structured_cms/timestamp/
check.rs

1//! Complete common timestamp checks; path/status/policy acceptance stays external.
2
3use super::profile::{
4    self, MappedProfileCheckError, ProfileCheckError, ProfileFailure, ProfileInput,
5};
6use super::{
7    AuthorityFacts, ImprintAgreement, RecognitionError, Request, RequestAgreement, RequestFields,
8    RequestWindow, RetainedFacts, SignatureError, Timeliness, Token, TokenExtension,
9    TokenSignature, TsaIdentity, TsaUsage,
10};
11use crate::{
12    Error, ErrorCode,
13    content_source::{ContentError, SourceMap},
14    directory, ess,
15    provider::{SignatureAnswer, SignatureProvider},
16    stream::Source,
17    verify,
18};
19use core::convert::Infallible;
20use structured_asn1::{
21    Reader,
22    memory::{Execution, OwnedVec, Work},
23    value::OwnedOid,
24};
25use structured_pkix::{
26    Certificate,
27    path::WorkingKey,
28    temporal::{Instant, LeapTable},
29};
30
31/// Original parsed request and its producing reader, not reconstructed tuples.
32pub struct Requested<'a, 'r> {
33    /// Complete original request.
34    pub request: &'r Request<'a>,
35    /// Its own original producing session.
36    pub parent: &'r Reader<'a>,
37}
38
39/// Explicit caller selection/time facts; this does not select a trusted path.
40pub struct CheckContext<'a, 'r> {
41    /// Caller-selected candidate, independently subject to trust/path checks.
42    pub certificate: &'r Certificate<'a>,
43    /// That certificate's own original producing reader.
44    pub certificate_parent: &'r Reader<'a>,
45    /// Effective key retaining independently established inherited parameters.
46    pub key: WorkingKey<'a>,
47    /// Complete live request, absent for archived evidence.
48    pub requested: Option<Requested<'a, 'r>>,
49    /// Explicit UTC correction facts, without implicit clock lookup.
50    pub utc: &'r LeapTable<'a>,
51    /// Caller-supplied comparison instant, when available.
52    pub reference: Option<Instant>,
53    /// Caller-established outstanding-imprint uniqueness/window fact.
54    pub window: Option<RequestWindow>,
55}
56
57/// Scoped execution refusal retaining the actual source/operand and cause.
58#[derive(Debug)]
59pub enum InfoCheckError<SE, PE, RE> {
60    /// Inspection retained schema faults; complete execution did not start.
61    Nonconforming {
62        /// Original information range, interpreted through the accompanying map.
63        span: structured_asn1::Span,
64    },
65    /// Original CMS execution failed after information syntax preflight.
66    Signature(SignatureError<PE>),
67    /// Original ESS execution failed after information syntax preflight.
68    Ess(ess::BindingError<PE>),
69    /// Original token processing/resource refusal.
70    Processing(Error),
71    /// Source-map retention refusal already located at a physical carrier.
72    /// Do not project this offset again as a logical token coordinate.
73    Provenance(Error),
74    /// Covered-content acquisition or selected digest execution failed.
75    Imprint(super::ImprintError<SE, PE>),
76    /// Complete request-imprint comparison failed.
77    RequestImprint(super::RequestImprintError<PE>),
78    /// Request nonce/policy comparison failed.
79    RequestField(super::RequestFieldError),
80    /// Token/certificate source role and original refusal.
81    Authority(super::AuthorityError),
82    /// Original extension handler refusal.
83    Recognition(RecognitionError<RE>),
84}
85
86/// Execution refusal, never a semantic partial success.
87#[derive(Debug)]
88pub enum CheckError<SE, PE, RE> {
89    /// Original envelope/ESS inspection faults prevent complete execution.
90    Nonconforming {
91        /// Original outer field enclosure, not a resource error.
92        span: structured_asn1::Span,
93    },
94    /// Original outer processing/resource refusal.
95    Processing(Error),
96    /// Caller supplied a different original SPKI for the selected certificate.
97    KeyMismatch {
98        /// Honest enclosure of the selected certificate, not a document fault.
