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Fix phase 2 and 3 audit logging in case of internal redirect #255

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Fix phase 2 and 3 audit logging in case of internal redirect #255

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d90eed5
Tests: Add test cases for all phases in custom error page test
mlevogiannis Nov 23, 2021
02249da
Fix phase 2 and 3 audit logging in case of internal redirect
mlevogiannis Nov 24, 2021
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4 changes: 2 additions & 2 deletions src/ngx_http_modsecurity_body_filter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,7 @@ ngx_http_modsecurity_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
int ret;

msc_append_response_body(ctx->modsec_transaction, data, chain->buf->last - data);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 0);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (ret > 0) {
return ngx_http_filter_finalize_request(r,
&ngx_http_modsecurity_module, ret);
Expand All @@ -165,7 +165,7 @@ ngx_http_modsecurity_body_filter(ngx_http_request_t *r, ngx_chain_t *in)

/* XXX: I don't get how body from modsec being transferred to nginx's buffer. If so - after adjusting of nginx's
XXX: body we can proceed to adjust body size (content-length). see xslt_body_filter() for example */
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 0);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (ret > 0) {
return ret;
}
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2 changes: 1 addition & 1 deletion src/ngx_http_modsecurity_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ typedef struct {
extern ngx_module_t ngx_http_modsecurity_module;

/* ngx_http_modsecurity_module.c */
int ngx_http_modsecurity_process_intervention (Transaction *transaction, ngx_http_request_t *r, ngx_int_t early_log);
int ngx_http_modsecurity_process_intervention (Transaction *transaction, ngx_http_request_t *r);
ngx_http_modsecurity_ctx_t *ngx_http_modsecurity_create_ctx(ngx_http_request_t *r);
char *ngx_str_to_char(ngx_str_t a, ngx_pool_t *p);
#if (NGX_PCRE2)
Expand Down
2 changes: 1 addition & 1 deletion src/ngx_http_modsecurity_header_filter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -528,7 +528,7 @@ ngx_http_modsecurity_header_filter(ngx_http_request_t *r)
old_pool = ngx_http_modsecurity_pcre_malloc_init(r->pool);
msc_process_response_headers(ctx->modsec_transaction, status, http_response_ver);
ngx_http_modsecurity_pcre_malloc_done(old_pool);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 0);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (r->error_page) {
return ngx_http_next_header_filter(r);
}
Expand Down
1 change: 1 addition & 0 deletions src/ngx_http_modsecurity_log.c
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,7 @@ ngx_http_modsecurity_log_handler(ngx_http_request_t *r)
old_pool = ngx_http_modsecurity_pcre_malloc_init(r->pool);
msc_process_logging(ctx->modsec_transaction);
ngx_http_modsecurity_pcre_malloc_done(old_pool);
ctx->logged = 1;

return NGX_OK;
}
9 changes: 3 additions & 6 deletions src/ngx_http_modsecurity_module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ ngx_inline char *ngx_str_to_char(ngx_str_t a, ngx_pool_t *p)


int
ngx_http_modsecurity_process_intervention (Transaction *transaction, ngx_http_request_t *r, ngx_int_t early_log)
ngx_http_modsecurity_process_intervention (Transaction *transaction, ngx_http_request_t *r)
{
char *log = NULL;
ModSecurityIntervention intervention;
Expand Down Expand Up @@ -222,11 +222,8 @@ ngx_http_modsecurity_process_intervention (Transaction *transaction, ngx_http_re
*/
msc_update_status_code(ctx->modsec_transaction, intervention.status);

if (early_log) {
dd("intervention -- calling log handler manually with code: %d", intervention.status);
ngx_http_modsecurity_log_handler(r);
ctx->logged = 1;
}
dd("intervention -- calling log handler manually with code: %d", intervention.status);
ngx_http_modsecurity_log_handler(r);

if (r->header_sent)
{
Expand Down
4 changes: 2 additions & 2 deletions src/ngx_http_modsecurity_pre_access.c
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Original file line number Diff line number Diff line change
Expand Up @@ -195,7 +195,7 @@ ngx_http_modsecurity_pre_access_handler(ngx_http_request_t *r)
* it may ask for a intervention in consequence of that.
*
*/
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 0);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (ret > 0) {
return ret;
}
Expand All @@ -214,7 +214,7 @@ ngx_http_modsecurity_pre_access_handler(ngx_http_request_t *r)
msc_process_request_body(ctx->modsec_transaction);
ngx_http_modsecurity_pcre_malloc_done(old_pool);

ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 0);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (r->error_page) {
return NGX_DECLINED;
}
Expand Down
6 changes: 3 additions & 3 deletions src/ngx_http_modsecurity_rewrite.c
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Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,7 @@ ngx_http_modsecurity_rewrite_handler(ngx_http_request_t *r)
*
*/
dd("Processing intervention with the connection information filled in");
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 1);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (ret > 0) {
ctx->intervention_triggered = 1;
return ret;
Expand Down Expand Up @@ -166,7 +166,7 @@ ngx_http_modsecurity_rewrite_handler(ngx_http_request_t *r)
ngx_http_modsecurity_pcre_malloc_done(old_pool);

dd("Processing intervention with the transaction information filled in (uri, method and version)");
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 1);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (ret > 0) {
ctx->intervention_triggered = 1;
return ret;
Expand Down Expand Up @@ -215,7 +215,7 @@ ngx_http_modsecurity_rewrite_handler(ngx_http_request_t *r)
msc_process_request_headers(ctx->modsec_transaction);
ngx_http_modsecurity_pcre_malloc_done(old_pool);
dd("Processing intervention with the request headers information filled in");
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r, 1);
ret = ngx_http_modsecurity_process_intervention(ctx->modsec_transaction, r);
if (r->error_page) {
return NGX_DECLINED;
}
Expand Down
82 changes: 51 additions & 31 deletions tests/modsecurity-config-custom-error-page.t
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Original file line number Diff line number Diff line change
Expand Up @@ -55,15 +55,19 @@ http {
error_page 403 /403.html;

location /403.html {
root %%TESTDIR%%/http;
alias %%TESTDIR%%/403.html;
internal;
}

location / {
modsecurity on;
modsecurity_rules '
SecRuleEngine On
SecRule ARGS "@streq root" "id:10,phase:1,auditlog,status:403,deny"
SecResponseBodyAccess On
SecRule ARGS:phase1 "@streq BAD" "id:10,phase:1,auditlog,status:403,deny"
SecRule ARGS:phase2 "@streq BAD" "id:11,phase:2,auditlog,status:403,deny"
SecRule ARGS:phase3 "@streq BAD" "id:12,phase:3,auditlog,status:403,deny"
SecRule ARGS:phase4 "@streq BAD" "id:13,phase:4,auditlog,status:403,drop"
SecDebugLog %%TESTDIR%%/auditlog-debug-local.txt
SecDebugLogLevel 9
SecAuditEngine RelevantOnly
Expand All @@ -82,7 +86,11 @@ http {
modsecurity on;
modsecurity_rules '
SecRuleEngine On
SecRule ARGS "@streq root" "id:10,phase:1,auditlog,status:403,deny"
SecResponseBodyAccess On
SecRule ARGS:phase1 "@streq BAD" "id:10,phase:1,auditlog,status:403,deny"
SecRule ARGS:phase2 "@streq BAD" "id:11,phase:2,auditlog,status:403,deny"
SecRule ARGS:phase3 "@streq BAD" "id:12,phase:3,auditlog,status:403,deny"
SecRule ARGS:phase4 "@streq BAD" "id:13,phase:4,auditlog,status:403,drop"
SecDebugLog %%TESTDIR%%/auditlog-debug-global.txt
SecDebugLogLevel 9
SecAuditEngine RelevantOnly
Expand All @@ -96,7 +104,7 @@ http {

location /403.html {
modsecurity off;
root %%TESTDIR%%/http;
alias %%TESTDIR%%/403.html;
internal;
}

Expand All @@ -107,31 +115,28 @@ http {
EOF

my $index_txt = "This is the index page.";
my $custom_txt = "This is a custom error page.";
my $error_txt = "This is a custom error page.";

$t->write_file("/index.html", $index_txt);
mkdir($t->testdir() . '/http');
$t->write_file("/http/403.html", $custom_txt);
$t->write_file("/403.html", $error_txt);

$t->todo_alerts();
$t->run();
$t->plan(10);
$t->plan(32);

###############################################################################

my $d = $t->testdir();

my $t1;
my $t2;
my $t3;
my $t4;

# Performing requests to a server with ModSecurity enabled at location context
$t1 = http_get_host('s1', '/index.html?what=root');
$t2 = http_get_host('s1', '/index.html?what=other');

