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JWT: updated to make JWT algorithm support more flexible, and simple to extend with specific algorithm.

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This commit is contained in:
Jocelyn FIAT
2018-10-17 10:59:57 +02:00
parent f97f59b703
commit 0baa05cf63
10 changed files with 340 additions and 84 deletions
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16
library/security/jwt/src/jws.e
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@@ -64,14 +64,16 @@ feature -- Conversion
encoded_string (a_secret: READABLE_STRING_8): STRING
local
alg, sign: READABLE_STRING_8
sign, alg_name: READABLE_STRING_8
alg: JWT_ALG
l_enc_payload, l_enc_header: READABLE_STRING_8
do
reset_error
alg := header.algorithm
if not is_supporting_signature_algorithm (alg) then
report_unsupported_alg_error (alg)
alg := alg_hs256 -- Default ...
alg_name := header.algorithm
alg := algorithms [alg_name]
if alg = Void then
report_unsupported_alg_error (alg_name)
alg := algorithms.hs256 -- Default ...
end
l_enc_header := base64url_encode (header.string)
l_enc_payload := base64url_encode (claimset.string)
@@ -94,12 +96,12 @@ feature -- Element change
set_algorithm_to_hs256
do
set_algorithm (alg_hs256)
set_algorithm (algorithms.hs256.name)
end
set_algorithm_to_none
do
set_algorithm (alg_none)
set_algorithm (algorithms.none.name)
end
end

8
library/security/jwt/src/jwt.e
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@@ -16,12 +16,15 @@ feature {NONE} -- Initialization
default_create
do
create algorithms
create header
create claimset
end
feature -- Access
algorithms: JWT_ALGORITHMS
header: JWT_HEADER
claimset: JWT_CLAIMSET
@@ -91,6 +94,11 @@ feature -- status report
Result := attached errors as errs and then across errs as ic some attached {JWT_UNSUPPORTED_ALG_ERROR} ic.item end
end
has_mismatched_alg_error: BOOLEAN
do
Result := attached errors as errs and then across errs as ic some attached {JWT_MISMATCHED_ALG_ERROR} ic.item end
end
has_unverified_token_error: BOOLEAN
do
Result := attached errors as errs and then across errs as ic some attached {JWT_UNVERIFIED_TOKEN_ERROR} ic.item end

27
library/security/jwt/src/jwt_alg.e Normal file
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@@ -0,0 +1,27 @@
note
description: "Summary description for {JWT_ALG}."
author: ""
date: "$Date$"
revision: "$Revision$"
deferred class
JWT_ALG
feature -- Access
name: READABLE_STRING_8
deferred
end
encoded_string (a_message: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING
deferred
end
feature -- Status report
is_none: BOOLEAN
-- Is Current algorithm is "none" ?
do
end
end

57
library/security/jwt/src/jwt_alg_hs256.e Normal file
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@@ -0,0 +1,57 @@
note
description: "Summary description for {JWT_ALG_HS256}."
author: ""
date: "$Date$"
revision: "$Revision$"
class
JWT_ALG_HS256
inherit
JWT_ALG
feature -- Access
name: STRING = "hs256"
encoded_string (a_message: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING
do
Result := base64_hmacsha256 (a_message, a_secret)
end
feature {NONE} -- Implementation
base64_hmacsha256 (s: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING_8
local
hs256: HMAC_SHA256
do
create hs256.make_ascii_key (a_secret)
hs256.update_from_string (s)
-- if Version >= EiffelStudio 18.01 then
-- Result := hs256.base64_digest --lowercase_hexadecimal_string_digest
-- else
Result := base64_bytes_encoded_string (hs256.digest)
-- end
end
base64_bytes_encoded_string (a_bytes: SPECIAL [NATURAL_8]): STRING_8
-- Base64 string from `a_bytes`.
--| Note: to be removed when 18.01 is not latest release anymore.
local
s: STRING
i,n: INTEGER
do
from
i := 1
n := a_bytes.count
create s.make (n)
until
i > n
loop
s.append_code (a_bytes[i - 1])
i := i + 1
end
Result := (create {BASE64}).encoded_string (s)
end
end

