package dns
import (
"net"
"testing"
)
// TestPackDataOpt tests generated using fuzz.go and with a message pack
// containing the following bytes:
// "0000\x00\x00000000\x00\x00/00000" +
// "0\x00\v\x00#\b00000000\x00\x00)000" +
// "000\x00\x1c00\x00\x0000\x00\x01000\x00\x00\x00\b" +
// "\x00\v\x00\x02\x0000000000"
// That bytes sequence created the overflow error.
func TestPackDataOpt(t *testing.T) {
type args struct {
option []EDNS0
msg []byte
off int
}
tests := []struct {
name string
args args
want int
wantErr bool
wantErrMsg string
}{
{
name: "overflow",
args: args{
option: []EDNS0{
&EDNS0_LOCAL{Code: 0x3030, Data: []uint8{}},
&EDNS0_LOCAL{Code: 0x3030, Data: []uint8{0x30}},
&EDNS0_LOCAL{Code: 0x3030, Data: []uint8{}},
&EDNS0_SUBNET{
Code: 0x0, Family: 0x2,
SourceNetmask: 0x0, SourceScope: 0x30,
Address: net.IP{0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}},
},
msg: []byte{
0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x2,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2f, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x0b, 0x00,
0x23, 0x08, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x00, 0x00, 0x29, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x00, 0x00, 0x30, 0x30, 0x00,
0x00, 0x30, 0x30, 0x00, 0x01, 0x30, 0x00, 0x00,
0x00,
},
off: 54,
},
wantErr: true,
wantErrMsg: "dns: overflow packing opt",
want: 57,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := packDataOpt(tt.args.option, tt.args.msg, tt.args.off)
if (err != nil) != tt.wantErr {
t.Errorf("packDataOpt() error = %v, wantErr %v", err, tt.wantErr)
return
}
if err != nil && tt.wantErrMsg != err.Error() {
t.Errorf("packDataOpt() error msg = %v, wantErrMsg %v", err.Error(), tt.wantErrMsg)
return
}
if got != tt.want {
t.Errorf("packDataOpt() = %v, want %v", got, tt.want)
}
})
}
}
// TestCrashNSEC tests generated using fuzz.go and with a message pack
// containing the following bytes:
// "0000\x00\x00000000\x00\x00/00000" +
// "0\x00\v\x00#\b00000\x00\x00\x00\x00\x00\x1a000" +
// "000\x00\x00\x00\x00\x1a000000\x00\x00\x00\x00\x1a0" +
// "00000\x00\v00\a0000000\x00"
// That byte sequence, when Unpack() and subsequent Pack() created a
// panic: runtime error: slice bounds out of range
// which was attributed to the fact that NSEC RR length computation was different (and smaller)
// then when within packDataNsec.
func TestCrashNSEC(t *testing.T) {
compression := make(map[string]struct{})
nsec := &NSEC{
Hdr: RR_Header{
Name: ".",
Rrtype: 0x2f,
Class: 0x3030,
Ttl: 0x30303030,
Rdlength: 0xb,
},
NextDomain: ".",
TypeBitMap: []uint16{
0x2302, 0x2303, 0x230a, 0x230b,
0x2312, 0x2313, 0x231a, 0x231b,
0x2322, 0x2323,
},
}
expectedLength := 19
l := nsec.len(0, compression)
if l != expectedLength {
t.Fatalf("expected length of %d, got %d", expectedLength, l)
}
}
// TestCrashNSEC3 tests generated using fuzz.go and with a message pack
// containing the following bytes:
// "0000\x00\x00000000\x00\x00200000" +
// "0\x00\v0000\x00\x00#\x0300\x00\x00\x00\x1a000" +
// "000\x00\v00\x0200\x00\x03000\x00"
// That byte sequence, when Unpack() and subsequent Pack() created a
// panic: runtime error: slice bounds out of range
// which was attributed to the fact that NSEC3 RR length computation was
// different (and smaller) then within NSEC3.pack (which relies on
// packDataNsec).
func TestCrashNSEC3(t *testing.T) {
compression := make(map[string]struct{})
nsec3 := &NSEC3{
Hdr: RR_Header{
Name: ".",
Rrtype: 0x32,
Class: 0x3030,
Ttl: 0x30303030,
Rdlength: 0xb,
},
Hash: 0x30,
Flags: 0x30,
Iterations: 0x3030,
SaltLength: 0x0,
Salt: "",
HashLength: 0x0,
NextDomain: ".",
TypeBitMap: []uint16{
0x2302, 0x2303, 0x230a, 0x230b,
},
}
expectedLength := 24
l := nsec3.len(0, compression)
if l != expectedLength {
t.Fatalf("expected length of %d, got %d", expectedLength, l)
}
}
// TestNewRRCommentLengthCrasherString test inputs to NewRR that generated crashes.
