Abstract: A virtual network verification service for provider networks that leverages a declarative logic programming language to allow clients to pose queries about their virtual networks as constraint problems; the queries may be resolved using a constraint solver engine. Semantics and logic for networking primitives of virtual networks in the provider network environment may be encoded as a set of rules according to the logic programming language; networking security standards and/or client-defined rules may also be encoded in the rules. A description of a virtual network may be obtained and encoded. A constraint problem expressed by a query may then be resolved for the encoded description according to the encoded rules using the constraint solver engine; the results may be provided to the client.

Abstract: Disclosed are systems and methods that determine specification portions of Dafny code and transform those specifications into one or more annotations, expressions, comments, and/or assertions that are included in a destination code written in a destination language as part of a compilation of the Dafny code into the destination code. The annotations, expressions, comments, and/or assertions in the destination code may be utilized by a verification component, such as a Checker Framework, to detect errors that are introduced into the destination code by the compiler as part of the compilation or to verify the absence of errors in the destination code.

Abstract: A software development process may support a transition from unverifiable, legacy code to verifiable code that is provably correct by construction. A behavioral model may be developed for legacy software that includes various behavioral criteria. Then, source code implemented in a verifiable language may be verified using the behavioral model to perform verification. Once the source code is complete and verified, a new verified implementation may be compiled. The verified implementation may then be executed, along with the legacy software, to identify differences in behavior which are fed back into the behavioral model and subsequently into the new source code. This process may then be iterated with the verifiable code being deployable once behavioral differences are resolved.

Abstract: Resource state validation may be performed for access management policies by an identity and access management system. An access management policy associated with an account for network-based services may be received and validated according to resource state obtained for resources associated with the account. A correction for a portion of the access management policy may be identified according to the validation and provided via an interface for the identity and access management system.

Abstract: Methods, systems, and computer-readable media for automated packetless network reachability analysis are disclosed. An analysis is performed of network configuration data for a network comprising a host computer. Based at least in part on the analysis, one or more ports at the host computer that are reachable from another computer are determined. Based at least in part on the analysis, one or more routes to the one or more ports are determined. A report is generated that is descriptive of the one or more ports and the one or more routes.

Abstract: Methods, systems, and computer-readable media for automated packetless network reachability analysis are disclosed. An analysis is performed of network configuration data for a network comprising a host computer. Based at least in part on the analysis, one or more ports at the host computer that are reachable from another computer are determined. Based at least in part on the analysis, one or more routes to the one or more ports are determined. A report is generated that is descriptive of the one or more ports and the one or more routes.

Abstract: Resource state validation may be performed for access management policies by an identity and access management system. An access management policy associated with an account for network-based services may be received and validated according to resource state obtained for resources associated with the account. A correction for a portion of the access management policy may be identified according to the validation and provided via an interface for the identity and access management system.

Abstract: A method for verifying source code for a program includes determining that a new version of the source code is available. One or more verification tools are determined to use for verification of the new version of the source code from a verification specification associated with the source code. A plurality of verification tasks to perform for the verification of the new version of the source code are automatically determined from the verification specification associated with the source code. The plurality of verification tasks for the new version of the source code are automatically performed using the one or more verification tools. A determination is then made as to whether the new version of the source code is verified.

Abstract: Resource state validation may be performed for access management policies by an identity and access management system. An access management policy associated with an account for network-based services may be received and validated according to resource state obtained for resources associated with the account. A correction for a portion of the access management policy may be identified according to the validation and provided via an interface for the identity and access management system.

Abstract: Methods, systems, and computer-readable media for automated packetless network reachability analysis are disclosed. An analysis is performed of network configuration data for a network comprising a host computer. Based at least in part on the analysis, one or more ports at the host computer that are reachable from another computer are determined. Based at least in part on the analysis, one or more routes to the one or more ports are determined. A report is generated that is descriptive of the one or more ports and the one or more routes.

Abstract: A virtual network verification service for provider networks that leverages a declarative logic programming language to allow clients to pose queries about their virtual networks as constraint problems; the queries may be resolved using a constraint solver engine. Semantics and logic for networking primitives of virtual networks in the provider network environment may be encoded as a set of rules according to the logic programming language; networking security standards and/or client-defined rules may also be encoded in the rules. A description of a virtual network may be obtained and encoded. A constraint problem expressed by a query may then be resolved for the encoded description according to the encoded rules using the constraint solver engine; the results may be provided to the client.

