Documentation
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Index ¶
- type Client
- func (c *Client) ContainerLogs(ctx context.Context, containerName string, tail int) (string, error)
- func (c *Client) ContainerRunning(ctx context.Context, containerID string) (bool, error)
- func (c *Client) ContainerStats(ctx context.Context, containerName string) (*ContainerStatsResult, error)
- func (c *Client) CreateSandbox(ctx context.Context, cfg SandboxConfig) (string, error)
- func (c *Client) Exec(ctx context.Context, cfg ExecConfig) (*ExecResult, error)
- func (c *Client) ExecSimple(ctx context.Context, containerID string, cmd []string) (stdout, stderr string, err error)
- func (c *Client) ExecStream(ctx context.Context, cfg ExecConfig, stdout, stderr io.Writer) (*ExecResult, error)
- func (c *Client) ImageExists(ctx context.Context, image string) (bool, error)
- func (c *Client) Inner() *client.Client
- func (c *Client) ListImages(ctx context.Context) ([]ImageSummary, error)
- func (c *Client) PullImage(ctx context.Context, image string) error
- func (c *Client) ReadFile(ctx context.Context, containerID, path string) ([]byte, error)
- func (c *Client) SeccompJSON() string
- func (c *Client) StopSandbox(ctx context.Context, containerID string) error
- func (c *Client) VerifyImage(ctx context.Context, image string) (string, error)
- func (c *Client) WriteFile(ctx context.Context, containerID, path string, content []byte) error
- type ContainerStatsResult
- type ExecConfig
- type ExecResult
- type ImageSummary
- type SandboxConfig
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Client ¶
type Client struct {
// contains filtered or unexported fields
}
Client wraps the Docker SDK client with optional seccomp enforcement.
func New ¶
New creates a new Docker client using the environment / DOCKER_HOST.
Seccomp: DOCKER_SECCOMP_PROFILE controls which profile is applied:
- "" → use the embedded vaultrun seccomp profile (default, recommended)
- "default" → pass seccomp=default explicitly to rely on the daemon's built-in filter
- "/path" → load and embed the JSON from the given file path
Cosign: when COSIGN_PUBLIC_KEY points to a PEM public key, every image is verified with `cosign verify --key <file> <image>` before use. If the key is set but the cosign binary is missing, CreateSandbox fails closed.
func (*Client) ContainerLogs ¶
ContainerLogs returns the last tail lines of combined stdout+stderr for containerName. When tail <= 0 all available log lines are returned.
func (*Client) ContainerRunning ¶
ContainerRunning returns true if the container exists and is running.
func (*Client) ContainerStats ¶
func (c *Client) ContainerStats(ctx context.Context, containerName string) (*ContainerStatsResult, error)
ContainerStats returns a single-sample resource snapshot for containerName.
func (*Client) CreateSandbox ¶
CreateSandbox creates and starts an isolated Docker container.
Security steps (in order):
- Cosign image signature verification (if COSIGN_PUBLIC_KEY is set)
- Image pull if not cached
- Per-session Docker bridge network creation + iptables egress rules (only when NetworkEnabled && len(AllowedHosts) > 0)
- Container create + start with seccomp, CapDrop ALL, no-new-privileges
func (*Client) Exec ¶
func (c *Client) Exec(ctx context.Context, cfg ExecConfig) (*ExecResult, error)
Exec runs a command inside the sandbox container and buffers full output. It is deliberately NOT shell-invoked — command and args are passed as separate fields to the Docker exec API, preventing shell injection.
func (*Client) ExecSimple ¶ added in v0.3.0
func (c *Client) ExecSimple(ctx context.Context, containerID string, cmd []string) (stdout, stderr string, err error)
ExecSimple is a convenience wrapper for running simple commands that returns stdout, stderr and error
func (*Client) ExecStream ¶
func (c *Client) ExecStream(ctx context.Context, cfg ExecConfig, stdout, stderr io.Writer) (*ExecResult, error)
ExecStream runs a command and writes output chunks to stdout/stderr as they arrive. The ExecResult's Stdout and Stderr fields are empty — data is written directly to the provided writers.
