: intfunc]
xtype[eventprintfjson: intfunc]
```````````````````````````````````````````````````````````````````
` PBEST Variable and Fact Declarations
```````````````````````````````````````````````````````````````````
ptype[ue_mobiflow
msg_type: string, `| Msg hdr - mobiflow type [UE, BS]
msg_id:int, `| Msg hdr - unique mobiflow event ID
timestamp:double, `| Msg hdr - timestamp (ms need)
mobiflow_ver:string, `| Msg hdr - version of Mobiflow
generator_name:string, `| Msg hdr - generator name (e.g., SECSM)
`````````````````````````````````````````````````````````
bs_id:int, `| UE meta - basestation id
rnti:int, `| UE meta - basestation type
tmsi:string, `| UE meta - ue mtmsi
imsi:string, `| UE meta - ue imsi
imei:string, `| UE meta - ue imei
`````````````````````````````````````````````````````````
cipher_alg:int, `| UE stats - cipher algorithm
integrity_alg:int, `| UE stats - integrity algorithm
establish_cause:int, `| UE stats - establishment cause
msg:string, `| UE stats - RRC/NAS message
rrc_state:int, `| UE stats - RRC state [INACTIVE, RRC_IDLE, RRC_CONNECTED, RRC_RECONFIGURED]
nas_state:int, `| UE stats - NAS state (EMM) [EMM_DEREGISTERED, EMM_REGISTERING, EMM_REGISTERED]
sec_state:int, `| UE stats - security state [SEC_CONTEXT_NOT_EXIST, SEC_CONTEXT_EXIST]
emm_cause:int, `| UE stats - emm cause code
`````````````````````````````````````````````````````````
rrc_initial_timer:double, `| UE timer -
rrc_inactive_timer:double, `| UE timer -
nas_initial_timer:double, `| UE timer -
nas_inactive_timer:double `| UE timer -
]
ptype[bs_mobiflow
msg_type: string, `| Msg hdr - mobiflow type [UE, BS]
msg_id:int, `| Msg hdr - unique mobiflow event ID
timestamp:double, `| Msg hdr - timestamp (ms need)
mobiflow_ver:string, `| Msg hdr - version of Mobiflow
generator_name:string, `| Msg hdr - generator name (e.g., SECSM)
`````````````````````````````````````````````````````````
bs_id:int, `| BS meta - basestation id
mcc:string, `| BS meta - mobile country code
mnc:string, `| BS meta - mobile network code
tac:string, `| BS meta - tracking area code
cell_id:string, `| BS meta - cell Id
report_period:int, `| BS meta - report period (ms)
`````````````````````````````````````````````````````````
connected_ue_cnt:int, `| BS stats -
idle_ue_cnt:int, `| BS stats -
max_ue_cnt:int, `| BS stats -
`````````````````````````````````````````````````````````
initial_timer:double, `| BS timer -
inactive_timer:double `| BS timer -
]
ptype[maintenance_event ts: double]
ptype[bs_counter value: int]
ptype[ue_counter value: int]
ptype[ts_event value: double]
``BTS_depletion attack
ptype [transient_ue_counter
bs_id: int,
value: int,
ts: double
]
ptype [transient_ue
bs_id: int,
rnti: int,
ts: double
]
ptype [event
id: int,
name: string,
ts: double,
bs_id: int,
ue: int
]
```````````````````````````````````````````````````````````````````
` PBEST Rules
```````````````````````````````````````````````````````````````````
```````````````````````````````````````````````````````````````````````
`` Administrative rule set
`` These rules should be executed first
```````````````````````````````````````````````````````````````````````
rule[INIT_eXpert_on_bs(#99):
[-ue_counter]
[-bs_counter]
[+bs_mobiflow]
==>
[+ue_counter|value=0]
[+bs_counter|value=0]
[+ts_event|value=0]
[!| debugprintf("INIT_eXpert: Initialized\n")]
