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Beschreibung
Summary
Corazas current AuditLog format in json has empty values for important fields and is overall less detailed compared to libmodsecurity3. Since the stated goal is to be a "drop in replacement" for modsecurity, logging parity would be beneficial.
Basic example
Below are AuditLogs from coraza-spoa ccompared to libmodsecurity3 with the following http request intended to trigger the WAF. curl -v http://127.0.0.100/?x\=/etc/passwd
AuditLog generated from coraza-spoa
{
"transaction": {
"timestamp": "2023/08/05 13:58:06",
"unix_timestamp": 1691236686919190605,
"id": "622c3c2b-073f-43c8-9878-657be5d8a69f",
"client_ip": "127.0.0.1",
"client_port": 6203,
"host_ip": "127.0.0.100",
"host_port": 80,
"server_id": "",
"request": {
"method": "",
"protocol": "",
"uri": "",
"http_version": "",
"headers": {
"accept": [
"*/*"
],
"host": [
"127.0.0.100"
],
"user-agent": [
"curl/7.61.1"
]
},
"body": "",
"files": null
},
"response": {
"protocol": "",
"status": 0,
"headers": {},
"body": ""
},
"producer": {
"connector": "",
"version": "",
"server": "",
"rule_engine": "On",
"stopwatch": "1691236686919190605 1091256; combined=1046168, p1=360327, p2=646155, p3=0, p4=0, p5=39686",
"rulesets": [
"OWASP_CRS/4.0.0-rc1"
]
}
}
}
There are details in coraza-spoa default error log but this is only partially json and not compareable to the auditlog:
{
"level": "error",
"ts": 1691236686.9202244,
"msg": "[client \"127.0.0.1\"] Coraza: Access denied (phase 2). Inbound Anomaly Score Exceeded (Total Score: 13) [file \"/path/to/rules/REQUEST-949-BLOCKING-EVALUATION.conf\"] [line \"11001\"] [id \"949110\"] [rev \"\"] [msg \"Inbound Anomaly Score Exceeded (Total Score: 13)\"] [data \"\"] [severity \"emergency\"] [ver \"OWASP_CRS/4.0.0-rc1\"] [maturity \"0\"] [accuracy \"0\"] [tag \"anomaly-evaluation\"] [hostname \"127.0.0.100\"] [uri \"/?x=/etc/passwd\"] [unique_id \"622c3c2b-073f-43c8-9878-657be5d8a69f\"]\n"
}
AuditLog from libmodsecurity3
"transaction": {
"client_ip": "127.0.0.1",
"time_stamp": "Thu Aug 3 22:42:14 2023",
"server_id": "5dab6b80f157",
"client_port": 0,
"host_ip": "127.0.0.100",
"host_port": 80,
"unique_id": "d181c234abcd1be01421",
"request": {
"method": "GET",
"http_version": 1.1,
"uri": "/?x=/etc/passwd",
"body": "",
"headers": {
"host": "example.tld",
"user-agent": "curl/7.61.1",
"accept": "*/*",
"x-forwarded-for": "127.0.0.1"
}
},
"response": {
"body": "<!doctype html>\n<head><meta charset=\"utf-8\">\n<title>403 Forbidden</title>\n</head>\n<style> .... ",
"http_code": 403,
"headers": {
"Server": "nginx",
"Date": "Thu, 03 Aug 2023 20:42:14 GMT",
"Content-Type": "text/html",
"Connection": "keep-alive"
}
},
"producer": {
"modsecurity": "ModSecurity v3.0.10 (Linux)",
"connector": "ModSecurity-nginx v1.0.3",
"secrules_engine": "Enabled",
"components": [
"OWASP_CRS/3.3.5\""
]
},
"messages": [
{
"message": "OS File Access Attempt",
"details": {
"match": "Matched \"Operator `PmFromFile' with parameter `lfi-os-files.data' against variable `ARGS:x' (Value: `/etc/passwd' )",
"reference": "o1,10v8,11t:utf8toUnicode,t:urlDecodeUni,t:normalizePathWin,t:lowercase",
"ruleId": "930120",
"file": "/path/to/rules/REQUEST-930-APPLICATION-ATTACK-LFI.conf",
"lineNumber": "79",
"data": "Matched Data: etc/passwd found within ARGS:x: /etc/passwd",
"severity": "2",
"ver": "OWASP_CRS/3.3.5",
"rev": "",
"tags": [
"application-multi",
"language-multi",
"platform-multi",
"attack-lfi",
"paranoia-level/1",
"OWASP_CRS",
"capec/1000/255/153/126",
"PCI/6.5.4"
],
"maturity": "0",
"accuracy": "0"
}
},
{
"message": "Remote Command Execution: Unix Shell Code Found",
"details": {
"match": "Matched \"Operator `PmFromFile' with parameter `unix-shell.data' against variable `ARGS:x' (Value: `/etc/passwd' )",
"reference": "o1,10v8,11t:urlDecodeUni,t:cmdLine,t:normalizePath,t:lowercase",
"ruleId": "932160",
"file": "/path/to/rules/REQUEST-932-APPLICATION-ATTACK-RCE.conf",
"lineNumber": "481",
"data": "Matched Data: etc/passwd found within ARGS:x: /etc/passwd",
"severity": "2",
"ver": "OWASP_CRS/3.3.5",
"rev": "",
"tags": [
"application-multi",
"language-shell",
"platform-unix",
"attack-rce",
"paranoia-level/1",
"OWASP_CRS",
"capec/1000/152/248/88",
"PCI/6.5.2"
],
"maturity": "0",
"accuracy": "0"
}
},
{
"message": "Inbound Anomaly Score Exceeded (Total Score: 10)",
"details": {
"match": "Matched \"Operator `Ge' with parameter `5' against variable `TX:ANOMALY_SCORE' (Value: `10' )",
"reference": "",
"ruleId": "949110",
"file": "/path/to/rules/REQUEST-949-BLOCKING-EVALUATION.conf",
"lineNumber": "81",
"data": "",
"severity": "2",
"ver": "OWASP_CRS/3.3.5",
"rev": "",
"tags": [
"application-multi",
"language-multi",
"platform-multi",
"attack-generic"
],
"maturity": "0",
"accuracy": "0"
}
}
]
}
}
Motivation
Detailed Logs in JSON format make it easy to store and analyze the logs in tools like elasticsearch or similiar. This increases the visibility of attacks, aids with filtering of false positives and greatly improves overall usefullness.