281 lines
6.9 KiB
Go
281 lines
6.9 KiB
Go
package extended
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/json"
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/flynn-archive/go-shlex"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
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"github.com/nspcc-dev/neofs-sdk-go/eacl"
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"github.com/spf13/cobra"
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)
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var createCmd = &cobra.Command{
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Use: "create",
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Short: "Create extended ACL from the text representation",
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Long: `Create extended ACL from the text representation.
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Rule consist of these blocks: <action> <operation> [<filter1> ...] [<target1> ...]
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Action is 'allow' or 'deny'.
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Operation is an object service verb: 'get', 'head', 'put', 'search', 'delete', 'getrange', or 'getrangehash'.
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Filter consists of <typ>:<key><match><value>
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Typ is 'obj' for object applied filter or 'req' for request applied filter.
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Key is a valid unicode string corresponding to object or request header key.
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Well-known system object headers start with '$Object:' prefix.
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User defined headers start without prefix.
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Read more about filter keys at github.com/nspcc-dev/neofs-api/blob/master/proto-docs/acl.md#message-eaclrecordfilter
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Match is '=' for matching and '!=' for non-matching filter.
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Value is a valid unicode string corresponding to object or request header value.
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Target is
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'user' for container owner,
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'system' for Storage nodes in container and Inner Ring nodes,
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'others' for all other request senders,
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'pubkey:<key1>,<key2>,...' for exact request sender, where <key> is a hex-encoded 33-byte public key.
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When both '--rule' and '--file' arguments are used, '--rule' records will be placed higher in resulting extended ACL table.
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`,
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Example: `neofs-cli acl extended create --cid EutHBsdT1YCzHxjCfQHnLPL1vFrkSyLSio4vkphfnEk -f rules.txt --out table.json
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neofs-cli acl extended create --cid EutHBsdT1YCzHxjCfQHnLPL1vFrkSyLSio4vkphfnEk -r 'allow get obj:Key=Value others' -r 'deny put others'`,
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Run: createEACL,
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}
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func init() {
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createCmd.Flags().StringArrayP("rule", "r", nil, "extended ACL table record to apply")
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createCmd.Flags().StringP("file", "f", "", "read list of extended ACL table records from from text file")
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createCmd.Flags().StringP("out", "o", "", "save JSON formatted extended ACL table in file")
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createCmd.Flags().StringP("cid", "", "", "container ID")
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_ = cobra.MarkFlagFilename(createCmd.Flags(), "file")
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_ = cobra.MarkFlagFilename(createCmd.Flags(), "out")
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}
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func createEACL(cmd *cobra.Command, _ []string) {
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rules, _ := cmd.Flags().GetStringArray("rule")
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fileArg, _ := cmd.Flags().GetString("file")
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outArg, _ := cmd.Flags().GetString("out")
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cidArg, _ := cmd.Flags().GetString("cid")
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var containerID cid.ID
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if cidArg != "" {
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if err := containerID.DecodeString(cidArg); err != nil {
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cmd.PrintErrf("invalid container ID: %v\n", err)
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os.Exit(1)
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}
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}
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rulesFile, err := getRulesFromFile(fileArg)
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if err != nil {
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cmd.PrintErrf("can't read rules from file: %v\n", err)
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os.Exit(1)
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}
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rules = append(rules, rulesFile...)
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if len(rules) == 0 {
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cmd.PrintErrln("no extended ACL rules has been provided")
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os.Exit(1)
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}
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tb := eacl.NewTable()
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for _, ruleStr := range rules {
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r, err := shlex.Split(ruleStr)
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if err != nil {
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cmd.PrintErrf("can't parse rule '%s': %v\n", ruleStr, err)
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os.Exit(1)
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}
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err = parseTable(tb, r)
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if err != nil {
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cmd.PrintErrf("can't create extended ACL record from rule '%s': %v\n", ruleStr, err)
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os.Exit(1)
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}
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}
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tb.SetCID(containerID)
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data, err := tb.MarshalJSON()
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if err != nil {
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cmd.PrintErrln(err)
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os.Exit(1)
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}
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buf := new(bytes.Buffer)
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err = json.Indent(buf, data, "", " ")
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if err != nil {
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cmd.PrintErrln(err)
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os.Exit(1)
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}
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if len(outArg) == 0 {
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cmd.Println(buf)
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return
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}
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err = os.WriteFile(outArg, buf.Bytes(), 0644)
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if err != nil {
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cmd.PrintErrln(err)
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os.Exit(1)
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}
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}
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func getRulesFromFile(filename string) ([]string, error) {
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if len(filename) == 0 {
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return nil, nil
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}
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data, err := os.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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return strings.Split(strings.TrimSpace(string(data)), "\n"), nil
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}
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// parseTable parses eACL table from the following form:
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// <action> <operation> [<filter1> ...] [<target1> ...]
