mirror of
https://github.com/caddyserver/caddy.git
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e3e8aabbcf
* core: Refactor, improve listener logic Deprecate: - caddy.Listen - caddy.ListenTimeout - caddy.ListenPacket Prefer caddy.NetworkAddress.Listen() instead. Change: - caddy.ListenQUIC (hopefully to remove later) - caddy.ListenerFunc signature (add context and ListenConfig) - Don't emit Alt-Svc header advertising h3 over HTTP/3 - Use quic.ListenEarly instead of quic.ListenEarlyAddr; this gives us more flexibility (e.g. possibility of HTTP/3 over UDS) but also introduces a new issue: https://github.com/lucas-clemente/quic-go/issues/3560#issuecomment-1258959608 - Unlink unix socket before and after use * Appease the linter * Keep ListenAll
1616 lines
50 KiB
Go
1616 lines
50 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/http"
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"net/netip"
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"net/textproto"
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"net/url"
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"path"
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"reflect"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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"go.uber.org/zap"
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)
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type (
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// MatchHost matches requests by the Host value (case-insensitive).
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//
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// When used in a top-level HTTP route,
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// [qualifying domain names](/docs/automatic-https#hostname-requirements)
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// may trigger [automatic HTTPS](/docs/automatic-https), which automatically
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// provisions and renews certificates for you. Before doing this, you
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// should ensure that DNS records for these domains are properly configured,
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// especially A/AAAA pointed at your server.
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//
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// Automatic HTTPS can be
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// [customized or disabled](/docs/modules/http#servers/automatic_https).
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//
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// Wildcards (`*`) may be used to represent exactly one label of the
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// hostname, in accordance with RFC 1034 (because host matchers are also
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// used for automatic HTTPS which influences TLS certificates). Thus,
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// a host of `*` matches hosts like `localhost` or `internal` but not
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// `example.com`. To catch all hosts, omit the host matcher entirely.
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//
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// The wildcard can be useful for matching all subdomains, for example:
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// `*.example.com` matches `foo.example.com` but not `foo.bar.example.com`.
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//
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// Duplicate entries will return an error.
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MatchHost []string
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// MatchPath case-insensitively matches requests by the URI's path. Path
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// matching is exact, not prefix-based, giving you more control and clarity
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// over matching. Wildcards (`*`) may be used:
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//
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// - At the end only, for a prefix match (`/prefix/*`)
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// - At the beginning only, for a suffix match (`*.suffix`)
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// - On both sides only, for a substring match (`*/contains/*`)
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// - In the middle, for a globular match (`/accounts/*/info`)
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//
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// Slashes are significant; i.e. `/foo*` matches `/foo`, `/foo/`, `/foo/bar`,
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// and `/foobar`; but `/foo/*` does not match `/foo` or `/foobar`. Valid
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// paths start with a slash `/`.
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//
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// Because there are, in general, multiple possible escaped forms of any
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// path, path matchers operate in unescaped space; that is, path matchers
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// should be written in their unescaped form to prevent ambiguities and
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// possible security issues, as all request paths will be normalized to
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// their unescaped forms before matcher evaluation.
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//
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// However, escape sequences in a match pattern are supported; they are
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// compared with the request's raw/escaped path for those bytes only.
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// In other words, a matcher of `/foo%2Fbar` will match a request path
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// of precisely `/foo%2Fbar`, but not `/foo/bar`. It follows that matching
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// the literal percent sign (%) in normalized space can be done using the
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// escaped form, `%25`.
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//
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// Even though wildcards (`*`) operate in the normalized space, the special
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// escaped wildcard (`%*`), which is not a valid escape sequence, may be
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// used in place of a span that should NOT be decoded; that is, `/bands/%*`
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// will match `/bands/AC%2fDC` whereas `/bands/*` will not.
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//
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// Even though path matching is done in normalized space, the special
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// wildcard `%*` may be used in place of a span that should NOT be decoded;
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// that is, `/bands/%*/` will match `/bands/AC%2fDC/` whereas `/bands/*/`
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// will not.
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//
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// This matcher is fast, so it does not support regular expressions or
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// capture groups. For slower but more powerful matching, use the
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// path_regexp matcher. (Note that due to the special treatment of
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// escape sequences in matcher patterns, they may perform slightly slower
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// in high-traffic environments.)
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MatchPath []string
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// MatchPathRE matches requests by a regular expression on the URI's path.
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// Path matching is performed in the unescaped (decoded) form of the path.
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//
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// Upon a match, it adds placeholders to the request: `{http.regexp.name.capture_group}`
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// where `name` is the regular expression's name, and `capture_group` is either
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// the named or positional capture group from the expression itself. If no name
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// is given, then the placeholder omits the name: `{http.regexp.capture_group}`
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// (potentially leading to collisions).
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MatchPathRE struct{ MatchRegexp }
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// MatchMethod matches requests by the method.
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MatchMethod []string
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// MatchQuery matches requests by the URI's query string. It takes a JSON object
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// keyed by the query keys, with an array of string values to match for that key.
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// Query key matches are exact, but wildcards may be used for value matches. Both
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// keys and values may be placeholders.
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// An example of the structure to match `?key=value&topic=api&query=something` is:
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//
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// ```json
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// {
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// "key": ["value"],
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// "topic": ["api"],
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// "query": ["*"]
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// }
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// ```
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//
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// Invalid query strings, including those with bad escapings or illegal characters
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// like semicolons, will fail to parse and thus fail to match.
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MatchQuery url.Values
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// MatchHeader matches requests by header fields. The key is the field
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// name and the array is the list of field values. It performs fast,
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// exact string comparisons of the field values. Fast prefix, suffix,
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// and substring matches can also be done by suffixing, prefixing, or
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// surrounding the value with the wildcard `*` character, respectively.
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// If a list is null, the header must not exist. If the list is empty,
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// the field must simply exist, regardless of its value.
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MatchHeader http.Header
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// MatchHeaderRE matches requests by a regular expression on header fields.
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//
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// Upon a match, it adds placeholders to the request: `{http.regexp.name.capture_group}`
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// where `name` is the regular expression's name, and `capture_group` is either
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// the named or positional capture group from the expression itself. If no name
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// is given, then the placeholder omits the name: `{http.regexp.capture_group}`
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// (potentially leading to collisions).
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MatchHeaderRE map[string]*MatchRegexp
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// MatchProtocol matches requests by protocol. Recognized values are
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// "http", "https", and "grpc" for broad protocol matches, or specific
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// HTTP versions can be specified like so: "http/1", "http/1.1",
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// "http/2", "http/3", or minimum versions: "http/2+", etc.
