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Harden connection string DNS zone matching

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Detect PPE accounts from Mongo and Cassandra connection strings, build their document endpoint from the matched zone, match the PPE suffix on a label boundary, and escape every regex metacharacter in config-supplied zones. Drop the sqlx.cosmosdb.azure.com zone, which is not a real SQL zone.
This commit is contained in:
Asier Isayas
2026-08-26 14:28:32 -04:00
parent 7649070811
commit 527fc2c48c
3 changed files with 92 additions and 104 deletions
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src/ConfigContext.ts
-1
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@@ -92,7 +92,6 @@ let configContext: Readonly<ConfigContext> = {
"documents.azure.com", "documents.azure.com",
"sql.cosmosdb.azure.com", "sql.cosmosdb.azure.com",
"sql.cosmos.azure.com", "sql.cosmos.azure.com",
"sqlx.cosmosdb.azure.com",
"sqlx.cosmos.azure.com", "sqlx.cosmos.azure.com",
"documents-staging.windows-ppe.net", "documents-staging.windows-ppe.net",
"sql.cosmosdb.windows-ppe.net", "sql.cosmosdb.windows-ppe.net",
src/Platform/Hosted/Helpers/ConnectionStringParser.test.ts
+69 -92
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@@ -11,21 +11,27 @@ describe("ConnectionStringParser", () => {
const mockAccountName = "Test"; const mockAccountName = "Test";
const mockMasterKey = "some-key"; const mockMasterKey = "some-key";
// Keyed by ApiKind so adding an API to the enum fails to compile here rather than silently going // The shape of each api's connection string, parameterized by the dns zone the account sits in. What
// untested. // these tests are about is the zones, so keeping the shapes here stops them being restated once per zone.
const buildConnectionString = {
sql: (zone: string) => `AccountEndpoint=https://${mockAccountName}.${zone}:443/;AccountKey=${mockMasterKey};`,
mongo: (zone: string) => `mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.${zone}:10255`,
// A cassandra connection string can name the account host under either AccountEndpoint or HostName.
cassandra: (zone: string, hostKey = "AccountEndpoint") =>
`${hostKey}=${mockAccountName}.${zone};AccountKey=${mockMasterKey};`,
table: (zone: string) =>
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.${zone}:443/;`,
graph: (zone: string) =>
`AccountEndpoint=https://${mockAccountName}.${zone}:443/;AccountKey=${mockMasterKey};ApiKind=Gremlin;`,
};
const connectionStringsByApiKind: Record<DataModels.ApiKind, string> = { const connectionStringsByApiKind: Record<DataModels.ApiKind, string> = {
[DataModels.ApiKind [DataModels.ApiKind.SQL]: buildConnectionString.sql("documents.azure.com"),
.SQL]: `AccountEndpoint=https://${mockAccountName}.documents.azure.com:443/;AccountKey=${mockMasterKey};`, [DataModels.ApiKind.MongoDB]: buildConnectionString.mongo("documents.azure.com"),
[DataModels.ApiKind [DataModels.ApiKind.MongoDBCompute]: buildConnectionString.mongo("mongo.cosmos.azure.com"),
.MongoDB]: `mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.documents.azure.com:10255`, [DataModels.ApiKind.Cassandra]: buildConnectionString.cassandra("cassandra.cosmosdb.azure.com"),
[DataModels.ApiKind [DataModels.ApiKind.Table]: buildConnectionString.table("table.cosmosdb.azure.com"),
.MongoDBCompute]: `mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.mongo.cosmos.azure.com:10255`, [DataModels.ApiKind.Graph]: buildConnectionString.graph("documents.azure.com"),
[DataModels.ApiKind
.Cassandra]: `AccountEndpoint=${mockAccountName}.cassandra.cosmosdb.azure.com;AccountKey=${mockMasterKey};`,
[DataModels.ApiKind
.Table]: `DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.table.cosmosdb.azure.com:443/;`,
[DataModels.ApiKind
.Graph]: `AccountEndpoint=https://${mockAccountName}.documents.azure.com:443/;AccountKey=${mockMasterKey};ApiKind=Gremlin;`,
}; };
it("should parse a connection string for every api kind", () => { it("should parse a connection string for every api kind", () => {
@@ -44,7 +50,6 @@ describe("ConnectionStringParser", () => {
"documents.azure.com", "documents.azure.com",
"sql.cosmosdb.azure.com", "sql.cosmosdb.azure.com",
"sql.cosmos.azure.com", "sql.cosmos.azure.com",
"sqlx.cosmosdb.azure.com",
"sqlx.cosmos.azure.com", "sqlx.cosmos.azure.com",
"documents-staging.windows-ppe.net", "documents-staging.windows-ppe.net",
"sql.cosmosdb.windows-ppe.net", "sql.cosmosdb.windows-ppe.net",
@@ -67,17 +72,6 @@ describe("ConnectionStringParser", () => {
]); ]);
}); });
it("should parse a valid sql account connection string", () => {
const metadata = parseConnectionString(
`AccountEndpoint=https://${mockAccountName}.documents.azure.com:443/;AccountKey=${mockMasterKey};`,
);
expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.SQL);
expect(metadata.documentEndpoint).toBe(`https://${mockAccountName}.documents.azure.com:443/`);
expect(metadata.apiEndpoint).toBeUndefined();
});
it("should keep the document endpoint given by the connection string", () => { it("should keep the document endpoint given by the connection string", () => {
// The endpoint is taken from the connection string rather than rebuilt from the account name, so a // The endpoint is taken from the connection string rather than rebuilt from the account name, so a
// string that omits the port keeps it omitted. // string that omits the port keeps it omitted.