99        certificate: structured_asn1::Span,
100    },
101    /// Certificate hint comparison failed, not a mismatch.
102    Identifier(directory::Error),
103    /// Request source role and original refusal are preserved.
104    RequestField(super::RequestFieldError),
105    /// Scoped original cause accompanied by independently retained source map.
106    Information(ContentError<super::InfoError<InfoCheckError<SE, PE, RE>>>),
107}
108
109/// A check in a logical CMS envelope retains its own source context separately
110/// from the inner `TSTInfo` map. CMS errors must not use `TSTInfo` coordinates.
111#[derive(Debug)]
112pub enum MappedCheckError<SE, PE, RE> {
113    /// Caller source/session mismatch, refused before map admission or work.
114    /// The original operand identifies its reader; no copied map is required.
115    Preflight(CheckError<SE, PE, RE>),
116    /// Envelope map admission failed at its already physical carrier.
117    Provenance(Error),
118    /// Original cause and independently retained envelope coordinate context.
119    Execution {
120        /// Maps the original CMS envelope's coordinates, not inner `TSTInfo`.
121        envelope: SourceMap,
122        /// Original check cause; source/operand variants select its context.
123        source: CheckError<SE, PE, RE>,
124    },
125}
126
127/// Independently retained cryptographic/time evidence, not a trust verdict.
128/// The caller must establish TSA path/status, enforce signed ESS restrictions
129/// and apply algorithm/policy permissions before granting product acceptance.
130#[derive(Debug)]
131pub struct Evidence {
132    facts: RetainedFacts,
133    source: SourceMap,
134}
135
136/// Independent-copy refusal retains the coordinate context of its cause.
137#[derive(Debug)]
138pub enum EvidenceCopyError {
139    /// Map admission failed at its already physical carrier enclosure.
140    Provenance(Error),
141    /// Fact admission failed in logical/original fact coordinates.
142    Facts {
143        /// Original refusal, unchanged and distinct from verification failure.
144        source: Error,
145        /// Independent map surviving source evidence/parser drop.
146        context: SourceMap,
147    },
148}
149impl Evidence {
150    /// Makes a genuine independently charged copy, without infallible Clone.
151    /// Map admission precedes fact copying so an inner refusal can retain its
152    /// provenance without allocating while already handling that refusal.
153    #[expect(
154        clippy::result_large_err,
155        reason = "retain admitted source metadata with the original copy refusal; an error box would itself require unavailable capacity"
156    )]
157    pub fn try_copy_in<W: Work>(&self, work: &W) -> Result<Self, EvidenceCopyError> {
158        let context = self
159            .source
160            .try_copy_in(work)
161            .map_err(EvidenceCopyError::Provenance)?;
162        match self.facts.try_copy_in(work) {
163            Ok(facts) => Ok(Self {
164                facts,
165                source: context,
166            }),
167            Err(source) => Err(EvidenceCopyError::Facts { source, context }),
168        }
169    }
170    /// Generation/imprint facts bound to this successfully checked token.
171    #[must_use]
172    pub fn facts(&self) -> &RetainedFacts {
173        &self.facts
174    }
175    /// Independent original physical projection of logical facts.
176    #[must_use]
177    pub fn source(&self) -> &SourceMap {
178        &self.source
179    }
180}
181
182/// Common check facts including original ESS validation-set restrictions.
183pub struct CheckedTimestamp<'a> {
184    /// Actual CMS signature/content or explicit unusable preparation answer.
185    pub signature: TokenSignature<'a>,
186    /// Selected-certificate hint agreement, not pool uniqueness/trust.
187    pub identifier: directory::CertificateAgreement,
188    /// Original independent V1/V2 identifiers and signed path restrictions.
189    pub ess: ess::SigningAttributes<'a>,
190    /// Independent selected-certificate binding answers.
191    pub bindings: ess::Bindings,
192    /// Required TSA purpose and optional name agreement.
193    pub authority: AuthorityFacts,
194    /// Complete caller-covered-content agreement.
195    pub imprint: ImprintAgreement,
196    /// Complete live request-imprint equality, when supplied.