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MatchProtocol string
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// MatchRemoteIP matches requests by client IP (or CIDR range).
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MatchRemoteIP struct {
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// The IPs or CIDR ranges to match.
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Ranges []string `json:"ranges,omitempty"`
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// If true, prefer the first IP in the request's X-Forwarded-For
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// header, if present, rather than the immediate peer's IP, as
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// the reference IP against which to match. Note that it is easy
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// to spoof request headers. Default: false
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Forwarded bool `json:"forwarded,omitempty"`
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// cidrs and zones vars should aligned always in the same
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// length and indexes for matching later
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cidrs []*netip.Prefix
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zones []string
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logger *zap.Logger
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}
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// MatchNot matches requests by negating the results of its matcher
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// sets. A single "not" matcher takes one or more matcher sets. Each
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// matcher set is OR'ed; in other words, if any matcher set returns
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// true, the final result of the "not" matcher is false. Individual
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// matchers within a set work the same (i.e. different matchers in
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// the same set are AND'ed).
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//
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// NOTE: The generated docs which describe the structure of this
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// module are wrong because of how this type unmarshals JSON in a
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// custom way. The correct structure is:
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//
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// ```json
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// [
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// {},
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// {}
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// ]
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// ```
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//
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// where each of the array elements is a matcher set, i.e. an
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// object keyed by matcher name.
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MatchNot struct {
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MatcherSetsRaw []caddy.ModuleMap `json:"-" caddy:"namespace=http.matchers"`
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MatcherSets []MatcherSet `json:"-"`
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}
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)
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func init() {
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caddy.RegisterModule(MatchHost{})
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caddy.RegisterModule(MatchPath{})
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caddy.RegisterModule(MatchPathRE{})
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caddy.RegisterModule(MatchMethod{})
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caddy.RegisterModule(MatchQuery{})
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caddy.RegisterModule(MatchHeader{})
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caddy.RegisterModule(MatchHeaderRE{})
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caddy.RegisterModule(new(MatchProtocol))
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caddy.RegisterModule(MatchRemoteIP{})
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caddy.RegisterModule(MatchNot{})
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}
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// CaddyModule returns the Caddy module information.
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func (MatchHost) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.matchers.host",
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New: func() caddy.Module { return new(MatchHost) },
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}
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}
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// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
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func (m *MatchHost) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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for d.Next() {
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*m = append(*m, d.RemainingArgs()...)
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if d.NextBlock(0) {
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return d.Err("malformed host matcher: blocks are not supported")
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}
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}
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return nil
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}
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// Provision sets up and validates m, including making it more efficient for large lists.
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func (m MatchHost) Provision(_ caddy.Context) error {
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// check for duplicates; they are nonsensical and reduce efficiency
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// (we could just remove them, but the user should know their config is erroneous)
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seen := make(map[string]int)
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for i, h := range m {
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h = strings.ToLower(h)
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if firstI, ok := seen[h]; ok {
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return fmt.Errorf("host at index %d is repeated at index %d: %s", firstI, i, h)
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}
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seen[h] = i
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}
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if m.large() {
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// sort the slice lexicographically, grouping "fuzzy" entries (wildcards and placeholders)
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// at the front of the list; this allows us to use binary search for exact matches, which
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// we have seen from experience is the most common kind of value in large lists; and any
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// other kinds of values (wildcards and placeholders) are grouped in front so the linear
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// search should find a match fairly quickly
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sort.Slice(m, func(i, j int) bool {
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iInexact, jInexact := m.fuzzy(m[i]), m.fuzzy(m[j])
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if iInexact && !jInexact {
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return true
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}
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if !iInexact && jInexact {
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return false
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}
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return m[i] < m[j]
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})
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}
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return nil
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}
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// Match returns true if r matches m.
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func (m MatchHost) Match(r *http.Request) bool {
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reqHost, _, err := net.SplitHostPort(r.Host)
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if err != nil {
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// OK; probably didn't have a port
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reqHost = r.Host
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// make sure we strip the brackets from IPv6 addresses
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reqHost = strings.TrimPrefix(reqHost, "[")
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reqHost = strings.TrimSuffix(reqHost, "]")
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}
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if m.large() {
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// fast path: locate exact match using binary search (about 100-1000x faster for large lists)
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pos := sort.Search(len(m), func(i int) bool {
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if m.fuzzy(m[i]) {
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return false
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}
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return m[i] >= reqHost
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})
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if pos < len(m) && m[pos] == reqHost {
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return true
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}
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}
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repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
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outer:
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for _, host := range m {
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// fast path: if matcher is large, we already know we don't have an exact
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// match, so we're only looking for fuzzy match now, which should be at the
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// front of the list; if we have reached a value that is not fuzzy, there
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// will be no match and we can short-circuit for efficiency
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if m.large() && !m.fuzzy(host) {
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break
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}
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host = repl.ReplaceAll(host, "")
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if strings.Contains(host, "*") {
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patternParts := strings.Split(host, ".")
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incomingParts := strings.Split(reqHost, ".")
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if len(patternParts) != len(incomingParts) {
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continue
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}
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for i := range patternParts {
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if patternParts[i] == "*" {
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continue
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}
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if !strings.EqualFold(patternParts[i], incomingParts[i]) {
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continue outer
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}
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}
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return true
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} else if strings.EqualFold(reqHost, host) {
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return true
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}
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}
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return false
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}
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// CELLibrary produces options that expose this matcher for use in CEL
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// expression matchers.
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//
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// Example:
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//
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// expression host('localhost')
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func (MatchHost) CELLibrary(ctx caddy.Context) (cel.Library, error) {
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return CELMatcherImpl(
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"host",
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"host_match_request_list",
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[]*cel.Type{cel.ListType(cel.StringType)},
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func(data ref.Val) (RequestMatcher, error) {
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refStringList := reflect.TypeOf([]string{})
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strList, err := data.ConvertToNative(refStringList)
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if err != nil {
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return nil, err
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}
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matcher := MatchHost(strList.([]string))
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err = matcher.Provision(ctx)
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return matcher, err
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},
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)
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}
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// fuzzy returns true if the given hostname h is not a specific
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// hostname, e.g. has placeholders or wildcards.
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func (MatchHost) fuzzy(h string) bool { return strings.ContainsAny(h, "{*") }
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// large returns true if m is considered to be large. Optimizing
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// the matcher for smaller lists has diminishing returns.
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// See related benchmark function in test file to conduct experiments.
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func (m MatchHost) large() bool { return len(m) > 100 }
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// CaddyModule returns the Caddy module information.
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func (MatchPath) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.matchers.path",
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New: func() caddy.Module { return new(MatchPath) },
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}
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}
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// Provision lower-cases the paths in m to ensure case-insensitive matching.
