Core Rule Set: a Ghost post's or page's canonical URL passes with a command or a file in it (closes #374)

While bodies are read, 932120 refused the canonical URL
`https://example.com/blog/powershell/` and 930120 refused
`https://example.com/blog/.htaccess/`. The new exclusions 900383 and 900384
switch both rules off for `posts.N.canonical_url` under
`/ghost/api/admin/posts/` and `pages.N.canonical_url` under
`/ghost/api/admin/pages/`, as `url` does, and only when the query has no field
of that name. The recorded requests gain the saves the Ghost 6.76.0 admin
sends when those addresses are set in a post's and a page's settings.

Model: opus-5-5

SPEC.md

@@ -1773,6 +1773,10 @@ member. A staff user's address skips them too: `username` when signing in, and
 `email` when creating the first staff user, asking for a password reset or
 saving a profile.
 
+The `canonical_url` of a post or a page skips 930120 and 932120, as `url` does.
+A post's skips them under `/ghost/api/admin/posts/`, and a page's under
+`/ghost/api/admin/pages/`.
+
 The articles carry HTML on purpose. These fields on the Admin API hold them:
 
 - `lexical`, which the editor saves, and `mobiledoc` and `html`, which
@@ -1813,7 +1817,7 @@ fields, on the Admin API:
 (941170 and 941210). Path traversal and SQL injection are still refused in every
 field above. Script injection is too, outside the articles and code injection.
 `; wget http://example.com/x.sh` is still refused in the query fields, the plain
-text and the addresses.
+text, the addresses and the canonical URLs.
 
 Coraza names a staff user's `profile_image` field `json.users.0.profile_image`.
 That name holds `.profile`, a file on the list of system files, so the name

internal/coreruleset/ghost.conf

@@ -216,6 +216,23 @@ SecRule REQUEST_FILENAME "@beginsWith /ghost/api/admin/" \
     SecRule &ARGS_GET:/^json\.(?:(?:posts|pages)\.\d+\.(?:lexical|mobiledoc|html|codeinjection_(?:head|foot))|settings\.\d+\.value)$/ "@eq 0" \
         "ctl:ruleRemoveTargetById=941110;ARGS:/^json\.(?:(?:posts|pages)\.\d+\.(?:lexical|mobiledoc|html|codeinjection_(?:head|foot))|settings\.\d+\.value)$/"
 
+# The canonical URL of a post or a page skips the two rules that url skips:
+#   930120: https://example.com/blog/.htaccess/
+#   932120: https://example.com/blog/powershell/
+# Each of these fields skips them only on its own path:
+#   posts.<n>.canonical_url, under /ghost/api/admin/posts/
+#   pages.<n>.canonical_url, under /ghost/api/admin/pages/
+SecRule REQUEST_FILENAME "@beginsWith /ghost/api/admin/posts/" \
+    "id:900383,phase:1,pass,nolog,chain"
+    SecRule &ARGS_GET:/^json\.posts\.\d+\.canonical_url$/ "@eq 0" \
+        "ctl:ruleRemoveTargetById=930120;ARGS:/^json\.posts\.\d+\.canonical_url$/,\
+        ctl:ruleRemoveTargetById=932120;ARGS:/^json\.posts\.\d+\.canonical_url$/"
+SecRule REQUEST_FILENAME "@beginsWith /ghost/api/admin/pages/" \
+    "id:900384,phase:1,pass,nolog,chain"
+    SecRule &ARGS_GET:/^json\.pages\.\d+\.canonical_url$/ "@eq 0" \
+        "ctl:ruleRemoveTargetById=930120;ARGS:/^json\.pages\.\d+\.canonical_url$/,\
+        ctl:ruleRemoveTargetById=932120;ARGS:/^json\.pages\.\d+\.canonical_url$/"
+
 # Saving a staff user's profile sends the field profile_image, whose name holds
 # .profile, a file the list of system files names (930120).
 SecRule REQUEST_FILENAME "@rx ^/ghost/api/admin/users/[0-9a-f]{24}/$" \

internal/coreruleset/ghost_test.go

@@ -143,6 +143,16 @@ var ghostAddressFields = []ghostField{
 	{http.MethodPut, ghostUser, `{"users":[{"email":"VALUE"}]}`},
 }
 
+// ghostCanonicalURLFields hold the canonical URL of a post or a page, and skip
+// 930120 and 932120, as url does.
+//
+//nolint:gochecknoglobals // a constant cannot be a list
+var ghostCanonicalURLFields = []ghostField{
+	{http.MethodPut, ghostPost, `{"posts":[{"canonical_url":"VALUE"}]}`},
+	{http.MethodPost, ghostPosts, `{"posts":[{"canonical_url":"VALUE"}]}`},
+	{http.MethodPut, ghostPage, `{"pages":[{"canonical_url":"VALUE"}]}`},
+}
+
 // ghostPostFields hold a post or a page, skip the rules of 900355, and take a
 // <script> element by 900366.
 //
@@ -220,13 +230,16 @@ var ghostQueryFields = []string{
 	ghostAdminFilter, ghostContentFilter, ghostSearch, ghostEmbed,
 }
 