197    pub requested_imprint: Option<RequestAgreement>,
198    /// Independent requested nonce/policy agreement.
199    pub requested_fields: Option<RequestFields>,
200    /// Certificate carriage requirement, when requested.
201    pub carried: Option<bool>,
202    /// Explicit freshness answer, without an implicitly read clock.
203    pub timeliness: Timeliness,
204    /// Readable Accuracy scalar refusal, without clamping/narrowing.
205    pub accuracy_error: Option<super::DeviationError>,
206    /// Unknown critical identifiers with independently retained charges.
207    pub unknown_critical: OwnedVec<OwnedOid>,
208    evidence: Option<Evidence>,
209}
210impl CheckedTimestamp<'_> {
211    /// Moves independently retained evidence out while keeping every original
212    /// negative/check fact available to a scoped format adapter. No copy or
213    /// second signature/content pass occurs, and mutable public facts still
214    /// cannot manufacture evidence.
215    pub fn take_evidence(&mut self) -> Option<Evidence> {
216        self.evidence.take()
217    }
218    /// Moves retained evidence without deep copy or another storage charge.
219    pub fn into_evidence(self) -> Option<Evidence> {
220        self.evidence
221    }
222    /// Only the checker constructs evidence; editing public facts cannot do so.
223    #[must_use]
224    pub fn evidence(&self) -> Option<&Evidence> {
225        self.evidence.as_ref()
226    }
227}
228
229struct Information {
230    authority: AuthorityFacts,
231    imprint: ImprintAgreement,
232    requested_imprint: Option<RequestAgreement>,
233    requested_fields: Option<RequestFields>,
234    timeliness: Timeliness,
235    accuracy_error: Option<super::DeviationError>,
236    unknown: OwnedVec<OwnedOid>,
237    evidence: Option<Evidence>,
238}
239
240impl Information {
241    fn holds(&self) -> bool {
242        self.accuracy_error.is_none()
243            && matches!(self.authority.usage, TsaUsage::TimeStampingOnly)
244            && matches!(
245                self.authority.identity,
246                TsaIdentity::Absent | TsaIdentity::Matches
247            )
248            && self.imprint == ImprintAgreement::Matches
249            && self
250                .requested_imprint
251                .is_none_or(|answer| answer == RequestAgreement::Matches)
252            && self
253                .requested_fields
254                .is_none_or(|fields| fields.nonce != Some(false) && fields.policy != Some(false))
255            && self.unknown.is_empty()
256            && matches!(
257                self.timeliness,
258                Timeliness::NotRequested | Timeliness::LocalWindow | Timeliness::RequestNonce
259            )
260    }
261}
262
263struct Inspection<'a, 'r, P, S, R> {
264    provider: &'a P,
265    context: &'r CheckContext<'a, 'r>,
266    covered: &'r mut S,
267    recognizes: &'r mut R,
268    common_holds: bool,
269}
270
271impl<P, S: Source, R> Inspection<'_, '_, P, S, R> {
272    fn inspect<'scope, PE, RE>(
273        &mut self,
274        info: &super::TokenInfo<'scope>,
275        inside: &Reader<'scope>,
276        source: &SourceMap,
277    ) -> Result<Information, InfoCheckError<S::Error, PE, RE>>
278    where
279        P: for<'input> SignatureProvider<'input, Error = PE>,
280        R: FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
281    {
282        let authority = info
283            .authority(
284                self.context.certificate,
285                inside,
286                self.context.certificate_parent,
287            )
288            .map_err(InfoCheckError::Authority)?;
289        let requested_fields = self
290            .context
291            .requested
292            .as_ref()
293            .map(|request| info.matches_request_fields(request.request, inside, request.parent))
294            .transpose()
295            .map_err(InfoCheckError::RequestField)?;
296        let unknown = unrecognized(info, inside, self.recognizes)?;
297        let (imprint, requested_imprint) = match &self.context.requested {
298            Some(request) => {
299                let (imprint, agreement) = info
300                    .imprint()
301                    .check_requested_content(
302                        request.request.imprint(),
303                        self.provider,
304                        (inside, request.parent),
305                        self.covered,
306                    )
307                    .map_err(|error| match error {
308                        super::RequestedContentError::Request(source) => {