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func (m MatchPath) Provision(_ caddy.Context) error {
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for i := range m {
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if m[i] == "*" && i > 0 {
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// will always match, so just put it first
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m[0] = m[i]
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break
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}
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m[i] = strings.ToLower(m[i])
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}
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return nil
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}
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// Match returns true if r matches m.
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func (m MatchPath) Match(r *http.Request) bool {
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// Even though RFC 9110 says that path matching is case-sensitive
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// (https://www.rfc-editor.org/rfc/rfc9110.html#section-4.2.3),
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// we do case-insensitive matching to mitigate security issues
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// related to differences between operating systems, applications,
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// etc; if case-sensitive matching is needed, the regex matcher
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// can be used instead.
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reqPath := strings.ToLower(r.URL.Path)
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// See #2917; Windows ignores trailing dots and spaces
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// when accessing files (sigh), potentially causing a
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// security risk (cry) if PHP files end up being served
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// as static files, exposing the source code, instead of
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// being matched by *.php to be treated as PHP scripts.
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reqPath = strings.TrimRight(reqPath, ". ")
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repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
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for _, matchPattern := range m {
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matchPattern = repl.ReplaceAll(matchPattern, "")
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// special case: whole path is wildcard; this is unnecessary
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// as it matches all requests, which is the same as no matcher
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if matchPattern == "*" {
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return true
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}
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// Clean the path, merge doubled slashes, etc.
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// This ensures maliciously crafted requests can't bypass
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// the path matcher. See #4407. Good security posture
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// requires that we should do all we can to reduce any
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// funny-looking paths into "normalized" forms such that
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// weird variants can't sneak by.
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//
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// How we clean the path depends on the kind of pattern:
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// we either merge slashes or we don't. If the pattern
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// has double slashes, we preserve them in the path.
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//
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// TODO: Despite the fact that the *vast* majority of path
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// matchers have only 1 pattern, a possible optimization is
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// to remember the cleaned form of the path for future
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// iterations; it's just that the way we clean depends on
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// the kind of pattern.
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mergeSlashes := !strings.Contains(matchPattern, "//")
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// if '%' appears in the match pattern, we interpret that to mean
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// the intent is to compare that part of the path in raw/escaped
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// space; i.e. "%40"=="%40", not "@", and "%2F"=="%2F", not "/"
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if strings.Contains(matchPattern, "%") {
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reqPathForPattern := CleanPath(r.URL.EscapedPath(), mergeSlashes)
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if m.matchPatternWithEscapeSequence(reqPathForPattern, matchPattern) {
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return true
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}
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// doing prefix/suffix/substring matches doesn't make sense
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continue
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}
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reqPathForPattern := CleanPath(reqPath, mergeSlashes)
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// for substring, prefix, and suffix matching, only perform those
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// special, fast matches if they are the only wildcards in the pattern;
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// otherwise we assume a globular match if any * appears in the middle
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// special case: first and last characters are wildcard,
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// treat it as a fast substring match
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if strings.Count(matchPattern, "*") == 2 &&
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strings.HasPrefix(matchPattern, "*") &&
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strings.HasSuffix(matchPattern, "*") &&
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strings.Count(matchPattern, "*") == 2 {
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if strings.Contains(reqPathForPattern, matchPattern[1:len(matchPattern)-1]) {
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return true
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}
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|
continue
|
|
}
|
|
|
|
// only perform prefix/suffix match if it is the only wildcard...
|
|
// I think that is more correct most of the time
|
|
if strings.Count(matchPattern, "*") == 1 {
|
|
// special case: first character is a wildcard,
|
|
// treat it as a fast suffix match
|
|
if strings.HasPrefix(matchPattern, "*") {
|
|
if strings.HasSuffix(reqPathForPattern, matchPattern[1:]) {
|
|
return true
|
|
}
|
|
continue
|
|
}
|
|
|
|
// special case: last character is a wildcard,
|
|
// treat it as a fast prefix match
|
|
if strings.HasSuffix(matchPattern, "*") {
|
|
if strings.HasPrefix(reqPathForPattern, matchPattern[:len(matchPattern)-1]) {
|
|
return true
|
|
}
|
|
continue
|
|
}
|
|
}
|
|
|
|
// at last, use globular matching, which also is exact matching
|
|
// if there are no glob/wildcard chars; we ignore the error here
|
|
// because we can't handle it anyway
|
|
matches, _ := path.Match(matchPattern, reqPathForPattern)
|
|
if matches {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (MatchPath) matchPatternWithEscapeSequence(escapedPath, matchPath string) bool {
|
|
// We would just compare the pattern against r.URL.Path,
|
|
// but the pattern contains %, indicating that we should
|
|
// compare at least some part of the path in raw/escaped
|
|
// space, not normalized space; so we build the string we
|
|
// will compare against by adding the normalized parts
|
|
// of the path, then switching to the escaped parts where
|
|
// the pattern hints to us wherever % is present.
|
|
var sb strings.Builder
|
|
|
|
// iterate the pattern and escaped path in lock-step;
|
|
// increment iPattern every time we consume a char from the pattern,
|
|
// increment iPath every time we consume a char from the path;
|
|
// iPattern and iPath are our cursors/iterator positions for each string
|
|
var iPattern, iPath int
|
|
for {
|
|
if iPattern >= len(matchPath) || iPath >= len(escapedPath) {
|
|
break
|
|
}
|
|
|
|
// get the next character from the request path
|
|
|
|
pathCh := string(escapedPath[iPath])
|
|
var escapedPathCh string
|
|
|
|
// normalize (decode) escape sequences
|
|
if pathCh == "%" && len(escapedPath) >= iPath+3 {
|
|
// hold onto this in case we find out the intent is to match in escaped space here;
|
|
// we lowercase it even though technically the spec says: "For consistency, URI
|
|
// producers and normalizers should use uppercase hexadecimal digits for all percent-
|
|
// encodings" (RFC 3986 section 2.1) - we lowercased the matcher pattern earlier in
|
|
// provisioning so we do the same here to gain case-insensitivity in equivalence;
|
|
// besides, this string is never shown visibly
|
|
escapedPathCh = strings.ToLower(escapedPath[iPath : iPath+3])
|
|
|
|
var err error
|
|
pathCh, err = url.PathUnescape(escapedPathCh)
|
|
if err != nil {
|
|
// should be impossible unless EscapedPath() is giving us an invalid sequence!
