Authenticating Event Hubs publishers with SAS An event publisher defines a virtual endpoint for an event hub. The publisher can only be used to send messages to an event hub and not receive messages. Typically, an event hub employs one publisher per client.
- Event Hubs For Apache Kafka
- Event Publishers
- SAS Tokens
- Event Consumers
- Next Steps
An Event Hubs namespace provides a unique scoping container, referenced by its fully qualified domain name, in which you create one or more event hubs or Kafka topics.
This feature provides an endpoint that enables customers to talk to Event Hubs using the Kafka protocol. This integration provides customers a Kafka endpoint. This enables customers to configure their existing Kafka applications to talk to Event Hubs, giving an alternative to running their own Kafka clusters. Event Hubs for Apache Kafka supports Kafka protocol 1.0 and later.With this integration, you don't need to run Kafka clusters or manage them with Zookeeper. This also allows you to work...
Any entity that sends data to an event hub is an event producer, or event publisher. Event publishers can publish events using HTTPS or AMQP 1.0 or Kafka 1.0 and later. Event publishers use a Shared Access Signature (SAS) token to identify themselves to an event hub, and can have a unique identity, or use a common SAS token.
Event Hubs Capture enables you to automatically capture the streaming data in Event Hubs and save it to your choice of either a Blob storage account, or an Azure Data Lake Service account. You can enable Capture from the Azure portal, and specify a minimum size and time window to perform the capture. Using Event Hubs Capture, you specify your own Azure Blob Storage account and container, or Azure Data Lake Service account, one of which is used to store the captured data. Captured data is writ...
Event Hubs provides message streaming through a partitioned consumer pattern in which each consumer only reads a specific subset, or partition, of the message stream. This pattern enables horizontal scale for event processing and provides other stream-focused features that are unavailable in queues and topics.A partition is an ordered sequence of events that is held in an event hub. As newer events arrive, they are added to the end of this sequence. A partition can be thought of as a \\"commit...
Event Hubs uses Shared Access Signatures, which are available at the namespace and event hub level. A SAS token is generated from a SAS key and is an SHA hash of a URL, encoded in a specific format. Using the name of the key (policy) and the token, Event Hubs can regenerate the hash and thus authenticate the sender. Normally, SAS tokens for event publishers are created with only send privileges on a specific event hub. This SAS token URL mechanism is the basis for publisher identification int...
Any entity that reads event data from an event hub is an event consumer. All Event Hubs consumers connect via the AMQP 1.0 session and events are delivered through the session as they become available. The client does not need to poll for data availability.
For more information about Event Hubs, visit the following links: 1. Get started with an Event Hubs tutorial 2. Event Hubs programming guide 3. Availability and consistency in Event Hubs 4. Event Hubs FAQ 5. Event Hubs samples
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Event Hubs is a fully managed, real-time data ingestion service that’s simple, trusted, and scalable. Stream millions of events per second from any source to build dynamic data pipelines and immediately respond to business challenges. Keep processing data during emergencies using the geo-disaster recovery and geo-replication features.
- Azure Active Directory
- Shared Access Signatures
- Next Steps
Azure Active Directory (Azure AD) integration for Event Hubs resources provides role-based access control (RBAC) for fine-grained control over a client's access to resources. You can use role-based access control (RBAC) to grant permissions to security principal, which may be a user, a group, or an application service principal. The security principal is authenticated by Azure AD to return an OAuth 2.0 token. The token can be used to authorize a request to access an Event Hubs resource. For more information about authenticating with Azure AD, see the following articles: 1. Authenticate requests to Azure Event Hubs using Azure Active Directory 2. Authorize access to Event Hubs resources using Azure Active Directory.
