open-consul/agent/consul/catalog_endpoint.go

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package consul
import (
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"fmt"
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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"sort"
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"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/acl"
pkg refactor command/agent/* -> agent/* command/consul/* -> agent/consul/* command/agent/command{,_test}.go -> command/agent{,_test}.go command/base/command.go -> command/base.go command/base/* -> command/* commands.go -> command/commands.go The script which did the refactor is: ( cd $GOPATH/src/github.com/hashicorp/consul git mv command/agent/command.go command/agent.go git mv command/agent/command_test.go command/agent_test.go git mv command/agent/flag_slice_value{,_test}.go command/ git mv command/agent . git mv command/base/command.go command/base.go git mv command/base/config_util{,_test}.go command/ git mv commands.go command/ git mv consul agent rmdir command/base/ gsed -i -e 's|package agent|package command|' command/agent{,_test}.go gsed -i -e 's|package agent|package command|' command/flag_slice_value{,_test}.go gsed -i -e 's|package base|package command|' command/base.go command/config_util{,_test}.go gsed -i -e 's|package main|package command|' command/commands.go gsed -i -e 's|base.Command|BaseCommand|' command/commands.go gsed -i -e 's|agent.Command|AgentCommand|' command/commands.go gsed -i -e 's|\tCommand:|\tBaseCommand:|' command/commands.go gsed -i -e 's|base\.||' command/commands.go gsed -i -e 's|command\.||' command/commands.go gsed -i -e 's|command|c|' main.go gsed -i -e 's|range Commands|range command.Commands|' main.go gsed -i -e 's|Commands: Commands|Commands: command.Commands|' main.go gsed -i -e 's|base\.BoolValue|BoolValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.DurationValue|DurationValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.StringValue|StringValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.UintValue|UintValue|' command/operator_autopilot_set.go gsed -i -e 's|\bCommand\b|BaseCommand|' command/base.go gsed -i -e 's|BaseCommand Options|Command Options|' command/base.go gsed -i -e 's|base.Command|BaseCommand|' command/*.go gsed -i -e 's|c\.Command|c.BaseCommand|g' command/*.go gsed -i -e 's|\tCommand:|\tBaseCommand:|' command/*_test.go gsed -i -e 's|base\.||' command/*_test.go gsed -i -e 's|\bCommand\b|AgentCommand|' command/agent{,_test}.go gsed -i -e 's|cmd.AgentCommand|cmd.BaseCommand|' command/agent.go gsed -i -e 's|cli.AgentCommand = new(Command)|cli.Command = new(AgentCommand)|' command/agent_test.go gsed -i -e 's|exec.AgentCommand|exec.Command|' command/agent_test.go gsed -i -e 's|exec.BaseCommand|exec.Command|' command/agent_test.go gsed -i -e 's|NewTestAgent|agent.NewTestAgent|' command/agent_test.go gsed -i -e 's|= TestConfig|= agent.TestConfig|' command/agent_test.go gsed -i -e 's|: RetryJoin|: agent.RetryJoin|' command/agent_test.go gsed -i -e 's|\.\./\.\./|../|' command/config_util_test.go gsed -i -e 's|\bverifyUniqueListeners|VerifyUniqueListeners|' agent/config{,_test}.go command/agent.go gsed -i -e 's|\bserfLANKeyring\b|SerfLANKeyring|g' agent/{agent,keyring,testagent}.go command/agent.go gsed -i -e 's|\bserfWANKeyring\b|SerfWANKeyring|g' agent/{agent,keyring,testagent}.go command/agent.go gsed -i -e 's|\bNewAgent\b|agent.New|g' command/agent{,_test}.go gsed -i -e 's|\bNewAgent|New|' agent/{acl_test,agent,testagent}.go gsed -i -e 's|\bAgent\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bBool\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bDefaultConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bDevConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bMergeConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bReadConfigPaths\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bParseMetaPair\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bSerfLANKeyring\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bSerfWANKeyring\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|circonus\.agent|circonus|g' command/agent{,_test}.go gsed -i -e 's|logger\.agent|logger|g' command/agent{,_test}.go gsed -i -e 's|metrics\.agent|metrics|g' command/agent{,_test}.go gsed -i -e 's|// agent.Agent|// agent|' command/agent{,_test}.go gsed -i -e 's|a\.agent\.Config|a.Config|' command/agent{,_test}.go gsed -i -e 's|agent\.AppendSliceValue|AppendSliceValue|' command/{configtest,validate}.go gsed -i -e 's|consul/consul|agent/consul|' GNUmakefile gsed -i -e 's|\.\./test|../../test|' agent/consul/server_test.go # fix imports f=$(grep -rl 'github.com/hashicorp/consul/command/agent' * | grep '\.go') gsed -i -e 's|github.com/hashicorp/consul/command/agent|github.com/hashicorp/consul/agent|' $f goimports -w $f f=$(grep -rl 'github.com/hashicorp/consul/consul' * | grep '\.go') gsed -i -e 's|github.com/hashicorp/consul/consul|github.com/hashicorp/consul/agent/consul|' $f goimports -w $f goimports -w command/*.go main.go )
