138 lines
3.8 KiB
Go
138 lines
3.8 KiB
Go
package jwtauth
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/hashicorp/vault/sdk/helper/strutil"
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log "github.com/hashicorp/go-hclog"
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"github.com/mitchellh/pointerstructure"
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)
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// getClaim returns a claim value from allClaims given a provided claim string.
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// If this string is a valid JSONPointer, it will be interpreted as such to locate
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// the claim. Otherwise, the claim string will be used directly.
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func getClaim(logger log.Logger, allClaims map[string]interface{}, claim string) interface{} {
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var val interface{}
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var err error
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if !strings.HasPrefix(claim, "/") {
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val = allClaims[claim]
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} else {
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val, err = pointerstructure.Get(allClaims, claim)
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if err != nil {
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logger.Warn(fmt.Sprintf("unable to locate %s in claims: %s", claim, err.Error()))
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return nil
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}
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}
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// The claims unmarshalled by go-oidc don't use UseNumber, so there will
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// be mismatches if they're coming in as float64 since Vault's config will
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// be represented as json.Number. If the operator can coerce claims data to
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// be in string form, there is no problem. Alternatively, we could try to
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// intelligently convert float64 to json.Number, e.g.:
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//
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// switch v := val.(type) {
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// case float64:
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// val = json.Number(strconv.Itoa(int(v)))
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// }
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//
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// Or we fork and/or PR go-oidc.
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return val
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}
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// extractMetadata builds a metadata map from a set of claims and claims mappings.
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// The referenced claims must be strings and the claims mappings must be of the structure:
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//
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// {
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// "/some/claim/pointer": "metadata_key1",
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// "another_claim": "metadata_key2",
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// ...
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// }
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func extractMetadata(logger log.Logger, allClaims map[string]interface{}, claimMappings map[string]string) (map[string]string, error) {
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metadata := make(map[string]string)
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for source, target := range claimMappings {
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if value := getClaim(logger, allClaims, source); value != nil {
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strValue, ok := value.(string)
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if !ok {
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return nil, fmt.Errorf("error converting claim '%s' to string", source)
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}
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metadata[target] = strValue
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}
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}
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return metadata, nil
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}
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// validateAudience checks whether any of the audiences in audClaim match those
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// in boundAudiences. If strict is true and there are no bound audiences, then the
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// presence of any audience in the received claim is considered an error.
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func validateAudience(boundAudiences, audClaim []string, strict bool) error {
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if strict && len(boundAudiences) == 0 && len(audClaim) > 0 {
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return errors.New("audience claim found in JWT but no audiences bound to the role")
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}
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if len(boundAudiences) > 0 {
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for _, v := range boundAudiences {
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if strutil.StrListContains(audClaim, v) {
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return nil
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}
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}
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return errors.New("aud claim does not match any bound audience")
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}
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return nil
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}
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// validateBoundClaims checks that all of the claim:value requirements in boundClaims are
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// met in allClaims.
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func validateBoundClaims(logger log.Logger, boundClaims, allClaims map[string]interface{}) error {
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for claim, expValue := range boundClaims {
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actValue := getClaim(logger, allClaims, claim)
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if actValue == nil {
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return fmt.Errorf("claim %q is missing", claim)
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}
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var actVals, expVals []interface{}
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switch v := actValue.(type) {
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case []interface{}:
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actVals = v
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case string:
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actVals = []interface{}{v}
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default:
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return fmt.Errorf("received claim is not a string or list: %v", actValue)
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}
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switch v := expValue.(type) {
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case []interface{}:
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expVals = v
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case string:
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expVals = []interface{}{v}
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default:
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return fmt.Errorf("bound claim is not a string or list: %v", expValue)
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}
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found := false
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scan:
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for _, v := range expVals {
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for _, av := range actVals {
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if av == v {
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found = true
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break scan
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}
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}
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}
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if !found {
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return fmt.Errorf("claim %q does not match any associated bound claim values", claim)
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}
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}
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return nil
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}
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