@@ -91,9 +85,7 @@ describe("ConnectionStringParser", () => {
it.each(configContext.SQL_DNS_ZONES)( it.each(configContext.SQL_DNS_ZONES)(
"should parse a sql account connection string using the %s zone", "should parse a sql account connection string using the %s zone",
(dnsZone: string) => { (dnsZone: string) => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.sql(dnsZone));
`AccountEndpoint=https://${mockAccountName}.${dnsZone}:443/;AccountKey=${mockMasterKey};`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.SQL); expect(metadata.apiKind).toBe(DataModels.ApiKind.SQL);
@@ -102,21 +94,10 @@ describe("ConnectionStringParser", () => {
}, },
); );
it("should parse a valid mongo account connection string", () => {
const metadata = parseConnectionString(
`mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.documents.azure.com:10255`,
);
expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.MongoDB);
});
it.each(configContext.MONGO_DNS_ZONES)( it.each(configContext.MONGO_DNS_ZONES)(
"should parse a mongo account connection string using the %s zone", "should parse a mongo account connection string using the %s zone",
(dnsZone: string) => { (dnsZone: string) => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.mongo(dnsZone));
`mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.${dnsZone}:10255`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.MongoDB); expect(metadata.apiKind).toBe(DataModels.ApiKind.MongoDB);
@@ -126,41 +107,31 @@ describe("ConnectionStringParser", () => {
it.each(configContext.MONGO_COMPUTE_DNS_ZONES)( it.each(configContext.MONGO_COMPUTE_DNS_ZONES)(
"should parse a compute mongo account connection string using the %s zone", "should parse a compute mongo account connection string using the %s zone",
(dnsZone: string) => { (dnsZone: string) => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.mongo(dnsZone));
`mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.${dnsZone}:10255`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.MongoDBCompute); expect(metadata.apiKind).toBe(DataModels.ApiKind.MongoDBCompute);
}, },
); );
it("should parse a valid cassandra account connection string", () => {
const metadata = parseConnectionString(
`AccountEndpoint=${mockAccountName}.cassandra.cosmosdb.azure.com;AccountKey=${mockMasterKey};`,
);
expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.Cassandra);
});
it.each( it.each(
["AccountEndpoint", "HostName"].flatMap((key) => ["AccountEndpoint", "HostName"].flatMap((hostKey) =>
configContext.CASSANDRA_DNS_ZONES.map((dnsZone) => [key, dnsZone]), configContext.CASSANDRA_DNS_ZONES.map((dnsZone) => [hostKey, dnsZone]),
), ),
)("should parse a cassandra account connection string using %s and the %s zone", (key: string, dnsZone: string) => { )(
const metadata = parseConnectionString(`${key}=${mockAccountName}.${dnsZone};AccountKey=${mockMasterKey};`); "should parse a cassandra account connection string using %s and the %s zone",
(hostKey: string, dnsZone: string) => {
const metadata = parseConnectionString(buildConnectionString.cassandra(dnsZone, hostKey));
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.Cassandra); expect(metadata.apiKind).toBe(DataModels.ApiKind.Cassandra);
}); },
);
it.each(configContext.TABLE_DNS_ZONES)( it.each(configContext.TABLE_DNS_ZONES)(
"should parse a table account connection string using the %s zone", "should parse a table account connection string using the %s zone",
(dnsZone: string) => { (dnsZone: string) => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.table(dnsZone));
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.${dnsZone}:443/;`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.Table); expect(metadata.apiKind).toBe(DataModels.ApiKind.Table);
@@ -168,32 +139,42 @@ describe("ConnectionStringParser", () => {
}, },
); );
it("should construct the document endpoint for a table account from the account name", () => { // A Mongo, Cassandra or Table connection string names the account in its own api's dns zone rather than
const metadata = parseConnectionString( // giving the document endpoint, so the document endpoint that data plane operations go through is built
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.table.cosmosdb.azure.com:443/;`, // from the account name, under a zone of the same kind as the one that matched.