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"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/ipaddr"
"github.com/hashicorp/consul/types"
bexpr "github.com/hashicorp/go-bexpr"
"github.com/hashicorp/go-memdb"
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"github.com/hashicorp/go-uuid"
)
// Catalog endpoint is used to manipulate the service catalog
type Catalog struct {
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srv *Server
}
// nodePreApply does the verification of a node before it is applied to Raft.
func nodePreApply(nodeName, nodeID string) error {
if nodeName == "" {
return fmt.Errorf("Must provide node")
}
if nodeID != "" {
if _, err := uuid.ParseUUID(nodeID); err != nil {
return fmt.Errorf("Bad node ID: %v", err)
}
}
return nil
}
func servicePreApply(service *structs.NodeService, rule acl.Authorizer) error {
// Validate the service. This is in addition to the below since
// the above just hasn't been moved over yet. We should move it over
// in time.
if err := service.Validate(); err != nil {
return err
}
// If no service id, but service name, use default
if service.ID == "" && service.Service != "" {
service.ID = service.Service
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}
// Verify ServiceName provided if ID.
if service.ID != "" && service.Service == "" {
return fmt.Errorf("Must provide service name with ID")
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}
// Check the service address here and in the agent endpoint
// since service registration isn't synchronous.
if ipaddr.IsAny(service.Address) {
return fmt.Errorf("Invalid service address")
}
// Apply the ACL policy if any. The 'consul' service is excluded
// since it is managed automatically internally (that behavior
// is going away after version 0.8). We check this same policy
// later if version 0.8 is enabled, so we can eventually just
// delete this and do all the ACL checks down there.
if service.Service != structs.ConsulServiceName {
if rule != nil && !rule.ServiceWrite(service.Service, nil) {
return acl.ErrPermissionDenied
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}
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}
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// Proxies must have write permission on their destination
if service.Kind == structs.ServiceKindConnectProxy {
if rule != nil && !rule.ServiceWrite(service.Proxy.DestinationServiceName, nil) {
return acl.ErrPermissionDenied
}
}
return nil
}
// checkPreApply does the verification of a check before it is applied to Raft.
func checkPreApply(check *structs.HealthCheck) {
if check.CheckID == "" && check.Name != "" {
check.CheckID = types.CheckID(check.Name)
}
}
// Register is used register that a node is providing a given service.
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func (c *Catalog) Register(args *structs.RegisterRequest, reply *struct{}) error {
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if done, err := c.srv.forward("Catalog.Register", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"catalog", "register"}, time.Now())
// Fetch the ACL token, if any.
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
// Verify the args.
if err := nodePreApply(args.Node, string(args.ID)); err != nil {
return err
}
if args.Address == "" && !args.SkipNodeUpdate {
return fmt.Errorf("Must provide address if SkipNodeUpdate is not set")
}
// Handle a service registration.
if args.Service != nil {
if err := servicePreApply(args.Service, rule); err != nil {
return err
}
}
// Move the old format single check into the slice, and fixup IDs.
if args.Check != nil {
args.Checks = append(args.Checks, args.Check)
args.Check = nil
}
for _, check := range args.Checks {
if check.Node == "" {
check.Node = args.Node
}
checkPreApply(check)
}
// Check the complete register request against the given ACL policy.
if rule != nil && c.srv.config.ACLEnforceVersion8 {
state := c.srv.fsm.State()
_, ns, err := state.NodeServices(nil, args.Node)
if err != nil {
return fmt.Errorf("Node lookup failed: %v", err)
}
if err := vetRegisterWithACL(rule, args, ns); err != nil {
return err
}
}
resp, err := c.srv.raftApply(structs.RegisterRequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
return nil
}
// Deregister is used to remove a service registration for a given node.
