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assertstate.go
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assertstate.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2019 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// Package assertstate implements the manager and state aspects responsible
// for the enforcement of assertions in the system and manages the system-wide
// assertion database.
package assertstate
import (
"errors"
"fmt"
"strings"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/asserts/snapasserts"
"github.com/snapcore/snapd/httputil"
"github.com/snapcore/snapd/logger"
"github.com/snapcore/snapd/overlord/snapstate"
"github.com/snapcore/snapd/overlord/state"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/snap"
)
// Add the given assertion to the system assertion database.
func Add(s *state.State, a asserts.Assertion) error {
// TODO: deal together with asserts itself with (cascading) side effects of possible assertion updates
return cachedDB(s).Add(a)
}
// AddBatch adds the given assertion batch to the system assertion database.
func AddBatch(s *state.State, batch *asserts.Batch, opts *asserts.CommitOptions) error {
return batch.CommitTo(cachedDB(s), opts)
}
func findError(format string, ref *asserts.Ref, err error) error {
if errors.Is(err, &asserts.NotFoundError{}) {
return fmt.Errorf(format, ref)
} else {
return fmt.Errorf(format+": %v", ref, err)
}
}
type RefreshAssertionsOptions struct {
IsAutoRefresh bool
// IsRefreshOfAllSnaps indicates if assertions are refreshed together with
// all installed snaps, which means validation set assertions can be refreshed
// as well. It is implied if IsAutoRefresh is true.
IsRefreshOfAllSnaps bool
}
// RefreshSnapDeclarations refetches all the current snap declarations and their prerequisites.
func RefreshSnapDeclarations(s *state.State, userID int, opts *RefreshAssertionsOptions) error {
if opts == nil {
opts = &RefreshAssertionsOptions{}
}
deviceCtx, err := snapstate.DevicePastSeeding(s, nil)
if err != nil {
return err
}
snapStates, err := snapstate.All(s)
if err != nil {
return nil
}
err = bulkRefreshSnapDeclarations(s, snapStates, userID, deviceCtx, opts)
if err == nil {
// done
return nil
}
if _, ok := err.(*bulkAssertionFallbackError); !ok {
// not an error that indicates the server rejecting/failing
// the bulk request itself
return err
}
logger.Noticef("bulk refresh of snap-declarations failed, falling back to one-by-one assertion fetching: %v", err)
modelAs := deviceCtx.Model()
fetching := func(f asserts.Fetcher) error {
for instanceName, snapst := range snapStates {
sideInfo := snapst.CurrentSideInfo()
if sideInfo.SnapID == "" {
continue
}
if err := snapasserts.FetchSnapDeclaration(f, sideInfo.SnapID); err != nil {
if notRetried, ok := err.(*httputil.PersistentNetworkError); ok {
return notRetried
}
return fmt.Errorf("cannot refresh snap-declaration for %q: %v", instanceName, err)
}
}
// fetch store assertion if available
if modelAs.Store() != "" {
err := snapasserts.FetchStore(f, modelAs.Store())
if err != nil && !errors.Is(err, &asserts.NotFoundError{}) {
return err
}
}
return nil
}
return doFetch(s, userID, deviceCtx, nil, fetching)
}
type refreshControlError struct {
errs []error
}
func (e *refreshControlError) Error() string {
if len(e.errs) == 1 {
return e.errs[0].Error()
}
l := []string{""}
for _, e := range e.errs {
l = append(l, e.Error())
}
return fmt.Sprintf("refresh control errors:%s", strings.Join(l, "\n - "))
}
// ValidateRefreshes validates the refresh candidate revisions represented by
// the snapInfos, looking for the needed refresh control validation assertions,
// it returns a validated subset in validated and a summary error if not all
// candidates validated. ignoreValidation is a set of snap-instance-names that
// should not be gated.
