[mod-security-users] Empty logfile/dirlog when changing auditlog from serial to concurrent with nginx

[David G. <sk...@gm...>]

I had a problem using the ModSecurity with nginx. The serial log had the
following error message: Audit log: Failed to lock global mutex: Permission
denied. Breno told me it was because of the serial mode and the solution
would be to switch to concurrent mode or to run nginx with root. I made
this, then the audit file index and audit log directory, both were empty.

Anyone ever experienced this?

# nginx -V
nginx version: nginx/1.4.1
built by gcc 4.7.2 (Debian 4.7.2-5)
TLS SNI support enabled
configure arguments:
--add-module=/usr/src/modsecurity-apache_2.7.4/nginx/modsecurity/
--add-module=/usr/local/nginx-1.4.1/nginx-upstream-fair/
--add-module=/usr/local/nginx-1.4.1/nginx-auth-ldap --prefix=/etc/nginx
--conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log
--http-client-body-temp-path=/var/lib/nginx/body
--http-fastcgi-temp-path=/var/lib/nginx/fastcgi
--http-log-path=/var/log/nginx/access.log
--http-proxy-temp-path=/var/lib/nginx/proxy
--http-scgi-temp-path=/var/lib/nginx/scgi
--http-uwsgi-temp-path=/var/lib/nginx/uwsgi
--lock-path=/var/lock/nginx.lock --pid-path=/var/run/nginx.pid
--with-pcre-jit --with-debug --with-http_addition_module
--with-http_dav_module --with-http_geoip_module
--with-http_gzip_static_module --with-http_image_filter_module
--with-http_realip_module --with-http_stub_status_module
--with-http_ssl_module --with-http_sub_module --with-http_xslt_module
--with-ipv6 --with-sha1=/usr/include/openssl
--with-md5=/usr/include/openssl --with-mail --with-mail_ssl_module

# grep -Ev "^#" /etc/nginx/modsecurity.conf  | uniq

SecRuleEngine On
SecDataDir /tmp/
SecTmpDir /tmp/

SecDefaultAction "log,deny,phase:1"

SecRequestBodyAccess On
SecResponseBodyMimeType (null) text/html text/plain text/xml

SecRequestBodyLimit 13107200
SecRequestBodyNoFilesLimit 131072

SecRequestBodyInMemoryLimit 131072

SecRequestBodyLimitAction ProcessPartial

SecRule REQBODY_ERROR "!@eq 0" "id:'200001', phase:2,t:none,log,deny, \
  status:400,msg:'Failed to parse request
body.',logdata:'%{reqbody_error_msg}',severity:2"

SecRule FILES_TMPNAMES "@inspectFile /etc/nginx/modsec-clamscan.pl" \
      "id:'200002', t:none,log,block"

SecUploadKeepFiles On

SecUploadFileMode 0640

SecAuditLogType Concurrent
SecAuditEngine RelevantOnly
SecAuditLog /var/log/nginx/modsec_audit_concurrent.log
SecAuditLogRelevantStatus "^(?:5|4(?!04))"

SecAuditLogParts ABCDEFGHZ

SecAuditLogStorageDir /var/log/nginx/audit/

 #  "phase:2,log,deny,status:500"

SecComponentSignature "OWASP_CRS/2.2.8"

SecAction \
  "id:'900001', \
  phase:1, \
  t:none, \
  setvar:tx.critical_anomaly_score=5, \
  setvar:tx.error_anomaly_score=4, \
  setvar:tx.warning_anomaly_score=3, \
  setvar:tx.notice_anomaly_score=2, \
  nolog, \
  pass"

SecAction \
  "id:'900002', \
  phase:1, \
  t:none, \
  setvar:tx.anomaly_score=0, \
  setvar:tx.sql_injection_score=0, \
  setvar:tx.xss_score=0, \
  setvar:tx.inbound_anomaly_score=0, \
  setvar:tx.outbound_anomaly_score=0, \
  nolog, \
  pass"

SecAction \
  "id:'900003', \
  phase:1, \
  t:none, \
  setvar:tx.inbound_anomaly_score_level=5, \
  setvar:tx.outbound_anomaly_score_level=4, \
  nolog, \
  pass"

  "id:'900004', \
  phase:1, \
  t:none, \
  setvar:tx.anomaly_score_blocking=on, \
  nolog, \
  pass"

  "id:'900005', \
  phase:1, \
  t:none, \
  ctl:ruleEngine=DetectionOnly, \
  setvar:tx.regression_testing=1, \
  nolog, \
  pass"

SecAction \
  "id:'900006', \
  phase:1, \
  t:none, \
  setvar:tx.max_num_args=255, \
  nolog, \
  pass"

  "id:'900007', \
  phase:1, \
  t:none, \
  setvar:tx.arg_name_length=100, \
  nolog, \
  pass"

  "id:'900008', \
  phase:1, \
  t:none, \
  setvar:tx.arg_length=400, \
  nolog, \
  pass"

  "id:'900009', \
  phase:1, \
  t:none, \
  setvar:tx.total_arg_length=64000, \
  nolog, \
  pass"

  "id:'900010', \
  phase:1, \
  t:none, \
  setvar:tx.max_file_size=1048576, \
  nolog, \
  pass"

  "id:'900011', \
  phase:1, \
  t:none, \
  setvar:tx.combined_file_sizes=1048576, \
  nolog, \
  pass"