-// ghostURLs are addresses 930120 and 932120 refused in url.
+// ghostURLs are addresses 930120 and 932120 refused in url and in a canonical
+// URL.
 //
 //nolint:gochecknoglobals // a constant cannot be a list
 var ghostURLs = []string{
 	"https://github.com/example/site/blob/main/.htaccess",
 	"https://example.com/blog/powershell-tips?ref=ghost",
 	"https://example.com/docs/python3/",
+	"https://example.com/blog/powershell/",
+	"https://example.com/blog/.htaccess/",
 }
 
 // ghostAddresses are addresses 930120, 932120 and 932260 refused.
@@ -327,6 +340,10 @@ func TestGhostOrdinaryValuesPassInTheExcludedFields(t *testing.T) {
 
 	for _, address := range ghostURLs {
 		wantGhostQuery(t, ghostEmbed+url.QueryEscape(address), false)
+
+		for _, f := range ghostCanonicalURLFields {
+			wantGhostField(t, f, address, false)
+		}
 	}
 
 	for _, address := range ghostAddresses {
@@ -395,7 +412,7 @@ func TestGhostAttacksAreRefusedInTheExcludedFields(t *testing.T) {
 
 	for _, attack := range ghostAttacks {
 		for _, f := range slices.Concat(ghostTextFields, ghostAddressFields,
-			ghostArticleFields, ghostCodeFields) {
+			ghostCanonicalURLFields, ghostArticleFields, ghostCodeFields) {
 			wantGhostField(t, f, attack, true)
 		}
 
@@ -407,7 +424,7 @@ func TestGhostAttacksAreRefusedInTheExcludedFields(t *testing.T) {
 	// A script injection stays refused in every field that does not take a
 	// <script> element.
 	for _, f := range slices.Concat(ghostTextFields, ghostAddressFields,
-		ghostSnippetAndNewsletterFooterFields) {
+		ghostCanonicalURLFields, ghostSnippetAndNewsletterFooterFields) {
 		wantGhostField(t, f, scriptTag, true)
 	}
 
@@ -416,8 +433,10 @@ func TestGhostAttacksAreRefusedInTheExcludedFields(t *testing.T) {
 	}
 
 	// A command after a separator stays refused wherever its rules do not
-	// misfire: in the query fields, the plain text and the addresses.
-	for _, f := range slices.Concat(ghostTextFields, ghostAddressFields) {
+	// misfire: in the query fields, the plain text, the addresses and the
+	// canonical URLs.
+	for _, f := range slices.Concat(ghostTextFields, ghostAddressFields,
+		ghostCanonicalURLFields) {
 		wantGhostField(t, f, commandAfterASeparator, true)
 	}
 
@@ -462,6 +481,8 @@ func TestGhostExclusionsAreNarrow(t *testing.T) {
 		setupEmail         = `{"setup":[{"email":"python3.dev@example.com"}]}`
 		passwordResetEmail = `{"password_reset":[{"email":"python3.dev@example.com"}]}`
 		userEmail          = `{"users":[{"email":"python3.dev@example.com"}]}`
+		postURL            = `{"posts":[{"canonical_url":"https://example.com/powershell/"}]}`
+		pageURL            = `{"pages":[{"canonical_url":"https://example.com/powershell/"}]}`
 	)
 
 	for _, refused := range []struct{ target, body string }{
@@ -498,6 +519,12 @@ func TestGhostExclusionsAreNarrow(t *testing.T) {
 		{ghostPasswordReset + "?json.password_reset.0.email=x", passwordResetEmail},
 		{ghostPosts, userEmail},
 		{ghostUser + "?json.users.0.email=x", userEmail},
+		{"/api/posts/1/", postURL},
+		{ghostMembers, postURL},
+		{ghostPage, postURL},
+		{ghostPost + "?json.posts.0.canonical_url=x", postURL},
+		{ghostPost, pageURL},
+		{ghostPage + "?json.pages.0.canonical_url=x", pageURL},
 		{ghostSession, `{"username":"x","pass":"' OR '1'='1"}`},
 		{"/ghost/api/admin/users/me/", `{"password":"' OR '1'='1"}`},
 		{"/ghost/api/admin/posts/1/", `{"users":[{"profile_image":null}]}`},