func ValidateRefreshes(s *state.State, snapInfos []*snap.Info, ignoreValidation map[string]bool, userID int, deviceCtx snapstate.DeviceContext) (validated []*snap.Info, err error) {
// maps gated snap-ids to gating snap-ids
controlled := make(map[string][]string)
// maps gating snap-ids to their snap names
gatingNames := make(map[string]string)
db := DB(s)
snapStates, err := snapstate.All(s)
if err != nil {
return nil, err
}
for instanceName, snapst := range snapStates {
info, err := snapst.CurrentInfo()
if err != nil {
return nil, err
}
if info.SnapID == "" {
continue
}
gatingID := info.SnapID
if gatingNames[gatingID] != "" {
continue
}
a, err := db.Find(asserts.SnapDeclarationType, map[string]string{
"series": release.Series,
"snap-id": gatingID,
})
if err != nil {
return nil, fmt.Errorf("internal error: cannot find snap declaration for installed snap %q: %v", instanceName, err)
}
decl := a.(*asserts.SnapDeclaration)
control := decl.RefreshControl()
if len(control) == 0 {
continue
}
gatingNames[gatingID] = decl.SnapName()
for _, gatedID := range control {
controlled[gatedID] = append(controlled[gatedID], gatingID)
}
}
var errs []error
for _, candInfo := range snapInfos {
if ignoreValidation[candInfo.InstanceName()] {
validated = append(validated, candInfo)
continue
}
gatedID := candInfo.SnapID
gating := controlled[gatedID]
if len(gating) == 0 { // easy case, no refresh control
validated = append(validated, candInfo)
continue
}
var validationRefs []*asserts.Ref
fetching := func(f asserts.Fetcher) error {
for _, gatingID := range gating {
valref := &asserts.Ref{
Type: asserts.ValidationType,
PrimaryKey: []string{release.Series, gatingID, gatedID, candInfo.Revision.String()},
}
err := f.Fetch(valref)
if notFound, ok := err.(*asserts.NotFoundError); ok && notFound.Type == asserts.ValidationType {
return fmt.Errorf("no validation by %q", gatingNames[gatingID])
}
if err != nil {
return fmt.Errorf("cannot find validation by %q: %v", gatingNames[gatingID], err)
}
validationRefs = append(validationRefs, valref)
}
return nil
}
err := doFetch(s, userID, deviceCtx, nil, fetching)
if err != nil {
errs = append(errs, fmt.Errorf("cannot refresh %q to revision %s: %v", candInfo.InstanceName(), candInfo.Revision, err))
continue
}
var revoked *asserts.Validation
for _, valref := range validationRefs {
a, err := valref.Resolve(db.Find)
if err != nil {
return nil, findError("internal error: cannot find just fetched %v", valref, err)
}
if val := a.(*asserts.Validation); val.Revoked() {
revoked = val
break
}
}
if revoked != nil {
errs = append(errs, fmt.Errorf("cannot refresh %q to revision %s: validation by %q (id %q) revoked", candInfo.InstanceName(), candInfo.Revision, gatingNames[revoked.SnapID()], revoked.SnapID()))
continue
}
validated = append(validated, candInfo)
}
if errs != nil {
return validated, &refreshControlError{errs}
}
return validated, nil
}
// BaseDeclaration returns the base-declaration assertion with policies governing all snaps.
func BaseDeclaration(s *state.State) (*asserts.BaseDeclaration, error) {
// TODO: switch keeping this in the DB and have it revisioned/updated
// via the store
baseDecl := asserts.BuiltinBaseDeclaration()
if baseDecl == nil {
return nil, &asserts.NotFoundError{Type: asserts.BaseDeclarationType}
}
return baseDecl, nil
}
// SnapDeclaration returns the snap-declaration for the given snap-id if it is present in the system assertion database.
func SnapDeclaration(s *state.State, snapID string) (*asserts.SnapDeclaration, error) {
db := DB(s)
a, err := db.Find(asserts.SnapDeclarationType, map[string]string{
"series": release.Series,
"snap-id": snapID,
})
if err != nil {
return nil, err
}
return a.(*asserts.SnapDeclaration), nil
}
// Publisher returns the account assertion for publisher of the given snap-id if it is present in the system assertion database.