|
|
return false
|
|
}
|
|
iPath += 2 // escape sequence is 2 bytes longer than normal char
|
|
}
|
|
|
|
// now get the next character from the pattern
|
|
|
|
normalize := true
|
|
switch matchPath[iPattern] {
|
|
case '%':
|
|
// escape sequence
|
|
|
|
// if not a wildcard ("%*"), compare literally; consume next two bytes of pattern
|
|
if len(matchPath) >= iPattern+3 && matchPath[iPattern+1] != '*' {
|
|
sb.WriteString(escapedPathCh)
|
|
iPath++
|
|
iPattern += 2
|
|
break
|
|
}
|
|
|
|
// escaped wildcard sequence; consume next byte only ('*')
|
|
iPattern++
|
|
normalize = false
|
|
|
|
fallthrough
|
|
case '*':
|
|
// wildcard, so consume until next matching character
|
|
remaining := escapedPath[iPath:]
|
|
until := len(escapedPath) - iPath // go until end of string...
|
|
if iPattern < len(matchPath)-1 { // ...unless the * is not at the end
|
|
nextCh := matchPath[iPattern+1]
|
|
until = strings.IndexByte(remaining, nextCh)
|
|
if until == -1 {
|
|
// terminating char of wildcard span not found, so definitely no match
|
|
return false
|
|
}
|
|
}
|
|
if until == 0 {
|
|
// empty span; nothing to add on this iteration
|
|
break
|
|
}
|
|
next := remaining[:until]
|
|
if normalize {
|
|
var err error
|
|
next, err = url.PathUnescape(next)
|
|
if err != nil {
|
|
return false // should be impossible anyway
|
|
}
|
|
}
|
|
sb.WriteString(next)
|
|
iPath += until
|
|
default:
|
|
sb.WriteString(pathCh)
|
|
iPath++
|
|
}
|
|
|
|
iPattern++
|
|
}
|
|
|
|
// we can now treat rawpath globs (%*) as regular globs (*)
|
|
matchPath = strings.ReplaceAll(matchPath, "%*", "*")
|
|
|
|
// ignore error here because we can't handle it anyway=
|
|
matches, _ := path.Match(matchPath, sb.String())
|
|
return matches
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression path('*substring*', '*suffix')
|
|
func (MatchPath) CELLibrary(ctx caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
// name of the macro, this is the function name that users see when writing expressions.
|
|
"path",
|
|
// name of the function that the macro will be rewritten to call.
|
|
"path_match_request_list",
|
|
// internal data type of the MatchPath value.
|
|
[]*cel.Type{cel.ListType(cel.StringType)},
|
|
// function to convert a constant list of strings to a MatchPath instance.
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
strList, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
matcher := MatchPath(strList.([]string))
|
|
err = matcher.Provision(ctx)
|
|
return matcher, err
|
|
},
|
|
)
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchPath) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
*m = append(*m, d.RemainingArgs()...)
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed path matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchPathRE) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.path_regexp",
|
|
New: func() caddy.Module { return new(MatchPathRE) },
|
|
}
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchPathRE) Match(r *http.Request) bool {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
|
|
// Clean the path, merges doubled slashes, etc.
|
|
// This ensures maliciously crafted requests can't bypass
|
|
// the path matcher. See #4407
|
|
cleanedPath := cleanPath(r.URL.Path)
|
|
|
|
return m.MatchRegexp.Match(cleanedPath, repl)
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression path_regexp('^/bar')
|
|
func (MatchPathRE) CELLibrary(ctx caddy.Context) (cel.Library, error) {
|
|
unnamedPattern, err := CELMatcherImpl(
|
|
"path_regexp",
|
|
"path_regexp_request_string",
|
|
[]*cel.Type{cel.StringType},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
pattern := data.(types.String)
|
|
matcher := MatchPathRE{MatchRegexp{Pattern: string(pattern)}}
|
|
err := matcher.Provision(ctx)
|
|
return matcher, err
|
|
},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
namedPattern, err := CELMatcherImpl(
|
|
"path_regexp",
|
|
"path_regexp_request_string_string",
|
|
[]*cel.Type{cel.StringType, cel.StringType},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
params, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
strParams := params.([]string)
|
|
matcher := MatchPathRE{MatchRegexp{Name: strParams[0], Pattern: strParams[1]}}
|
|
err = matcher.Provision(ctx)
|
|
return matcher, err
|
|
},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
envOpts := append(unnamedPattern.CompileOptions(), namedPattern.CompileOptions()...)
|
|
prgOpts := append(unnamedPattern.ProgramOptions(), namedPattern.ProgramOptions()...)
|
|
return NewMatcherCELLibrary(envOpts, prgOpts), nil
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchMethod) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.method",
|
|
New: func() caddy.Module { return new(MatchMethod) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchMethod) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
*m = append(*m, d.RemainingArgs()...)
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed method matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchMethod) Match(r *http.Request) bool {
|
|
for _, method := range m {
|
|
if r.Method == method {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression method('PUT', 'POST')
|
|
func (MatchMethod) CELLibrary(_ caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
"method",
|
|
"method_request_list",
|
|
[]*cel.Type{cel.ListType(cel.StringType)},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
strList, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return MatchMethod(strList.([]string)), nil
|
|
},
|
|
)
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchQuery) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.query",
|
|
New: func() caddy.Module { return new(MatchQuery) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchQuery) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
if *m == nil {
|
|
*m = make(map[string][]string)
|
|
}
|
|
for d.Next() {
|
|
for _, query := range d.RemainingArgs() {
|
|
if query == "" {
|
|
continue
|
|
}
|
|
before, after, found := strings.Cut(query, "=")
|
|
if !found {
|
|
return d.Errf("malformed query matcher token: %s; must be in param=val format", d.Val())
|
|
}
|
|
url.Values(*m).Add(before, after)
|
|
}
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed query matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if r matches m. An empty m matches an empty query string.
|
|
func (m MatchQuery) Match(r *http.Request) bool {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
|
|
// parse query string just once, for efficiency
|
|
parsed, err := url.ParseQuery(r.URL.RawQuery)
|
|
if err != nil {
|
|
// Illegal query string. Likely bad escape sequence or unescaped literals.
|
|
// Note that semicolons in query string have a controversial history. Summaries:
|
|
// - https://github.com/golang/go/issues/50034
|
|
// - https://github.com/golang/go/issues/25192
|
|
// Despite the URL WHATWG spec mandating the use of & separators for query strings,
|
|
// every URL parser implementation is different, and Filippo Valsorda rightly wrote:
|
|
// "Relying on parser alignment for security is doomed." Overall conclusion is that
|
|
// splitting on & and rejecting ; in key=value pairs is safer than accepting raw ;.
|
|
// We regard the Go team's decision as sound and thus reject malformed query strings.
