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Adds a auditd service that gathers all audit logs from kernel. Signed-off-by: Noel Georgi <git@frezbo.dev>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| // Package auditd registers auditd service and logs audit events. | ||
| package auditd | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/elastic/go-libaudit/v2" | ||
| "github.com/elastic/go-libaudit/v2/auparse" | ||
|
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| "github.com/siderolabs/talos/internal/app/machined/pkg/runtime" | ||
| ) | ||
|
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| // Main is an entrypoint to the auditd service. | ||
| func Main(ctx context.Context, _ runtime.Runtime, logWriter io.Writer) error { | ||
| return Run(ctx, logWriter) | ||
| } | ||
|
|
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| // Run starts the auditd service. | ||
| // | ||
| // based on https://github.com/elastic/go-libaudit/blob/main/cmd/audit/audit.go | ||
| // | ||
| //nolint:gocyclo | ||
| func Run(ctx context.Context, logWriter io.Writer) error { | ||
| var writer io.Writer | ||
|
|
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| client, err := libaudit.NewAuditClient(writer) | ||
| if err != nil { | ||
| return fmt.Errorf("[auditd]: failed to create audit client: %w", err) | ||
| } | ||
|
|
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| status, err := client.GetStatus() | ||
| if err != nil { | ||
| return fmt.Errorf("[auditd]: failed to get audit status: %w", err) | ||
| } | ||
|
|
||
| if status.Enabled == 0 { | ||
| if err := client.SetEnabled(true, libaudit.WaitForReply); err != nil { | ||
| return fmt.Errorf("[auditd]: failed to enable audit: %w", err) | ||
| } | ||
| } | ||
|
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| if err = client.SetRateLimit(uint32(4096), libaudit.NoWait); err != nil { | ||
| return fmt.Errorf("[auditd]: failed to set rate limit: %w", err) | ||
| } | ||
|
|
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| if err := client.SetBacklogLimit(8192, libaudit.NoWait); err != nil { | ||
| return fmt.Errorf("[auditd]: failed to set backlog limit: %w", err) | ||
| } | ||
|
|
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| if err := client.SetPID(libaudit.NoWait); err != nil { | ||
| return fmt.Errorf("[auditd]: failed to set audit PID: %w", err) | ||
| } | ||
|
|
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| go func(c *libaudit.AuditClient) { | ||
| <-ctx.Done() | ||
|
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| c.Close() //nolint:errcheck | ||
| }(client) | ||
|
|
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| for { | ||
| rawEvent, err := client.Receive(false) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
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| // Messages from 1300-2999 are valid audit messages. | ||
| if rawEvent.Type < auparse.AUDIT_USER_AUTH || | ||
| rawEvent.Type > auparse.AUDIT_LAST_USER_MSG2 { | ||
| continue | ||
| } | ||
|
|
||
| fmt.Fprintf(logWriter, "type=%s msg=%s\n", rawEvent.Type, rawEvent.Data) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
||
| package services | ||
|
|
||
| import ( | ||
| "context" | ||
|
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| "github.com/siderolabs/talos/internal/app/auditd" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/runtime" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/system" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/system/events" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/system/health" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/system/runner" | ||
| "github.com/siderolabs/talos/internal/app/machined/pkg/system/runner/goroutine" | ||
| "github.com/siderolabs/talos/pkg/conditions" | ||
| ) | ||
|
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| const auditdServiceID = "auditd" | ||
|
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| var _ system.HealthcheckedService = (*Auditd)(nil) | ||
|
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| // Auditd implements the Service interface. It serves as the concrete type with | ||
| // the required methods. | ||
| type Auditd struct{} | ||
|
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| // ID implements the Service interface. | ||
| func (s *Auditd) ID(r runtime.Runtime) string { | ||
| return auditdServiceID | ||
| } | ||
|
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| // PreFunc implements the Service interface. | ||
| func (s *Auditd) PreFunc(ctx context.Context, r runtime.Runtime) error { | ||
| return nil | ||
| } | ||
|
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| // PostFunc implements the Service interface. | ||
| func (s *Auditd) PostFunc(r runtime.Runtime, state events.ServiceState) error { | ||
| return nil | ||
| } | ||
|
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| // Condition implements the Service interface. | ||
| func (s *Auditd) Condition(r runtime.Runtime) conditions.Condition { | ||
| return nil | ||
| } | ||
|
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| // DependsOn implements the Service interface. | ||
| func (s *Auditd) DependsOn(r runtime.Runtime) []string { | ||
| return nil | ||
| } | ||
|
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| // Runner implements the Service interface. | ||
| func (s *Auditd) Runner(r runtime.Runtime) (runner.Runner, error) { | ||
| return goroutine.NewRunner(r, auditdServiceID, auditd.Main, runner.WithLoggingManager(r.Logging())), nil | ||
| } | ||
|
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| // HealthFunc implements the HealthcheckedService interface. | ||
| func (s *Auditd) HealthFunc(r runtime.Runtime) health.Check { | ||
| return func(ctx context.Context) error { | ||
| return nil | ||
| } | ||
| } | ||
|
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| // HealthSettings implements the HealthcheckedService interface. | ||
| func (s *Auditd) HealthSettings(r runtime.Runtime) *health.Settings { | ||
| return &health.DefaultSettings | ||
| } |
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