func Publisher(s *state.State, snapID string) (*asserts.Account, error) {
db := DB(s)
a, err := db.Find(asserts.SnapDeclarationType, map[string]string{
"series": release.Series,
"snap-id": snapID,
})
if err != nil {
return nil, err
}
snapDecl := a.(*asserts.SnapDeclaration)
a, err = db.Find(asserts.AccountType, map[string]string{
"account-id": snapDecl.PublisherID(),
})
if err != nil {
return nil, fmt.Errorf("internal error: cannot find account assertion for the publisher of snap %q: %v", snapDecl.SnapName(), err)
}
return a.(*asserts.Account), nil
}
// PublisherStoreAccount returns the store account information from the publisher assertion.
func PublisherStoreAccount(st *state.State, snapID string) (snap.StoreAccount, error) {
if snapID == "" {
return snap.StoreAccount{}, nil
}
pubAcct, err := Publisher(st, snapID)
if err != nil {
return snap.StoreAccount{}, fmt.Errorf("cannot find publisher details: %v", err)
}
return snap.StoreAccount{
ID: pubAcct.AccountID(),
Username: pubAcct.Username(),
DisplayName: pubAcct.DisplayName(),
Validation: pubAcct.Validation(),
}, nil
}
// Store returns the store assertion with the given name/id if it is
// present in the system assertion database.
func Store(s *state.State, store string) (*asserts.Store, error) {
db := DB(s)
a, err := db.Find(asserts.StoreType, map[string]string{
"store": store,
})
if err != nil {
return nil, err
}
return a.(*asserts.Store), nil
}
// AutoAliases returns the explicit automatic aliases alias=>app mapping for the given installed snap.
func AutoAliases(s *state.State, info *snap.Info) (map[string]string, error) {
if info.SnapID == "" {
// without declaration
return nil, nil
}
decl, err := SnapDeclaration(s, info.SnapID)
if err != nil {
return nil, fmt.Errorf("internal error: cannot find snap-declaration for installed snap %q: %v", info.InstanceName(), err)
}
explicitAliases := decl.Aliases()
if len(explicitAliases) != 0 {
aliasesForApps := make(map[string]string, len(explicitAliases))
for alias, app := range explicitAliases {
if _, ok := info.Apps[app]; ok {
aliasesForApps[alias] = app
}
}
return aliasesForApps, nil
}
// XXX: old header fallback, just to keep edge working while we fix the
// store, to remove before next release!
oldAutoAliases := decl.AutoAliases()
if len(oldAutoAliases) == 0 {
return nil, nil
}
res := make(map[string]string, len(oldAutoAliases))
for _, alias := range oldAutoAliases {
app := info.LegacyAliases[alias]
if app == nil {
// not a known alias anymore or yet, skip
continue
}
res[alias] = app.Name
}
return res, nil
}
func delayedCrossMgrInit() {
// hook validation of refreshes into snapstate logic
snapstate.ValidateRefreshes = ValidateRefreshes
// hook auto refresh of assertions (snap declarations) into snapstate
snapstate.AutoRefreshAssertions = AutoRefreshAssertions
// hook retrieving auto-aliases into snapstate logic
snapstate.AutoAliases = AutoAliases
// hook the helper for getting enforced validation sets
snapstate.EnforcedValidationSets = TrackedEnforcedValidationSets
// hook the helper for saving current validation sets to the stack
snapstate.AddCurrentTrackingToValidationSetsStack = addCurrentTrackingToValidationSetsHistory
// hook the helper for restoring validation sets tracking from the stack
snapstate.RestoreValidationSetsTracking = RestoreValidationSetsTracking
// hook helper for enforcing validation sets without fetching them
snapstate.EnforceValidationSets = ApplyEnforcedValidationSets
// hook helper for enforcing already existing validation set assertions
snapstate.EnforceLocalValidationSets = ApplyLocalEnforcedValidationSets
}
// AutoRefreshAssertions tries to refresh all assertions
func AutoRefreshAssertions(s *state.State, userID int) error {
opts := &RefreshAssertionsOptions{IsAutoRefresh: true}
if err := RefreshSnapDeclarations(s, userID, opts); err != nil {
return err
}
return RefreshValidationSetAssertions(s, userID, opts)
}
// RefreshSnapAssertions tries to refresh all snap-centered assertions
func RefreshSnapAssertions(s *state.State, userID int, opts *RefreshAssertionsOptions) error {
if opts == nil {
opts = &RefreshAssertionsOptions{}
}
opts.IsAutoRefresh = false
if err := RefreshSnapDeclarations(s, userID, opts); err != nil {
return err
}
if !opts.IsRefreshOfAllSnaps {
return nil
}
return RefreshValidationSetAssertions(s, userID, opts)
}
// RefreshValidationSetAssertions tries to refresh all validation set
// assertions.