Abstract: Methods, systems, and computer-readable media for automated packetless network reachability analysis are disclosed. An analysis is performed of network configuration data for a network comprising a host computer. Based at least in part on the analysis, one or more ports at the host computer that are reachable from another computer are determined. Based at least in part on the analysis, one or more routes to the one or more ports are determined. A report is generated that is descriptive of the one or more ports and the one or more routes.

Abstract: A virtual network verification service for provider networks that leverages a declarative logic programming language to allow clients to pose queries about their virtual networks as constraint problems; the queries may be resolved using a constraint solver engine. Semantics and logic for networking primitives of virtual networks in the provider network environment may be encoded as a set of rules according to the logic programming language; networking security standards and/or client-defined rules may also be encoded in the rules. A description of a virtual network may be obtained and encoded. A constraint problem expressed by a query may then be resolved for the encoded description according to the encoded rules using the constraint solver engine; the results may be provided to the client.

Abstract: A constraint solver service of a computing resource service provider performs evaluations of logic problems provided by the service provider's users and/or services by deploying a plurality of constraint solvers to concurrently evaluate the logic problem. Each deployed solver has, or is configured with, different characteristics and/or capabilities than the other solvers; thus, the solvers can have varying execution times and ways of finding a solution. The service may control execution of the solvers using virtual computing resources, such as by installing and configuring a solver to execute in a software container instance. The service receives solver results and delivers them according to a solution strategy such as “first received” to reduce latency or “check for agreement” to validate the solution. An interface allows the provider of the logic problem to select and configure solvers, issue commands and modifications during solver execution, select the solution strategy, and receive the solution.

Abstract: A method for verifying source code for a program includes determining that a new version of the source code is available. One or more verification tools are determined to use for verification of the new version of the source code from a verification specification associated with the source code. A plurality of verification tasks to perform for the verification of the new version of the source code are automatically determined from the verification specification associated with the source code. The plurality of verification tasks for the new version of the source code are automatically performed using the one or more verification tools. A determination is then made as to whether the new version of the source code is verified.

Abstract: A method for verifying source code for a program includes determining that a new version of the source code is available. One or more verification tools are determined to use for verification of the new version of the source code from a verification specification associated with the source code. A plurality of verification tasks to perform for the verification of the new version of the source code are automatically determined from the verification specification associated with the source code. The plurality of verification tasks for the new version of the source code are automatically performed using the one or more verification tools. A determination is then made as to whether the new version of the source code is verified.

Abstract: A constraint solver service of a computing resource service provider performs evaluations of logic problems provided by the service provider's users and/or services by deploying a plurality of constraint solvers to concurrently evaluate the logic problem. Each deployed solver has, or is configured with, different characteristics and/or capabilities than the other solvers; thus, the solvers can have varying execution times and ways of finding a solution. The service may control execution of the solvers using virtual computing resources, such as by installing and configuring a solver to execute in a software container instance. The service receives solver results and delivers them according to a solution strategy such as “first received” to reduce latency or “check for agreement” to validate the solution. An interface allows the provider of the logic problem to select and configure solvers, issue commands and modifications during solver execution, select the solution strategy, and receive the solution.

Abstract: A method for verifying source code for a program includes determining that a new version of the source code is available. One or more verification tools are determined to use for verification of the new version of the source code from a verification specification associated with the source code. A plurality of verification tasks to perform for the verification of the new version of the source code are automatically determined from the verification specification associated with the source code. The plurality of verification tasks for the new version of the source code are automatically performed using the one or more verification tools. A determination is then made as to whether the new version of the source code is verified.

Abstract: A virtual network verification service for provider networks that leverages a declarative logic programming language to allow clients to pose queries about their virtual networks as constraint problems; the queries may be resolved using a constraint solver engine. Semantics and logic for networking primitives of virtual networks in the provider network environment may be encoded as a set of rules according to the logic programming language; networking security standards and/or client-defined rules may also be encoded in the rules. A description of a virtual network may be obtained and encoded. A constraint problem expressed by a query may then be resolved for the encoded description according to the encoded rules using the constraint solver engine; the results may be provided to the client.

Abstract: Methods, systems, and computer-readable media for automated packetless network reachability analysis are disclosed. An analysis is performed of network configuration data for a network comprising a host computer. Based at least in part on the analysis, one or more ports at the host computer that are reachable from another computer are determined. Based at least in part on the analysis, one or more routes to the one or more ports are determined. A report is generated that is descriptive of the one or more ports and the one or more routes.