309                            InfoCheckError::RequestImprint(source)
310                        }
311                        super::RequestedContentError::Content(source) => {
312                            InfoCheckError::Imprint(source)
313                        }
314                    })?;
315                (imprint, Some(agreement))
316            }
317            None => (
318                info.imprint()
319                    .check_content(self.provider, inside, self.covered)
320                    .map_err(InfoCheckError::Imprint)?,
321                None,
322            ),
323        };
324        let (accuracy, accuracy_error) = match info
325            .accuracy()
326            .map(super::AccuracyReading::deviation)
327            .transpose()
328        {
329            Ok(accuracy) => (accuracy, None),
330            Err(error) => (None, Some(error)),
331        };
332        let timeliness = super::timeliness(
333            info.gen_time(),
334            accuracy,
335            self.context.utc,
336            self.context.reference,
337            self.context.requested.is_some(),
338            requested_fields.and_then(|fields| fields.nonce),
339            self.context.window,
340        );
341        let mut information = Information {
342            authority,
343            imprint,
344            requested_imprint,
345            requested_fields,
346            timeliness,
347            accuracy_error,
348            unknown,
349            evidence: None,
350        };
351        if self.common_holds && !info.has_faults() && information.holds() {
352            information.evidence = Some(Evidence {
353                facts: info
354                    .retain_facts(inside)
355                    .map_err(InfoCheckError::Processing)?,
356                source: source
357                    .try_copy_in(&inside.execution())
358                    .map_err(InfoCheckError::Provenance)?,
359            });
360        }
361        Ok(information)
362    }
363}
364
365fn unrecognized<SE, PE, RE>(
366    info: &super::TokenInfo<'_>,
367    inside: &Reader<'_>,
368    recognizes: &mut impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
369) -> Result<OwnedVec<OwnedOid>, InfoCheckError<SE, PE, RE>> {
370    let scoped = inside.execution();
371    let mut unknown = scoped.vector();
372    if let Some(extensions) = info.extensions() {
373        for kind in extensions
374            .unrecognized_critical(inside, recognizes)
375            .map_err(InfoCheckError::Recognition)?
376        {
377            let owned = OwnedOid::from_oid_in(kind, &scoped).map_err(|reason| {
378                InfoCheckError::Processing(Error::resource(
379                    reason,
380                    "tstInfo.extensions",
381                    extensions.span().start,
382                ))
383            })?;
384            unknown.try_push(owned).map_err(|reason| {
385                InfoCheckError::Processing(Error::resource(
386                    reason,
387                    "tstInfo.extensions",
388                    extensions.span().start,
389                ))
390            })?;
391        }
392    }
393    Ok(unknown.into_owned())
394}
395
396fn common_holds(
397    signature: &TokenSignature<'_>,
398    bindings: ess::Bindings,
399    identifier: &directory::CertificateAgreement,
400    carried: Option<bool>,
401) -> bool {
402    matches!(signature, TokenSignature::Checked(checked)
403        if checked.signature() == Some(SignatureAnswer::Valid)
404        && matches!(checked.content(), verify::ContentAgreement::Matches | verify::ContentAgreement::Direct))
405        && (bindings.v1 == Some(ess::Binding::Matches)
406            || bindings.v2 == Some(ess::Binding::Matches))
407        && bindings
408            .v1
409            .is_none_or(|binding| binding == ess::Binding::Matches)
410        && bindings
411            .v2
412            .is_none_or(|binding| binding == ess::Binding::Matches)
413        && matches!(identifier, directory::CertificateAgreement::Matches)
414        && carried != Some(false)
415}
416
417impl<'doc> Token<'doc> {
418    /// Checks original CMS, ESS, TSA, content, request and time together.
419    ///
420    /// Caller path/status/policy and signed ESS restriction enforcement remain
421    /// external. Semantic negatives remain facts, never evidence. Processing,
422    /// provider and source refusals abort. Provider errors are source-independent
423    /// so a temporary joined information buffer cannot escape in their type.
