more light refactoring

1 files changed, 0 insertions, 487 deletions

diff --git a/internal/utils/x509.go b/internal/utils/x509.go
deleted file mode 100644
index bf99334..0000000
--- a/internal/utils/x509.go
+++ /dev/null
@@ -1,487 +0,0 @@
-package utils
-
-import (
-	"fmt"
-
-	ct "github.com/google/certificate-transparency-go"
-	"github.com/google/certificate-transparency-go/asn1"
-	"github.com/google/certificate-transparency-go/x509/pkix"
-)
-
-// Mozilla Public License Version 2.0
-// ==================================
-//
-// 1. Definitions
-// --------------
-//
-// 1.1. "Contributor"
-//
-//	means each individual or legal entity that creates, contributes to
-//	the creation of, or owns Covered Software.
-//
-// 1.2. "Contributor Version"
-//
-//	means the combination of the Contributions of others (if any) used
-//	by a Contributor and that particular Contributor's Contribution.
-//
-// 1.3. "Contribution"
-//
-//	means Covered Software of a particular Contributor.
-//
-// 1.4. "Covered Software"
-//
-//	means Source Code Form to which the initial Contributor has attached
-//	the notice in Exhibit A, the Executable Form of such Source Code
-//	Form, and Modifications of such Source Code Form, in each case
-//	including portions thereof.
-//
-// 1.5. "Incompatible With Secondary Licenses"
-//
-//	means
-//
-//	(a) that the initial Contributor has attached the notice described
-//	    in Exhibit B to the Covered Software; or
-//
-//	(b) that the Covered Software was made available under the terms of
-//	    version 1.1 or earlier of the License, but not also under the
-//	    terms of a Secondary License.
-//
-// 1.6. "Executable Form"
-//
-//	means any form of the work other than Source Code Form.
-//
-// 1.7. "Larger Work"
-//
-//	means a work that combines Covered Software with other material, in
-//	a separate file or files, that is not Covered Software.
-//
-// 1.8. "License"
-//
-//	means this document.
-//
-// 1.9. "Licensable"
-//
-//	means having the right to grant, to the maximum extent possible,
-//	whether at the time of the initial grant or subsequently, any and
-//	all of the rights conveyed by this License.
-//
-// 1.10. "Modifications"
-//
-//	means any of the following:
-//
-//	(a) any file in Source Code Form that results from an addition to,
-//	    deletion from, or modification of the contents of Covered
-//	    Software; or
-//
-//	(b) any new file in Source Code Form that contains any Covered
-//	    Software.
-//
-// 1.11. "Patent Claims" of a Contributor
-//
-//	means any patent claim(s), including without limitation, method,
-//	process, and apparatus claims, in any patent Licensable by such
-//	Contributor that would be infringed, but for the grant of the
-//	License, by the making, using, selling, offering for sale, having
-//	made, import, or transfer of either its Contributions or its
-//	Contributor Version.
-//
-// 1.12. "Secondary License"
-//
-//	means either the GNU General Public License, Version 2.0, the GNU
-//	Lesser General Public License, Version 2.1, the GNU Affero General
-//	Public License, Version 3.0, or any later versions of those
-//	licenses.
-//
-// 1.13. "Source Code Form"
-//
-//	means the form of the work preferred for making modifications.
-//
-// 1.14. "You" (or "Your")
-//
-//	means an individual or a legal entity exercising rights under this
-//	License. For legal entities, "You" includes any entity that
-//	controls, is controlled by, or is under common control with You. For
-//	purposes of this definition, "control" means (a) the power, direct
-//	or indirect, to cause the direction or management of such entity,
-//	whether by contract or otherwise, or (b) ownership of more than
-//	fifty percent (50%) of the outstanding shares or beneficial
-//	ownership of such entity.
-//
-// 2. License Grants and Conditions
-// --------------------------------
-//
-// 2.1. Grants
-//
-// Each Contributor hereby grants You a world-wide, royalty-free,
-// non-exclusive license:
-//
-// (a) under intellectual property rights (other than patent or trademark)
-//
-//	Licensable by such Contributor to use, reproduce, make available,
-//	modify, display, perform, distribute, and otherwise exploit its
-//	Contributions, either on an unmodified basis, with Modifications, or
-//	as part of a Larger Work; and
-//
-// (b) under Patent Claims of such Contributor to make, use, sell, offer
-//
-//	for sale, have made, import, and otherwise transfer either its
-//	Contributions or its Contributor Version.
-//
-// 2.2. Effective Date
-//
-// The licenses granted in Section 2.1 with respect to any Contribution
-// become effective for each Contribution on the date the Contributor first
-// distributes such Contribution.