[-#INIT_eXpert_on_bs]
[-#INIT_eXpert_on_ue]
]
rule[INIT_eXpert_on_ue(#99):
[-ue_counter]
[-bs_counter]
[+ue_mobiflow]
==>
[+ue_counter|value=0]
[+bs_counter|value=0]
[+ts_event|value=0]
[!| debugprintf("INIT_eXpert: Initialized\n")]
[-#INIT_eXpert_on_bs]
[-#INIT_eXpert_on_ue]
]
``````` Maintenance rule sets ``````
rule[add_maintenance_event(#98):
[+m:maintenance_event^ADD_MAINTENANCE_EVENT]
[+ts_ev:ts_event]
==>
[!|verboseprintf("add maintenance event\n")]
[/ts_ev|value = m.ts]
]
rule[release_maintenance_event:
[+m:maintenance_event]
==>
[-|m]
]
``````` BS rule sets ```````
rule[add_bs_mobiflow(#98):
[+bs_mf:bs_mobiflow^ADD_BS_MOBIFLOW]
[+bs_cntr:bs_counter]
==>
[$|bs_mf:ADD_BS_MOBIFLOW]
[/bs_cntr|value += 1]
[!|debugprintf("add_bs_mobiflow: bs_mobiflow_count: %d\n", bs_cntr.value)]
]
rule[bs_mobiflow_update_ts:
[+bs_mf:bs_mobiflow]
[+ts_ev:ts_event]
[?|bs_mf.timestamp > ts_ev.value]
==>
[/ts_ev|value = bs_mf.timestamp]
]
rule[remove_bs_mobiflow:
[+bs_mf:bs_mobiflow]
[+bs_cntr:bs_counter]
[+ts_ev:ts_event]
[?|(ts_ev.value - bs_mf.timestamp) > 'BS_EXPIRE_TIME]
==>
[/bs_cntr|value -= 1]
[!|debugprintf("remove bs mobiflow record: %d\n", bs_mf.msg_id)]
[-|bs_mf]
]
``````` UE rule sets ```````
rule[add_ue_mobiflow(#98):
[+ue_mf:ue_mobiflow^ADD_UE_MOBIFLOW]
[+ue_cntr:ue_counter]
==>
[$|ue_mf:ADD_UE_MOBIFLOW]
[/ue_cntr|value += 1]
[!|debugprintf("add_ue_mobiflow: ue_mobiflow_count: %d\n", ue_cntr.value)]
]
rule[ue_mobiflow_update_ts:
[+ue_mf:ue_mobiflow]
[+ts_ev:ts_event]
[?|ue_mf.timestamp > ts_ev.value]
==>
[/ts_ev|value = ue_mf.timestamp]
]
rule[remove_ue_mobiflow:
[+ue_mf:ue_mobiflow]
[+ue_cntr:ue_counter]
[+ts_ev:ts_event]
[?|(ts_ev.value - ue_mf.timestamp) > 'UE_EXPIRE_TIME]
==>
[!|debugprintf("remove ue mobiflow record: %d\n", ue_mf.msg_id)]
[/ue_cntr|value -= 1]
[-|ue_mf]
]
``````` Event rule sets ```````
rule[remove_event:
[+ev:event]
[+ts_ev:ts_event]
[?|(ts_ev.value - ev.ts) > 'EVENT_EXPIRE_TIME]
==>
[!|debugprintf("remove event: %d\n", ev.id)]
[-|ev]
]
``````` Live UE & RRC/NAS message tracking ```````
ptype[ue_session
id: int,
bs_id: int,
rnti: int,
tmsi: string,
imsi: string,
imei: string,
rrc_state: int,
nas_state: int,
sec_state: int,
msg_count: int,
ts: double
]
ptype[ue_msg
ue_session_id: int,
msg_index: int,
msg: string,
ts: double
]
`` rules for live UE sessions
rule[add_ue_session(#97):
[+ue_mf:ue_mobiflow^UE_SESSION]
[-ue_session|bs_id == ue_mf.bs_id, rnti == ue_mf.rnti]
==>
[+ue_session|id = 'ue_session_id_cntr,
bs_id = ue_mf.bs_id,
rnti = ue_mf.rnti,
tmsi = ue_mf.tmsi,
imsi = ue_mf.imsi,
imei = ue_mf.imei,
rrc_state = ue_mf.rrc_state,
nas_state = ue_mf.nas_state,
sec_state = ue_mf.sec_state,
msg_count = 1,
ts = ue_mf.timestamp
]
[+ue_msg|ue_session_id = 'ue_session_id_cntr,
msg_index = 1,
msg = ue_mf.msg,
ts = ue_mf.timestamp
]
[!|'ue_session_id_cntr += 1]
[!|debugprintf("Add UE session: %d\n", ue_mf.rnti)]
[$|ue_mf:UE_SESSION]
]
rule[update_ue_session(#97):
[+ue_mf:ue_mobiflow^UE_SESSION]
[+session:ue_session|bs_id == ue_mf.bs_id, rnti == ue_mf.rnti]
==>
[+ue_msg|ue_session_id = session.id,
msg_index = session.msg_count + 1,
msg = ue_mf.msg,
ts = ue_mf.timestamp
]
[/session|msg_count += 1,
rrc_state = ue_mf.rrc_state,
nas_state = ue_mf.nas_state,
sec_state = ue_mf.sec_state,
ts = ue_mf.timestamp
]
[!|debugprintf("Update UE session: %d\n", session.rnti)]
[$|ue_mf:UE_SESSION]