Shared access signatures (SAS) for Event Hubs resources provide limited delegated access to Event Hubs resources. Adding constraints on time interval for which the signature is valid or on permissions it grants provides flexibility in managing resources. For more information, see Authenticate using shared access signatures (SAS). Authorizing users or applications using an OAuth 2.0 token returned by Azure AD provides superior security and ease of use over shared access signatures (SAS). With Azure AD, there's no need to store the access tokens with your code and risk potential security vulnerabilities. While you can continue to use shared access signatures (SAS) to grant fine-grained access to Event Hubs resources, Azure AD offers similar capabilities without the need to manage SAS tokens or worry about revoking a compromised SAS. By default, all Event Hubs resources are secured, and are available only to the account owner. Although you can use any of the authorization strategies ou...Review RBAC samplespublished in our GitHub repository.See the following articles:
- Service Tags
- IP Firewall
- Network Service Endpoints
- Private Endpoints
A service tag represents a group of IP address prefixes from a given Azure service. Microsoft manages the address prefixes encompassed by the service tag and automatically updates the service tag as addresses change, minimizing the complexity of frequent updates to network security rules. For more information about service tags, see Service tags overview. You can use service tags to define network access controls on network security groups or Azure Firewall. Use service tags in place of specific IP addresses when you create security rules. By specifying the service tag name (for example, EventHub) in the appropriate source or destinationfield of a rule, you can allow or deny the traffic for the corresponding service.
By default, Event Hubs namespaces are accessible from internet as long as the request comes with valid authentication and authorization. With IP firewall, you can restrict it further to only a set of IPv4 addresses or IPv4 address ranges in CIDR (Classless Inter-Domain Routing)notation. This feature is helpful in scenarios in which Azure Event Hubs should be only accessible from certain well-known sites. Firewall rules enable you to configure rules to accept traffic originating from specific IPv4 addresses. For example, if you use Event Hubs with Azure Express Route, you can create a firewall ruleto allow traffic from only your on-premises infrastructure IP addresses. The IP firewall rules are applied at the Event Hubs namespace level. Therefore, the rules apply to all connections from clients using any supported protocol. Any connection attempt from an IP address that does not match an allowed IP rule on the Event Hubs namespace is rejected as unauthorized. The response does not me...
The integration of Event Hubs with Virtual Network (VNet) Service Endpointsenables secure access to messaging capabilities from workloads such as virtual machines that are bound to virtual networks, with the network traffic path being secured on both ends. Once configured to bound to at least one virtual network subnet service endpoint, the respective Event Hubs namespace no longer accepts traffic from anywhere but authorized subnets in virtual networks. From the virtual network perspective, binding an Event Hubs namespace to a service endpoint configures an isolated networking tunnel from the virtual network subnet to the messaging service. The result is a private and isolated relationship between the workloads bound to the subnet and the respective Event Hubs namespace, in spite of the observable network address of the messaging service endpoint being in a public IP range. There is an exception to this behavior. Enabling a service endpoint, by default, enables the denyall rule in...
Azure Private Link service enables you to access Azure Services (for example, Azure Event Hubs, Azure Storage, and Azure Cosmos DB) and Azure hosted customer/partner services over a private endpointin your virtual network. A private endpoint is a network interface that connects you privately and securely to a service powered by Azure Private Link. The private endpoint uses a private IP address from your VNet, effectively bringing the service into your VNet. All traffic to the service can be routed through the private endpoint, so no gateways, NAT devices, ExpressRoute or VPN connections, or public IP addresses are needed. Traffic between your virtual network and the service traverses over the Microsoft backbone network, eliminating exposure from the public Internet. You can connect to an instance of an Azure resource, giving you the highest level of granularity in access control. For more information, see How to configure private endpoints for an event hub
Event Hubs, in a nutshell, is a large scale, very-high throughput, highly durable event ingestion pipeline. Events/incoming data can come from a wide variety of sources – like, diagnostic logs published from web roles, device telemetry flowing from devices (all-the-way to cloud, in IoT scenarios) etc.
SAS depends on clocks being in sync. If there are any differences between where you're generating timestamp and event hub, timing might not line up the way you expect it to. As a workaround, sometimes people buffer SAS start/end by a short amount of time, to account for clock drift.
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To make a HTTP request to an Event Hubs endpoint a "Authorization" property must be added to the headers of the request. IMPORTANT URL encode the hash before using it in the token The value of the authorization property is formatted as