-//
-// 2.3. Limitations on Grant Scope
-//
-// The licenses granted in this Section 2 are the only rights granted under
-// this License. No additional rights or licenses will be implied from the
-// distribution or licensing of Covered Software under this License.
-// Notwithstanding Section 2.1(b) above, no patent license is granted by a
-// Contributor:
-//
-// (a) for any code that a Contributor has removed from Covered Software;
-//
-//	or
-//
-// (b) for infringements caused by: (i) Your and any other third party's
-//
-//	modifications of Covered Software, or (ii) the combination of its
-//	Contributions with other software (except as part of its Contributor
-//	Version); or
-//
-// (c) under Patent Claims infringed by Covered Software in the absence of
-//
-//	its Contributions.
-//
-// This License does not grant any rights in the trademarks, service marks,
-// or logos of any Contributor (except as may be necessary to comply with
-// the notice requirements in Section 3.4).
-//
-// 2.4. Subsequent Licenses
-//
-// No Contributor makes additional grants as a result of Your choice to
-// distribute the Covered Software under a subsequent version of this
-// License (see Section 10.2) or under the terms of a Secondary License (if
-// permitted under the terms of Section 3.3).
-//
-// 2.5. Representation
-//
-// Each Contributor represents that the Contributor believes its
-// Contributions are its original creation(s) or it has sufficient rights
-// to grant the rights to its Contributions conveyed by this License.
-//
-// 2.6. Fair Use
-//
-// This License is not intended to limit any rights You have under
-// applicable copyright doctrines of fair use, fair dealing, or other
-// equivalents.
-//
-// 2.7. Conditions
-//
-// Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
-// in Section 2.1.
-//
-// 3. Responsibilities
-// -------------------
-//
-// 3.1. Distribution of Source Form
-//
-// All distribution of Covered Software in Source Code Form, including any
-// Modifications that You create or to which You contribute, must be under
-// the terms of this License. You must inform recipients that the Source
-// Code Form of the Covered Software is governed by the terms of this
-// License, and how they can obtain a copy of this License. You may not
-// attempt to alter or restrict the recipients' rights in the Source Code
-// Form.
-//
-// 3.2. Distribution of Executable Form
-//
-// If You distribute Covered Software in Executable Form then:
-//
-// (a) such Covered Software must also be made available in Source Code
-//
-//	Form, as described in Section 3.1, and You must inform recipients of
-//	the Executable Form how they can obtain a copy of such Source Code
-//	Form by reasonable means in a timely manner, at a charge no more
-//	than the cost of distribution to the recipient; and
-//
-// (b) You may distribute such Executable Form under the terms of this
-//
-//	License, or sublicense it under different terms, provided that the
-//	license for the Executable Form does not attempt to limit or alter
-//	the recipients' rights in the Source Code Form under this License.
-//
-// 3.3. Distribution of a Larger Work
-//
-// You may create and distribute a Larger Work under terms of Your choice,
-// provided that You also comply with the requirements of this License for
-// the Covered Software. If the Larger Work is a combination of Covered
-// Software with a work governed by one or more Secondary Licenses, and the
-// Covered Software is not Incompatible With Secondary Licenses, this
-// License permits You to additionally distribute such Covered Software
-// under the terms of such Secondary License(s), so that the recipient of
-// the Larger Work may, at their option, further distribute the Covered
-// Software under the terms of either this License or such Secondary
-// License(s).
-//
-// 3.4. Notices
-//
-// You may not remove or alter the substance of any license notices
-// (including copyright notices, patent notices, disclaimers of warranty,
-// or limitations of liability) contained within the Source Code Form of
-// the Covered Software, except that You may alter any license notices to
-// the extent required to remedy known factual inaccuracies.
-//
-// 3.5. Application of Additional Terms
-//
-// You may choose to offer, and to charge a fee for, warranty, support,
-// indemnity or liability obligations to one or more recipients of Covered
-// Software. However, You may do so only on Your own behalf, and not on
-// behalf of any Contributor. You must make it absolutely clear that any
-// such warranty, support, indemnity, or liability obligation is offered by
-// You alone, and You hereby agree to indemnify every Contributor for any
-// liability incurred by such Contributor as a result of warranty, support,
-// indemnity or liability terms You offer. You may include additional
-// disclaimers of warranty and limitations of liability specific to any
-// jurisdiction.
-//
-// 4. Inability to Comply Due to Statute or Regulation
-// ---------------------------------------------------
-//
-// If it is impossible for You to comply with any of the terms of this
-// License with respect to some or all of the Covered Software due to
-// statute, judicial order, or regulation then You must: (a) comply with
-// the terms of this License to the maximum extent possible; and (b)
-// describe the limitations and the code they affect. Such description must
-// be placed in a text file included with all distributions of the Covered
-// Software under this License. Except to the extent prohibited by statute
-// or regulation, such description must be sufficiently detailed for a
-// recipient of ordinary skill to be able to understand it.