30
library/security/jwt/src/jwt_alg_none.e Normal file
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@@ -0,0 +1,30 @@
note
description: "Summary description for {JWT_ALG_NONE}."
author: ""
date: "$Date$"
revision: "$Revision$"
class
JWT_ALG_NONE
inherit
JWT_ALG
redefine
is_none
end
feature -- Access
name: STRING = "none"
encoded_string (a_message: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING
do
create Result.make_empty
end
feature -- Status report
is_none: BOOLEAN = True
-- Is Current algorithm is "none" ?
end

98
library/security/jwt/src/jwt_algorithms.e Normal file
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@@ -0,0 +1,98 @@
note
description: "Summary description for {JWT_ALGORITHMS}."
author: ""
date: "$Date$"
revision: "$Revision$"
class
JWT_ALGORITHMS
inherit
ANY
redefine
default_create
end
create
default_create
feature {NONE} -- Initialization
default_create
do
create items.make_caseless (2)
register_algorithm (hs256)
register_algorithm (none)
-- TODO: check if this is acceptable default.
set_default_algorithm ({JWT_ALG_HS256}.name)
end
feature -- Access
hs256: JWT_ALG_HS256
do
create Result
end
none: JWT_ALG_NONE
do
create Result
end
feature -- Access
default_algorithm: JWT_ALG
do
if attached internal_default_alg_name as l_alg_name then
Result := algorithm (l_alg_name)
end
if Result = Void then
Result := none
end
end
algorithm alias "[]" (a_name: READABLE_STRING_GENERAL): detachable JWT_ALG
do
Result := items [a_name]
end
feature -- Element change
register_algorithm (alg: attached like algorithm)
do
items [alg.name] := alg
end
unregister_algorithm (a_alg_name: READABLE_STRING_GENERAL)
do
items.remove (a_alg_name)
end
set_default_algorithm (a_alg_name: detachable READABLE_STRING_GENERAL)
do
if
a_alg_name = Void or else
not is_supported_algorithm (a_alg_name)
then
internal_default_alg_name := Void
else
internal_default_alg_name := a_alg_name
end
end
feature -- Status report
is_supported_algorithm (a_name: READABLE_STRING_GENERAL): BOOLEAN
do
Result := items.has (a_name)
end
feature {NONE} -- Implementation
items: STRING_TABLE [attached like algorithm]
internal_default_alg_name: detachable READABLE_STRING_GENERAL
invariant
end

26
library/security/jwt/src/jwt_loader.e
View File

@@ -9,6 +9,20 @@ class
inherit
JWT_UTILITIES
redefine
default_create
end
feature {NONE} -- Initialization
default_create
do
create algorithms
end
feature -- Settings
algorithms: JWT_ALGORITHMS
feature -- Access
@@ -18,11 +32,12 @@ feature -- Access
-- WARNING: passing Void for `a_alg` is not safe, as the server should know which alg he used for tokens,
-- leaving the possibility to use the header alg is dangerous as client may use "none" and then bypass verification!
require
a_valid_alg: a_alg /= Void implies is_supporting_signature_algorithm (a_alg)
a_valid_alg: a_alg /= Void implies algorithms.is_supported_algorithm (a_alg)
local
jws: JWS
i,j,n: INTEGER
alg, l_enc_payload, l_enc_header, l_signature: READABLE_STRING_8
alg_encoder: JWT_ALG
do
n := a_token_input.count
i := a_token_input.index_of ('.', 1)
@@ -43,17 +58,18 @@ feature -- Access
else
if alg = Void then
-- Use default
alg := alg_hs256
alg := algorithms.default_algorithm.name
end
end
jws.set_algorithm (alg)
check alg_set: alg /= Void end
if ctx = Void or else not ctx.validation_ignored then
if not is_supporting_signature_algorithm (alg) then
alg_encoder := algorithms [alg]
if alg_encoder = Void then
jws.report_unsupported_alg_error (alg)
alg := alg_hs256
alg_encoder := algorithms.default_algorithm
end
if not l_signature.same_string (signature (l_enc_header, l_enc_payload, a_verification_key, alg)) then
if not l_signature.same_string (signature (l_enc_header, l_enc_payload, a_verification_key, alg_encoder)) then
jws.report_unverified_token_error
end
if