]
rule[remove_ue_session:
[+session:ue_session]
[+ts_ev:ts_event]
[?|session.rrc_state < 2 && session.nas_state == 0]
[?|(ts_ev.value - session.ts) > 'UE_SESSION_EXPIRE_TIME]
==>
[!|debugprintf("Remove UE session: %d at BS %d\n", session.rnti, session.bs_id)]
[-|session]
]
`` rules to UE message trace management
rule[remove_ue_msg_1:
[+m:ue_msg]
[-ue_session|id == m.ue_session_id]
==>
[!|verboseprintf("Remove UE msg for expired UE session\n")]
[-|m]
]
rule[remove_ue_msg_2:
[+m:ue_msg]
[+session:ue_session|id == m.ue_session_id]
[?|session.msg_count - m.msg_index >= 'UE_MSG_TRACK_COUNTER]
==>
[!|verboseprintf("Remove UE msg for expired msg counter\n")]
[-|m]
]
```````````````````````````````````````````````````````````````````````
`` BTS resource depletion attack rule set
```````````````````````````````````````````````````````````````````````
rule[bts_depletion_first_transient_ue:
[+ue_mf:ue_mobiflow^TRANSIENT]
[?|ue_mf.rrc_state < 2]
[?|ue_mf.rrc_inactive_timer != 0 && ue_mf.rrc_initial_timer != 0]
[?|(ue_mf.rrc_inactive_timer - ue_mf.rrc_initial_timer) < 'BTS_DEPLETION_TRANSIENT_TIME_THRESHOLD]
[-transient_ue_counter|bs_id == ue_mf.bs_id]
[-transient_ue|bs_id == ue_mf.bs_id, rnti == ue_mf.rnti]
==>
[+transient_ue_counter|bs_id = ue_mf.bs_id, value = 1, ts = ue_mf.timestamp]
[+transient_ue|bs_id = ue_mf.bs_id, rnti = ue_mf.rnti, ts = ue_mf.timestamp]
[$|ue_mf:TRANSIENT]
[!|debugprintf("[BTS Resource Depletion][ADD_FIRST_TRANSIENT_UE] Marking UE %d/%x as transient\n", ue_mf.rnti, ue_mf.rnti)]
[!|debugprintf("[BTS Resource Depletion][ADD_FIRST_TRANSIENT_UE] Transient UE counter of bs %d is %d\n", ue_mf.bs_id, 1)]
]
rule[bts_depletion_add_transient_ue:
[+ue_mf:ue_mobiflow^TRANSIENT]
[?|ue_mf.rrc_state < 2]
[?|ue_mf.rrc_inactive_timer != 0 && ue_mf.rrc_initial_timer != 0]
[?|(ue_mf.rrc_inactive_timer - ue_mf.rrc_initial_timer) < 'BTS_DEPLETION_TRANSIENT_TIME_THRESHOLD]
[+tran_ue_cntr:transient_ue_counter|bs_id == ue_mf.bs_id]
[-transient_ue|bs_id == ue_mf.bs_id, rnti == ue_mf.rnti]
==>
[/tran_ue_cntr|value += 1, ts = ue_mf.timestamp]
[+transient_ue|bs_id = ue_mf.bs_id, rnti = ue_mf.rnti, ts = ue_mf.timestamp]
[$|ue_mf:TRANSIENT]
[!|debugprintf("[BTS Resource Depletion][ADD_TRANSIENT_UE] Marking UE %d/%x as transient\n", ue_mf.rnti, ue_mf.rnti)]
[!|debugprintf("[BTS Resource Depletion][ADD_TRANSIENT_UE] Transient UE counter of bs %d is %d\n", ue_mf.bs_id, tran_ue_cntr.value)]
]
rule[bts_depletion_add_first_transient_ue_5g:
[+s:ue_session^TRANSIENT]
[+ts_ev:ts_event]
[?|s.nas_state == 1] `NAS registering state
[?|ts_ev.value - s.ts > 'BTS_DEPLETION_REG_INIT_TIME_THRESHOLD]
[-transient_ue_counter|bs_id == s.bs_id]
[-transient_ue|bs_id == s.bs_id, rnti == s.rnti]
==>
[+transient_ue_counter|bs_id = s.bs_id, value = 1, ts = s.ts]
[+transient_ue|bs_id = s.bs_id, rnti = s.rnti, ts = s.ts]
[$|s:TRANSIENT]
[!|debugprintf("[BTS Resource Depletion][ADD_FIRST_TRANSIENT_UE_5G] Marking UE %d/%x as transient\n", s.rnti, s.rnti)]
[!|debugprintf("[BTS Resource Depletion][ADD_FIRST_TRANSIENT_UE_5G] Transient UE counter of bs %d is %d\n", s.bs_id, 1)]
]
rule[bts_depletion_add_transient_ue_5g:
[+s:ue_session^TRANSIENT]
[+ts_ev:ts_event]
[?|s.nas_state == 1] `NAS registering state
[?|ts_ev.value - s.ts > 'BTS_DEPLETION_REG_INIT_TIME_THRESHOLD]
[+tran_ue_cntr:transient_ue_counter|bs_id == s.bs_id]