func RefreshValidationSetAssertions(s *state.State, userID int, opts *RefreshAssertionsOptions) error {
if opts == nil {
opts = &RefreshAssertionsOptions{}
}
deviceCtx, err := snapstate.DevicePastSeeding(s, nil)
if err != nil {
return err
}
vsets, err := ValidationSets(s)
if err != nil {
return err
}
if len(vsets) == 0 {
return nil
}
monitorModeSets := make(map[string]*ValidationSetTracking)
enforceModeSets := make(map[string]*ValidationSetTracking)
for vk, vset := range vsets {
if vset.Mode == Monitor {
monitorModeSets[vk] = vset
} else {
enforceModeSets[vk] = vset
}
}
updateTracking := func(sets map[string]*ValidationSetTracking) error {
// update validation set tracking state
for _, vs := range sets {
if vs.PinnedAt == 0 {
headers := map[string]string{
"series": release.Series,
"account-id": vs.AccountID,
"name": vs.Name,
}
db := DB(s)
as, err := db.FindSequence(asserts.ValidationSetType, headers, -1, asserts.ValidationSetType.MaxSupportedFormat())
if err != nil {
return fmt.Errorf("internal error: cannot find assertion %v when refreshing validation-set assertions", headers)
}
if vs.Current != as.Sequence() {
vs.Current = as.Sequence()
UpdateValidationSet(s, vs)
}
}
}
return nil
}
if err := bulkRefreshValidationSetAsserts(s, monitorModeSets, nil, userID, deviceCtx, opts); err != nil {
return err
}
if err := updateTracking(monitorModeSets); err != nil {
return err
}
checkConflictsAndPresence := func(db *asserts.Database, bs asserts.Backstore) error {
vsets := snapasserts.NewValidationSets()
tmpDb := db.WithStackedBackstore(bs)
for _, vs := range enforceModeSets {
headers := map[string]string{
"series": release.Series,
"account-id": vs.AccountID,
"name": vs.Name,
}
var err error
var as asserts.Assertion
if vs.PinnedAt > 0 {
headers["sequence"] = fmt.Sprintf("%d", vs.PinnedAt)
as, err = tmpDb.Find(asserts.ValidationSetType, headers)
} else {
as, err = tmpDb.FindSequence(asserts.ValidationSetType, headers, -1, asserts.ValidationSetType.MaxSupportedFormat())
}
if err != nil {
return fmt.Errorf("internal error: cannot find validation set assertion: %v", err)
}
vsass, ok := as.(*asserts.ValidationSet)
if !ok {
return fmt.Errorf("internal error: unexpected assertion type %s for %s", as.Type().Name, ValidationSetKey(vs.AccountID, vs.Name))
}
if err := vsets.Add(vsass); err != nil {
return fmt.Errorf("internal error: cannot check validation sets conflicts: %v", err)
}
}
if err := vsets.Conflict(); err != nil {
return err
}
snaps, ignoreValidation, err := snapstate.InstalledSnaps(s)
if err != nil {
return err
}
err = vsets.CheckInstalledSnaps(snaps, ignoreValidation)
if verr, ok := err.(*snapasserts.ValidationSetsValidationError); ok {
if len(verr.InvalidSnaps) > 0 || len(verr.MissingSnaps) > 0 {
return verr
}
// ignore wrong revisions
return nil
}
return err
}
if err := bulkRefreshValidationSetAsserts(s, enforceModeSets, checkConflictsAndPresence, userID, deviceCtx, opts); err != nil {
if _, ok := err.(*snapasserts.ValidationSetsConflictError); ok {
logger.Noticef("cannot refresh to conflicting validation set assertions: %v", err)
return nil
}
if _, ok := err.(*snapasserts.ValidationSetsValidationError); ok {
logger.Noticef("cannot refresh to validation set assertions that do not satisfy installed snaps: %v", err)
return nil
}
return err
}
if err := updateTracking(enforceModeSets); err != nil {
return err
}
return nil
}
// ResolveOptions carries extra options for ValidationSetAssertionForMonitor.