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func (c *Catalog) Deregister(args *structs.DeregisterRequest, reply *struct{}) error {
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if done, err := c.srv.forward("Catalog.Deregister", args, args, reply); done {
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return err
}
defer metrics.MeasureSince([]string{"catalog", "deregister"}, time.Now())
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// Verify the args
if args.Node == "" {
return fmt.Errorf("Must provide node")
}
// Fetch the ACL token, if any.
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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rule, err := c.srv.ResolveToken(args.Token)
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if err != nil {
return err
}
// Check the complete deregister request against the given ACL policy.
if rule != nil && c.srv.config.ACLEnforceVersion8 {
state := c.srv.fsm.State()
var ns *structs.NodeService
if args.ServiceID != "" {
_, ns, err = state.NodeService(args.Node, args.ServiceID)
if err != nil {
return fmt.Errorf("Service lookup failed: %v", err)
}
}
var nc *structs.HealthCheck
if args.CheckID != "" {
_, nc, err = state.NodeCheck(args.Node, args.CheckID)
if err != nil {
return fmt.Errorf("Check lookup failed: %v", err)
}
}
if err := vetDeregisterWithACL(rule, args, ns, nc); err != nil {
return err
}
}
if _, err := c.srv.raftApply(structs.DeregisterRequestType, args); err != nil {
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return err
}
return nil
}
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// ListDatacenters is used to query for the list of known datacenters
func (c *Catalog) ListDatacenters(args *struct{}, reply *[]string) error {
dcs, err := c.srv.router.GetDatacentersByDistance()
if err != nil {
return err
}
if len(dcs) == 0 { // no WAN federation, so return the local data center name
dcs = []string{c.srv.config.Datacenter}
}
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*reply = dcs
return nil
}
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// ListNodes is used to query the nodes in a DC
func (c *Catalog) ListNodes(args *structs.DCSpecificRequest, reply *structs.IndexedNodes) error {
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if done, err := c.srv.forward("Catalog.ListNodes", args, args, reply); done {
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return err
}
filter, err := bexpr.CreateFilter(args.Filter, nil, reply.Nodes)
if err != nil {
return err
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
var index uint64
var nodes structs.Nodes
var err error
if len(args.NodeMetaFilters) > 0 {
index, nodes, err = state.NodesByMeta(ws, args.NodeMetaFilters)
} else {
index, nodes, err = state.Nodes(ws)
}
if err != nil {
return err
}
reply.Index, reply.Nodes = index, nodes
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
raw, err := filter.Execute(reply.Nodes)
if err != nil {
return err
}
reply.Nodes = raw.(structs.Nodes)
return c.srv.sortNodesByDistanceFrom(args.Source, reply.Nodes)
})
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}
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// ListServices is used to query the services in a DC
func (c *Catalog) ListServices(args *structs.DCSpecificRequest, reply *structs.IndexedServices) error {
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if done, err := c.srv.forward("Catalog.ListServices", args, args, reply); done {
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return err
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
var index uint64
var services structs.Services
var err error
if len(args.NodeMetaFilters) > 0 {
index, services, err = state.ServicesByNodeMeta(ws, args.NodeMetaFilters)
} else {
index, services, err = state.Services(ws)
}
if err != nil {
return err
}
reply.Index, reply.Services = index, services
return c.srv.filterACL(args.Token, reply)
})
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}
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// ServiceNodes returns all the nodes registered as part of a service
func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *structs.IndexedServiceNodes) error {
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if done, err := c.srv.forward("Catalog.ServiceNodes", args, args, reply); done {
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return err
}
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// Verify the arguments
if args.ServiceName == "" && args.ServiceAddress == "" {
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return fmt.Errorf("Must provide service name")
}
// Determine the function we'll call
var f func(memdb.WatchSet, *state.Store) (uint64, structs.ServiceNodes, error)
switch {
case args.Connect:
f = func(ws memdb.WatchSet, s *state.Store) (uint64, structs.ServiceNodes, error) {
return s.ConnectServiceNodes(ws, args.ServiceName)
}
default:
f = func(ws memdb.WatchSet, s *state.Store) (uint64, structs.ServiceNodes, error) {
if args.ServiceAddress != "" {
return s.ServiceAddressNodes(ws, args.ServiceAddress)
}
if args.TagFilter {
tags := args.ServiceTags
// DEPRECATED (singular-service-tag) - remove this when backwards RPC compat
// with 1.2.x is not required.