[-transient_ue|bs_id == s.bs_id, rnti == s.rnti]
==>
[/tran_ue_cntr|value += 1, ts = s.ts]
[+transient_ue|bs_id = s.bs_id, rnti = s.rnti, ts = s.ts]
[$|s:TRANSIENT]
[!|debugprintf("[BTS Resource Depletion][ADD_TRANSIENT_UE_5G] Marking UE %d/%x as transient\n", s.rnti, s.rnti)]
[!|debugprintf("[BTS Resource Depletion][ADD_TRANSIENT_UE_5G] Transient UE counter of bs %d is %d\n", s.bs_id, tran_ue_cntr.value)]
]
rule[bts_depletion_release_transient_ue:
[+tran_ue:transient_ue]
[+tran_ue_cntr:transient_ue_counter|bs_id == tran_ue.bs_id]
[+ts_ev:ts_event]
[?|(ts_ev.value - tran_ue.ts) > 'BTS_DEPLETION_RELEASE_TIME_THRESHOLD]
==>
[/tran_ue_cntr|value -= 1]
[-|tran_ue]
[!|debugprintf("[BTS Resource Depletion][RELEASE_TRANSIENT_UE] Removing transient UE %d/%x\n", tran_ue.rnti, tran_ue.rnti)]
]
rule[bts_depletion_generate_event:
[+tran_ue_cntr: transient_ue_counter^BTS_RESOURCE_DEPLETION]
[?|tran_ue_cntr.value > 'BTS_DEPLETION_UE_THRESHOLD]
==>
[$|tran_ue_cntr: BTS_RESOURCE_DEPLETION]
[+event|id = 'event_id_cntr,
name = "BTS Resource Depletion",
ts = tran_ue_cntr.ts,
bs_id = tran_ue_cntr.bs_id,
ue = 0
]
[!|'event_id_cntr += 1 ]
[!|debugprintf("[BTS Resource Depletion][GENERATE_EVENT] Event detected for bs %d\n", tran_ue_cntr.bs_id)]
[!|eventprintfjson('event_id_cntr, "BTS Resource Depletion", tran_ue_cntr.bs_id, tran_ue_cntr.ts, tran_ue_cntr.value)]
]
rule[bts_depletion_release_event:
[+e:event]
[+ts_ev:ts_event]
[?|strcmp(e.name, "BTS Resource Depletion") == 0]
[?|(ts_ev.value - e.ts) > 'BTS_DEPLETION_EVENT_EXPIRE_TIME]
[+tran_ue_cntr:transient_ue_counter|bs_id == e.bs_id]
==>
[!|debugprintf("[BTS Resource Depletion][RELEASE_EVENT] Removing event for bs %d\n", e.bs_id)]
[-|e]
[^|tran_ue_cntr:BTS_RESOURCE_DEPLETION]
]
```````````````````````````````````````````````````````````````````````
`` Blind DoS attack (RRC_Connection_Request) rule set
```````````````````````````````````````````````````````````````````````
rule[blind_dos_detect:
[+ue_mf:ue_mobiflow]
[+ue1:ue_session]
[+ue2:ue_session^BLIND_DOS]
[?|ue2.bs_id == ue1.bs_id && ue2.rnti != ue1.rnti]
[?|ue1.rrc_state > 1 && ue2.rrc_state > 1]
[?|ue2.ts > ue1.ts]
[?|strcmp(ue2.tmsi, "0") != 0]
[?|strcmp(ue2.tmsi, ue1.tmsi) == 0]
==>
[+event|id = 'event_id_cntr,
name = "Blind DoS",
ts = ue2.ts,
bs_id = ue2.bs_id,
ue = ue2.rnti
]
[!|'event_id_cntr += 1]
[$|ue2:BLIND_DOS]
[!|debugprintf("[Blind DoS][GENERATE_EVENT] Event detected for bs %d\n", ue2.bs_id)]
[!|eventprintfjson('event_id_cntr, "Blind DoS", ue2.bs_id, ue2.ts, ue2.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` IMSI exposure detection rule set
```````````````````````````````````````````````````````````````````````
rule[imsi_extractor_detection:
[+ue_mf:ue_mobiflow^IMSI_EXPOSURE]
[?|strcmp(ue_mf.msg, "IDENTITY_RESPONSE") == 0]
[?|ue_mf.sec_state == 0 || ue_mf.cipher_alg == 0]
==>
[+event|id = 'event_id_cntr,
name = "IMSI Exposure",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:IMSI_EXPOSURE]
[!|debugprintf("[IMSI Exposure][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
]
```````````````````````````````````````````````````````````````````````
`` Null cipher detection rule set
```````````````````````````````````````````````````````````````````````
rule[null_cipher_detection_1:
[+ue_mf:ue_mobiflow^NULL_CIPHER]
[?|strcmp(ue_mf.msg, "SecurityModeComplete") == 0]
