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Allow IP identifiers in subject, including authorization enforcement

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To support IPs in the subject using `step-cli`, this PR ensures that
Subject Common Names that can be parsed as an IP are also checked
to have been authorized before.

The PR for `step-cli` is here: github.com/smallstep/cli/pull/576.
This commit is contained in:
Herman Slatman 2021-12-13 15:30:20 +01:00
parent 78acf35bf4
commit a2c9b5cd7e
No known key found for this signature in database
GPG key ID: F4D8A44EA0A75A4F
2 changed files with 85 additions and 29 deletions
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22
acme/order.go
View file

@ -277,7 +277,9 @@ func numberOfIdentifierType(typ IdentifierType, ids []Identifier) int {
// canonicalize canonicalizes a CSR so that it can be compared against an Order
// NOTE: this effectively changes the order of SANs in the CSR, which may be OK,
// but may not be expected.
// but may not be expected. It also adds a Subject Common Name to either the IP
// addresses or DNS names slice, depending on whether it can be parsed as an IP
// or not. This might result in an additional SAN in the final certificate.
func canonicalize(csr *x509.CertificateRequest) (canonicalized *x509.CertificateRequest) {
// for clarity only; we're operating on the same object by pointer
@ -287,11 +289,20 @@ func canonicalize(csr *x509.CertificateRequest) (canonicalized *x509.Certificate
// identifiers as the initial newOrder request. Identifiers of type "dns"
// MUST appear either in the commonName portion of the requested subject
// name or in an extensionRequest attribute [RFC2985] requesting a
// subjectAltName extension, or both.
// subjectAltName extension, or both. Subject Common Names that can be
// parsed as an IP are included as an IP address for the equality check.
// If these were excluded, a certificate could contain an IP as the
// common name without having been challenged.
if csr.Subject.CommonName != "" {
// nolint:gocritic
ip := net.ParseIP(csr.Subject.CommonName)
subjectIsIP := ip != nil
if subjectIsIP {
canonicalized.IPAddresses = append(csr.IPAddresses, ip)
} else {
canonicalized.DNSNames = append(csr.DNSNames, csr.Subject.CommonName)
}
}
canonicalized.DNSNames = uniqueSortedLowerNames(csr.DNSNames)
canonicalized.IPAddresses = uniqueSortedIPs(csr.IPAddresses)
@ -335,7 +346,10 @@ func uniqueSortedIPs(ips []net.IP) (unique []net.IP) {
}
ipEntryMap := make(map[string]entry, len(ips))
for _, ip := range ips {
ipEntryMap[ip.String()] = entry{ip: ip}
// reparsing the IP results in the IP being represented using 16 bytes
// for both IPv4 as well as IPv6, even when the ips slice contains IPs that
// are represented by 4 bytes. This ensures a fair comparison and thus ordering.
ipEntryMap[ip.String()] = entry{ip: net.ParseIP(ip.String())}
}
unique = make([]net.IP, 0, len(ipEntryMap))
for _, entry := range ipEntryMap {