internal/coreruleset/testdata/ghost-requests.txt

@@ -533,6 +533,8 @@
 {"method": "GET", "target": "/ghost/api/admin/pages/6af45d34d281b00001a599a0/?formats=mobiledoc%2Clexical&include=tags%2Cauthors%2Cauthors.roles%2Cemail%2Ctiers%2Cnewsletter%2Ccount.clicks%2Cpost_revisions%2Cpost_revisions.author", "headers": ["Host: example.com", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "app-pragma: no-cache", "Accept: */*", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": ""}
 {"method": "PUT", "target": "/ghost/api/admin/pages/6af45d34d281b00001a599a0/?formats=mobiledoc%2Clexical&include=tags%2Cauthors%2Cauthors.roles%2Cemail%2Ctiers%2Cnewsletter%2Ccount.clicks%2Cpost_revisions%2Cpost_revisions.author", "headers": ["Host: example.com", "Content-Length: 3980", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "content-type: application/json", "app-pragma: no-cache", "Accept: */*", "Origin: http://example.com", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": "{\"pages\":[{\"title\":\"About: python3, powershell & .htaccess\",\"slug\":\"about-python3-powershell-htaccess\",\"lexical\":\"{\\\"root\\\":{\\\"children\\\":[{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Who writes here, and why.\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"About this site\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"extended-heading\\\",\\\"version\\\":1,\\\"tag\\\":\\\"h2\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Notes on \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":1,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"python3\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\", \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":2,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"powershell\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\" and the shell. Start with \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":16,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"ls -la ~/.ssh\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\" and read \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"the .htaccess primer\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"link\\\",\\\"version\\\":1,\\\"rel\\\":null,\\\"target\\\":null,\\\"title\\\":null,\\\"url\\\":\\\"https://example.com/htaccess\\\"},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\".\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\\"type\\\":\\\"codeblock\\\",\\\"version\\\":1,\\\"code\\\":\\\"Get-ChildItem -Force | Where-Object { $_.Name -like '.htaccess' }\\\\nInvoke-WebRequest -Uri https://example.com/feed.xml -OutFile feed.xml\\\",\\\"language\\\":\\\"powershell\\\",\\\"caption\\\":\\\"\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Contact\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"extended-heading\\\",\\\"version\\\":1,\\\"tag\\\":\\\"h3\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Write to \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"alice@example.com\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"link\\\",\\\"version\\\":1,\\\"rel\\\":null,\\\"target\\\":null,\\\"title\\\":null,\\\"url\\\":\\\"mailto:alice@example.com\\\"},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\".\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\Line truncated
 {"method": "PUT", "target": "/ghost/api/admin/pages/6af45d34d281b00001a599a0/?formats=mobiledoc%2Clexical&include=tags%2Cauthors%2Cauthors.roles%2Cemail%2Ctiers%2Cnewsletter%2Ccount.clicks%2Cpost_revisions%2Cpost_revisions.author", "headers": ["Host: example.com", "Content-Length: 3984", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "content-type: application/json", "app-pragma: no-cache", "Accept: */*", "Origin: http://example.com", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": "{\"pages\":[{\"title\":\"About: python3, powershell & .htaccess\",\"slug\":\"about-python3-powershell-htaccess\",\"lexical\":\"{\\\"root\\\":{\\\"children\\\":[{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Who writes here, and why.\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"About this site\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"extended-heading\\\",\\\"version\\\":1,\\\"tag\\\":\\\"h2\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Notes on \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":1,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"python3\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\", \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":2,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"powershell\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\" and the shell. Start with \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":16,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"ls -la ~/.ssh\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\" and read \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"the .htaccess primer\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"link\\\",\\\"version\\\":1,\\\"rel\\\":null,\\\"target\\\":null,\\\"title\\\":null,\\\"url\\\":\\\"https://example.com/htaccess\\\"},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\".