Merge commit from fork

2026-07-04 19:31:56 +00:00 · 2026-05-07 20:18:11 +03:00
parent ce12717ad7
commit 2a7100053a
4 changed files with 335 additions and 12 deletions
@@ -532,6 +532,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tts_format", "tests\un
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mod_test", "src\mod\applications\mod_test\mod_test.2017.vcxproj", "{E9FF8127-D5F0-2398-59EB-702CE55F7800}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_switch_xml", "tests\unit\test_switch_xml.2017.vcxproj", "{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		All|Win32 = All|Win32
@@ -2390,6 +2392,18 @@ Global
 		{E9FF8127-D5F0-2398-59EB-702CE55F7800}.Release|Win32.Build.0 = Release|Win32
 		{E9FF8127-D5F0-2398-59EB-702CE55F7800}.Release|x64.ActiveCfg = Release|x64
 		{E9FF8127-D5F0-2398-59EB-702CE55F7800}.Release|x64.Build.0 = Release|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.All|Win32.ActiveCfg = Debug|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.All|Win32.Build.0 = Debug|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.All|x64.ActiveCfg = Debug|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.All|x64.Build.0 = Debug|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Debug|Win32.ActiveCfg = Debug|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Debug|Win32.Build.0 = Debug|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Debug|x64.ActiveCfg = Debug|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Debug|x64.Build.0 = Debug|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Release|Win32.ActiveCfg = Release|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Release|Win32.Build.0 = Release|Win32
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Release|x64.ActiveCfg = Release|x64
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -2578,6 +2592,7 @@ Global
 		{589A07E7-5DE5-49FD-A62C-27795B806AFB} = {9388C266-C3FC-468A-92EF-0CBC35941412}
 		{3745B86B-6BE8-3E67-FCB9-BE62A6131D67} = {9388C266-C3FC-468A-92EF-0CBC35941412}
 		{E9FF8127-D5F0-2398-59EB-702CE55F7800} = {E72B5BCB-6462-4D23-B419-3AF1A4AC3D78}
+		{FED39CFF-E6CD-1C09-844D-F1174B8A5C18} = {9388C266-C3FC-468A-92EF-0CBC35941412}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {09840DE7-9208-45AA-9667-1A71EE93BD1E}
@@ -103,6 +103,10 @@ void globfree(glob_t *);
 #define SWITCH_XML_WS   "\t\r\n "	/* whitespace */
 #define SWITCH_XML_ERRL 128		/* maximum error string length */

+/* Limits for entity expansion to prevent excessive resource consumption */
+#define SWITCH_XML_MAX_ENTITY_EXPANSION_DEPTH 20              /* Maximum recursion depth for entity expansion */
+#define SWITCH_XML_MAX_ENTITY_EXPANSION_COUNT 10000           /* Maximum number of entity expansions */
+
 static void preprocess_exec_set(char *keyval)
 {
 	char *key = keyval;
@@ -760,23 +764,54 @@ static switch_xml_t switch_xml_close_tag(switch_xml_root_t root, char *name, cha
 	return NULL;
 }

+/* Depth-limited version with resource limits for entity validation */
+static int switch_xml_ent_ok_with_depth(char *name, char *s, char **ent, int depth, unsigned long *check_count)
+{
+	int i;
+
+	/* Prevent excessive recursion during entity validation */
+	if (depth > SWITCH_XML_MAX_ENTITY_EXPANSION_DEPTH) {
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING,
+			"Entity validation depth limit exceeded (%d > %d) for entity: %s\n",
+			depth, SWITCH_XML_MAX_ENTITY_EXPANSION_DEPTH, name);
+
+		return 0;  /* Treat as invalid - too deep */
+	}
+
+	for (;; s++) {
+		while (*s && *s != '&') {
+			s++;				/* find next entity reference */
+		}
+
+		if (!*s)
+			return 1;
+
+		/* Increment check counter for each entity reference found */
+		if (++(*check_count) > SWITCH_XML_MAX_ENTITY_EXPANSION_COUNT) {
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING,
+				"Entity validation count limit exceeded (%lu > %d) for entity: %s\n",
+				*check_count, SWITCH_XML_MAX_ENTITY_EXPANSION_COUNT, name);
+
+			return 0;  /* Treat as invalid - too many entity references */
+		}
+
+		if (!strncmp(s + 1, name, strlen(name)))
+			return 0;			/* circular ref. */
+
+		for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2);
+
+		if (ent[i] && !switch_xml_ent_ok_with_depth(name, ent[i + 1], ent, depth + 1, check_count))
+			return 0;
+	}
+}
+
 /* checks for circular entity references, returns non-zero if no circular
   references are found, zero otherwise */
 static int switch_xml_ent_ok(char *name, char *s, char **ent)
 {
-	int i;
+	unsigned long check_count = 0;

