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// Copyright 2020 Matthew Holt
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package acme
import (
"fmt"
"go.uber.org/zap/zapcore"
)
// Problem carries the details of an error from HTTP APIs as
// defined in RFC 7807: https://tools.ietf.org/html/rfc7807
// and as extended by RFC 8555 §6.7:
// https://tools.ietf.org/html/rfc8555#section-6.7
type Problem struct {
// "type" (string) - A URI reference [RFC3986] that identifies the
// problem type. This specification encourages that, when
// dereferenced, it provide human-readable documentation for the
// problem type (e.g., using HTML [W3C.REC-html5-20141028]). When
// this member is not present, its value is assumed to be
// "about:blank". §3.1
Type string `json:"type"`
// "title" (string) - A short, human-readable summary of the problem
// type. It SHOULD NOT change from occurrence to occurrence of the
// problem, except for purposes of localization (e.g., using
// proactive content negotiation; see [RFC7231], Section 3.4). §3.1
Title string `json:"title,omitempty"`
// "status" (number) - The HTTP status code ([RFC7231], Section 6)
// generated by the origin server for this occurrence of the problem.
// §3.1
Status int `json:"status,omitempty"`
// "detail" (string) - A human-readable explanation specific to this
// occurrence of the problem. §3.1
//
// RFC 8555 §6.7: "Clients SHOULD display the 'detail' field of all
// errors."
Detail string `json:"detail,omitempty"`
// "instance" (string) - A URI reference that identifies the specific
// occurrence of the problem. It may or may not yield further
// information if dereferenced. §3.1
Instance string `json:"instance,omitempty"`
// "Sometimes a CA may need to return multiple errors in response to a
// request. Additionally, the CA may need to attribute errors to
// specific identifiers. For instance, a newOrder request may contain
// multiple identifiers for which the CA cannot issue certificates. In
// this situation, an ACME problem document MAY contain the
// 'subproblems' field, containing a JSON array of problem documents."
// RFC 8555 §6.7.1
Subproblems []Subproblem `json:"subproblems,omitempty"`
// For convenience, we've added this field to associate with a value
// that is related to or caused the problem. It is not part of the
// spec, but, if a challenge fails for example, we can associate the
// error with the problematic authz object by setting this field.
// Challenge failures will have this set to an Authorization type.
Resource interface{} `json:"-"`
}
func (p Problem) Error() string {
// TODO: 7.3.3: Handle changes to Terms of Service (notice it uses the Instance field and Link header)
// RFC 8555 §6.7: "Clients SHOULD display the 'detail' field of all errors."
s := fmt.Sprintf("HTTP %d %s - %s", p.Status, p.Type, p.Detail)
if len(p.Subproblems) > 0 {
for _, v := range p.Subproblems {
s += fmt.Sprintf(", problem %q: %s", v.Type, v.Detail)
if v.Identifier.Type != "" || v.Identifier.Value != "" {
s += fmt.Sprintf(" (%s_identifier=%s)", v.Identifier.Type, v.Identifier.Value)
}
}
}
if p.Instance != "" {
s += ", url: " + p.Instance
}
return s
}
// MarshalLogObject satisfies the zapcore.ObjectMarshaler interface.
// This allows problems to be serialized by the zap logger.
func (p Problem) MarshalLogObject(enc zapcore.ObjectEncoder) error {
enc.AddString("type", p.Type)
enc.AddString("title", p.Title)
enc.AddString("detail", p.Detail)
enc.AddString("instance", p.Instance)
enc.AddArray("subproblems", loggableSubproblems(p.Subproblems))
return nil
}
// Subproblem describes a more specific error in a problem according to
// RFC 8555 §6.7.1: "An ACME problem document MAY contain the
// 'subproblems' field, containing a JSON array of problem documents,
// each of which MAY contain an 'identifier' field."
type Subproblem struct {
Problem
// "If present, the 'identifier' field MUST contain an ACME
// identifier (Section 9.7.7)." §6.7.1
Identifier Identifier `json:"identifier,omitempty"`
}
// MarshalLogObject satisfies the zapcore.ObjectMarshaler interface.
// This allows subproblems to be serialized by the zap logger.
func (sp Subproblem) MarshalLogObject(enc zapcore.ObjectEncoder) error {
enc.AddString("identifier_type", sp.Identifier.Type)
enc.AddString("identifier", sp.Identifier.Value)
enc.AddObject("subproblem", sp.Problem)
return nil
}
type loggableSubproblems []Subproblem
// MarshalLogArray satisfies the zapcore.ArrayMarshaler interface.
// This allows a list of subproblems to be serialized by the zap logger.
func (ls loggableSubproblems) MarshalLogArray(enc zapcore.ArrayEncoder) error {
for _, sp := range ls {
enc.AppendObject(sp)
}
return nil
}
// Standard token values for the "type" field of problems, as defined
// in RFC 8555 §6.7: https://tools.ietf.org/html/rfc8555#section-6.7
//
// "To facilitate automatic response to errors, this document defines the
// following standard tokens for use in the 'type' field (within the
// ACME URN namespace 'urn:ietf:params:acme:error:') ... This list is not
// exhaustive. The server MAY return errors whose 'type' field is set to
// a URI other than those defined above."
const (
// The ACME error URN prefix.
ProblemTypeNamespace = "urn:ietf:params:acme:error:"
ProblemTypeAccountDoesNotExist = ProblemTypeNamespace + "accountDoesNotExist"
ProblemTypeAlreadyRevoked = ProblemTypeNamespace + "alreadyRevoked"
ProblemTypeBadCSR = ProblemTypeNamespace + "badCSR"
ProblemTypeBadNonce = ProblemTypeNamespace + "badNonce"
ProblemTypeBadPublicKey = ProblemTypeNamespace + "badPublicKey"
ProblemTypeBadRevocationReason = ProblemTypeNamespace + "badRevocationReason"
ProblemTypeBadSignatureAlgorithm = ProblemTypeNamespace + "badSignatureAlgorithm"
ProblemTypeCAA = ProblemTypeNamespace + "caa"
ProblemTypeCompound = ProblemTypeNamespace + "compound"
ProblemTypeConnection = ProblemTypeNamespace + "connection"
ProblemTypeDNS = ProblemTypeNamespace + "dns"
ProblemTypeExternalAccountRequired = ProblemTypeNamespace + "externalAccountRequired"
ProblemTypeIncorrectResponse = ProblemTypeNamespace + "incorrectResponse"
ProblemTypeInvalidContact = ProblemTypeNamespace + "invalidContact"
ProblemTypeMalformed = ProblemTypeNamespace + "malformed"
ProblemTypeOrderNotReady = ProblemTypeNamespace + "orderNotReady"
ProblemTypeRateLimited = ProblemTypeNamespace + "rateLimited"
ProblemTypeRejectedIdentifier = ProblemTypeNamespace + "rejectedIdentifier"
ProblemTypeServerInternal = ProblemTypeNamespace + "serverInternal"
ProblemTypeTLS = ProblemTypeNamespace + "tls"
ProblemTypeUnauthorized = ProblemTypeNamespace + "unauthorized"
ProblemTypeUnsupportedContact = ProblemTypeNamespace + "unsupportedContact"
ProblemTypeUnsupportedIdentifier = ProblemTypeNamespace + "unsupportedIdentifier"
ProblemTypeUserActionRequired = ProblemTypeNamespace + "userActionRequired"
)
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