func (*Client) ImageExists ¶
ImageExists returns true if the image is already locally available.
func (*Client) ListImages ¶
func (c *Client) ListImages(ctx context.Context) ([]ImageSummary, error)
ListImages returns locally available Docker images.
func (*Client) SeccompJSON ¶
SeccompJSON returns the raw seccomp profile JSON configured for this client. Used by the warm pool so it can apply the same profile as CreateSandbox.
func (*Client) StopSandbox ¶
StopSandbox stops and removes the container, then cleans up any associated per-session network and iptables egress rules.
func (*Client) VerifyImage ¶
VerifyImage checks the container image's cryptographic signature using cosign when a public key is configured via COSIGN_PUBLIC_KEY.
Behaviour:
- Key NOT set → no-op, returns (image, nil)
- Key set, cosign binary missing → returns error (fail-closed)
- Key set, signature absent/invalid → returns error (fail-closed)
- Key set, signature valid → returns digest-pinned image ref, e.g. "python@sha256:abc123…" — use this for all subsequent pull/run operations to close the TOCTOU window between verify and pull.
This must be called before PullImage / ImageExists so that unverified images are never instantiated as containers.
type ContainerStatsResult ¶
type ContainerStatsResult struct {
CPUPercent float64 `json:"cpu_percent"`
MemoryBytes uint64 `json:"memory_bytes"`
MemoryLimitBytes uint64 `json:"memory_limit_bytes"`
NetworkRxBytes uint64 `json:"network_rx_bytes"`
NetworkTxBytes uint64 `json:"network_tx_bytes"`
}
ContainerStatsResult holds the one-shot resource metrics for a container.
type ExecConfig ¶
type ExecConfig struct {
ContainerID string
Command string
Args []string
Env map[string]string
WorkingDir string
TimeoutSeconds int
MaxOutputBytes int64
}
ExecConfig holds parameters for running a command inside a container.
type ExecResult ¶
type ExecResult struct {
ExitCode int
Stdout string // populated by Exec; empty when using ExecStream
Stderr string // populated by Exec; empty when using ExecStream
DurationMS int64
TimedOut bool
Truncated bool // true when stdout or stderr was capped at MaxOutputBytes (M-10)
}
ExecResult is the result of an exec invocation.
type ImageSummary ¶
type ImageSummary struct {
ID string `json:"id"`
Tags []string `json:"tags"`
SizeBytes int64 `json:"size_bytes"`
CreatedAt time.Time `json:"created_at"`
}
ImageSummary is a trimmed image descriptor returned by ListImages.
type SandboxConfig ¶
type SandboxConfig struct {
SessionID uuid.UUID
Image string
WorkspacePath string
NetworkEnabled bool
CPULimit float64 // fractional CPUs, e.g. 0.5 = half a core
MemoryLimitMB int
ContainerName string
// AllowedHosts is an optional list of hostnames or IPs the container may
// reach when NetworkEnabled is true.
//
// When non-empty, a dedicated per-session Docker bridge network is created
// and host-side iptables rules enforce that only DNS and the resolved IPs
// of the listed hosts are reachable. AllowedHosts entries are also injected
// into /etc/hosts via ExtraHosts for in-container DNS resolution.
//
// When empty (and NetworkEnabled), the container uses the default bridge
// without iptables filtering (operator is responsible for egress policy).
AllowedHosts []string
// GPUDevices enables NVIDIA GPU access inside the container.
// Values: "all" (all GPUs), "0" (first GPU), "0,1" (first two GPUs), "" (disabled).
// Requires nvidia-container-toolkit on the host.
GPUDevices string
}
SandboxConfig holds the parameters for creating a session container.
Source Files