# Performing requests to a server with ModSecurity enabled at server context
$t3 = http_get_host('s2', '/index.html?what=root');
$t4 = http_get_host('s2', '/index.html?what=other');
like(http_get_host('s1', '/?phase1=BAD'), qr/$error_txt/, 'location context, phase 1, error page');
like(http_get_host('s1', '/?phase1=GOOD'), qr/$index_txt/, 'location context, phase 1, index page');
like(http_get_host('s1', '/?phase2=BAD'), qr/$error_txt/, 'location context, phase 2, error page');
like(http_get_host('s1', '/?phase2=GOOD'), qr/$index_txt/, 'location context, phase 2, index page');
like(http_get_host('s1', '/?phase3=BAD'), qr/$error_txt/, 'location context, phase 3, error page');
like(http_get_host('s1', '/?phase3=GOOD'), qr/$index_txt/, 'location context, phase 3, index page');
is(http_get_host('s1', '/?phase4=BAD'), '', 'location context, phase 4, drop');
like(http_get_host('s1', '/?phase4=GOOD'), qr/$index_txt/, 'location context, phase 4, index page');

my $local = do {
local $/ = undef;
Expand All @@ -140,25 +145,40 @@ my $local = do {
<$fh>;
};

like($local, qr/phase1=BAD/, 'location context, phase 1, BAD in auditlog');
unlike($local, qr/phase1=GOOD/, 'location context, phase 1, GOOD not in auditlog');
like($local, qr/phase2=BAD/, 'location context, phase 2, BAD in auditlog');
unlike($local, qr/phase2=GOOD/, 'location context, phase 2, GOOD not in auditlog');
like($local, qr/phase3=BAD/, 'location context, phase 3, BAD in auditlog');
unlike($local, qr/phase3=GOOD/, 'location context, phase 3, GOOD not in auditlog');
like($local, qr/phase4=BAD/, 'location context, phase 4, BAD in auditlog');
unlike($local, qr/phase4=GOOD/, 'location context, phase 4, GOOD not in auditlog');

# Performing requests to a server with ModSecurity enabled at server context
like(http_get_host('s2', '/?phase1=BAD'), qr/$error_txt/, 'server context, phase 1, error page');
like(http_get_host('s2', '/?phase1=GOOD'), qr/$index_txt/, 'server context, phase 1, index page');
like(http_get_host('s2', '/?phase2=BAD'), qr/$error_txt/, 'server context, phase 2, error page');
like(http_get_host('s2', '/?phase2=GOOD'), qr/$index_txt/, 'server context, phase 2, index page');
like(http_get_host('s2', '/?phase3=BAD'), qr/$error_txt/, 'server context, phase 3, error page');
like(http_get_host('s2', '/?phase3=GOOD'), qr/$index_txt/, 'server context, phase 3, index page');
is(http_get_host('s2', '/?phase4=BAD'), '', 'server context, phase 4, drop');
like(http_get_host('s2', '/?phase4=GOOD'), qr/$index_txt/, 'server context, phase 4, index page');

my $global = do {
local $/ = undef;
open my $fh, "<", "$d/auditlog-global.txt"
or die "could not open: $!";
<$fh>;
};

like($t1, qr/$custom_txt/, 'ModSecurity at location / root');
like($t2, qr/$index_txt/, 'ModSecurity at location / other');
like($local, qr/what=root/, 'ModSecurity at location / root present in auditlog');
unlike($local, qr/what=other/, 'ModSecurity at location / other not present in auditlog');

like($t3, qr/$custom_txt/, 'ModSecurity at server / root');
like($t4, qr/$index_txt/, 'ModSecurity at server / other');
like($global, qr/what=root/, 'ModSecurity at server / root present in auditlog');
unlike($global, qr/what=other/, 'ModSecurity at server / other not present in auditlog');

like($local, qr/Access denied with code 403/, 'ModSecurity at location / 403 in auditlog');
like($global, qr/Access denied with code 403/, 'ModSecurity at server / 403 in auditlog');
like($global, qr/phase1=BAD/, 'server context, phase 1, BAD in auditlog');
unlike($global, qr/phase1=GOOD/, 'server context, phase 1, GOOD not in auditlog');
like($global, qr/phase2=BAD/, 'server context, phase 2, BAD in auditlog');
unlike($global, qr/phase2=GOOD/, 'server context, phase 2, GOOD not in auditlog');
like($global, qr/phase3=BAD/, 'server context, phase 3, BAD in auditlog');
unlike($global, qr/phase3=GOOD/, 'server context, phase 3, GOOD not in auditlog');
like($global, qr/phase4=BAD/, 'server context, phase 4, BAD in auditlog');
unlike($global, qr/phase4=GOOD/, 'server context, phase 4, GOOD not in auditlog');

###############################################################################

Expand Down