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targets.go
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targets.go
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// SPDX-License-Identifier: Apache-2.0
package repository
import (
"context"
"errors"
"fmt"
"log/slog"
"github.com/gittuf/gittuf/internal/policy"
"github.com/gittuf/gittuf/internal/signerverifier/dsse"
"github.com/gittuf/gittuf/internal/tuf"
sslibdsse "github.com/secure-systems-lab/go-securesystemslib/dsse"
)
var ErrInvalidPolicyName = errors.New("invalid rule or policy file name, cannot be 'root'")
// InitializeTargets is the interface for the user to create the specified
// policy file.
func (r *Repository) InitializeTargets(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, signCommit bool) error {
if targetsRoleName == policy.RootRoleName {
return ErrInvalidPolicyName
}
keyID, err := signer.KeyID()
if err != nil {
return nil
}
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
if state.HasTargetsRole(targetsRoleName) {
return ErrCannotReinitialize
}
// TODO: verify is role can be signed using the presented key. This requires
// the user to pass in the delegating role as well as we do not want to
// assume which role is the delegating role (diamond delegations are legal).
// See: https://github.com/gittuf/gittuf/issues/246.
slog.Debug("Creating initial rule file...")
targetsMetadata := policy.InitializeTargetsMetadata()
env, err := dsse.CreateEnvelope(targetsMetadata)
if err != nil {
return nil
}
slog.Debug(fmt.Sprintf("Signing initial rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return nil
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
if state.DelegationEnvelopes == nil {
state.DelegationEnvelopes = map[string]*sslibdsse.Envelope{}
}
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Initialize policy '%s'", targetsRoleName)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}
// AddDelegation is the interface for the user to add a new rule to gittuf
// policy.
func (r *Repository) AddDelegation(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, ruleName string, authorizedKeys []*tuf.Key, rulePatterns []string, threshold int, signCommit bool) error {
if ruleName == policy.RootRoleName {
return ErrInvalidPolicyName
}
keyID, err := signer.KeyID()
if err != nil {
return nil
}
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
slog.Debug("Checking if rule with same name exists...")
if state.HasRuleName(ruleName) {
return policy.ErrDuplicatedRuleName
}
slog.Debug("Loading current rule file...")
if !state.HasTargetsRole(targetsRoleName) {
return policy.ErrMetadataNotFound
}
// TODO: verify is role can be signed using the presented key. This requires
// the user to pass in the delegating role as well as we do not want to
// assume which role is the delegating role (diamond delegations are legal).
// See: https://github.com/gittuf/gittuf/issues/246.
targetsMetadata, err := state.GetTargetsMetadata(targetsRoleName)
if err != nil {
return err
}
slog.Debug("Adding rule to rule file...")
targetsMetadata, err = policy.AddDelegation(targetsMetadata, ruleName, authorizedKeys, rulePatterns, threshold)
if err != nil {
return err
}
targetsMetadata.SetVersion(targetsMetadata.Version + 1)
env, err := dsse.CreateEnvelope(targetsMetadata)
if err != nil {
return nil
}
slog.Debug(fmt.Sprintf("Signing updated rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return nil
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Add rule '%s' to policy '%s'", ruleName, targetsRoleName)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}
// UpdateDelegation is the interface for the user to update a rule to gittuf
// policy.
func (r *Repository) UpdateDelegation(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, ruleName string, authorizedKeys []*tuf.Key, rulePatterns []string, threshold int, signCommit bool) error {
if ruleName == policy.RootRoleName {
return ErrInvalidPolicyName
}
keyID, err := signer.KeyID()
if err != nil {
return nil
}
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
slog.Debug("Loading current rule file...")
if !state.HasTargetsRole(targetsRoleName) {
return policy.ErrMetadataNotFound
}
// TODO: verify is role can be signed using the presented key. This requires
// the user to pass in the delegating role as well as we do not want to
// assume which role is the delegating role (diamond delegations are legal).
