| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "path/filepath" |
| 6 | "strings" |
| 7 | |
| 8 | "github.com/carlosframework/platform/internal/cgroup" |
| 9 | "github.com/carlosframework/platform/internal/hostbox" |
| 10 | "github.com/carlosframework/platform/internal/hostguard" |
| 11 | "github.com/carlosframework/platform/internal/instancectl" |
| 12 | ) |
| 13 | |
| 14 | func claimContainmentParent(agent string, t hostguard.FenceTarget) (string, error) { |
| 15 | rel, err := filepath.Rel("/sys/fs/cgroup", agent) |
| 16 | if err != nil || !filepath.IsLocal(rel) || rel == "." || filepath.Clean(agent) != agent || !stopComponent(t.Host) || t.Incarnation == "" || t.Stamp == 0 || t.Session == 0 || t.Box == "" || t.Enrollment == "" || t.BootID == "" || t.ControllerID == "" { |
| 17 | return "", ErrClaimStopInventory |
| 18 | } |
| 19 | return filepath.Join(rel, cgroup.ExecName(claimContainmentName(t))), nil |
| 20 | } |
| 21 | |
| 22 | func claimRoleChild(parent, p string) bool { |
| 23 | return filepath.IsLocal(p) && filepath.Clean(p) == p && filepath.Dir(p) == parent && strings.HasPrefix(filepath.Base(p), "role-") && len(filepath.Base(p)) > len("role-") |
| 24 | } |
| 25 | |
| 26 | func validateClaimGroups(parent string, groups []hostbox.LaunchGroup) error { |
| 27 | if len(groups) == 0 { |
| 28 | return ErrClaimStopInventory |
| 29 | } |
| 30 | found := false |
| 31 | seen := map[string]bool{} |
| 32 | for _, g := range groups { |
| 33 | if g.Device == 0 || g.Inode == 0 || seen[g.RelativePath] { |
| 34 | return ErrClaimStopInventory |
| 35 | } |
| 36 | seen[g.RelativePath] = true |
| 37 | if g.RelativePath == parent { |
| 38 | if g.InvocationID != "" { |
| 39 | return ErrClaimStopInventory |
| 40 | } |
| 41 | found = true |
| 42 | } else if !claimRoleChild(parent, g.RelativePath) || g.InvocationID == "" { |
| 43 | return ErrClaimStopInventory |
| 44 | } |
| 45 | } |
| 46 | if !found { |
| 47 | return ErrClaimStopInventory |
| 48 | } |
| 49 | return nil |
| 50 | } |
| 51 | |
| 52 | func validateClaimContainment(in hostbox.LaunchInventory, parent string) error { |
| 53 | return validateClaimContainmentUnit(in, parent, instancectl.ClaimUnitControlGroup(in.Target.Host)) |
| 54 | } |
| 55 | |
| 56 | func validateClaimContainmentUnit(in hostbox.LaunchInventory, parent, unitGroup string) error { |
| 57 | if err := validateClaimGroups(parent, in.Groups); err != nil { |
| 58 | return err |
| 59 | } |
| 60 | var parentGroup hostbox.LaunchGroup |
| 61 | groups := map[string]hostbox.LaunchGroup{} |
| 62 | for _, g := range in.Groups { |
| 63 | groups[g.RelativePath] = g |
| 64 | if g.RelativePath == parent { |
| 65 | parentGroup = g |
| 66 | } |
| 67 | } |
| 68 | claimed := map[string]bool{} |
| 69 | for _, r := range in.Reservations { |
| 70 | if !hostbox.SameLaunchOwner(in.Target, r.Target) { |
| 71 | return ErrClaimStopInventory |
| 72 | } |
| 73 | if hostbox.IsUnitReservation(r) { |
| 74 | if r.Parent != (hostbox.LaunchGroup{}) || r.Group.RelativePath != unitGroup { |
| 75 | return ErrClaimStopInventory |
| 76 | } |
| 77 | continue |
| 78 | } |
| 79 | if r.Parent != parentGroup || !claimRoleChild(parent, r.Group.RelativePath) || r.Group.InvocationID != r.InvocationID || r.InvocationID == "" || claimed[r.Group.RelativePath] { |
| 80 | return ErrClaimStopInventory |
| 81 | } |
| 82 | claimed[r.Group.RelativePath] = true |
| 83 | switch r.State { |
| 84 | case "intended": |
| 85 | if r.Group.Device != 0 || r.Group.Inode != 0 { |
| 86 | return ErrClaimStopInventory |
| 87 | } |
| 88 | case "reserved", "started", "settled": |
| 89 | // An intention settled after an absent child retains its zero identity. |
| 90 | if r.State == "settled" && r.Group.Device == 0 && r.Group.Inode == 0 { |
| 91 | continue |
| 92 | } |
| 93 | if groups[r.Group.RelativePath] != r.Group { |
| 94 | return ErrClaimStopInventory |
| 95 | } |
| 96 | default: |
| 97 | return ErrClaimStopInventory |
| 98 | } |
| 99 | } |
| 100 | for _, g := range in.Groups { |
| 101 | if g.RelativePath != parent && !claimed[g.RelativePath] { |
| 102 | return ErrClaimStopInventory |
