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client-policies.go
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client-policies.go
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/*
* Copyright (c) 2022. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package share
import (
"context"
"fmt"
"github.com/pydio/cells/v4/common"
"github.com/pydio/cells/v4/common/client/grpc"
"github.com/pydio/cells/v4/common/proto/idm"
"github.com/pydio/cells/v4/common/utils/permissions"
"github.com/pydio/cells/v4/common/utils/uuid"
)
// InheritPolicies find possible SecurityPolicy currently implied and compute a new one based on it.
func (sc *Client) InheritPolicies(ctx context.Context, policyName string, read, write bool) (string, error) {
polClient := idm.NewPolicyEngineServiceClient(grpc.GetClientConnFromCtx(sc.RuntimeContext, common.ServicePolicy))
parent, err := sc.policyByName(ctx, polClient, policyName)
if err != nil {
return "", err
}
var suffix = ""
if read && write {
suffix = "rw"
} else if read {
suffix = "ro"
} else if write {
suffix = "wo"
} else {
return "", fmt.Errorf("provide at least one of read or write for extending policy")
}
// Create inherited flavours
if ro, er := sc.policyByName(ctx, polClient, policyName+"-"+suffix); er == nil && ro != nil {
// Already exist, just return
return ro.Uuid, nil
}
roPol, e := sc.derivePolicy(parent, read, write, suffix)
if e != nil {
return "", e
}
if _, e := polClient.StorePolicyGroup(ctx, &idm.StorePolicyGroupRequest{PolicyGroup: roPol}); e != nil {
return "", e
}
permissions.ClearCachedPolicies(ctx, "acl")
return roPol.Uuid, nil
}
func (sc *Client) derivePolicy(policy *idm.PolicyGroup, read, write bool, suffix string) (*idm.PolicyGroup, error) {
var label string
switch suffix {
case "ro":
label = "Read Only"
case "rw":
label = "Read Write"
case "wo":
label = "Write Only"
}
newG := &idm.PolicyGroup{
Uuid: policy.Uuid + "-" + suffix,
Name: policy.Name + " (" + label + ")",
Description: policy.Description + " (generated for sharing)",
ResourceGroup: policy.ResourceGroup,
OwnerUuid: policy.OwnerUuid,
}
var hasRead, hasWrite bool
var allowPol *idm.Policy
for _, p := range policy.Policies {
// Deny : append policy
if p.Effect == idm.PolicyEffect_deny {
p.Id = uuid.New()
p.Subjects = []string{"policy:" + newG.Uuid}
newG.Policies = append(newG.Policies, p)
continue
}
// Allow : check action effect
allowPol = p
for _, a := range p.Actions {
if a == permissions.AclRead.Name {
hasRead = true
} else if a == permissions.AclWrite.Name {
hasWrite = true
}
}
}
if allowPol == nil {
return nil, fmt.Errorf("cannot derive parent policy (no allow rule set)")
}
if read && !hasRead {
return nil, fmt.Errorf("cannot assign read as parent policy does not provide read access")
}
if write && !hasWrite {
return nil, fmt.Errorf("cannot assign write as parent policy does not provide write access")
}
// Reset actions
allowPol.Id = uuid.New()
allowPol.Subjects = []string{"policy:" + newG.Uuid}
allowPol.Actions = []string{}
if read {
allowPol.Actions = append(allowPol.Actions, permissions.AclRead.Name)
}
if write {
allowPol.Actions = append(allowPol.Actions, permissions.AclWrite.Name)
}
newG.Policies = append(newG.Policies, allowPol)
return newG, nil
}
func (sc *Client) policyByName(ctx context.Context, cl idm.PolicyEngineServiceClient, name string) (*idm.PolicyGroup, error) {
response, e := cl.ListPolicyGroups(ctx, &idm.ListPolicyGroupsRequest{Filter: "uuid:" + name})
if e != nil {
return nil, e
}
if len(response.PolicyGroups) == 0 {
return nil, fmt.Errorf("cannot find policy with uuid " + name)
}
return response.PolicyGroups[0], nil
}
// InterpretInheritedPolicy translates a SecurityPolicy to read/write permissions for user readability
func (sc *Client) InterpretInheritedPolicy(ctx context.Context, name string) (read, write bool, e error) {
polClient := idm.NewPolicyEngineServiceClient(grpc.GetClientConnFromCtx(sc.RuntimeContext, common.ServicePolicy))
parent, er := sc.policyByName(ctx, polClient, name)
if er != nil {
return false, false, er
}
for _, p := range parent.Policies {
// Deny : append policy
if p.Effect == idm.PolicyEffect_deny {
continue
}
// Allow : check action effect
for _, a := range p.Actions {
if a == permissions.AclRead.Name {
read = true
} else if a == permissions.AclWrite.Name {
write = true
}
}
}
return
}