-//
-// 5. Termination
-// --------------
-//
-// 5.1. The rights granted under this License will terminate automatically
-// if You fail to comply with any of its terms. However, if You become
-// compliant, then the rights granted under this License from a particular
-// Contributor are reinstated (a) provisionally, unless and until such
-// Contributor explicitly and finally terminates Your grants, and (b) on an
-// ongoing basis, if such Contributor fails to notify You of the
-// non-compliance by some reasonable means prior to 60 days after You have
-// come back into compliance. Moreover, Your grants from a particular
-// Contributor are reinstated on an ongoing basis if such Contributor
-// notifies You of the non-compliance by some reasonable means, this is the
-// first time You have received notice of non-compliance with this License
-// from such Contributor, and You become compliant prior to 30 days after
-// Your receipt of the notice.
-//
-// 5.2. If You initiate litigation against any entity by asserting a patent
-// infringement claim (excluding declaratory judgment actions,
-// counter-claims, and cross-claims) alleging that a Contributor Version
-// directly or indirectly infringes any patent, then the rights granted to
-// You by any and all Contributors for the Covered Software under Section
-// 2.1 of this License shall terminate.
-//
-// 5.3. In the event of termination under Sections 5.1 or 5.2 above, all
-// end user license agreements (excluding distributors and resellers) which
-// have been validly granted by You or Your distributors under this License
-// prior to termination shall survive termination.
-//
-// ************************************************************************
-// *                                                                      *
-// *  6. Disclaimer of Warranty                                           *
-// *  -------------------------                                           *
-// *                                                                      *
-// *  Covered Software is provided under this License on an "as is"       *
-// *  basis, without warranty of any kind, either expressed, implied, or  *
-// *  statutory, including, without limitation, warranties that the       *
-// *  Covered Software is free of defects, merchantable, fit for a        *
-// *  particular purpose or non-infringing. The entire risk as to the     *
-// *  quality and performance of the Covered Software is with You.        *
-// *  Should any Covered Software prove defective in any respect, You     *
-// *  (not any Contributor) assume the cost of any necessary servicing,   *
-// *  repair, or correction. This disclaimer of warranty constitutes an   *
-// *  essential part of this License. No use of any Covered Software is   *
-// *  authorized under this License except under this disclaimer.         *
-// *                                                                      *
-// ************************************************************************
-//
-// ************************************************************************
-// *                                                                      *
-// *  7. Limitation of Liability                                          *
-// *  --------------------------                                          *
-// *                                                                      *
-// *  Under no circumstances and under no legal theory, whether tort      *
-// *  (including negligence), contract, or otherwise, shall any           *
-// *  Contributor, or anyone who distributes Covered Software as          *
-// *  permitted above, be liable to You for any direct, indirect,         *
-// *  special, incidental, or consequential damages of any character      *
-// *  including, without limitation, damages for lost profits, loss of    *
-// *  goodwill, work stoppage, computer failure or malfunction, or any    *
-// *  and all other commercial damages or losses, even if such party      *
-// *  shall have been informed of the possibility of such damages. This   *
-// *  limitation of liability shall not apply to liability for death or   *
-// *  personal injury resulting from such party's negligence to the       *
-// *  extent applicable law prohibits such limitation. Some               *
-// *  jurisdictions do not allow the exclusion or limitation of           *
-// *  incidental or consequential damages, so this exclusion and          *
-// *  limitation may not apply to You.                                    *
-// *                                                                      *
-// ************************************************************************
-//
-// 8. Litigation
-// -------------
-//
-// Any litigation relating to this License may be brought only in the
-// courts of a jurisdiction where the defendant maintains its principal
-// place of business and such litigation shall be governed by laws of that
-// jurisdiction, without reference to its conflict-of-law provisions.
-// Nothing in this Section shall prevent a party's ability to bring
-// cross-claims or counter-claims.
-//
-// 9. Miscellaneous
-// ----------------
-//
-// This License represents the complete agreement concerning the subject
-// matter hereof. If any provision of this License is held to be
-// unenforceable, such provision shall be reformed only to the extent
-// necessary to make it enforceable. Any law or regulation which provides
-// that the language of a contract shall be construed against the drafter
-// shall not be used to construe this License against a Contributor.
-//
-// 10. Versions of the License
-// ---------------------------
-//
-// 10.1. New Versions
-//
-// Mozilla Foundation is the license steward. Except as provided in Section
-// 10.3, no one other than the license steward has the right to modify or
-// publish new versions of this License. Each version will be given a
-// distinguishing version number.
-//
-// 10.2. Effect of New Versions
-//
-// You may distribute the Covered Software under the terms of the version
-// of the License under which You originally received the Covered Software,
-// or under the terms of any subsequent version published by the license
-// steward.