|
|
return false
|
|
}
|
|
|
|
for param, vals := range m {
|
|
param = repl.ReplaceAll(param, "")
|
|
paramVal, found := parsed[param]
|
|
if found {
|
|
for _, v := range vals {
|
|
v = repl.ReplaceAll(v, "")
|
|
if paramVal[0] == v || v == "*" {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return len(m) == 0 && len(r.URL.Query()) == 0
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression query({'sort': 'asc'}) || query({'foo': ['*bar*', 'baz']})
|
|
func (MatchQuery) CELLibrary(_ caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
"query",
|
|
"query_matcher_request_map",
|
|
[]*cel.Type{CELTypeJSON},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
mapStrListStr, err := CELValueToMapStrList(data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return MatchQuery(url.Values(mapStrListStr)), nil
|
|
},
|
|
)
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchHeader) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.header",
|
|
New: func() caddy.Module { return new(MatchHeader) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchHeader) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
if *m == nil {
|
|
*m = make(map[string][]string)
|
|
}
|
|
for d.Next() {
|
|
var field, val string
|
|
if !d.Args(&field) {
|
|
return d.Errf("malformed header matcher: expected field")
|
|
}
|
|
|
|
if strings.HasPrefix(field, "!") {
|
|
if len(field) == 1 {
|
|
return d.Errf("malformed header matcher: must have field name following ! character")
|
|
}
|
|
|
|
field = field[1:]
|
|
headers := *m
|
|
headers[field] = nil
|
|
m = &headers
|
|
if d.NextArg() {
|
|
return d.Errf("malformed header matcher: null matching headers cannot have a field value")
|
|
}
|
|
} else {
|
|
if !d.NextArg() {
|
|
return d.Errf("malformed header matcher: expected both field and value")
|
|
}
|
|
|
|
// If multiple header matchers with the same header field are defined,
|
|
// we want to add the existing to the list of headers (will be OR'ed)
|
|
val = d.Val()
|
|
http.Header(*m).Add(field, val)
|
|
}
|
|
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed header matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchHeader) Match(r *http.Request) bool {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
return matchHeaders(r.Header, http.Header(m), r.Host, repl)
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression header({'content-type': 'image/png'})
|
|
// expression header({'foo': ['bar', 'baz']}) // match bar or baz
|
|
func (MatchHeader) CELLibrary(_ caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
"header",
|
|
"header_matcher_request_map",
|
|
[]*cel.Type{CELTypeJSON},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
mapStrListStr, err := CELValueToMapStrList(data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return MatchHeader(http.Header(mapStrListStr)), nil
|
|
},
|
|
)
|
|
}
|
|
|
|
// getHeaderFieldVals returns the field values for the given fieldName from input.
|
|
// The host parameter should be obtained from the http.Request.Host field since
|
|
// net/http removes it from the header map.
|
|
func getHeaderFieldVals(input http.Header, fieldName, host string) []string {
|
|
fieldName = textproto.CanonicalMIMEHeaderKey(fieldName)
|
|
if fieldName == "Host" && host != "" {
|
|
return []string{host}
|
|
}
|
|
return input[fieldName]
|
|
}
|
|
|
|
// matchHeaders returns true if input matches the criteria in against without regex.
|
|
// The host parameter should be obtained from the http.Request.Host field since
|
|
// net/http removes it from the header map.
|
|
func matchHeaders(input, against http.Header, host string, repl *caddy.Replacer) bool {
|
|
for field, allowedFieldVals := range against {
|
|
actualFieldVals := getHeaderFieldVals(input, field, host)
|
|
if allowedFieldVals != nil && len(allowedFieldVals) == 0 && actualFieldVals != nil {
|
|
// a non-nil but empty list of allowed values means
|
|
// match if the header field exists at all
|
|
continue
|
|
}
|
|
if allowedFieldVals == nil && actualFieldVals == nil {
|
|
// a nil list means match if the header does not exist at all
|
|
continue
|
|
}
|
|
var match bool
|
|
fieldVals:
|
|
for _, actualFieldVal := range actualFieldVals {
|
|
for _, allowedFieldVal := range allowedFieldVals {
|
|
if repl != nil {
|
|
allowedFieldVal = repl.ReplaceAll(allowedFieldVal, "")
|
|
}
|
|
switch {
|
|
case allowedFieldVal == "*":
|
|
match = true
|
|
case strings.HasPrefix(allowedFieldVal, "*") && strings.HasSuffix(allowedFieldVal, "*"):
|
|
match = strings.Contains(actualFieldVal, allowedFieldVal[1:len(allowedFieldVal)-1])
|
|
case strings.HasPrefix(allowedFieldVal, "*"):
|
|
match = strings.HasSuffix(actualFieldVal, allowedFieldVal[1:])
|
|
case strings.HasSuffix(allowedFieldVal, "*"):
|
|
match = strings.HasPrefix(actualFieldVal, allowedFieldVal[:len(allowedFieldVal)-1])
|
|
default:
|
|
match = actualFieldVal == allowedFieldVal
|
|
}
|
|
if match {
|
|
break fieldVals
|
|
}
|
|
}
|
|
}
|
|
if !match {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchHeaderRE) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.header_regexp",
|
|
New: func() caddy.Module { return new(MatchHeaderRE) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchHeaderRE) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
if *m == nil {
|
|
*m = make(map[string]*MatchRegexp)
|
|
}
|
|
for d.Next() {
|
|
var first, second, third string
|
|
if !d.Args(&first, &second) {
|
|
return d.ArgErr()
|
|
}
|
|
|
|
var name, field, val string
|
|
if d.Args(&third) {
|
|
name = first
|
|
field = second
|
|
val = third
|
|
} else {
|
|
field = first
|
|
val = second
|
|
}
|
|
|
|
// If there's already a pattern for this field
|
|
// then we would end up overwriting the old one
|
|
if (*m)[field] != nil {
|
|
return d.Errf("header_regexp matcher can only be used once per named matcher, per header field: %s", field)
|
|
}
|
|
|
|
(*m)[field] = &MatchRegexp{Pattern: val, Name: name}
|
|
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed header_regexp matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchHeaderRE) Match(r *http.Request) bool {
|
|
for field, rm := range m {
|
|
actualFieldVals := getHeaderFieldVals(r.Header, field, r.Host)
|
|
match := false
|
|
fieldVal:
|
|
for _, actualFieldVal := range actualFieldVals {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
if rm.Match(actualFieldVal, repl) {
|
|
match = true
|
|
break fieldVal
|
|
}
|
|
}
|
|
if !match {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Provision compiles m's regular expressions.