type ResolveOptions struct {
AllowLocalFallback bool
}
// validationSetAssertionForMonitor tries to fetch or refresh the validation
// set assertion with accountID/name/sequence (sequence is optional) using pool.
// If assertion cannot be fetched but exists locally and opts.AllowLocalFallback
// is set then the local one is returned
func validationSetAssertionForMonitor(st *state.State, accountID, name string, sequence int, pinned bool, userID int, opts *ResolveOptions) (as *asserts.ValidationSet, local bool, err error) {
if opts == nil {
opts = &ResolveOptions{}
}
deviceCtx, err := snapstate.DevicePastSeeding(st, nil)
if err != nil {
return nil, false, err
}
var vs asserts.Assertion
headers := map[string]string{
"series": release.Series,
"account-id": accountID,
"name": name,
}
db := cachedDB(st)
// try to get existing one from db
if sequence > 0 {
headers["sequence"] = fmt.Sprintf("%d", sequence)
vs, err = db.Find(asserts.ValidationSetType, headers)
} else {
// find latest
vs, err = db.FindSequence(asserts.ValidationSetType, headers, -1, -1)
}
if err != nil && !errors.Is(err, &asserts.NotFoundError{}) {
return nil, false, err
}
if err == nil {
as = vs.(*asserts.ValidationSet)
}
// try to resolve or update with pool
pool := asserts.NewPool(db, maxGroups)
atSeq := &asserts.AtSequence{
Type: asserts.ValidationSetType,
SequenceKey: []string{release.Series, accountID, name},
Sequence: sequence,
Pinned: pinned,
}
if as != nil {
atSeq.Revision = as.Revision()
} else {
atSeq.Revision = asserts.RevisionNotKnown
}
// resolve if not found locally, otherwise add for update
if as == nil {
if err := pool.AddUnresolvedSequence(atSeq, atSeq.Unique()); err != nil {
return nil, false, err
}
} else {
atSeq.Sequence = as.Sequence()
// found locally, try to update
atSeq.Revision = as.Revision()
if err := pool.AddSequenceToUpdate(atSeq, atSeq.Unique()); err != nil {
return nil, false, err
}
}
refreshOpts := &RefreshAssertionsOptions{IsAutoRefresh: false}
if err := resolvePoolNoFallback(st, pool, nil, userID, deviceCtx, refreshOpts); err != nil {
rerr, ok := err.(*resolvePoolError)
if ok && as != nil && opts.AllowLocalFallback {
if e := rerr.errors[atSeq.Unique()]; errors.Is(e, &asserts.NotFoundError{}) {
// fallback: support the scenario of local assertion (snap ack)
// not available in the store.
return as, true, nil
}
}
return nil, false, err
}
// fetch the requested assertion again
if pinned {
vs, err = db.Find(asserts.ValidationSetType, headers)
} else {
vs, err = db.FindSequence(asserts.ValidationSetType, headers, -1, asserts.ValidationSetType.MaxSupportedFormat())
}
if err == nil {
as = vs.(*asserts.ValidationSet)
}
return as, false, err
}
func getSpecificSequenceOrLatest(db *asserts.Database, headers map[string]string) (vs *asserts.ValidationSet, err error) {
var a asserts.Assertion
if _, ok := headers["sequence"]; ok {
a, err = db.Find(asserts.ValidationSetType, headers)
} else {
a, err = db.FindSequence(asserts.ValidationSetType, headers, -1, -1)
}
if err != nil {
return nil, err
}
vs = a.(*asserts.ValidationSet)
return vs, nil
}
// validationSetAssertionForEnforce tries to fetch the validation set assertion
// with the given accountID/name/sequence (sequence is optional) using pool and
// checks if it's not in conflict with existing validation sets in enforcing mode.