); const publicDocumentEndpoint = `https://${mockAccountName}.documents.azure.com:443/`;
const ppeDocumentEndpoint = `https://${mockAccountName}.documents-staging.windows-ppe.net:443/`;
const expectedDocumentEndpointByZone: Record<string, string> = {
"documents.azure.com": publicDocumentEndpoint,
"documents-staging.windows-ppe.net": ppeDocumentEndpoint,
"mongo.cosmos.azure.com": publicDocumentEndpoint,
"mongo.cosmos.windows-ppe.net": ppeDocumentEndpoint,
"cassandra.cosmosdb.azure.com": publicDocumentEndpoint,
"cassandra.cosmos.azure.com": publicDocumentEndpoint,
"cassandra.cosmosdb.windows-ppe.net": ppeDocumentEndpoint,
"cassandra.cosmos.windows-ppe.net": ppeDocumentEndpoint,
"table.cosmosdb.azure.com": publicDocumentEndpoint,
"table.cosmos.azure.com": publicDocumentEndpoint,
"table.cosmosdb.windows-ppe.net": ppeDocumentEndpoint,
"table.cosmos.windows-ppe.net": ppeDocumentEndpoint,
};
// Table connection strings only carry the table endpoint, so the document endpoint that data plane it.each([
// operations go through is built from the account name. ...configContext.MONGO_DNS_ZONES.map((dnsZone) => [dnsZone, buildConnectionString.mongo(dnsZone)]),
expect(metadata.documentEndpoint).toBe(`https://${mockAccountName}.documents.azure.com:443/`); ...configContext.MONGO_COMPUTE_DNS_ZONES.map((dnsZone) => [dnsZone, buildConnectionString.mongo(dnsZone)]),
}); ...configContext.CASSANDRA_DNS_ZONES.map((dnsZone) => [dnsZone, buildConnectionString.cassandra(dnsZone)]),
...configContext.TABLE_DNS_ZONES.map((dnsZone) => [dnsZone, buildConnectionString.table(dnsZone)]),
])(
"should construct the document endpoint for an account in the %s zone",
(dnsZone: string, connectionString: string) => {
const metadata = parseConnectionString(connectionString);
it.each(["table.cosmosdb.windows-ppe.net", "table.cosmos.windows-ppe.net"])( expect(metadata.documentEndpoint).toBe(expectedDocumentEndpointByZone[dnsZone]);
"should construct a PPE document endpoint for a table account in the %s zone",
(dnsZone: string) => {
const metadata = parseConnectionString(
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.${dnsZone}:443/;`,
);
// The constructed endpoint has to match the kind of zone the table endpoint we matched came from.