-//
-// 10.3. Modified Versions
-//
-// If you create software not governed by this License, and you want to
-// create a new license for such software, you may create and use a
-// modified version of this License if you rename the license and remove
-// any references to the name of the license steward (except to note that
-// such modified license differs from this License).
-//
-// 10.4. Distributing Source Code Form that is Incompatible With Secondary
-// Licenses
-//
-// If You choose to distribute Source Code Form that is Incompatible With
-// Secondary Licenses under the terms of this version of the License, the
-// notice described in Exhibit B of this License must be attached.
-//
-// Exhibit A - Source Code Form License Notice
-// -------------------------------------------
-//
-//	This Source Code Form is subject to the terms of the Mozilla Public
-//	License, v. 2.0. If a copy of the MPL was not distributed with this
-//	file, You can obtain one at http://mozilla.org/MPL/2.0/.
-//
-// If it is not possible or desirable to put the notice in a particular
-// file, then You may include the notice in a location (such as a LICENSE
-// file in a relevant directory) where a recipient would be likely to look
-// for such a notice.
-//
-// You may add additional accurate notices of copyright ownership.
-//
-// Exhibit B - "Incompatible With Secondary Licenses" Notice
-// ---------------------------------------------------------
-//
-//	This Source Code Form is "Incompatible With Secondary Licenses", as
-//	defined by the Mozilla Public License, v. 2.0.
-//
-// From:
-// https://gitlab.torproject.org/tpo/onion-services/sauteed-onions/monitor/-/blob/main/follow-go/main.go#L115-124
-// https://gitlab.torproject.org/tpo/onion-services/sauteed-onions/monitor/-/blob/main/follow-go/x509.go
-// https://github.com/SSLMate/certspotter/blob/54f34077d3bebe8aafce07dcfbffeb928c6e1d04/x509.go#L380
-
-func SANsFromLeafEntries(startIndex int64, leafEntries []ct.LeafEntry) (sans []string, errs []error) {
-	for offset, leafEntry := range leafEntries {
-		leafIndex := startIndex + int64(offset)
-		e, err := ct.LogEntryFromLeaf(leafIndex, &leafEntry)
-		if err != nil {
-			errs = append(errs, fmt.Errorf("leaf at index %d: %v", leafIndex, err))
-			continue
-		}
-		s, err := sansFromLogEntry(e)
-		if err != nil {
-			errs = append(errs, fmt.Errorf("leaf at index %d: %v", leafIndex, err))
-		}
-		sans = append(sans, s...)
-	}
-	return
-}
-
-func sansFromLogEntry(entry *ct.LogEntry) ([]string, error) {
-	if entry.Precert == nil && entry.X509Cert == nil {
-		return nil, fmt.Errorf("no (pre)cert in log entry")
-	}
-	if entry.Precert != nil && entry.X509Cert != nil {
-		return nil, fmt.Errorf("both precert and cert in log entry")
-	}
-
-	var exts []pkix.Extension
-	if entry.Precert != nil {
-		exts = entry.Precert.TBSCertificate.Extensions
-	}
-	if entry.X509Cert != nil {
-		exts = entry.X509Cert.Extensions
-	}
-
-	var sans []string
-	for _, ext := range exts {
-		if ext.Id.Equal(asn1.ObjectIdentifier{2, 5, 29, 17}) {
-			moreSANs, err := extract(ext)
-			if err != nil {
-				return nil, fmt.Errorf("parse: %v", err)
-			}
-
-			sans = append(sans, moreSANs...)
-		}
-	}
-	return sans, nil
-}
-
-func extract(extSAN pkix.Extension) ([]string, error) {
-	var seq asn1.RawValue
-	rest, err := asn1.Unmarshal(extSAN.Value, &seq)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse subjectAltName extension: %v", err)
-	}
-	if len(rest) != 0 {
-		// Don't complain if the SAN is followed by exactly one zero byte, which is a common error.
-		if !(len(rest) == 1 && rest[0] == 0) {
-			return nil, fmt.Errorf("trailing data in subjectAltName extension: %v", rest)
-		}
-	}
-	if !seq.IsCompound || seq.Tag != 16 || seq.Class != 0 {
-		return nil, fmt.Errorf("failed to parse subjectAltName extension: bad SAN sequence")
-	}
-
-	sans := []string{}
-	buf := seq.Bytes
-	for len(buf) > 0 {
-		var val asn1.RawValue
-		var err error
-		buf, err = asn1.Unmarshal(buf, &val)
-		if err != nil {
-			return nil, fmt.Errorf("failed to parse subjectAltName extension item: %v", err)
-		}
-
-		sans = append(sans, string(val.Bytes))
-	}
-	return sans, nil
-}