[?|ue_mf.sec_state == 1]
[?|ue_mf.cipher_alg == 0]
==>
[+event|id = 'event_id_cntr,
name = "Null Cipher",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:NULL_CIPHER]
[!|debugprintf("[Null Cipher][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
`[!|eventprintfjson('event_id_cntr, "Null Cipher", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
rule[null_cipher_detection_2:
[+ue_mf:ue_mobiflow^NULL_CIPHER]
[?|strcmp(ue_mf.msg, "SecurityModeFailure") == 0]
[?|ue_mf.sec_state == 0]
[?|ue_mf.cipher_alg == 0]
==>
[+event|id = 'event_id_cntr,
name = "Null Cipher",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:NULL_CIPHER]
[!|debugprintf("[Null Cipher][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
`[!|eventprintfjson('event_id_cntr, "Null Cipher", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` Null integrity detection rule set
```````````````````````````````````````````````````````````````````````
rule[null_integrity_detection_1:
[+ue_mf:ue_mobiflow^NULL_INTEGRITY]
[?|strcmp(ue_mf.msg, "SecurityModeComplete") == 0]
[?|ue_mf.sec_state == 1]
[?|ue_mf.integrity_alg == 0]
==>
[+event|id = 'event_id_cntr,
name = "Null Integrity",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:NULL_INTEGRITY]
[!|debugprintf("[Null Integrity][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
`[!|eventprintfjson('event_id_cntr, "Null Integrity", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
rule[null_integrity_detection_2:
[+ue_mf:ue_mobiflow^NULL_INTEGRITY]
[?|strcmp(ue_mf.msg, "SecurityModeFailure") == 0]
[?|ue_mf.sec_state == 0]
[?|ue_mf.integrity_alg == 0]
==>
[+event|id = 'event_id_cntr,
name = "Null Integrity",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:NULL_INTEGRITY]
[!|debugprintf("[Null Integrity][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
`[!|eventprintfjson('event_id_cntr, "Null Integrity", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` Overshadowing: Uplink IMSI extractor
```````````````````````````````````````````````````````````````````````
`` TMSI record management
ptype[tmsi_record
bs_id: int,
tmsi: string,
ts: double
]
rule[add_tmsi_record:
[+ue_mf:ue_mobiflow^TMSI_RECORD]
[?|strcmp(ue_mf.msg, "ATTACH_COMPLETE") == 0] `` add TMSI only when the NAS session is established
[?|strcmp(ue_mf.tmsi, "0") != 0]
[-tmsi_record|bs_id == ue_mf.bs_id && strcmp(ue_mf.tmsi, tmsi) == 0]
==>
[!|debugprintf("[ADD_TMSI_RECORD] TMSI %s added at BS %d\n", ue_mf.tmsi, ue_mf.bs_id)]
[$|ue_mf:TMSI_RECORD]
[+tmsi_record|bs_id = ue_mf.bs_id,
tmsi = ue_mf.tmsi,
ts = ue_mf.timestamp
]
]
rule[release_tmsi_record:
[+tmsi_rec:tmsi_record]
[+ts_ev:ts_event]
[?|(ts_ev.value - tmsi_rec.ts) > 'TMSI_EXPIRE_TIME]
==>
[-|tmsi_rec]
]
rule[uplink_imsi_extractor:
[+m2:ue_msg^UPLINK_IMSI_EXTRACTOR]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[?|strcmp(m2.msg, "IDENTITY_REQUEST") == 0]
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1]
[?|strcmp(m1.msg, "ATTACH_REQUEST") == 0] ` the previous message is attach request
[-tmsi_record|bs_id == session.bs_id && strcmp(tmsi, session.tmsi) == 0] `` check if the UE TMSI is unknown to network
==>
[+event|id = 'event_id_cntr,
name = "Uplink IMSI Extractor",
ts = m2.ts,
bs_id = session.bs_id,
ue = session.rnti
]
[!|'event_id_cntr += 1 ]
[$|m2:UPLINK_IMSI_EXTRACTOR]