-	for (;; s++) {
-		while (*s && *s != '&')
-			s++;				/* find next entity reference */
-		if (!*s)
-			return 1;
-		if (!strncmp(s + 1, name, strlen(name)))
-			return 0;			/* circular ref. */
-		for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2);
-		if (ent[i] && !switch_xml_ent_ok(name, ent[i + 1], ent))
-			return 0;
-	}
+	return switch_xml_ent_ok_with_depth(name, s, ent, 0, &check_count);
 }

 /* called when the parser finds a processing instruction */
@@ -185,6 +185,71 @@ FST_MINCORE_BEGIN("./conf")
 		}
 		FST_TEST_END()

+		FST_TEST_BEGIN(test_exponential_entity_expansion)
+		{
+			/* Test handling of exponentially nested entity definitions
+			 * Each entity references the previous one 10 times, creating
+			 * 10^10 total references which would consume excessive memory
+			 * if fully expanded. Parser should enforce expansion limits.
+			 */
+			const char *nested_entities =
+				"<?xml version=\"1.0\"?>\n"
+				"<!DOCTYPE lolz [\n"
+				"<!ENTITY lol \"lol\">\n"
+				"<!ELEMENT lolz (#PCDATA)>\n"
+				"<!ENTITY lol1 \"&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;\">\n"
+				"<!ENTITY lol2 \"&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;\">\n"
+				"<!ENTITY lol3 \"&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;\">\n"
+				"<!ENTITY lol4 \"&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;\">\n"
+				"<!ENTITY lol5 \"&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;\">\n"
+				"<!ENTITY lol6 \"&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;\">\n"
+				"<!ENTITY lol7 \"&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;\">\n"
+				"<!ENTITY lol8 \"&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;\">\n"
+				"<!ENTITY lol9 \"&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;\">\n"
+				"<!ENTITY lol10 \"&lol9;&lol9;&lol9;&lol9;&lol9;&lol9;&lol9;&lol9;&lol9;&lol9;\">\n"
+				"]>\n"
+				"<lolz>&lol10;</lolz>";
+
+			switch_xml_t xml = switch_xml_parse_str_dynamic((char *)nested_entities, SWITCH_TRUE);
+
+			if (xml) {
+				const char *error = switch_xml_error(xml);
+				if (error && *error) {
+					/* Parser enforced expansion limits */
+					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO,
+						"Parser correctly enforced entity expansion limits: %s\n", error);
+					switch_xml_free(xml);
+				} else {
+					/* Parser did not enforce limits */
+					switch_xml_free(xml);
+					fst_fail("Parser did not enforce entity expansion limits");
+				}
+			} else {
+				/* Parser returned NULL */
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO,
+					"Parser rejected excessive entity expansion\n");
+			}
+		}
+		FST_TEST_END()
+
+		FST_TEST_BEGIN(test_entity_expansion_limit)
+		{
+			/* Test that reasonable entity usage still works */
+			const char *safe_entities =
+				"<?xml version=\"1.0\"?>\n"
+				"<!DOCTYPE test [\n"
+				"<!ENTITY company \"FreeSWITCH\">\n"
+				"<!ENTITY product \"&company; Media Server\">\n"
+				"]>\n"
+				"<test>&product;</test>";
+
+			switch_xml_t xml = switch_xml_parse_str_dynamic((char *)safe_entities, SWITCH_TRUE);
+
+			fst_requires(xml);
+			fst_check_string_equals(xml->txt, "FreeSWITCH Media Server");
+			switch_xml_free(xml);
+		}
+		FST_TEST_END()
 	}
 	FST_SUITE_END()
 }
@@ -0,0 +1,208 @@
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+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
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+  <PropertyGroup Label="Globals">
+    <ProjectName>test_switch_xml</ProjectName>
+    <RootNamespace>test_switch_xml</RootNamespace>
+    <Keyword>Win32Proj</Keyword>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
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