| 103 | } |
| 104 | } |
| 105 | return nil |
| 106 | } |
| 107 | |
| 108 | func validateClaimJournalContainment(ctx context.Context, q hostbox.JournalRequest, j *hostbox.LaunchJournal) error { |
| 109 | switch q.Op { |
| 110 | case "create", "prelaunch", "intend", "reserve": |
| 111 | default: |
| 112 | return nil |
| 113 | } |
| 114 | target := q.Launch.Target |
| 115 | if q.Op == "intend" || q.Op == "reserve" { |
| 116 | target = q.Reservation.Target |
| 117 | } |
| 118 | agent, err := claimContainmentAgentRoot(ctx) |
| 119 | if err != nil { |
| 120 | return err |
| 121 | } |
| 122 | parent, err := claimContainmentParent(agent, target) |
| 123 | if err != nil { |
| 124 | return err |
| 125 | } |
| 126 | if q.Op == "create" || q.Op == "prelaunch" { |
| 127 | if len(q.Launch.Groups) != 1 || len(q.Launch.Reservations) != 0 { |
| 128 | return ErrClaimStopInventory |
| 129 | } |
| 130 | if err := validateClaimContainment(q.Launch, parent); err != nil { |
| 131 | return err |
| 132 | } |
| 133 | captured, err := claimContainmentInspect(parent) |
| 134 | if err != nil { |
| 135 | return err |
| 136 | } |
| 137 | if captured != q.Launch.Groups[0] { |
| 138 | return ErrClaimStopIdentity |
| 139 | } |
| 140 | return nil |
| 141 | } |
| 142 | in, err := j.Read(ctx, target) |
| 143 | if err != nil { |
| 144 | return err |
| 145 | } |
| 146 | if err := validateClaimContainment(in, parent); err != nil { |
| 147 | return err |
| 148 | } |
| 149 | r := q.Reservation |
| 150 | var expected hostbox.LaunchGroup |
| 151 | for _, g := range in.Groups { |
| 152 | if g.RelativePath == parent { |
| 153 | expected = g |
| 154 | } |
| 155 | } |
| 156 | if r.Parent != expected || !claimRoleChild(parent, r.Group.RelativePath) || r.Group.InvocationID != r.InvocationID || r.InvocationID == "" { |
| 157 | return ErrClaimStopInventory |
| 158 | } |
| 159 | captured, err := claimContainmentInspect(parent) |
| 160 | if err != nil { |
| 161 | return err |
| 162 | } |
| 163 | if captured != expected { |
| 164 | return ErrClaimStopIdentity |
| 165 | } |
| 166 | if q.Op == "reserve" { |
| 167 | captured, err = claimContainmentInspect(r.Group.RelativePath) |
| 168 | if err != nil { |
| 169 | return err |
| 170 | } |
| 171 | captured.InvocationID = r.InvocationID |
| 172 | if captured != r.Group { |
| 173 | return ErrClaimStopIdentity |
| 174 | } |
| 175 | } |
| 176 | return nil |
| 177 | } |
| 178 | |
| 179 | func validatePersistedClaimContainment(ctx context.Context, in hostbox.LaunchInventory) error { |
| 180 | agent, err := claimContainmentAgentRoot(ctx) |
| 181 | if err != nil { |
| 182 | return err |
| 183 | } |
| 184 | parent, err := claimContainmentParent(agent, in.Target) |
| 185 | if err != nil { |
| 186 | return err |
| 187 | } |
| 188 | return validateClaimContainment(in, parent) |
| 189 | } |
| 190 | |
| 191 | func validateStopClaimGroups(t hostguard.FenceTarget, j hostbox.StopKernelJournal, agent string) error { |
| 192 | if !hostbox.SameLaunchOwner(j.Target, t) { |
| 193 | return ErrClaimStopInventory |
| 194 | } |
| 195 | parent, err := claimContainmentParent(agent, t) |
| 196 | if err != nil { |
| 197 | return err |
| 198 | } |
| 199 | groups := make([]hostbox.LaunchGroup, 0, len(j.Cgroups)) |
| 200 | for _, g := range j.Cgroups { |
| 201 | groups = append(groups, hostbox.LaunchGroup{RelativePath: g.RelativePath, Device: g.Device, Inode: g.Inode, InvocationID: g.InvocationID}) |
| 202 | } |
| 203 | return validateClaimGroups(parent, groups) |
| 204 | } |
| 205 | |
| 206 | func validatePersistedUnitContainment(ctx context.Context, in hostbox.LaunchInventory, units ClaimLaunchUnits) error { |
| 207 | agent, err := claimContainmentAgentRoot(ctx) |
| 208 | if err != nil { |
| 209 | return err |
| 210 | } |
| 211 | parent, err := claimContainmentParent(agent, in.Target) |
| 212 | if err != nil { |
| 213 | return err |
| 214 | } |
| 215 | _, group, err := claimLaunchPlacement(units, in.Target.Host) |
| 216 | if err != nil { |
| 217 | return err |
| 218 | } |
| 219 | return validateClaimContainmentUnit(in, parent, group) |
| 220 | } |
| 221 | |
amadan