SecAction \
  "id:'900012', \
  phase:1, \
  t:none, \
  setvar:'tx.allowed_methods=GET HEAD POST OPTIONS', \

setvar:'tx.allowed_request_content_type=application/x-www-form-urlencoded|multipart/form-data|text/xml|application/xml|application/x-amf|application/json',
\
  setvar:'tx.allowed_http_versions=HTTP/0.9 HTTP/1.0 HTTP/1.1', \
  setvar:'tx.restricted_extensions=.asa/ .asax/ .ascx/ .axd/ .backup/ .bak/
.bat/ .cdx/ .cer/ .cfg/ .cmd/ .com/ .config/ .conf/ .cs/ .csproj/ .csr/
.dat/ .db/ .dbf/ .dll/ .dos/ .htr/ .htw/ .ida/ .idc/ .idq/ .inc/ .ini/
.key/ .licx/ .lnk/ .log/ .mdb/ .old/ .pass/ .pdb/ .pol/ .printer/ .pwd/
.resources/ .resx/ .sql/ .sys/ .vb/ .vbs/ .vbproj/ .vsdisco/ .webinfo/
.xsd/ .xsx/', \
  setvar:'tx.restricted_headers=/Proxy-Connection/ /Lock-Token/
/Content-Range/ /Translate/ /via/ /if/', \
  nolog, \
  pass"

  "id:'900013', \
  phase:1, \
  t:none, \
  setvar:tx.csp_report_only=1, \
  setvar:tx.csp_report_uri=/csp_violation_report, \
  setenv:'csp_policy=allow \'self\'; img-src *.yoursite.com; media-src *.
yoursite.com; style-src *.yoursite.com; frame-ancestors *.yoursite.com;
script-src *.yoursite.com; report-uri %{tx.csp_report_uri}', \
  nolog, \
  pass"

  "id:'900014', \
  phase:1, \
  t:none, \
  setvar:'tx.brute_force_protected_urls=#/login.jsp# #/partner_login.php#',
\
  setvar:'tx.brute_force_burst_time_slice=60', \
  setvar:'tx.brute_force_counter_threshold=10', \
  setvar:'tx.brute_force_block_timeout=300', \
  nolog, \
  pass"

  "id:'900015', \
  phase:1, \
  t:none, \
  setvar:'tx.dos_burst_time_slice=60', \
  setvar:'tx.dos_counter_threshold=100', \
  setvar:'tx.dos_block_timeout=600', \
  nolog, \
  pass"

  "id:'900016', \
  phase:1, \
  t:none, \
  setvar:tx.crs_validate_utf8_encoding=1, \
  nolog, \
  pass"

SecRule REQUEST_HEADERS:Content-Type "text/xml" \
  "id:'900017', \
  phase:1, \
  t:none,t:lowercase, \
  nolog, \
  pass, \
  chain"
    SecRule REQBODY_PROCESSOR "!@streq XML" \
      "ctl:requestBodyProcessor=XML"

SecRule REQUEST_HEADERS:User-Agent "^(.*)$" \
  "id:'900018', \
  phase:1, \
  t:none,t:sha1,t:hexEncode, \
  setvar:tx.ua_hash=%{matched_var}, \
  nolog, \
  pass"

SecRule REQUEST_HEADERS:x-forwarded-for
"^\b(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\b" \
  "id:'900019', \
  phase:1, \
  t:none, \
  capture, \
  setvar:tx.real_ip=%{tx.1}, \
  nolog, \
  pass"

SecRule &TX:REAL_IP "!@eq 0" \
  "id:'900020', \
  phase:1, \
  t:none, \
  initcol:global=global, \
  initcol:ip=%{tx.real_ip}_%{tx.ua_hash}, \
  nolog, \
  pass"

SecRule &TX:REAL_IP "@eq 0" \
  "id:'900021', \
  phase:1, \
  t:none, \
  initcol:global=global, \
  initcol:ip=%{remote_addr}_%{tx.ua_hash}, \
  setvar:tx.real_ip=%{remote_addr}, \
  nolog, \
  pass"

Include modsecurity/base_rules/exceptions.conf
Include modsecurity/base_rules/modsecurity_crs_20_protocol_violations.conf
Include modsecurity/base_rules/modsecurity_crs_21_protocol_anomalies.conf
Include modsecurity/base_rules/modsecurity_crs_23_request_limits.conf
Include modsecurity/base_rules/modsecurity_crs_30_http_policy.conf
Include modsecurity/base_rules/modsecurity_crs_35_bad_robots.conf
Include modsecurity/base_rules/modsecurity_crs_40_generic_attacks.conf
Include modsecurity/base_rules/modsecurity_crs_41_sql_injection_attacks.conf
Include modsecurity/base_rules/modsecurity_crs_41_xss_attacks.conf
Include modsecurity/base_rules/modsecurity_crs_42_tight_security.conf
Include modsecurity/base_rules/modsecurity_crs_45_trojans.conf
Include modsecurity/base_rules/modsecurity_crs_47_common_exceptions.conf
Include modsecurity/base_rules/modsecurity_crs_49_inbound_blocking.conf
Include modsecurity/base_rules/modsecurity_crs_50_outbound.conf
Include modsecurity/base_rules/modsecurity_crs_59_outbound_blocking.conf
Include modsecurity/base_rules/modsecurity_crs_60_correlation.conf


-- 
David Gomes Guimarães