func TestNewRRCommentLengthCrasherString(t *testing.T) {
tests := []struct {
name string
in string
err string
}{
{
"HINFO1", " HINFO ;;;;;;;;;;;;;" +
";;;;;;;;\x00\x19;;;;;;;;;;" +
";\u007f;;;;;;;;;;;;;;;;;;" +
";;}mP_Qq_3sJ_1_84X_5" +
"45iW_3K4p8J8_v9_LT3_" +
"6_0l_3D4VT3xq6N_3K__" +
"_U_xX2m;;;;;;(;;;;;;" +
";;;;;;;;;;;;;;;\x1d;;;;" +
";;;;;;-0x804dBDe8ba " +
"\t \t\tr HINFO \" \t\t\tve" +
"k1xH11e__P6_dk1_51bo" +
"g8gJK1V_O_v84_Bw4_1_" +
"72jQ3_0J3V_S5iYn4h5X" +
"R_2n___51J nN_ \t\tm " +
"aa_XO4_5\t \t\t \t\tg6b" +
"p_KI_1_YWc_K8c2b___A" +
"e_Y1m__4Y_R_avy6t08x" +
"b5Cp9_7uS_yLa\t\t\t d " +
"EKe1Q83vS___ a \t\t " +
"\tmP_Qq_3sJ_1_84X_545" +
"iW_3K4p8J8_v9_LT3_6_" +
"0l_3D4VT3xq6N_3K___U" +
"_xX2\"\" \t \t_fL Ogl5" +
"_09i_9__3O7C__QMAG2U" +
"35IO8RRU6aJ9_6_57_6_" +
"b05BMoX5I__4833_____" +
"yfD_2_OPs__sqzM_pqQi" +
"_\t\t \tN__GuY4_Trath_0" +
"yy___cAK_a__0J0q5 L_" +
"p63Fzdva_Lb_29V7_R__" +
"Go_H2_8m_4__FJM5B_Y5" +
"Slw_ghp_55l_X2_Pnt6Y" +
"_Wd_hM7jRZ_\t\t \tm \t" +
" \t\ta md rK \x00 7_\"sr " +
"- sg o -0x804dBDe8b" +
"a \t \t\tN_W6J3PBS_W__C" +
"yJu__k6F_jY0INI_LC27" +
"7x14b_1b___Y8f_K_3y_" +
"0055yaP_LKu_72g_T_32" +
"iBk1Zm_o 9i1P44_S0_" +
"_4AXUpo2__H55tL_g78_" +
"8V_8l0yg6bp_KI_1_YWc" +
"_K8c2b \t \tmaa_XO4_5" +
"rg6bp_KI_1_YWc_K8c2b" +
" _C20w i_4 \t\t u_k d" +
" rKsg09099 \"\"2335779" +
"05047986112651e025 \t" +
" \t\tN_W6J3PBS_W__CyJu" +
"__k6F_jY0INI_LC277x1" +
"4b_1b___Y8f_K_3y_005" +
"5yaP_LKu_72g_T_32iBk" +
"1Zm_o 9i1P44_S0__4A" +
"XUpo2__H55tL_g78_8V_" +
"8l0y_9K9_C__6af__wj_" +
"UbSYy_ge29S_s_Qe259q" +
"_kGod \t\t\t\t :0xb1AF1F" +
"b71D2ACeaB3FEce2ssg " +
"o dr-0x804dBDe8ba \t " +
"\t\t$ Y5 _BzOc6S_Lk0K" +
"y43j1TzV__9367tbX56_" +
"6B3__q6_v8_4_0_t_2q_" +
"nJ2gV3j9_tkOrx_H__a}" +
"mT 0g6bp_KI_1_YWc_K8" +
"c2b\t_ a\t \t54KM8f9_63" +
"zJ2Q_c1_C_Zf4ICF4m0q" +
"_RVm_3Zh4vr7yI_H2 a" +
" m 0yq__TiqA_FQBv_SS" +
"_Hm_8T8__M8F2_53TTo_" +
"k_o2__u_W6Vr__524q9l" +
"9CQsC_kOU___g_94 \"" +
" ~a_j_16_6iUSu_96V1W" +
"5r01j____gn157__8_LO" +
"0y_08Jr6OR__WF8__JK_" +
"N_wx_k_CGB_SjJ9R74i_" +
"7_1t_6 m NULLNULLNUL" +
"L \t \t\t\t drK\t\x00 7_\"\" 5" +
"_5_y732S43__D_8U9FX2" +
"27_k\t\tg6bp_KI_1_YWc_" +
"K8c2b_J_wx8yw1CMw27j" +
"___f_a8uw_ Er9gB_L2 " +
"\t\t \t\t\tm aa_XO4_5 Y_" +
" I_T7762_zlMi_n8_FjH" +
"vy62p__M4S_8__r092af" +
"P_T_vhp6__SA_jVF13c5" +
"2__8J48K__S4YcjoY91X" +
"_iNf06 am aa_XO4_5\t" +
" d _ am_SYY4G__2h4QL" +
"iUIDd \t\t \tXXp__KFjR" +
"V__JU3o\"\" d \t_Iks_ " +
"aa_XO4_5<g6bp_KI_1_Y" +
"Wc_K8c2b _BzOc6S_Lk0" +
"Ky43j1TzV__9367tbX56" +
"_6B3__q6_v8_4_0_t_2q" +
"_nJ2gV3j9_tkOrx_H__ " +
"a\t_Iks_ \\ ma 0_58_r1" +
"y8jib_FaV_C_e \t \td\"\"" +
" ^Dy_0 \t\t \t ;;;;;;;" +
";;;;;;;;;;;",
`dns: bad HINFO Fields: "comment length insufficient for parsing" at line: 1:1951`,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
_, err := NewRR(tc.in)
if err == nil {
t.Errorf("Expecting error for crasher line %s", tc.in)
}
if tc.err != err.Error() {
t.Errorf("Expecting error %s, got %s", tc.err, err.Error())
}
})
}
}