// See: https://github.com/gittuf/gittuf/issues/246.
targetsMetadata, err := state.GetTargetsMetadata(targetsRoleName)
if err != nil {
return err
}
slog.Debug("Updating rule in rule file...")
targetsMetadata, err = policy.UpdateDelegation(targetsMetadata, ruleName, authorizedKeys, rulePatterns, threshold)
if err != nil {
return err
}
targetsMetadata.SetVersion(targetsMetadata.Version + 1)
env, err := dsse.CreateEnvelope(targetsMetadata)
if err != nil {
return nil
}
slog.Debug(fmt.Sprintf("Signing updated rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return nil
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Update rule '%s' in policy '%s'", ruleName, targetsRoleName)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}
// RemoveDelegation is the interface for a user to remove a rule from gittuf
// policy.
func (r *Repository) RemoveDelegation(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, ruleName string, signCommit bool) error {
keyID, err := signer.KeyID()
if err != nil {
return nil
}
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
slog.Debug("Loading current rule file...")
if !state.HasTargetsRole(targetsRoleName) {
return policy.ErrMetadataNotFound
}
// TODO: verify is role can be signed using the presented key. This requires
// the user to pass in the delegating role as well as we do not want to
// assume which role is the delegating role (diamond delegations are legal).
// See: https://github.com/gittuf/gittuf/issues/246.
targetsMetadata, err := state.GetTargetsMetadata(targetsRoleName)
if err != nil {
return err
}
slog.Debug("Removing rule from rule file...")
targetsMetadata, err = policy.RemoveDelegation(targetsMetadata, ruleName)
if err != nil {
return err
}
targetsMetadata.SetVersion(targetsMetadata.Version + 1)
env, err := dsse.CreateEnvelope(targetsMetadata)
if err != nil {
return nil
}
slog.Debug(fmt.Sprintf("Signing updated rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return nil
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Remove rule '%s' from policy '%s'", ruleName, targetsRoleName)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}
// AddKeyToTargets is the interface for a user to add a trusted key to the
// gittuf policy.
func (r *Repository) AddKeyToTargets(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, authorizedKeys []*tuf.Key, signCommit bool) error {
keyID, err := signer.KeyID()
if err != nil {
return nil
}
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
if !state.HasTargetsRole(targetsRoleName) {
return policy.ErrMetadataNotFound
}
// TODO: verify is role can be signed using the presented key. This requires
// the user to pass in the delegating role as well as we do not want to
// assume which role is the delegating role (diamond delegations are legal).
// See: https://github.com/gittuf/gittuf/issues/246.
keyIDs := ""
for _, key := range authorizedKeys {
keyIDs += fmt.Sprintf("\n%s:%s", key.KeyType, key.KeyID)
}
slog.Debug("Loading current rule file...")
targetsMetadata, err := state.GetTargetsMetadata(targetsRoleName)
if err != nil {
return err
}
slog.Debug("Adding rule to rule file...")
targetsMetadata, err = policy.AddKeyToTargets(targetsMetadata, authorizedKeys)
if err != nil {
return err
}
targetsMetadata.SetVersion(targetsMetadata.Version + 1)
env, err := dsse.CreateEnvelope(targetsMetadata)
if err != nil {
return err
}
slog.Debug(fmt.Sprintf("Signing updated rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return err
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Add keys to policy '%s'\n%s", targetsRoleName, keyIDs)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}
// SignTargets adds a signature to specified Targets role's envelope. Note that
// the metadata itself is not modified, so its version remains the same.
func (r *Repository) SignTargets(ctx context.Context, signer sslibdsse.SignerVerifier, targetsRoleName string, signCommit bool) error {
slog.Debug("Loading current policy...")
state, err := policy.LoadCurrentState(ctx, r.r, policy.PolicyStagingRef)
if err != nil {
return err
}
if !state.HasTargetsRole(targetsRoleName) {
return policy.ErrMetadataNotFound
}
keyID, err := signer.KeyID()
if err != nil {
return err
}
var env *sslibdsse.Envelope
if targetsRoleName == policy.TargetsRoleName {
env = state.TargetsEnvelope
} else {
env = state.DelegationEnvelopes[targetsRoleName]
}
slog.Debug(fmt.Sprintf("Signing rule file using '%s'...", keyID))
env, err = dsse.SignEnvelope(ctx, env, signer)
if err != nil {
return err
}
if targetsRoleName == policy.TargetsRoleName {
state.TargetsEnvelope = env
} else {
state.DelegationEnvelopes[targetsRoleName] = env
}
commitMessage := fmt.Sprintf("Add signature from key '%s' to policy '%s'", keyID, targetsRoleName)
slog.Debug("Committing policy...")
return state.Commit(r.r, commitMessage, signCommit)
}