[!|debugprintf("[Uplink IMSI Extractor][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[!|eventprintfjson('event_id_cntr, "Uplink IMSI Extractor", session.bs_id, m2.ts, session.rnti)]
]
rule[uplink_imsi_extractor_5g:
[+m2:ue_msg^UPLINK_IMSI_EXTRACTOR]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[?|strcmp(m2.msg, "Identityrequest") == 0]
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1]
[?|strcmp(m1.msg, "Registrationrequest") == 0] ` the previous message is registration request
[-tmsi_record|bs_id == session.bs_id && strcmp(tmsi, session.tmsi) == 0] `` check if the UE TMSI is unknown to network
==>
[+event|id = 'event_id_cntr,
name = "Uplink IMSI Extractor",
ts = m2.ts,
bs_id = session.bs_id,
ue = session.rnti
]
[!|'event_id_cntr += 1 ]
[$|m2:UPLINK_IMSI_EXTRACTOR]
[!|debugprintf("[Uplink IMSI Extractor 5G][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[!|eventprintfjson('event_id_cntr, "Uplink IMSI Extractor", session.bs_id, m2.ts, session.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` Overshadowing: Downlink IMSI extractor: checking unsolicited control messages
```````````````````````````````````````````````````````````````````````
rule[downlink_imsi_extractor:
[+m2:ue_msg^DOWNLINK_IMSI_EXTRACTOR]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[?|strcmp(m2.msg, "IDENTITY_RESPONSE") == 0]
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1]
[?|strcmp(m1.msg, "IDENTITY_REQUEST") != 0] ` the previous message is not identity_request
==>
[+event|id = 'event_id_cntr,
name = "Downlink IMSI Extractor",
ts = m2.ts,
bs_id = session.bs_id,
ue = session.rnti
]
[!|'event_id_cntr += 1 ]
[$|m2:DOWNLINK_IMSI_EXTRACTOR]
[!|debugprintf("[Downlink IMSI Extractor][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[!|eventprintfjson('event_id_cntr, "Downlink IMSI Extractor", session.bs_id, m2.ts, session.rnti)]
]
rule[downlink_imsi_extractor_5g:
[+m2:ue_msg^DOWNLINK_IMSI_EXTRACTOR]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[?|strcmp(m2.msg, "Identityresponse") == 0]
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1]
[?|strcmp(m1.msg, "Identityrequest") != 0] ` the previous message is not identity_request
==>
[+event|id = 'event_id_cntr,
name = "Downlink IMSI Extractor",
ts = m2.ts,
bs_id = session.bs_id,
ue = session.rnti
]
[!|'event_id_cntr += 1 ]
[$|m2:DOWNLINK_IMSI_EXTRACTOR]
[!|debugprintf("[Downlink IMSI Extractor 5G][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[!|eventprintfjson('event_id_cntr, "Downlink IMSI Extractor", session.bs_id, m2.ts, session.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` Overshadowing: Uplink DoS
```````````````````````````````````````````````````````````````````````
rule[uplink_dos_service_request:
[+ue_mf:ue_mobiflow^UPLINK_DOS_SERVICE_REQUEST]
[?|strcmp(ue_mf.msg, "SERVICE_REJECT") == 0]
[?|ue_mf.emm_cause == 9]
==>
[+event|id = 'event_id_cntr,
name = "Uplink DoS Service Request",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:UPLINK_DOS_SERVICE_REQUEST]
[!|debugprintf("[Uplink DoS Service Request][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
[!|eventprintfjson('event_id_cntr, "Uplink DoS Service Request", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
rule[uplink_dos_attach_request:
[+ue_mf:ue_mobiflow^UPLINK_DOS_ATTACH_REQUEST]
[?|strcmp(ue_mf.msg, "ATTACH_REJECT") == 0]
[?|ue_mf.emm_cause == 9]
==>