func validationSetAssertionForEnforce(st *state.State, accountID, name string, sequence int, userID int, snaps []*snapasserts.InstalledSnap, ignoreValidation map[string]bool) (vs *asserts.ValidationSet, err error) {
deviceCtx, err := snapstate.DevicePastSeeding(st, nil)
if err != nil {
return nil, err
}
// try to get existing from the db. It will be the latest one if it was
// tracked already and thus refreshed via RefreshValidationSetAssertions.
// Otherwise, it may be a local assertion that was tracked in the past and
// then forgotten, in which case we need to refresh it explicitly.
db := cachedDB(st)
headers := map[string]string{
"series": release.Series,
"account-id": accountID,
"name": name,
}
if sequence > 0 {
headers["sequence"] = fmt.Sprintf("%d", sequence)
}
pool := asserts.NewPool(db, maxGroups)
atSeq := &asserts.AtSequence{
Type: asserts.ValidationSetType,
SequenceKey: []string{release.Series, accountID, name},
Sequence: sequence,
Revision: asserts.RevisionNotKnown,
Pinned: sequence > 0,
}
vs, err = getSpecificSequenceOrLatest(db, headers)
checkForConflicts := func() error {
valsets, err := TrackedEnforcedValidationSets(st, vs)
if err != nil {
return err
}
if err := valsets.Conflict(); err != nil {
return err
}
if err := valsets.CheckInstalledSnaps(snaps, ignoreValidation); err != nil {
return err
}
return nil
}
// found locally
if err == nil {
// check if we were tracking it already; if not, that
// means we found an old assertion (it was very likely tracked in the
// past) and we need to update it as it wasn't covered
// by RefreshValidationSetAssertions.
var tr ValidationSetTracking
trerr := GetValidationSet(st, accountID, name, &tr)
if trerr != nil && !errors.Is(trerr, state.ErrNoState) {
return nil, trerr
}
// not tracked, update the assertion
if errors.Is(trerr, state.ErrNoState) {
// update with pool
atSeq.Sequence = vs.Sequence()
atSeq.Revision = vs.Revision()
if err := pool.AddSequenceToUpdate(atSeq, atSeq.Unique()); err != nil {
return nil, err
}
} else {
// was already tracked, add to validation sets and check
if err := checkForConflicts(); err != nil {
return nil, err
}
return vs, nil
}
} else {
if !errors.Is(err, &asserts.NotFoundError{}) {
return nil, err
}
// try to resolve with pool
if err := pool.AddUnresolvedSequence(atSeq, atSeq.Unique()); err != nil {
return nil, err
}
}
checkBeforeCommit := func(db *asserts.Database, bs asserts.Backstore) error {
tmpDb := db.WithStackedBackstore(bs)
// get the resolved validation set assert, add to validation sets and check
vs, err = getSpecificSequenceOrLatest(tmpDb, headers)
if err != nil {
return fmt.Errorf("internal error: cannot find validation set assertion: %v", err)
}
if err := checkForConflicts(); err != nil {
return err
}
// all fine, will be committed (along with its prerequisites if any) on
// return by resolvePoolNoFallback
return nil
}
opts := &RefreshAssertionsOptions{IsAutoRefresh: false}
if err := resolvePoolNoFallback(st, pool, checkBeforeCommit, userID, deviceCtx, opts); err != nil {
return nil, err
}
return vs, err
}
// TryEnforcedValidationSets tries to fetch the given validation sets and
// enforce them (together with currently tracked validation sets) against
// installed snaps, but doesn't update tracking information in case of an error.