424    /// Optional rejection of unlisted digest algorithms (RFC5652 §5.3) belongs
425    /// to caller policy. Evidence does not assert that every sender SHOULD or
426    /// application-profile requirement was satisfied.
427    #[expect(
428        clippy::result_large_err,
429        reason = "preserve original cause and accounted source context without allocating on refusal"
430    )]
431    pub fn check<'a, P, S: Source, PE, RE>(
432        &'a self,
433        provider: &'a P,
434        parent: &Reader<'a>,
435        context: &CheckContext<'a, '_>,
436        covered: &mut S,
437        recognizes: impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
438    ) -> Result<CheckedTimestamp<'a>, CheckError<S::Error, PE, RE>>
439    where
440        'doc: 'a,
441        P: for<'scope> SignatureProvider<'scope, Error = PE>,
442    {
443        self.check_with_profile(provider, parent, context, covered, recognizes, |_| {
444            Ok::<(), ProfileFailure<Infallible>>(())
445        })
446        .map_err(ProfileCheckError::into_common)
447    }
448
449    /// Checks the same common timestamp once, with a scoped profile inspection
450    /// before any ESS binding, provider resolution, signature/content execution
451    /// or extension-recognition callback. Original syntax faults still refuse
452    /// first. The profile sees original fields, both producing readers and
453    /// their coordinate contexts; it must fund its own work before execution.
454    /// Refusal is terminal and cannot borrow a temporary information buffer.
455    /// The common core does not roll back external side effects of the profile.
456    #[expect(
457        clippy::result_large_err,
458        reason = "keep opaque common/profile refusal and its source context without allocating while returning an error"
459    )]
460    pub fn check_with_profile<'a, P, S: Source, PE, RE, FE>(
461        &'a self,
462        provider: &'a P,
463        parent: &Reader<'a>,
464        context: &CheckContext<'a, '_>,
465        covered: &mut S,
466        recognizes: impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
467        profile: impl for<'view, 'scope> FnOnce(
468            ProfileInput<'view, 'doc, 'a, 'scope>,
469        ) -> Result<(), ProfileFailure<FE>>,
470    ) -> Result<CheckedTimestamp<'a>, ProfileCheckError<S::Error, PE, RE, FE>>
471    where
472        'doc: 'a,
473        P: for<'scope> SignatureProvider<'scope, Error = PE>,
474    {
475        self.check_in(
476            provider,
477            (parent, None),
478            context,
479            covered,
480            recognizes,
481            profile,
482        )
483    }
484
485    /// Checks a token decoded in another joined source using the same core.
486    /// The map corresponds to its producing envelope reader. Child `TSTInfo`
487    /// maps are composed to physical fragments; outer CMS errors separately
488    /// retain the envelope map instead of borrowing a temporary joined buffer.
489    #[expect(
490        clippy::result_large_err,
491        reason = "preserve both source frames and original opaque refusal without a fallible error box"
492    )]
493    pub fn check_mapped<'a, P, S: Source, PE, RE>(
494        &'a self,
495        provider: &'a P,
496        source: (&Reader<'a>, &SourceMap),
497        context: &CheckContext<'a, '_>,
498        covered: &mut S,
499        recognizes: impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
500    ) -> Result<CheckedTimestamp<'a>, MappedCheckError<S::Error, PE, RE>>
501    where
502        'doc: 'a,
503        P: for<'scope> SignatureProvider<'scope, Error = PE>,
504    {
505        self.check_mapped_with_profile(provider, source, context, covered, recognizes, |_| {
506            Ok::<(), ProfileFailure<Infallible>>(())
507        })
508        .map_err(MappedProfileCheckError::into_common)
509    }
510
511    /// Same profile/core kernel for a logically joined CMS envelope. Both
512    /// independent maps survive refusal; an outer profile location must use
513    /// the envelope map rather than the inner information map. Reader/session
514    /// misuse is refused before map admission or profile/provider dispatch.