|
|
func (m MatchHeaderRE) Provision(ctx caddy.Context) error {
|
|
for _, rm := range m {
|
|
err := rm.Provision(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Validate validates m's regular expressions.
|
|
func (m MatchHeaderRE) Validate() error {
|
|
for _, rm := range m {
|
|
err := rm.Validate()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression header_regexp('foo', 'Field', 'fo+')
|
|
func (MatchHeaderRE) CELLibrary(ctx caddy.Context) (cel.Library, error) {
|
|
unnamedPattern, err := CELMatcherImpl(
|
|
"header_regexp",
|
|
"header_regexp_request_string_string",
|
|
[]*cel.Type{cel.StringType, cel.StringType},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
params, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
strParams := params.([]string)
|
|
matcher := MatchHeaderRE{}
|
|
matcher[strParams[0]] = &MatchRegexp{Pattern: strParams[1], Name: ""}
|
|
err = matcher.Provision(ctx)
|
|
return matcher, err
|
|
},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
namedPattern, err := CELMatcherImpl(
|
|
"header_regexp",
|
|
"header_regexp_request_string_string_string",
|
|
[]*cel.Type{cel.StringType, cel.StringType, cel.StringType},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
params, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
strParams := params.([]string)
|
|
matcher := MatchHeaderRE{}
|
|
matcher[strParams[1]] = &MatchRegexp{Pattern: strParams[2], Name: strParams[0]}
|
|
err = matcher.Provision(ctx)
|
|
return matcher, err
|
|
},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
envOpts := append(unnamedPattern.CompileOptions(), namedPattern.CompileOptions()...)
|
|
prgOpts := append(unnamedPattern.ProgramOptions(), namedPattern.ProgramOptions()...)
|
|
return NewMatcherCELLibrary(envOpts, prgOpts), nil
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchProtocol) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.protocol",
|
|
New: func() caddy.Module { return new(MatchProtocol) },
|
|
}
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchProtocol) Match(r *http.Request) bool {
|
|
switch string(m) {
|
|
case "grpc":
|
|
return strings.HasPrefix(r.Header.Get("content-type"), "application/grpc")
|
|
case "https":
|
|
return r.TLS != nil
|
|
case "http":
|
|
return r.TLS == nil
|
|
case "http/1.0":
|
|
return r.ProtoMajor == 1 && r.ProtoMinor == 0
|
|
case "http/1.0+":
|
|
return r.ProtoAtLeast(1, 0)
|
|
case "http/1.1":
|
|
return r.ProtoMajor == 1 && r.ProtoMinor == 1
|
|
case "http/1.1+":
|
|
return r.ProtoAtLeast(1, 1)
|
|
case "http/2":
|
|
return r.ProtoMajor == 2
|
|
case "http/2+":
|
|
return r.ProtoAtLeast(2, 0)
|
|
case "http/3":
|
|
return r.ProtoMajor == 3
|
|
case "http/3+":
|
|
return r.ProtoAtLeast(3, 0)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchProtocol) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
var proto string
|
|
if !d.Args(&proto) {
|
|
return d.Err("expected exactly one protocol")
|
|
}
|
|
*m = MatchProtocol(proto)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression protocol('https')
|
|
func (MatchProtocol) CELLibrary(_ caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
"protocol",
|
|
"protocol_request_string",
|
|
[]*cel.Type{cel.StringType},
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
protocolStr, ok := data.(types.String)
|
|
if !ok {
|
|
return nil, errors.New("protocol argument was not a string")
|
|
}
|
|
return MatchProtocol(strings.ToLower(string(protocolStr))), nil
|
|
},
|
|
)
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchNot) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.not",
|
|
New: func() caddy.Module { return new(MatchNot) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchNot) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
matcherSet, err := ParseCaddyfileNestedMatcherSet(d)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
m.MatcherSetsRaw = append(m.MatcherSetsRaw, matcherSet)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// UnmarshalJSON satisfies json.Unmarshaler. It puts the JSON
|
|
// bytes directly into m's MatcherSetsRaw field.
|
|
func (m *MatchNot) UnmarshalJSON(data []byte) error {
|
|
return json.Unmarshal(data, &m.MatcherSetsRaw)
|
|
}
|
|
|
|
// MarshalJSON satisfies json.Marshaler by marshaling
|
|
// m's raw matcher sets.
|
|
func (m MatchNot) MarshalJSON() ([]byte, error) {
|
|
return json.Marshal(m.MatcherSetsRaw)
|
|
}
|
|
|
|
// Provision loads the matcher modules to be negated.
|
|
func (m *MatchNot) Provision(ctx caddy.Context) error {
|
|
matcherSets, err := ctx.LoadModule(m, "MatcherSetsRaw")
|
|
if err != nil {
|
|
return fmt.Errorf("loading matcher sets: %v", err)
|
|
}
|
|
for _, modMap := range matcherSets.([]map[string]any) {
|
|
var ms MatcherSet
|
|
for _, modIface := range modMap {
|
|
ms = append(ms, modIface.(RequestMatcher))
|
|
}
|
|
m.MatcherSets = append(m.MatcherSets, ms)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if r matches m. Since this matcher negates
|
|
// the embedded matchers, false is returned if any of its matcher
|
|
// sets return true.
|
|
func (m MatchNot) Match(r *http.Request) bool {
|
|
for _, ms := range m.MatcherSets {
|
|
if ms.Match(r) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (MatchRemoteIP) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.matchers.remote_ip",
|
|
New: func() caddy.Module { return new(MatchRemoteIP) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (m *MatchRemoteIP) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
for d.NextArg() {
|
|
if d.Val() == "forwarded" {
|
|
if len(m.Ranges) > 0 {
|
|
return d.Err("if used, 'forwarded' must be first argument")
|
|
}
|
|
m.Forwarded = true
|
|
continue
|
|
}
|
|
if d.Val() == "private_ranges" {
|
|
m.Ranges = append(m.Ranges, []string{
|
|
"192.168.0.0/16",
|
|
"172.16.0.0/12",
|
|
"10.0.0.0/8",
|
|
"127.0.0.1/8",
|
|
"fd00::/8",
|
|
"::1",
|
|
}...)
|
|
continue
|
|
}
|
|
m.Ranges = append(m.Ranges, d.Val())
|
|
}
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed remote_ip matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CELLibrary produces options that expose this matcher for use in CEL
|
|
// expression matchers.
|
|
//
|
|
// Example:
|
|
//
|
|
// expression remote_ip('forwarded', '192.168.0.0/16', '172.16.0.0/12', '10.0.0.0/8')
|
|
func (MatchRemoteIP) CELLibrary(ctx caddy.Context) (cel.Library, error) {
|
|
return CELMatcherImpl(
|
|
// name of the macro, this is the function name that users see when writing expressions.
