| 1 | //go:build linux |
| 2 | |
| 3 | package operator |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "os" |
| 8 | "time" |
| 9 | |
| 10 | "amadan.net/carlos/platform.git/launchctx" |
| 11 | "amadan.net/carlos/platform.git/launchctx/controlname" |
| 12 | "amadan.net/oficina/home/internal/operatorlaunch" |
| 13 | ) |
| 14 | |
| 15 | const commandConfigEnvironment = "HOME_OPERATOR_COMMAND" |
| 16 | |
| 17 | type commandConfig struct { |
| 18 | Version int `json:"version"` |
| 19 | Account string `json:"account"` |
| 20 | App string `json:"app"` |
| 21 | Host string `json:"host"` |
| 22 | Role string `json:"role"` |
| 23 | Origin string `json:"origin"` |
| 24 | Installation string `json:"installation"` |
| 25 | Registry string `json:"registry"` |
| 26 | Device string `json:"device"` |
| 27 | PublicKey string `json:"public_key"` |
| 28 | KeyID string `json:"key_id"` |
| 29 | Actions []string `json:"actions"` |
| 30 | } |
| 31 | |
| 32 | func parseCommandConfig(raw string) (commandConfig, *Verifier, error) { |
| 33 | var c commandConfig |
| 34 | if len(raw) == 0 || len(raw) > 8192 || strict([]byte(raw), &c) != nil || c.Version != 1 || !controlname.ValidAccount(c.Account) || !controlname.ValidApp(c.App) || !controlname.ValidHostShape(c.Host) { |
| 35 | return commandConfig{}, nil, ErrRefused |
| 36 | } |
| 37 | v, err := NewVerifier(Pins{c.Role, c.Origin, c.Installation, c.Registry, c.Device, c.PublicKey, c.Actions}) |
| 38 | if err != nil || c.KeyID != v.kid { |
| 39 | return commandConfig{}, nil, ErrRefused |
| 40 | } |
| 41 | return c, v, nil |
| 42 | } |
| 43 | |
| 44 | // commandInvocation remains private to the unmounted command adapter. Nothing |
| 45 | // in the HTTP app can supply a database, verifier or transport context to it. |
| 46 | type commandInvocation struct { |
| 47 | database *boundDatabase |
| 48 | verifier *Verifier |
| 49 | request Request |
| 50 | launch launchctx.LaunchContext |
| 51 | raw []byte |
| 52 | ctx context.Context |
| 53 | cancel context.CancelFunc |
| 54 | inspect bool |
| 55 | } |
| 56 | |
| 57 | func openCommandInvocation(parent context.Context, database string) (*commandInvocation, error) { |
| 58 | c, verifier, err := parseCommandConfig(os.Getenv(commandConfigEnvironment)) |
| 59 | if err != nil { |
| 60 | return nil, ErrRefused |
| 61 | } |
| 62 | return openConfiguredInvocation(parent, database, c, verifier) |
| 63 | } |
| 64 | |
| 65 | func openConfiguredInvocation(parent context.Context, database string, c commandConfig, verifier *Verifier) (*commandInvocation, error) { |
| 66 | launch, raw, err := operatorlaunch.ReadOperator(parent, database) |
| 67 | if err != nil { |
| 68 | return nil, ErrRefused |
| 69 | } |
| 70 | keep := false |
| 71 | defer func() { |
| 72 | if !keep { |
| 73 | clear(raw) |
| 74 | } |
| 75 | }() |
| 76 | if launch.Account != c.Account || launch.App != c.App || launch.Host != c.Host { |
| 77 | return nil, ErrRefused |
| 78 | } |
| 79 | request, err := verifier.Verify(raw) |
| 80 | inspect := false |
| 81 | if err != nil { |
| 82 | if !verifier.actions["directory.inspect"] { |
| 83 | return nil, ErrRefused |
| 84 | } |
| 85 | if _, err := verifier.verifyInspect(raw, time.Now()); err != nil { |
| 86 | return nil, ErrRefused |
| 87 | } |
| 88 | inspect = true |
| 89 | } |
| 90 | defer func() { |
| 91 | if !keep { |
| 92 | clear(request.input) |
| 93 | } |
| 94 | }() |
| 95 | deadline, err := time.Parse(time.RFC3339Nano, launch.ExecutionDeadline) |
| 96 | if err != nil || parent.Err() != nil { |
| 97 | return nil, ErrRefused |
| 98 | } |
| 99 | if callerDeadline, ok := parent.Deadline(); ok && callerDeadline.Before(deadline) { |
| 100 | deadline = callerDeadline |
| 101 | } |
| 102 | ctx, cancel := context.WithDeadline(parent, deadline) |
| 103 | db, err := newBoundDatabase(launch.DatabasePath, launch.DatabaseDevice, launch.DatabaseInode, deadline) |
| 104 | if err != nil { |
| 105 | cancel() |
| 106 | if err == ErrUnavailable { |
| 107 | return nil, ErrUnavailable |
| 108 | } |
| 109 | return nil, ErrRefused |
| 110 | } |
| 111 | keep = true |
| 112 | return &commandInvocation{db, verifier, request, launch, raw, ctx, cancel, inspect}, nil |
| 113 | } |
| 114 | |
| 115 | func (i *commandInvocation) close() error { |
| 116 | if i == nil || i.database == nil { |
| 117 | return ErrRefused |
| 118 | } |
| 119 | defer i.cancel() |
| 120 | defer clear(i.raw) |
| 121 | defer clear(i.request.input) |
| 122 | i.database.connector.mu.Lock() |
| 123 | identityErr := i.database.connector.pathMatches() |
| 124 | i.database.connector.mu.Unlock() |
| 125 | closeErr := i.database.close() |
| 126 | i.database = nil |
| 127 | if identityErr != nil || closeErr != nil || i.ctx.Err() != nil { |
| 128 | return ErrUnavailable |
| 129 | } |
| 130 | return nil |
| 131 | } |
| 132 | |
amadan