// It may return snapasserts.ValidationSetsValidationError which can be used to
// install/remove snaps as required to satisfy validation sets constraints.
func TryEnforcedValidationSets(st *state.State, validationSets []string, userID int, snaps []*snapasserts.InstalledSnap, ignoreValidation map[string]bool) error {
deviceCtx, err := snapstate.DevicePastSeeding(st, nil)
if err != nil {
return err
}
db := cachedDB(st)
pool := asserts.NewPool(db, maxGroups)
extraVsHeaders := make([]map[string]string, 0, len(validationSets))
newTracking := make([]*ValidationSetTracking, 0, len(validationSets))
for _, vsstr := range validationSets {
accountID, name, sequence, err := snapasserts.ParseValidationSet(vsstr)
if err != nil {
return err
}
// try to get existing from the db
headers := map[string]string{
"series": release.Series,
"account-id": accountID,
"name": name,
}
if sequence > 0 {
headers["sequence"] = fmt.Sprintf("%d", sequence)
}
atSeq := &asserts.AtSequence{
Type: asserts.ValidationSetType,
SequenceKey: []string{release.Series, accountID, name},
Sequence: sequence,
Revision: asserts.RevisionNotKnown,
Pinned: sequence > 0,
}
// prepare tracking data, note current is not known yet
tr := &ValidationSetTracking{
AccountID: headers["account-id"],
Name: headers["name"],
Mode: Enforce,
// may be 0 meaning no pinning
PinnedAt: sequence,
}
extraVsHeaders = append(extraVsHeaders, headers)
newTracking = append(newTracking, tr)
vs, err := getSpecificSequenceOrLatest(db, headers)
// found locally
if err == nil {
// update with pool
atSeq.Sequence = vs.Sequence()
atSeq.Revision = vs.Revision()
if err := pool.AddSequenceToUpdate(atSeq, atSeq.Unique()); err != nil {
return err
}
} else {
if !errors.Is(err, &asserts.NotFoundError{}) {
return err
}
// try to resolve with pool
if err := pool.AddUnresolvedSequence(atSeq, atSeq.Unique()); err != nil {
return err
}
}
}
checkBeforeCommit := func(db *asserts.Database, bs asserts.Backstore) error {
tmpDb := db.WithStackedBackstore(bs)
// get the resolved validation set asserts, add to validation sets and check
var extraVs []*asserts.ValidationSet
for _, headers := range extraVsHeaders {
vs, err := getSpecificSequenceOrLatest(tmpDb, headers)
if err != nil {
return fmt.Errorf("internal error: cannot find validation set assertion: %v", err)
}
extraVs = append(extraVs, vs)
}
valsets, err := TrackedEnforcedValidationSets(st, extraVs...)
if err != nil {
return err
}
if err := valsets.Conflict(); err != nil {
return err
}
if err := valsets.CheckInstalledSnaps(snaps, ignoreValidation); err != nil {
// the returned error may be ValidationSetsValidationError which is normal and means we cannot enforce
// the new validation sets - the caller should resolve the error and retry.
return err
}
// all fine, will be committed (along with its prerequisites if any) on
// return by resolvePoolNoFallback
return nil
}
opts := &RefreshAssertionsOptions{}
if err := resolvePoolNoFallback(st, pool, checkBeforeCommit, userID, deviceCtx, opts); err != nil {
return err
}
// no error, all validation-sets can be enforced, update tracking for all vsets
for i, headers := range extraVsHeaders {
tr := newTracking[i]
if tr.PinnedAt == 0 {
// if unpinned, get latest assertion from the db to determine current
a, err := db.FindSequence(asserts.ValidationSetType, headers, -1, -1)
if err != nil {
// this is unexpected since all asserts should be resolved and committed at this point
return fmt.Errorf("internal error: cannot find validation set assertion: %v", err)
}
tr.Current = a.Sequence()
} else {
// no need to get latest since Current must be the same as pinned
tr.Current = tr.PinnedAt
}
}
for _, tr := range newTracking {
UpdateValidationSet(st, tr)
}
return addCurrentTrackingToValidationSetsHistory(st)
}
func resolveValidationSetPrimaryKeys(st *state.State, vsKeys map[string][]string) (map[string]*asserts.ValidationSet, error) {