515    #[expect(
516        clippy::result_large_err,
517        reason = "preserve both independently retained source frames and the original opaque refusal without a fallible error allocation"
518    )]
519    pub fn check_mapped_with_profile<'a, P, S: Source, PE, RE, FE>(
520        &'a self,
521        provider: &'a P,
522        source: (&Reader<'a>, &SourceMap),
523        context: &CheckContext<'a, '_>,
524        covered: &mut S,
525        recognizes: impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
526        profile: impl for<'view, 'scope> FnOnce(
527            ProfileInput<'view, 'doc, 'a, 'scope>,
528        ) -> Result<(), ProfileFailure<FE>>,
529    ) -> Result<CheckedTimestamp<'a>, MappedProfileCheckError<S::Error, PE, RE, FE>>
530    where
531        'doc: 'a,
532        P: for<'scope> SignatureProvider<'scope, Error = PE>,
533    {
534        let (parent, source) = source;
535        preflight_sessions(self, parent, context)
536            .map_err(|error| MappedProfileCheckError::Preflight(error.into()))?;
537        let envelope = source
538            .try_copy_in(&parent.execution())
539            .map_err(MappedProfileCheckError::Provenance)?;
540        self.check_in(
541            provider,
542            (parent, Some(source)),
543            context,
544            covered,
545            recognizes,
546            profile,
547        )
548        .map_err(|source| MappedProfileCheckError::Execution { envelope, source })
549    }
550
551    #[expect(
552        clippy::result_large_err,
553        reason = "retain original cause and accounted source context on refusal"
554    )]
555    fn check_in<'a, P, S: Source, PE, RE, FE>(
556        &'a self,
557        provider: &'a P,
558        origin: (&Reader<'a>, Option<&SourceMap>),
559        context: &CheckContext<'a, '_>,
560        covered: &mut S,
561        mut recognizes: impl FnMut(&TokenExtension<'_>, &Execution<'_>) -> Result<bool, RE>,
562        profile: impl for<'view, 'scope> FnOnce(
563            ProfileInput<'view, 'doc, 'a, 'scope>,
564        ) -> Result<(), ProfileFailure<FE>>,
565    ) -> Result<CheckedTimestamp<'a>, ProfileCheckError<S::Error, PE, RE, FE>>
566    where
567        'doc: 'a,
568        P: for<'scope> SignatureProvider<'scope, Error = PE>,
569    {
570        let (parent, source) = origin;
571        preflight(self, parent, context).map_err(CheckError::from)?;
572        let certificate = context.certificate;
573        let identifier =
574            directory::matches_certificate_in(self.signer().sid(), certificate, parent)
575                .map_err(CheckError::Identifier)?;
576        let ess =
577            ess::SigningAttributes::read(self.signer(), parent).map_err(CheckError::Processing)?;
578        let carried = context
579            .requested
580            .as_ref()
581            .map(|requested| {
582                self.matches_cert_req(
583                    requested.request,
584                    Some(certificate),
585                    parent,
586                    requested.parent,
587                )
588            })
589            .transpose()
590            .map_err(CheckError::RequestField)?;
591        if !self.faults().is_empty()
592            || !self.message().faults().is_empty()
593            || !self.signer().faults().is_empty()
594            || !ess.faults().is_empty()
595            || ess.v1().is_some_and(|reading| !reading.faults().is_empty())
596            || ess.v2().is_some_and(|reading| !reading.faults().is_empty())
597        {
598            return Err(CheckError::Nonconforming {
599                span: self.message().span(),
600            }
601            .into());
602        }
603        let inspect = |info: &super::TokenInfo<'_>,
604                       inside: &Reader<'_>,
605                       information: &SourceMap|
606         -> Result<_, profile::InformationFailure<S::Error, PE, RE, FE>> {
607            if info.has_faults() {
608                return Err(InfoCheckError::Nonconforming { span: info.span() }.into());
609            }
610            profile(ProfileInput {
611                token: self,
612                parent,
613                envelope: source,
614                ess: &ess,
615                info,
616                reader: inside,
617                source: information,
618            })
619            .map_err(profile::InformationFailure::Profile)?;
620            let bindings = ess
621                .bind_certificate(provider, certificate, parent)
622                .map_err(InfoCheckError::Ess)?;