[+event|id = 'event_id_cntr,
name = "Uplink DoS Attach Request",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
[!|'event_id_cntr += 1 ]
[$|ue_mf:UPLINK_DOS_ATTACH_REQUEST]
[!|debugprintf("[Uplink DoS Attach Request][GENERATE_EVENT] Event detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
[!|eventprintfjson('event_id_cntr, "Uplink DoS Attach Request", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
]
``` New rules of variants
```````````````````````````````````````````````````````````````````````
`` Downlink Overshadowing (Variants): checking unsolicited control messages
```````````````````````````````````````````````````````````````````````
ptype[unsolicited_msg_event
bs_id: int,
ue_rnti: int,
msg: string,
resp: string,
ts: double
]
rule[remove_unsolicited_msg_event:
[+unsol_msg_ev:unsolicited_msg_event]
[+ts_ev:ts_event]
[?|(ts_ev.value - unsol_msg_ev.ts) > 'UNSOLICITED_MSG_EVENT_EXPIRE_TIME]
==>
`[!|debugprintf("Remove unsolicited msg event for UE %d msg %s\n", unsol_msg_ev.rnti, unsol_msg_ev.msg)]
[-|unsol_msg_ev]
]
rule[unsolicited_auth_request_response:
[+m2:ue_msg^UNSOLICITED_AUTH_REQUEST_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "AUTHENTICATION_REQUEST") == 0] `` m1 is auth_request
[?|strcmp(m2.msg, "AUTHENTICATION_RESPONSE") != 0 && strcmp(m2.msg, "AUTHENTICATION_FAILURE") != 0] `` m2 is neither auth_response or auth_failure
==>
[$|m2:UNSOLICITED_AUTH_REQUEST_RESPONSE]
[!|debugprintf("[Unsolicited Response of AUTH_REQUEST][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_auth_request_response_5g:
[+m2:ue_msg^UNSOLICITED_AUTH_REQUEST_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "Authenticationrequest") == 0] `` m1 is auth_request
[?|strcmp(m2.msg, "Authenticationresponse") != 0 && strcmp(m2.msg, "Authenticationfailure") != 0] `` m2 is neither auth_response or auth_failure
==>
[$|m2:UNSOLICITED_AUTH_REQUEST_RESPONSE]
[!|debugprintf("[Unsolicited Response of AUTH_REQUEST][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_sec_mode_cmd_response:
[+m2:ue_msg^UNSOLICITED_SEC_MODE_CMD_NAS_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "SECURITY_MODE_COMMAND") == 0] `` m1 is sec_mode_cmd
[?|strcmp(m2.msg, "SECURITY_MODE_COMPLETE") != 0 && strcmp(m2.msg, "SECURITY_MODE_REJECT") != 0 && strcmp(m2.msg, "ULInformationTransfer") != 0] `` m2 is neither sec_mode_complete nor sec_mode_reject nor ulInfoTransfer (encrypted)
==>
[$|m2:UNSOLICITED_SEC_MODE_CMD_NAS_RESPONSE]
[!|debugprintf("[Unsolicited Response of SEC_MODE_CMD (NAS)][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_sec_mode_cmd_response_5g:
[+m2:ue_msg^UNSOLICITED_SEC_MODE_CMD_NAS_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "Securitymodecommand") == 0] `` m1 is sec_mode_cmd
[?|strcmp(m2.msg, "Securitymodecomplete") != 0 && strcmp(m2.msg, "Securitymodereject") != 0 && strcmp(m2.msg, "ULInformationTransfer") != 0] `` m2 is neither sec_mode_complete nor sec_mode_reject nor ulInfoTransfer (encrypted)
==>
[$|m2:UNSOLICITED_SEC_MODE_CMD_NAS_RESPONSE]
[!|debugprintf("[Unsolicited Response of SEC_MODE_CMD (NAS)][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_attach_accept_response:
[+m2:ue_msg^UNSOLICITED_ATTACH_ACCEPT_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 2] `` m2 is the next two message of m1
[?|strcmp(m1.msg, "ATTACH_ACCEPT") == 0] `` m1 is attach_accept