expect(metadata.documentEndpoint).toBe(`https://${mockAccountName}.documents-staging.windows-ppe.net:443/`);
}, },
); );
it("should parse a valid graph account connection string", () => { it("should parse a valid graph account connection string", () => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.graph("documents.azure.com"));
`AccountEndpoint=https://${mockAccountName}.documents.azure.com:443/;AccountKey=${mockMasterKey};ApiKind=Gremlin;`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.Graph); expect(metadata.apiKind).toBe(DataModels.ApiKind.Graph);
@@ -202,9 +183,7 @@ describe("ConnectionStringParser", () => {
}); });
it("should construct a PPE gremlin endpoint for a PPE graph account", () => { it("should construct a PPE gremlin endpoint for a PPE graph account", () => {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.graph("documents-staging.windows-ppe.net"));
`AccountEndpoint=https://${mockAccountName}.documents-staging.windows-ppe.net:443/;AccountKey=${mockMasterKey};ApiKind=Gremlin;`,
);
expect(metadata.accountName).toBe(mockAccountName); expect(metadata.accountName).toBe(mockAccountName);
expect(metadata.apiKind).toBe(DataModels.ApiKind.Graph); expect(metadata.apiKind).toBe(DataModels.ApiKind.Graph);
@@ -218,9 +197,7 @@ describe("ConnectionStringParser", () => {
updateConfigContext({ DOCUMENT_ENDPOINT_ZONES: ["documents.azure.com"] }); updateConfigContext({ DOCUMENT_ENDPOINT_ZONES: ["documents.azure.com"] });
try { try {
const metadata = parseConnectionString( const metadata = parseConnectionString(buildConnectionString.table("table.cosmos.windows-ppe.net"));
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.table.cosmos.windows-ppe.net:443/;`,
);
// The account key travels to the constructed document endpoint, so a config carrying no PPE zone // The account key travels to the constructed document endpoint, so a config carrying no PPE zone
// has to fail on a PPE account rather than fall back to a zone the account does not own. // has to fail on a PPE account rather than fall back to a zone the account does not own.
@@ -231,11 +208,11 @@ describe("ConnectionStringParser", () => {
}); });
it.each([ it.each([
`AccountEndpoint=https://${mockAccountName}.documents.azure.com.attacker.example:443/;AccountKey=${mockMasterKey};`, buildConnectionString.sql("documents.azure.com.attacker.example"),
`mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.documents.azure.com.attacker.example:10255`, buildConnectionString.mongo("documents.azure.com.attacker.example"),
`mongodb://${mockAccountName}:${mockMasterKey}@${mockAccountName}.mongo.cosmos.azure.com.attacker.example:10255`, buildConnectionString.mongo("mongo.cosmos.azure.com.attacker.example"),
`AccountEndpoint=${mockAccountName}.cassandra.cosmosdb.azure.com.attacker.example;AccountKey=${mockMasterKey};`, buildConnectionString.cassandra("cassandra.cosmosdb.azure.com.attacker.example"),
`DefaultEndpointsProtocol=https;AccountName=${mockAccountName};AccountKey=${mockMasterKey};TableEndpoint=https://${mockAccountName}.table.cosmosdb.azure.com.attacker.example:443/;`, buildConnectionString.table("table.cosmosdb.azure.com.attacker.example"),
])("should not accept a host that only begins with a known zone: %s", (connectionString: string) => { ])("should not accept a host that only begins with a known zone: %s", (connectionString: string) => {
// The zone list is what keeps the account key from being sent somewhere arbitrary, so a host that // The zone list is what keeps the account key from being sent somewhere arbitrary, so a host that
// appends to an allowed zone must not pass as that zone. // appends to an allowed zone must not pass as that zone.
src/Platform/Hosted/Helpers/ConnectionStringParser.ts
+21 -9
View File
@@ -4,7 +4,8 @@ import { AccessInputMetadata, ApiKind } from "../../../Contracts/DataModels";
const PpeDnsSuffix = "windows-ppe.net"; const PpeDnsSuffix = "windows-ppe.net";
const DnsPort = "443"; const DnsPort = "443";
const isPpeZone = (zone: string): boolean => zone.endsWith(PpeDnsSuffix); // Match on a label boundary so a zone like "notwindows-ppe.net" is not taken for a PPE zone.
const isPpeZone = (zone: string): boolean => zone === PpeDnsSuffix || zone.endsWith(`.${PpeDnsSuffix}`);
// Picks the DNS zone matching the kind of account the connection string came from, since a PPE // Picks the DNS zone matching the kind of account the connection string came from, since a PPE
// account's endpoints sit under PPE zones and every other account's do not. Returns undefined when the // account's endpoints sit under PPE zones and every other account's do not. Returns undefined when the
@@ -16,9 +17,10 @@ export const selectEndpointZone = (zones: ReadonlyArray<string>, isPpeAccount: b
// Builds an alternation matching any of the given DNS zones, e.g. "(documents\.azure\.com|sql\.cosmos\.azure\.com)". // Builds an alternation matching any of the given DNS zones, e.g. "(documents\.azure\.com|sql\.cosmos\.azure\.com)".
// The group captures so callers can tell which zone matched, and with it whether the account is a PPE account. // The group captures so callers can tell which zone matched, and with it whether the account is a PPE account.