623            let signature = self
624                .check_signature(provider, context.key, parent)
625                .map_err(InfoCheckError::Signature)?;
626            let common_holds = common_holds(&signature, bindings, &identifier, carried);
627            let mut inspection = Inspection {
628                provider,
629                context,
630                covered,
631                recognizes: &mut recognizes,
632                common_holds,
633            };
634            let checked = inspection.inspect(info, inside, information)?;
635            Ok((signature, bindings, checked))
636        };
637        let (signature, bindings, information) = match source {
638            Some(source) => self.with_info_mapped(parent, source, inspect),
639            None => self.with_info(parent, inspect),
640        }
641        .map_err(profile::information_error)?;
642        Ok(CheckedTimestamp {
643            signature,
644            identifier,
645            ess,
646            bindings,
647            authority: information.authority,
648            imprint: information.imprint,
649            requested_imprint: information.requested_imprint,
650            requested_fields: information.requested_fields,
651            carried,
652            timeliness: information.timeliness,
653            accuracy_error: information.accuracy_error,
654            unknown_critical: information.unknown,
655            evidence: information.evidence,
656        })
657    }
658}
659
660enum PreflightError {
661    Processing(Error),
662    Requested(super::RequestFieldError),
663    KeyMismatch(structured_asn1::Span),
664}
665
666impl<SE, PE, RE> From<PreflightError> for CheckError<SE, PE, RE> {
667    fn from(error: PreflightError) -> Self {
668        match error {
669            PreflightError::Processing(error) => Self::Processing(error),
670            PreflightError::Requested(error) => Self::RequestField(error),
671            PreflightError::KeyMismatch(certificate) => Self::KeyMismatch { certificate },
672        }
673    }
674}
675
676fn preflight(
677    token: &Token<'_>,
678    parent: &Reader<'_>,
679    context: &CheckContext<'_, '_>,
680) -> Result<(), PreflightError> {
681    preflight_sessions(token, parent, context)?;
682    let certificate = context.certificate;
683    let written = certificate.tbs().public_key().as_bytes();
684    let key = context.key.key().as_bytes();
685    let length = u64::try_from(written.len().max(key.len()))
686        .ok()
687        .and_then(|length| length.checked_add(1))
688        .ok_or_else(|| {
689            PreflightError::Processing(Error::schema(
690                ErrorCode::LengthOverflow,
691                "certificate.subjectPublicKeyInfo",
692                certificate.span().start,
693            ))
694        })?;
695    parent.execution().charge_work(length).map_err(|reason| {
696        PreflightError::Processing(Error::resource(
697            reason,
698            "certificate.subjectPublicKeyInfo",
699            certificate.span().start,
700        ))
701    })?;
702    if written != key {
703        return Err(PreflightError::KeyMismatch(certificate.span()));
704    }
705    Ok(())
706}
707
708fn preflight_sessions(
709    token: &Token<'_>,
710    parent: &Reader<'_>,
711    context: &CheckContext<'_, '_>,
712) -> Result<(), PreflightError> {
713    token
714        .signer()
715        .require_session(parent, "signerInfo")
716        .map_err(PreflightError::Processing)?;
717    let certificate = context.certificate;
718    if !certificate
719        .tbs()
720        .public_key()
721        .algorithm()
722        .same_session(context.certificate_parent)
723    {
724        return Err(PreflightError::Processing(Error::pkix(
725            structured_pkix::Error::new(
726                structured_pkix::ErrorCode::ForeignReader,
727                "certificate",
728                certificate.span().start,
729            ),
730        )));
731    }
732    if let Some(requested) = &context.requested
733        && !requested.request.same_session(requested.parent)
734    {
735        return Err(PreflightError::Requested(super::RequestFieldError {
736            operand: super::ImprintOperand::Requested,
737            source: Error::pkix(structured_pkix::Error::new(
738                structured_pkix::ErrorCode::ForeignReader,
739                "timeStampReq",
740                requested.request.span().start,
741            )),
742        }));
743    }
744    Ok(())
745}
structured_cms/timestamp/check.rs

structured_cms/timestamp/
check.rs