db := cachedDB(st)
valsets := make(map[string]*asserts.ValidationSet, len(vsKeys))
for key, pk := range vsKeys {
hdrs, err := asserts.HeadersFromPrimaryKey(asserts.ValidationSetType, pk)
if err != nil {
return nil, err
}
a, err := db.Find(asserts.ValidationSetType, hdrs)
if err != nil {
return nil, err
}
valsets[key] = a.(*asserts.ValidationSet)
}
return valsets, nil
}
func validationSetTrackings(valsets map[string]*asserts.ValidationSet, pinnedSeqs map[string]int) ([]*asserts.ValidationSet, []*ValidationSetTracking, error) {
valsetsSlice := make([]*asserts.ValidationSet, 0, len(valsets))
valsetsTracking := make([]*ValidationSetTracking, 0, len(valsets))
for vsKey, vs := range valsets {
pinnedSeq := pinnedSeqs[vsKey]
if pinnedSeq != 0 && pinnedSeq != vs.Sequence() {
// shouldn't be possible save for programmer error since, if we have a pinned
// sequence here, it should've been used when fetching the assertion
return nil, nil, fmt.Errorf("internal error: trying to enforce validation set %q with sequence point %d different than pinned %d",
vsKey, vs.Sequence(), pinnedSeq)
}
tr := &ValidationSetTracking{
AccountID: vs.AccountID(),
Name: vs.Name(),
Mode: Enforce,
Current: vs.Sequence(),
// may be 0 meaning no pinning
PinnedAt: pinnedSeq,
}
valsetsTracking = append(valsetsTracking, tr)
valsetsSlice = append(valsetsSlice, vs)
}
return valsetsSlice, valsetsTracking, nil
}
// ApplyLocalEnforcedValidationSets enforces the supplied validation sets. It takes a map
// of validation set keys to validation sets, pinned sequence numbers (if any),
// installed snaps and ignored snaps. The local in this naming indicates that it uses the
// validation-set primary keys to lookup assertions in the current database. No fetching is
// done contrary to the non-local version.
func ApplyLocalEnforcedValidationSets(st *state.State, vsKeys map[string][]string, pinnedSeqs map[string]int, snaps []*snapasserts.InstalledSnap, ignoreValidation map[string]bool) error {
valsets, err := resolveValidationSetPrimaryKeys(st, vsKeys)
if err != nil {
return err
}
valsetsSlice, valsetsTracking, err := validationSetTrackings(valsets, pinnedSeqs)
if err != nil {
return err
}
valsetGroup, err := TrackedEnforcedValidationSets(st, valsetsSlice...)
if err != nil {
return err
}
if err := valsetGroup.Conflict(); err != nil {
return err
}
if err := valsetGroup.CheckInstalledSnaps(snaps, ignoreValidation); err != nil {
return err
}
for _, tr := range valsetsTracking {
UpdateValidationSet(st, tr)
}
return addCurrentTrackingToValidationSetsHistory(st)
}
// ApplyEnforcedValidationSets enforces the supplied validation sets. It takes a map
// of validation set keys to validation sets, pinned sequence numbers (if any),
// installed snaps and ignored snaps. It fetches any pre-requisites necessary.
func ApplyEnforcedValidationSets(st *state.State, valsets map[string]*asserts.ValidationSet, pinnedSeqs map[string]int, snaps []*snapasserts.InstalledSnap, ignoreValidation map[string]bool, userID int) error {
deviceCtx, err := snapstate.DevicePastSeeding(st, nil)
if err != nil {
return err
}
db := cachedDB(st)
batch := asserts.NewBatch(handleUnsupported(db))
valsetsSlice, valsetsTracking, err := validationSetTrackings(valsets, pinnedSeqs)
if err != nil {
return err
}
err = doFetch(st, userID, deviceCtx, batch, func(f asserts.Fetcher) error {
for vsKey, vs := range valsets {
if err := f.Save(vs); err != nil {
return fmt.Errorf("cannot save assertion %q to batch: %v", vsKey, err)
}
}
return nil
})
if err != nil {
return err
}
valsetGroup, err := TrackedEnforcedValidationSets(st, valsetsSlice...)
if err != nil {
return err
}
if err := valsetGroup.Conflict(); err != nil {
return err
}
if err := valsetGroup.CheckInstalledSnaps(snaps, ignoreValidation); err != nil {