// Agents < v1.3.0 populate the ServiceTag field. In this case,
// use ServiceTag instead of the ServiceTags field.
if args.ServiceTag != "" {
tags = []string{args.ServiceTag}
}
return s.ServiceTagNodes(ws, args.ServiceName, tags)
}
return s.ServiceNodes(ws, args.ServiceName)
}
}
// If we're doing a connect query, we need read access to the service
// we're trying to find proxies for, so check that.
if args.Connect {
// Fetch the ACL token, if any.
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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rule, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if rule != nil && !rule.ServiceRead(args.ServiceName) {
// Just return nil, which will return an empty response (tested)
return nil
}
}
filter, err := bexpr.CreateFilter(args.Filter, nil, reply.ServiceNodes)
if err != nil {
return err
}
err = c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
index, services, err := f(ws, state)
if err != nil {
return err
}
reply.Index, reply.ServiceNodes = index, services
if len(args.NodeMetaFilters) > 0 {
var filtered structs.ServiceNodes
for _, service := range services {
if structs.SatisfiesMetaFilters(service.NodeMeta, args.NodeMetaFilters) {
filtered = append(filtered, service)
}
}
reply.ServiceNodes = filtered
}
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
// This is safe to do even when the filter is nil - its just a no-op then
raw, err := filter.Execute(reply.ServiceNodes)
if err != nil {
return err
}
reply.ServiceNodes = raw.(structs.ServiceNodes)
return c.srv.sortNodesByDistanceFrom(args.Source, reply.ServiceNodes)
})
// Provide some metrics
if err == nil {
// For metrics, we separate Connect-based lookups from non-Connect
key := "service"
if args.Connect {
key = "connect"
}
metrics.IncrCounterWithLabels([]string{"catalog", key, "query"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}})
// DEPRECATED (singular-service-tag) - remove this when backwards RPC compat
// with 1.2.x is not required.
if args.ServiceTag != "" {
metrics.IncrCounterWithLabels([]string{"catalog", key, "query-tag"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}, {Name: "tag", Value: args.ServiceTag}})
}
if len(args.ServiceTags) > 0 {
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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// Sort tags so that the metric is the same even if the request
// tags are in a different order
sort.Strings(args.ServiceTags)
// Build metric labels
labels := []metrics.Label{{Name: "service", Value: args.ServiceName}}
for _, tag := range args.ServiceTags {
labels = append(labels, metrics.Label{Name: "tag", Value: tag})
}
metrics.IncrCounterWithLabels([]string{"catalog", key, "query-tags"}, 1, labels)
}
if len(reply.ServiceNodes) == 0 {
metrics.IncrCounterWithLabels([]string{"catalog", key, "not-found"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}})
}
}
return err
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}
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// NodeServices returns all the services registered as part of a node
func (c *Catalog) NodeServices(args *structs.NodeSpecificRequest, reply *structs.IndexedNodeServices) error {
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if done, err := c.srv.forward("Catalog.NodeServices", args, args, reply); done {
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return err
}
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// Verify the arguments
if args.Node == "" {
return fmt.Errorf("Must provide node")
}
var filterType map[string]*structs.NodeService
filter, err := bexpr.CreateFilter(args.Filter, nil, filterType)
if err != nil {
return err
}
return c.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
index, services, err := state.NodeServices(ws, args.Node)
if err != nil {
return err
}
reply.Index, reply.NodeServices = index, services
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
if reply.NodeServices != nil {
raw, err := filter.Execute(reply.NodeServices.Services)
if err != nil {
return err
}
reply.NodeServices.Services = raw.(map[string]*structs.NodeService)
}
return nil
})
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}