|
|
"remote_ip",
|
|
// name of the function that the macro will be rewritten to call.
|
|
"remote_ip_match_request_list",
|
|
// internal data type of the MatchPath value.
|
|
[]*cel.Type{cel.ListType(cel.StringType)},
|
|
// function to convert a constant list of strings to a MatchPath instance.
|
|
func(data ref.Val) (RequestMatcher, error) {
|
|
refStringList := reflect.TypeOf([]string{})
|
|
strList, err := data.ConvertToNative(refStringList)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
m := MatchRemoteIP{}
|
|
|
|
for _, input := range strList.([]string) {
|
|
if input == "forwarded" {
|
|
if len(m.Ranges) > 0 {
|
|
return nil, errors.New("if used, 'forwarded' must be first argument")
|
|
}
|
|
m.Forwarded = true
|
|
continue
|
|
}
|
|
m.Ranges = append(m.Ranges, input)
|
|
}
|
|
|
|
err = m.Provision(ctx)
|
|
return m, err
|
|
},
|
|
)
|
|
}
|
|
|
|
// Provision parses m's IP ranges, either from IP or CIDR expressions.
|
|
func (m *MatchRemoteIP) Provision(ctx caddy.Context) error {
|
|
m.logger = ctx.Logger()
|
|
for _, str := range m.Ranges {
|
|
// Exclude the zone_id from the IP
|
|
if strings.Contains(str, "%") {
|
|
split := strings.Split(str, "%")
|
|
str = split[0]
|
|
// write zone identifiers in m.zones for matching later
|
|
m.zones = append(m.zones, split[1])
|
|
} else {
|
|
m.zones = append(m.zones, "")
|
|
}
|
|
if strings.Contains(str, "/") {
|
|
ipNet, err := netip.ParsePrefix(str)
|
|
if err != nil {
|
|
return fmt.Errorf("parsing CIDR expression '%s': %v", str, err)
|
|
}
|
|
m.cidrs = append(m.cidrs, &ipNet)
|
|
} else {
|
|
ipAddr, err := netip.ParseAddr(str)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid IP address: '%s': %v", str, err)
|
|
}
|
|
ipNew := netip.PrefixFrom(ipAddr, ipAddr.BitLen())
|
|
m.cidrs = append(m.cidrs, &ipNew)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (m MatchRemoteIP) getClientIP(r *http.Request) (netip.Addr, string, error) {
|
|
remote := r.RemoteAddr
|
|
zoneID := ""
|
|
if m.Forwarded {
|
|
if fwdFor := r.Header.Get("X-Forwarded-For"); fwdFor != "" {
|
|
remote = strings.TrimSpace(strings.Split(fwdFor, ",")[0])
|
|
}
|
|
}
|
|
ipStr, _, err := net.SplitHostPort(remote)
|
|
if err != nil {
|
|
ipStr = remote // OK; probably didn't have a port
|
|
}
|
|
// Some IPv6-Adresses can contain zone identifiers at the end,
|
|
// which are separated with "%"
|
|
if strings.Contains(ipStr, "%") {
|
|
split := strings.Split(ipStr, "%")
|
|
ipStr = split[0]
|
|
zoneID = split[1]
|
|
}
|
|
ipAddr, err := netip.ParseAddr(ipStr)
|
|
if err != nil {
|
|
return netip.IPv4Unspecified(), "", err
|
|
}
|
|
return ipAddr, zoneID, nil
|
|
}
|
|
|
|
// Match returns true if r matches m.
|
|
func (m MatchRemoteIP) Match(r *http.Request) bool {
|
|
clientIP, zoneID, err := m.getClientIP(r)
|
|
if err != nil {
|
|
m.logger.Error("getting client IP", zap.Error(err))
|
|
return false
|
|
}
|
|
zoneFilter := true
|
|
for i, ipRange := range m.cidrs {
|
|
if ipRange.Contains(clientIP) {
|
|
// Check if there are zone filters assigned and if they match.
|
|
if m.zones[i] == "" || zoneID == m.zones[i] {
|
|
return true
|
|
}
|
|
zoneFilter = false
|
|
}
|
|
}
|
|
if !zoneFilter {
|
|
m.logger.Debug("zone ID from remote did not match", zap.String("zone", zoneID))
|
|
}
|
|
return false
|
|
}
|
|
|
|
// MatchRegexp is an embedable type for matching
|
|
// using regular expressions. It adds placeholders
|
|
// to the request's replacer.
|
|
type MatchRegexp struct {
|
|
// A unique name for this regular expression. Optional,
|
|
// but useful to prevent overwriting captures from other
|
|
// regexp matchers.
|
|
Name string `json:"name,omitempty"`
|
|
|
|
// The regular expression to evaluate, in RE2 syntax,
|
|
// which is the same general syntax used by Go, Perl,
|
|
// and Python. For details, see
|
|
// [Go's regexp package](https://golang.org/pkg/regexp/).
|
|
// Captures are accessible via placeholders. Unnamed
|
|
// capture groups are exposed as their numeric, 1-based
|
|
// index, while named capture groups are available by
|
|
// the capture group name.
|
|
Pattern string `json:"pattern"`
|
|
|
|
compiled *regexp.Regexp
|
|
phPrefix string
|
|
}
|
|
|
|
// Provision compiles the regular expression.
|
|
func (mre *MatchRegexp) Provision(caddy.Context) error {
|
|
re, err := regexp.Compile(mre.Pattern)
|
|
if err != nil {
|
|
return fmt.Errorf("compiling matcher regexp %s: %v", mre.Pattern, err)
|
|
}
|
|
mre.compiled = re
|
|
mre.phPrefix = regexpPlaceholderPrefix
|
|
if mre.Name != "" {
|
|
mre.phPrefix += "." + mre.Name
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Validate ensures mre is set up correctly.
|
|
func (mre *MatchRegexp) Validate() error {
|
|
if mre.Name != "" && !wordRE.MatchString(mre.Name) {
|
|
return fmt.Errorf("invalid regexp name (must contain only word characters): %s", mre.Name)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Match returns true if input matches the compiled regular
|
|
// expression in mre. It sets values on the replacer repl
|
|
// associated with capture groups, using the given scope
|
|
// (namespace).
