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policies.go
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/
policies.go
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package auth
import (
"context"
"fmt"
"strings"
"github.com/golang/protobuf/ptypes"
"github.com/golang/protobuf/ptypes/any"
"github.com/micro/go-micro/errors"
"github.com/ory/ladon"
"go.uber.org/zap"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/auth/claim"
"github.com/pydio/cells/common/log"
"github.com/pydio/cells/common/micro"
"github.com/pydio/cells/common/proto/idm"
"github.com/pydio/cells/common/proto/rest"
"github.com/pydio/cells/common/service/proto"
"github.com/pydio/cells/common/utils/permissions"
)
// CheckOIDCPolicies builds a local policies checker by loading "oidc"-resource policies and putting them in
// an in-memory ladon.Manager. It reloads policies every 1mn.
func checkOIDCPolicies(ctx context.Context, user *idm.User) error {
subjects := permissions.PolicyRequestSubjectsFromUser(user)
policyContext := make(map[string]string)
permissions.PolicyContextFromMetadata(policyContext, ctx)
checker, err := permissions.CachedPoliciesChecker(ctx, "oidc")
if err != nil {
return err
}
if checker == nil {
log.Logger(ctx).Warn("Policies checker is not yet ready - Ignoring")
return nil
}
reqCtx := ladon.Context{}
for k, v := range policyContext {
reqCtx[k] = v
}
// check that at least one of the subject is allowed
var allow bool
for _, subject := range subjects {
request := &ladon.Request{
Resource: "oidc",
Subject: subject,
Action: "login",
Context: reqCtx,
}
if err := checker.IsAllowed(request); err != nil && err == ladon.ErrRequestForcefullyDenied {
break
} else if err == nil {
allow = true
} // Else "default deny" => continue checking
}
if !allow {
return fmt.Errorf("access denied by oidc policy denies access")
}
return nil
}
// SubjectsForResourcePolicyQuery prepares a slice of strings that will be used to check for resource ownership.
// Can be extracted either from context or by loading a given user ID from database.
func SubjectsForResourcePolicyQuery(ctx context.Context, q *rest.ResourcePolicyQuery) (subjects []string, err error) {
if q == nil {
q = &rest.ResourcePolicyQuery{Type: rest.ResourcePolicyQuery_CONTEXT}
}
switch q.Type {
case rest.ResourcePolicyQuery_ANY, rest.ResourcePolicyQuery_NONE:
var value interface{}
if value = ctx.Value(claim.ContextKey); value == nil {
return subjects, errors.BadRequest("resources", "Only admin profiles can list resources of other users")
}
claims := value.(claim.Claims)
if claims.Profile != common.PydioProfileAdmin {
return subjects, errors.Forbidden("resources", "Only admin profiles can list resources with ANY or NONE filter")
}
return subjects, nil
case rest.ResourcePolicyQuery_CONTEXT:
subjects = append(subjects, "*")
if value := ctx.Value(claim.ContextKey); value != nil {
claims := value.(claim.Claims)
subjects = append(subjects, "user:"+claims.Name)
// Add all profiles up to the current one (e.g admin will check for anon, shared, standard, admin)
for _, p := range common.PydioUserProfiles {
subjects = append(subjects, "profile:"+p)
if p == claims.Profile {
break
}
}
//subjects = append(subjects, "profile:"+claims.Profile)
for _, r := range strings.Split(claims.Roles, ",") {
subjects = append(subjects, "role:"+r)
}
} else if uName, _ := permissions.FindUserNameInContext(ctx); uName != "" {
u, e := permissions.SearchUniqueUser(ctx, uName, "")
if e == nil {
subjects = append(subjects, "user:"+u.Login)
for _, p := range common.PydioUserProfiles {
subjects = append(subjects, "profile:"+p)
if p == u.Attributes[idm.UserAttrProfile] {
break
}
}
for _, r := range u.Roles {
subjects = append(subjects, r.Uuid)
}
} else if uName == common.PydioSystemUsername {
subjects = append(subjects, "profile:"+common.PydioProfileAdmin)
} else {
log.Logger(ctx).Error("Cannot find user " + uName + ", although in context")
}
} else {
log.Logger(ctx).Error("Cannot find claims in context", zap.Any("c", ctx))
subjects = append(subjects, "profile:anon")
}
case rest.ResourcePolicyQuery_USER:
if q.UserId == "" {
return subjects, errors.BadRequest("resources", "Please provide a non-empty user id")
}
var value interface{}
if value = ctx.Value(claim.ContextKey); value == nil {
return subjects, errors.BadRequest("resources", "Only admin profiles can list resources of other users")
}
claims := value.(claim.Claims)
if claims.Profile != common.PydioProfileAdmin {
return subjects, errors.Forbidden("resources", "Only admin profiles can list resources of other users")
}
subjects = append(subjects, "*")
subQ, _ := ptypes.MarshalAny(&idm.UserSingleQuery{
Uuid: q.UserId,
})
uClient := idm.NewUserServiceClient(common.ServiceGrpcNamespace_+common.ServiceUser, defaults.NewClient())
if stream, e := uClient.SearchUser(ctx, &idm.SearchUserRequest{
Query: &service.Query{SubQueries: []*any.Any{subQ}},
}); e == nil {
var user *idm.User
for {
resp, err := stream.Recv()
if err != nil {
break
}
if resp == nil {
continue
}
user = resp.User
break
}
if user == nil {
return subjects, errors.BadRequest("resources", "Cannot find user with id "+q.UserId)
}
for _, role := range user.Roles {
subjects = append(subjects, "role:"+role.Uuid)
}
subjects = append(subjects, "user:"+user.Login)
subjects = append(subjects, "profile:"+user.Attributes["profile"])
} else {
err = e
}
}
return
}