| 1 | package runtimepolicy |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "strings" |
| 6 | |
| 7 | "reasonix/internal/evidence" |
| 8 | "reasonix/internal/tool" |
| 9 | ) |
| 10 | |
| 11 | // PlanGuard hard-blocks writes while Plan mode is active, including YOLO. |
| 12 | type PlanGuard struct{} |
| 13 | |
| 14 | func (PlanGuard) BeforeTool(ctx CallContext) GuardDecision { |
| 15 | if !ctx.PlanReadOnly || !ctx.Profile.MutatesState() { |
| 16 | return GuardDecision{Action: GuardAbstain} |
| 17 | } |
| 18 | return GuardDecision{ |
| 19 | Action: GuardDeny, |
| 20 | Reasons: []string{"plan_boundary"}, |
| 21 | Message: "blocked: plan mode forbids workspace mutations until the plan is approved", |
| 22 | } |
| 23 | } |
| 24 | func (PlanGuard) AfterTool(ResultContext) []evidence.Receipt { return nil } |
| 25 | |
| 26 | // ConstraintGuard applies explicit user/host limits only. |
| 27 | type ConstraintGuard struct{ Constraints Constraints } |
| 28 | |
| 29 | func (g ConstraintGuard) BeforeTool(ctx CallContext) GuardDecision { |
| 30 | c := g.Constraints |
| 31 | if ctx.Profile.MutatesState() && !c.AllowsMutation() { |
| 32 | return GuardDecision{ |
| 33 | Action: GuardDeny, |
| 34 | Reasons: []string{"user_constraint"}, |
| 35 | Message: "blocked: the current constraints forbid state mutation", |
| 36 | } |
| 37 | } |
| 38 | if (ctx.Profile.ExternalState || looksExternalCommand(ctx)) && !c.AllowsExternal() { |
| 39 | return GuardDecision{ |
| 40 | Action: GuardDeny, |
| 41 | Reasons: []string{"user_constraint"}, |
| 42 | Message: "blocked: the current constraints forbid push/publish/deploy-style actions", |
| 43 | } |
| 44 | } |
| 45 | if ctx.Verification && !c.AllowsTests() { |
| 46 | return GuardDecision{ |
| 47 | Action: GuardDeny, |
| 48 | Reasons: []string{"user_constraint"}, |
| 49 | Message: "blocked: the current constraints forbid verification commands", |
| 50 | } |
| 51 | } |
| 52 | if ctx.Verification && !c.AllowsCommand(bashCommand(ctx)) { |
| 53 | return GuardDecision{ |
| 54 | Action: GuardDeny, |
| 55 | Reasons: []string{"user_constraint"}, |
| 56 | Message: "blocked: verification command is outside the user allowlist", |
| 57 | } |
| 58 | } |
| 59 | return GuardDecision{Action: GuardAbstain} |
| 60 | } |
| 61 | func (ConstraintGuard) AfterTool(ResultContext) []evidence.Receipt { return nil } |
| 62 | |
| 63 | func bashCommand(ctx CallContext) string { |
| 64 | name := strings.ToLower(strings.TrimSpace(ctx.ToolName)) |
| 65 | if !tool.IsShellToolName(name) { |
| 66 | return "" |
| 67 | } |
| 68 | var payload struct { |
| 69 | Command string `json:"command"` |
| 70 | } |
| 71 | if json.Unmarshal(ctx.Args, &payload) == nil { |
| 72 | return strings.TrimSpace(payload.Command) |
| 73 | } |
| 74 | return "" |
| 75 | } |
| 76 | |
| 77 | func looksExternalCommand(ctx CallContext) bool { |
| 78 | name := strings.ToLower(strings.TrimSpace(ctx.ToolName)) |
| 79 | if strings.Contains(name, "deploy") || strings.Contains(name, "publish") || strings.Contains(name, "push") { |
| 80 | return true |
| 81 | } |
| 82 | cmd := strings.ToLower(bashCommand(ctx)) |
| 83 | if cmd == "" { |
| 84 | return false |
| 85 | } |
| 86 | for _, needle := range []string{"git push", "publish", "kubectl", "deploy", "helm push"} { |
| 87 | if strings.Contains(cmd, needle) { |
| 88 | return true |
| 89 | } |
| 90 | } |
| 91 | return false |
| 92 | } |
| 93 | |
| 94 | // MutationDependencyGuard blocks later mutations after an earlier batch failure. |
| 95 | type MutationDependencyGuard struct{ Blocked bool } |
| 96 | |
| 97 | func (g MutationDependencyGuard) BeforeTool(ctx CallContext) GuardDecision { |
| 98 | if !g.Blocked || (!ctx.Profile.MutatesState() && !ctx.Verification) { |
| 99 | return GuardDecision{Action: GuardAbstain} |
| 100 | } |
| 101 | return GuardDecision{ |
| 102 | Action: GuardDeny, |
| 103 | Reasons: []string{"receipt"}, |
| 104 | Message: "blocked: an earlier mutation in this batch failed; later mutations and verifications cannot run", |
| 105 | } |
| 106 | } |
| 107 | func (MutationDependencyGuard) AfterTool(ResultContext) []evidence.Receipt { return nil } |
| 108 | |
| 109 | // OpaqueWriterGuard asks when an unknown writer can be reviewed, else denies. |
| 110 | type OpaqueWriterGuard struct{} |
| 111 | |
| 112 | func (OpaqueWriterGuard) BeforeTool(ctx CallContext) GuardDecision { |
| 113 | name := strings.ToLower(strings.TrimSpace(ctx.ToolName)) |
| 114 | if !ctx.Profile.OpaqueWriter() || tool.IsShellToolName(name) { |
| 115 | return GuardDecision{Action: GuardAbstain} |
| 116 | } |
| 117 | if ctx.Interactive { |
| 118 | return GuardDecision{ |
| 119 | Action: GuardAsk, |
| 120 | Reasons: []string{"opaque_writer"}, |
| 121 | Message: "unknown writer requires explicit approval", |
| 122 | } |
| 123 | } |
| 124 | return GuardDecision{ |
| 125 | Action: GuardDeny, |
| 126 | Reasons: []string{"opaque_writer"}, |
| 127 | Message: "blocked: unknown writer cannot run without an interactive approval channel", |
| 128 | } |
| 129 | } |
| 130 | func (OpaqueWriterGuard) AfterTool(ResultContext) []evidence.Receipt { return nil } |
| 131 |