|
|
func (mre *MatchRegexp) Match(input string, repl *caddy.Replacer) bool {
|
|
matches := mre.compiled.FindStringSubmatch(input)
|
|
if matches == nil {
|
|
return false
|
|
}
|
|
|
|
// save all capture groups, first by index
|
|
for i, match := range matches {
|
|
key := mre.phPrefix + "." + strconv.Itoa(i)
|
|
repl.Set(key, match)
|
|
}
|
|
|
|
// then by name
|
|
for i, name := range mre.compiled.SubexpNames() {
|
|
if i != 0 && name != "" {
|
|
key := mre.phPrefix + "." + name
|
|
repl.Set(key, matches[i])
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
|
|
func (mre *MatchRegexp) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
// If this is the second iteration of the loop
|
|
// then there's more than one path_regexp matcher
|
|
// and we would end up overwriting the old one
|
|
if mre.Pattern != "" {
|
|
return d.Err("regular expression can only be used once per named matcher")
|
|
}
|
|
|
|
args := d.RemainingArgs()
|
|
switch len(args) {
|
|
case 1:
|
|
mre.Pattern = args[0]
|
|
case 2:
|
|
mre.Name = args[0]
|
|
mre.Pattern = args[1]
|
|
default:
|
|
return d.ArgErr()
|
|
}
|
|
if d.NextBlock(0) {
|
|
return d.Err("malformed path_regexp matcher: blocks are not supported")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ParseCaddyfileNestedMatcher parses the Caddyfile tokens for a nested
|
|
// matcher set, and returns its raw module map value.
|
|
func ParseCaddyfileNestedMatcherSet(d *caddyfile.Dispenser) (caddy.ModuleMap, error) {
|
|
matcherMap := make(map[string]RequestMatcher)
|
|
|
|
// in case there are multiple instances of the same matcher, concatenate
|
|
// their tokens (we expect that UnmarshalCaddyfile should be able to
|
|
// handle more than one segment); otherwise, we'd overwrite other
|
|
// instances of the matcher in this set
|
|
tokensByMatcherName := make(map[string][]caddyfile.Token)
|
|
for nesting := d.Nesting(); d.NextArg() || d.NextBlock(nesting); {
|
|
matcherName := d.Val()
|
|
tokensByMatcherName[matcherName] = append(tokensByMatcherName[matcherName], d.NextSegment()...)
|
|
}
|
|
|
|
for matcherName, tokens := range tokensByMatcherName {
|
|
mod, err := caddy.GetModule("http.matchers." + matcherName)
|
|
if err != nil {
|
|
return nil, d.Errf("getting matcher module '%s': %v", matcherName, err)
|
|
}
|
|
unm, ok := mod.New().(caddyfile.Unmarshaler)
|
|
if !ok {
|
|
return nil, d.Errf("matcher module '%s' is not a Caddyfile unmarshaler", matcherName)
|
|
}
|
|
err = unm.UnmarshalCaddyfile(caddyfile.NewDispenser(tokens))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rm, ok := unm.(RequestMatcher)
|
|
if !ok {
|
|
return nil, fmt.Errorf("matcher module '%s' is not a request matcher", matcherName)
|
|
}
|
|
matcherMap[matcherName] = rm
|
|
}
|
|
|
|
// we should now have a functional matcher, but we also
|
|
// need to be able to marshal as JSON, otherwise config
|
|
// adaptation will be missing the matchers!
|
|
matcherSet := make(caddy.ModuleMap)
|
|
for name, matcher := range matcherMap {
|
|
jsonBytes, err := json.Marshal(matcher)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("marshaling %T matcher: %v", matcher, err)
|
|
}
|
|
matcherSet[name] = jsonBytes
|
|
}
|
|
|
|
return matcherSet, nil
|
|
}
|
|
|
|
var (
|
|
wordRE = regexp.MustCompile(`\w+`)
|
|
)
|
|
|
|
const regexpPlaceholderPrefix = "http.regexp"
|
|
|
|
// MatcherErrorVarKey is the key used for the variable that
|
|
// holds an optional error emitted from a request matcher,
|
|
// to short-circuit the handler chain, since matchers cannot
|
|
// return errors via the RequestMatcher interface.
|
|
const MatcherErrorVarKey = "matchers.error"
|
|
|
|
// Interface guards
|
|
var (
|
|
_ RequestMatcher = (*MatchHost)(nil)
|
|
_ caddy.Provisioner = (*MatchHost)(nil)
|
|
_ RequestMatcher = (*MatchPath)(nil)
|
|
_ RequestMatcher = (*MatchPathRE)(nil)
|
|
_ caddy.Provisioner = (*MatchPathRE)(nil)
|
|
_ RequestMatcher = (*MatchMethod)(nil)
|
|
_ RequestMatcher = (*MatchQuery)(nil)
|
|
_ RequestMatcher = (*MatchHeader)(nil)
|
|
_ RequestMatcher = (*MatchHeaderRE)(nil)
|
|
_ caddy.Provisioner = (*MatchHeaderRE)(nil)
|
|
_ RequestMatcher = (*MatchProtocol)(nil)
|
|
_ RequestMatcher = (*MatchRemoteIP)(nil)
|
|
_ caddy.Provisioner = (*MatchRemoteIP)(nil)
|
|
_ RequestMatcher = (*MatchNot)(nil)
|
|
_ caddy.Provisioner = (*MatchNot)(nil)
|
|
_ caddy.Provisioner = (*MatchRegexp)(nil)
|
|
|
|
_ caddyfile.Unmarshaler = (*MatchHost)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchPath)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchPathRE)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchMethod)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchQuery)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchHeader)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchHeaderRE)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchProtocol)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchRemoteIP)(nil)
|
|
_ caddyfile.Unmarshaler = (*VarsMatcher)(nil)
|
|
_ caddyfile.Unmarshaler = (*MatchVarsRE)(nil)
|
|
|
|
_ CELLibraryProducer = (*MatchHost)(nil)
|
|
_ CELLibraryProducer = (*MatchPath)(nil)
|
|
_ CELLibraryProducer = (*MatchPathRE)(nil)
|
|
_ CELLibraryProducer = (*MatchMethod)(nil)
|
|
_ CELLibraryProducer = (*MatchQuery)(nil)
|
|
_ CELLibraryProducer = (*MatchHeader)(nil)
|
|
_ CELLibraryProducer = (*MatchHeaderRE)(nil)
|
|
_ CELLibraryProducer = (*MatchProtocol)(nil)
|
|
_ CELLibraryProducer = (*MatchRemoteIP)(nil)
|
|
// _ CELLibraryProducer = (*VarsMatcher)(nil)
|
|
// _ CELLibraryProducer = (*MatchVarsRE)(nil)
|
|
|
|
_ json.Marshaler = (*MatchNot)(nil)
|
|
_ json.Unmarshaler = (*MatchNot)(nil)
|
|
)
|