82
acme/order_test.go
View file

@ -10,6 +10,7 @@ import (
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/pkg/errors"
"github.com/smallstep/assert"
"github.com/smallstep/certificates/authority/provisioner"
@ -818,69 +819,90 @@ func Test_uniqueSortedIPs(t *testing.T) {
tests := []struct {
name string
args args
wantUnique []net.IP
want []net.IP
}{
{
name: "ok/empty",
args: args{
ips: []net.IP{},
},
wantUnique: []net.IP{},
want: []net.IP{},
},
{
name: "ok/single-ipv4",
args: args{
ips: []net.IP{net.ParseIP("192.168.42.42")},
},
wantUnique: []net.IP{net.ParseIP("192.168.42.42")},
want: []net.IP{net.ParseIP("192.168.42.42")},
},
{
name: "ok/multiple-ipv4",
args: args{
ips: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.1")},
ips: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.1"), net.ParseIP("127.0.0.1")},
},
wantUnique: []net.IP{net.ParseIP("192.168.42.1"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.42")},
want: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("192.168.42.1"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.42")},
}, {
name: "ok/multiple-ipv4-with-varying-byte-representations",
args: args{
ips: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.1"), []byte{0x7f, 0x0, 0x0, 0x1}},
},
want: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("192.168.42.1"), net.ParseIP("192.168.42.10"), net.ParseIP("192.168.42.42")},
},
{
name: "ok/unique-ipv4",
args: args{
ips: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.42")},
},
wantUnique: []net.IP{net.ParseIP("192.168.42.42")},
want: []net.IP{net.ParseIP("192.168.42.42")},
},
{
name: "ok/single-ipv6",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::30")},
},
wantUnique: []net.IP{net.ParseIP("2001:db8::30")},
want: []net.IP{net.ParseIP("2001:db8::30")},
},
{
name: "ok/multiple-ipv6",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::30"), net.ParseIP("2001:db8::20"), net.ParseIP("2001:db8::10")},
},
wantUnique: []net.IP{net.ParseIP("2001:db8::10"), net.ParseIP("2001:db8::20"), net.ParseIP("2001:db8::30")},
want: []net.IP{net.ParseIP("2001:db8::10"), net.ParseIP("2001:db8::20"), net.ParseIP("2001:db8::30")},
},
{
name: "ok/unique-ipv6",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::1")},
},
wantUnique: []net.IP{net.ParseIP("2001:db8::1")},
want: []net.IP{net.ParseIP("2001:db8::1")},
},
{
name: "ok/mixed-ipv4-and-ipv6",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::1"), net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.42")},
},
wantUnique: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("2001:db8::1")},
want: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("2001:db8::1")},
},
{
name: "ok/mixed-ipv4-and-ipv6-and-varying-byte-representations",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::1"), net.ParseIP("192.168.42.42"), net.ParseIP("192.168.42.42"), []byte{0x7f, 0x0, 0x0, 0x1}},
},
want: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("192.168.42.42"), net.ParseIP("2001:db8::1")},
},
{
name: "ok/mixed-ipv4-and-ipv6-and-more-varying-byte-representations",
args: args{
ips: []net.IP{net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::1"), net.ParseIP("192.168.42.42"), net.ParseIP("2001:db8::2"), net.ParseIP("192.168.42.42"), []byte{0x7f, 0x0, 0x0, 0x1}, []byte{0x7f, 0x0, 0x0, 0x1}, []byte{0x7f, 0x0, 0x0, 0x2}},
},
want: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("127.0.0.2"), net.ParseIP("192.168.42.42"), net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::2")},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if gotUnique := uniqueSortedIPs(tt.args.ips); !reflect.DeepEqual(gotUnique, tt.wantUnique) {
t.Errorf("uniqueSortedIPs() = %v, want %v", gotUnique, tt.wantUnique)
got := uniqueSortedIPs(tt.args.ips)
if !cmp.Equal(tt.want, got) {
t.Errorf("uniqueSortedIPs() diff =\n%s", cmp.Diff(tt.want, got))
}
})
}
@ -1115,7 +1137,7 @@ func Test_canonicalize(t *testing.T) {
tests := []struct {
name string
args args
wantCanonicalized *x509.CertificateRequest
want *x509.CertificateRequest
}{
{
name: "ok/dns",
@ -1124,7 +1146,7 @@ func Test_canonicalize(t *testing.T) {
DNSNames: []string{"www.example.com", "example.com"},
},
},
wantCanonicalized: &x509.CertificateRequest{
want: &x509.CertificateRequest{
DNSNames: []string{"example.com", "www.example.com"},
IPAddresses: []net.IP{},
},
@ -1139,7 +1161,7 @@ func Test_canonicalize(t *testing.T) {
DNSNames: []string{"www.example.com"},
},
},
wantCanonicalized: &x509.CertificateRequest{
want: &x509.CertificateRequest{
Subject: pkix.Name{
CommonName: "example.com",
},
@ -1154,7 +1176,7 @@ func Test_canonicalize(t *testing.T) {
IPAddresses: []net.IP{net.ParseIP("192.168.43.42"), net.ParseIP("192.168.42.42")},
},
},
wantCanonicalized: &x509.CertificateRequest{
want: &x509.CertificateRequest{
DNSNames: []string{},
IPAddresses: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.43.42")},
},
@ -1167,7 +1189,7 @@ func Test_canonicalize(t *testing.T) {
IPAddresses: []net.IP{net.ParseIP("192.168.43.42"), net.ParseIP("192.168.42.42")},
},
},
wantCanonicalized: &x509.CertificateRequest{
want: &x509.CertificateRequest{
DNSNames: []string{"example.com", "www.example.com"},
IPAddresses: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.43.42")},
},
@ -1183,7 +1205,7 @@ func Test_canonicalize(t *testing.T) {
IPAddresses: []net.IP{net.ParseIP("192.168.43.42"), net.ParseIP("192.168.42.42")},
},
},
wantCanonicalized: &x509.CertificateRequest{
want: &x509.CertificateRequest{
Subject: pkix.Name{
CommonName: "example.com",
},
@ -1191,11 +1213,31 @@ func Test_canonicalize(t *testing.T) {
IPAddresses: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.43.42")},
},
},
{
name: "ok/exclude-ip-from-common-name",
args: args{
csr: &x509.CertificateRequest{
Subject: pkix.Name{
CommonName: "127.0.0.1",
},
DNSNames: []string{"example.com"},
IPAddresses: []net.IP{net.ParseIP("192.168.43.42"), net.ParseIP("192.168.42.42")},
},
},
want: &x509.CertificateRequest{
Subject: pkix.Name{
CommonName: "127.0.0.1",
},
DNSNames: []string{"example.com"},
IPAddresses: []net.IP{net.ParseIP("192.168.42.42"), net.ParseIP("192.168.43.42")},
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if gotCanonicalized := canonicalize(tt.args.csr); !reflect.DeepEqual(gotCanonicalized, tt.wantCanonicalized) {
t.Errorf("canonicalize() = %v, want %v", gotCanonicalized, tt.wantCanonicalized)
got := canonicalize(tt.args.csr)
if !cmp.Equal(tt.want, got) {
t.Errorf("canonicalize() diff =\n%s", cmp.Diff(tt.want, got))
}
})
}