[?|strcmp(m2.msg, "ATTACH_COMPLETE") != 0] `` m2 is not attach_complete
==>
[$|m2:UNSOLICITED_ATTACH_ACCEPT_RESPONSE]
[!|debugprintf("[Unsolicited Response of ATTACH_ACCEPT][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_registration_accept_response_5g:
[+m2:ue_msg^UNSOLICITED_ATTACH_ACCEPT_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 2] `` m2 is the next two message of m1
[?|strcmp(m1.msg, "Registrationaccept") == 0] `` m1 is attach_accept
[?|strcmp(m2.msg, "Registrationcomplete") != 0] `` m2 is not attach_complete
==>
[$|m2:UNSOLICITED_ATTACH_ACCEPT_RESPONSE]
[!|debugprintf("[Unsolicited Response of REGISTRATION_ACCEPT_5G][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[unsolicited_sec_mode_cmd_rrc_response:
[+m2:ue_msg^UNSOLICITED_SEC_MODE_CMD_RRC_RESPONSE]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "SecurityModeCommand") == 0] `` m1 is sec_mode_cmd
[?|strcmp(m2.msg, "SecurityModeComplete") != 0 && strcmp(m2.msg, "SecurityModeFailure") != 0] `` m2 is neither sec_mode_complete nor sec_mode_failure
==>
[$|m2:UNSOLICITED_SEC_MODE_CMD_RRC_RESPONSE]
[!|debugprintf("[Unsolicited Response of SEC_MODE_CMD (RRC)][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[+unsolicited_msg_event|bs_id = session.bs_id,
ue_rnti = session.rnti,
msg = m1.msg,
resp = m2.msg,
ts = m2.ts
]
]
rule[downlink_unsolicited_event:
[+ue_mf:ue_mobiflow^DOWNLINK_UNSOLICITED_EVENT]
`[?|ue_mf.nas_state == 0]
[+unsol_msg_ev:unsolicited_msg_event|bs_id == ue_mf.bs_id, ue_rnti == ue_mf.rnti]
==>
[$|ue_mf:DOWNLINK_UNSOLICITED_EVENT]
[+event|id = 'event_id_cntr,
name = "Downlink Overshadowing",
ts = ue_mf.timestamp,
bs_id = ue_mf.bs_id,
ue = ue_mf.rnti
]
`[!|debugprintf("Downlink Overshadowing detected for UE %d at BS %d\n", ue_mf.rnti, ue_mf.bs_id)]
[!|debugprintf("Unsolicited response detected for %s: %s\n", unsol_msg_ev.msg, unsol_msg_ev.resp)]
[!|eventprintfjson('event_id_cntr, "Downlink Overshadowing", ue_mf.bs_id, ue_mf.timestamp, ue_mf.rnti)]
[-|unsol_msg_ev]
]
```````````````````````````````````````````````````````````````````````
`` Null Cipher & Integrity on RRC
```````````````````````````````````````````````````````````````````````
rule[null_cipher_integrity_rrc:
[+m2:ue_msg^NULL_CIPHER_INTEGRITY_RRC]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "SecurityModeCommand") == 0] `` m1 is sec_mode_cmd
[?|strcmp(m2.msg, "SecurityModeFailure") == 0] `` m2 is is sec_mode_failure
==>
[$|m2:NULL_CIPHER_INTEGRITY_RRC]
[!|debugprintf("[Null Cipher & Integrity (RRC)][GENERATE_EVENT] Event detected for UE %d at BS %d\n", session.rnti, session.bs_id)]
[!|eventprintfjson('event_id_cntr, "Null Cipher & Integrity (RRC)", session.bs_id, session.ts, session.rnti)]
]
```````````````````````````````````````````````````````````````````````
`` Null Cipher & Integrity on NAS
```````````````````````````````````````````````````````````````````````
rule[null_cipher_integrity_nas:
[+m2:ue_msg^NULL_CIPHER_INTEGRITY_NAS]
[+session:ue_session|id == m2.ue_session_id] `` there exists a live UE session
[+m1:ue_msg | ue_session_id == session.id, msg_index == m2.msg_index - 1] `` m2 is the next message of m1
[?|strcmp(m1.msg, "SECURITY_MODE_COMMAND") == 0] `` m1 is sec_mode_cmd
[?|strcmp(m2.msg, "SECURITY_MODE_REJECT") == 0] `` m2 is is sec_mode_failure
==>
[$|m2:NULL_CIPHER_INTEGRITY_NAS]