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//
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// Examples:
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// allow get req:X-Header=123 obj:Attr=value others:0xkey1,key2 system:key3 user:key4
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func parseTable(tb *eacl.Table, args []string) error {
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if len(args) < 2 {
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return errors.New("at least 2 arguments must be provided")
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}
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var action eacl.Action
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if !action.FromString(strings.ToUpper(args[0])) {
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return errors.New("invalid action (expected 'allow' or 'deny')")
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}
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ops, err := parseOperations(args[1])
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if err != nil {
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return err
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}
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r, err := parseRecord(args[2:])
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if err != nil {
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return err
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}
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r.SetAction(action)
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for _, op := range ops {
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r := *r
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r.SetOperation(op)
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tb.AddRecord(&r)
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}
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return nil
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}
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func parseRecord(args []string) (*eacl.Record, error) {
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r := new(eacl.Record)
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for i := range args {
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ss := strings.SplitN(args[i], ":", 2)
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switch prefix := strings.ToLower(ss[0]); prefix {
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case "req", "obj": // filters
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if len(ss) != 2 {
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return nil, fmt.Errorf("invalid filter or target: %s", args[i])
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}
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i := strings.Index(ss[1], "=")
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if i < 0 {
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return nil, fmt.Errorf("invalid filter key-value pair: %s", ss[1])
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}
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var key, value string
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var op eacl.Match
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if 0 < i && ss[1][i-1] == '!' {
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key = ss[1][:i-1]
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op = eacl.MatchStringNotEqual
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} else {
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key = ss[1][:i]
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op = eacl.MatchStringEqual
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}
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value = ss[1][i+1:]
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typ := eacl.HeaderFromRequest
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if ss[0] == "obj" {
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typ = eacl.HeaderFromObject
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}
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r.AddFilter(typ, op, key, value)
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case "others", "system", "user", "pubkey": // targets
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var err error
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var pubs []ecdsa.PublicKey
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if len(ss) == 2 {
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pubs, err = parseKeyList(ss[1])
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if err != nil {
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return nil, err
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}
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}
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var role eacl.Role
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if prefix != "pubkey" {
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role, err = roleFromString(prefix)
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if err != nil {
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return nil, err
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}
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}
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eacl.AddFormedTarget(r, role, pubs...)
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default:
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return nil, fmt.Errorf("invalid prefix: %s", ss[0])
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}
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}
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return r, nil
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}
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func roleFromString(s string) (eacl.Role, error) {
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var r eacl.Role
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if !r.FromString(strings.ToUpper(s)) {
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return r, fmt.Errorf("unexpected role %s", s)
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}
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return r, nil
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}
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// parseKeyList parses list of hex-encoded public keys separated by comma.
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func parseKeyList(s string) ([]ecdsa.PublicKey, error) {
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ss := strings.Split(s, ",")
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pubs := make([]ecdsa.PublicKey, len(ss))
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for i := range ss {
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st := strings.TrimPrefix(ss[i], "0x")
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pub, err := keys.NewPublicKeyFromString(st)
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if err != nil {
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return nil, fmt.Errorf("invalid public key '%s': %w", ss[i], err)
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}
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pubs[i] = ecdsa.PublicKey(*pub)
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}
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return pubs, nil
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}
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func parseOperations(s string) ([]eacl.Operation, error) {
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ss := strings.Split(s, ",")
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ops := make([]eacl.Operation, len(ss))
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for i := range ss {
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if !ops[i].FromString(strings.ToUpper(ss[i])) {
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return nil, fmt.Errorf("invalid operation: %s", ss[i])
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}
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}
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return ops, nil
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}
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