\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\\"type\\\":\\\"codeblock\\\",\\\"version\\\":1,\\\"code\\\":\\\"Get-ChildItem -Force | Where-Object { $_.Name -like '.htaccess' }\\\\nInvoke-WebRequest -Uri https://example.com/feed.xml -OutFile feed.xml\\\",\\\"language\\\":\\\"powershell\\\",\\\"caption\\\":\\\"\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Contact\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"extended-heading\\\",\\\"version\\\":1,\\\"tag\\\":\\\"h3\\\"},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"Write to \\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1},{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"alice@example.com\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"link\\\",\\\"version\\\":1,\\\"rel\\\":null,\\\"target\\\":null,\\\"title\\\":null,\\\"url\\\":\\\"mailto:alice@example.com\\\"},{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\".\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1},{\\Line truncated
+{"method": "PUT", "target": "/ghost/api/admin/posts/6af5659a6dde5d0001d3d72e/?formats=mobiledoc%2Clexical&include=tags%2Cauthors%2Cauthors.roles%2Cemail%2Ctiers%2Cnewsletter%2Ccount.clicks%2Cpost_revisions%2Cpost_revisions.author", "headers": ["Host: example.com", "Content-Length: 713", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "content-type: application/json", "app-pragma: no-cache", "Accept: */*", "Origin: http://example.com", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3AoIVlIxucaQas8uV_V0tI2mNyxYEoOjBC.ajmnN2F%2BNe0IFunZWICXaJjQpUSV75M6lrkP5I0svVs"], "body": "{\"posts\":[{\"title\":\"Getting started with PowerShell\",\"slug\":\"getting-started-with-powershell\",\"lexical\":\"{\\\"root\\\":{\\\"children\\\":[{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"First published on the old blog.\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"root\\\",\\\"version\\\":1}}\",\"feature_image\":null,\"feature_image_alt\":null,\"feature_image_caption\":null,\"status\":\"draft\",\"published_at\":null,\"canonical_url\":\"https://example.com/blog/powershell/\",\"id\":\"6af5659a6dde5d0001d3d72e\",\"updated_at\":\"2026-11-12T07:07:12.000Z\"}]}"}
+{"method": "PUT", "target": "/ghost/api/admin/pages/6af565b96dde5d0001d3d735/?formats=mobiledoc%2Clexical&include=tags%2Cauthors%2Cauthors.roles%2Cemail%2Ctiers%2Cnewsletter%2Ccount.clicks%2Cpost_revisions%2Cpost_revisions.author", "headers": ["Host: example.com", "Content-Length: 701", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "content-type: application/json", "app-pragma: no-cache", "Accept: */*", "Origin: http://example.com", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3AoIVlIxucaQas8uV_V0tI2mNyxYEoOjBC.ajmnN2F%2BNe0IFunZWICXaJjQpUSV75M6lrkP5I0svVs"], "body": "{\"pages\":[{\"title\":\"Rewrite rules in .htaccess\",\"slug\":\"rewrite-rules-in-htaccess\",\"lexical\":\"{\\\"root\\\":{\\\"children\\\":[{\\\"children\\\":[{\\\"detail\\\":0,\\\"format\\\":0,\\\"mode\\\":\\\"normal\\\",\\\"style\\\":\\\"\\\",\\\"text\\\":\\\"First published on the old blog.\\\",\\\"type\\\":\\\"extended-text\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"paragraph\\\",\\\"version\\\":1}],\\\"direction\\\":\\\"ltr\\\",\\\"format\\\":\\\"\\\",\\\"indent\\\":0,\\\"type\\\":\\\"root\\\",\\\"version\\\":1}}\",\"feature_image\":null,\"feature_image_alt\":null,\"feature_image_caption\":null,\"status\":\"draft\",\"published_at\":null,\"canonical_url\":\"https://example.com/blog/.htaccess/\",\"id\":\"6af565b96dde5d0001d3d735\",\"updated_at\":\"2026-11-12T07:07:42.000Z\"}]}"}
 {"method": "GET", "target": "/ghost/assets/pages-route-Bx4g0rd3.js", "headers": ["Host: example.com", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "Origin: http://example.com", "Accept: */*", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": ""}
 {"method": "GET", "target": "/ghost/api/admin/pages/?filter=status%3Ascheduled&order=published_at+desc&limit=30", "headers": ["Host: example.com", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "app-pragma: no-cache", "Accept: */*", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": ""}
 {"method": "GET", "target": "/ghost/api/admin/pages/?filter=status%3Adraft&order=updated_at+desc&limit=30", "headers": ["Host: example.com", "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.8078.4 Safari/537.36", "app-pragma: no-cache", "Accept: */*", "Referer: http://example.com/ghost/", "Accept-Encoding: gzip, deflate", "Cookie: ghost-admin-api-session=s%3ApyQuEYuuhAK8u18lU0bDl1kAjTTCtLBe.fHhgUS7MTBvPYpROnyCJjqXG%2BzBuicl%2Bw6WGQi%2Brq5Q"], "body": ""}

internal/rproxy/limits_test.go

@@ -93,10 +93,15 @@ func TestABodyAnnouncedOverItsLimitIsRefusedOnceWAFAllowsIt(t *testing.T) {
 				},
 			)
 
-			got := visit(t, newRequest(t, http.MethodPost, addr, "/",
-				bytes.NewReader(make([]byte, tc.size))))
-			if got.status != http.StatusRequestEntityTooLarge {
-				t.Errorf("answered %+v, want 413", got)
+			// The visitor sends no Connection: close, so Go's server reads the rest
+			// of the body before it closes the connection. Closed with the rest
+			// unread, the connection is reset while the visitor still sends.
+			conn := dial(t, addr)
+			send(t, conn, post+announcedLength(tc.size)+
+				strings.Repeat("x", tc.size))
+
+			if status := readStatus(t, conn); status != http.StatusRequestEntityTooLarge {
+				t.Errorf("status %d, want 413", status)
 			}
 
 			if asked := standIn.question(t); len(asked.body) != tc.asked {