// The zone has to run to the end of the host, otherwise a host that merely starts with an allowed zone // The zone has to run to the end of the host, otherwise a host that merely starts with an allowed zone
// would pass as that zone and the account key would travel to whatever was appended to it. // would pass as that zone and the account key would travel to whatever was appended to it. Zones come
// from config, so every regex metacharacter is escaped rather than just the dots.
export const dnsZoneAlternation = (zones: ReadonlyArray<string>): string => export const dnsZoneAlternation = (zones: ReadonlyArray<string>): string =>
`(${zones.map((zone) => zone.replace(/\./g, "\\.")).join("|")})(?=[:/\\s]|$)`; `(${zones.map((zone) => zone.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")).join("|")})(?=[:/\\s]|$)`;
// The zone lists live in ConfigContext, which is populated asynchronously by initializeConfiguration, // The zone lists live in ConfigContext, which is populated asynchronously by initializeConfiguration,
// so these are built per call rather than once at module load. // so these are built per call rather than once at module load.
@@ -55,15 +57,19 @@ export function parseConnectionString(connectionString: string): AccessInputMeta
const matches: string[] = connectionStringPart.match(endpointsRegex.mongo); const matches: string[] = connectionStringPart.match(endpointsRegex.mongo);
accessInput.accountName = matches && matches.length > 1 && matches[2]; accessInput.accountName = matches && matches.length > 1 && matches[2];
accessInput.apiKind = ApiKind.MongoDB; accessInput.apiKind = ApiKind.MongoDB;
isPpeAccount = isPpeZone(matches[3]);
} else if (RegExp(endpointsRegex.mongoCompute).test(connectionStringPart)) { } else if (RegExp(endpointsRegex.mongoCompute).test(connectionStringPart)) {
const matches: string[] = connectionStringPart.match(endpointsRegex.mongoCompute); const matches: string[] = connectionStringPart.match(endpointsRegex.mongoCompute);
accessInput.accountName = matches && matches.length > 1 && matches[2]; accessInput.accountName = matches && matches.length > 1 && matches[2];
accessInput.apiKind = ApiKind.MongoDBCompute; accessInput.apiKind = ApiKind.MongoDBCompute;
isPpeAccount = isPpeZone(matches[3]);
} else if (endpointsRegex.cassandra.some((regex) => RegExp(regex).test(connectionStringPart))) { } else if (endpointsRegex.cassandra.some((regex) => RegExp(regex).test(connectionStringPart))) {
endpointsRegex.cassandra.forEach((regex) => { endpointsRegex.cassandra.forEach((regex) => {
if (RegExp(regex).test(connectionStringPart)) { const matches: string[] = connectionStringPart.match(regex);
accessInput.accountName = connectionStringPart.match(regex)[1]; if (matches) {
accessInput.accountName = matches[1];
accessInput.apiKind = ApiKind.Cassandra; accessInput.apiKind = ApiKind.Cassandra;
isPpeAccount = isPpeZone(matches[2]);
} }
}); });
} else if (RegExp(endpointsRegex.table).test(connectionStringPart)) { } else if (RegExp(endpointsRegex.table).test(connectionStringPart)) {
@@ -80,11 +86,17 @@ export function parseConnectionString(connectionString: string): AccessInputMeta
return undefined; return undefined;
} }
// Table connection strings only carry the table endpoint, so the document endpoint that data plane // A Table, Mongo or Cassandra connection string names the account in its own api's dns zone rather
// operations go through has to be derived from the account name. Gremlin accounts additionally // than giving the document endpoint, so the document endpoint that data plane operations go through
// need the Gremlin endpoint, which is never part of the connection string. // has to be built from the account name. SQL and Gremlin strings carry it and take it as given.
// Gremlin additionally needs the Gremlin endpoint, which is never part of the connection string.
if (accessInput.accountName) { if (accessInput.accountName) {
if (accessInput.apiKind === ApiKind.Table) { if (
accessInput.apiKind === ApiKind.Table ||
accessInput.apiKind === ApiKind.MongoDB ||
accessInput.apiKind === ApiKind.MongoDBCompute ||
accessInput.apiKind === ApiKind.Cassandra
) {
const documentEndpointZone = selectEndpointZone(configContext.DOCUMENT_ENDPOINT_ZONES, isPpeAccount); const documentEndpointZone = selectEndpointZone(configContext.DOCUMENT_ENDPOINT_ZONES, isPpeAccount);
if (!documentEndpointZone) { if (!documentEndpointZone) {
return undefined; return undefined;