70
library/security/jwt/src/jwt_utilities.e
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@@ -7,14 +7,6 @@ note
class
JWT_UTILITIES
feature -- Constants
alg_hs256: STRING = "HS256"
-- HMAC SHA256.
alg_none: STRING = "none"
-- for unsecured token.
feature -- Encoding
base64url_encode (s: READABLE_STRING_8): STRING_8
@@ -35,59 +27,19 @@ feature -- Encoding
Result.replace_substring_all ("/", "_")
end
signature (a_enc_header, a_enc_payload: READABLE_STRING_8; a_secret: READABLE_STRING_8; alg: READABLE_STRING_8): STRING_8
signature (a_enc_header, a_enc_payload: READABLE_STRING_8; a_secret: READABLE_STRING_8; alg: JWT_ALG): STRING_8
local
s: STRING
do
if alg.is_case_insensitive_equal (alg_none) then
if alg.is_none then
create Result.make_empty
else
create s.make (a_enc_header.count + 1 + a_enc_payload.count)
s.append (a_enc_header)
s.append_character ('.')
s.append (a_enc_payload)
if alg.is_case_insensitive_equal (alg_hs256) then
Result := base64_hmacsha256 (s, a_secret)
else
Result := base64_hmacsha256 (s, a_secret)
Result := urlsafe_encode (alg.encoded_string (s, a_secret))
end
Result := urlsafe_encode (Result)
end
end
base64_hmacsha256 (s: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING_8
local
hs256: HMAC_SHA256
do
create hs256.make_ascii_key (a_secret)
hs256.update_from_string (s)
-- if Version >= EiffelStudio 17.11 then
-- Result := hs256.base64_digest --lowercase_hexadecimal_string_digest
-- else
Result := base64_bytes_encoded_string (hs256.digest)
-- end
end
feature {NONE} -- Implementation
base64_bytes_encoded_string (a_bytes: SPECIAL [NATURAL_8]): STRING_8
-- Base64 string from `a_bytes`.
--| Note: to be removed when 17.11 is not latest release anymore.
local
s: STRING
i,n: INTEGER
do
from
i := 1
n := a_bytes.count
create s.make (n)
until
i > n
loop
s.append_code (a_bytes[i - 1])
i := i + 1
end
Result := (create {BASE64}).encoded_string (s)
end
feature -- Decoding
@@ -119,20 +71,4 @@ feature -- Decoding
end
end
feature -- Signature
supported_signature_algorithms: LIST [READABLE_STRING_8]
-- Supported signature algorithm `alg`?
do
create {ARRAYED_LIST [READABLE_STRING_8]} Result.make (2)
Result.extend (alg_hs256)
Result.extend (alg_none)
end
is_supporting_signature_algorithm (alg: READABLE_STRING_8): BOOLEAN
-- Is supporting signature algorithm `alg`?
do
Result := across supported_signature_algorithms as ic some alg.is_case_insensitive_equal (ic.item) end
end
end

22
library/security/jwt/testing/jwt_alg_test.e Normal file
View File

@@ -0,0 +1,22 @@
note
description: "Summary description for {JWT_ALG_TEST}."
author: ""
date: "$Date$"
revision: "$Revision$"
class
JWT_ALG_TEST
inherit
JWT_ALG
feature -- Access
name: STRING = "test"
encoded_string (a_message: READABLE_STRING_8; a_secret: READABLE_STRING_8): STRING
do
Result := "TEST<<"+ a_message + ">>"
end
end

66
library/security/jwt/testing/test_jwt.e
View File

@@ -16,6 +16,30 @@ inherit
feature -- Test
example
local
jwt: JWS
l_loader: JWT_LOADER
tok: STRING
do
create jwt.make_with_json_payload ("[
{"iss":"joe", "exp":1200819380,"http://example.com/is_root":true}
]")
jwt.set_algorithm_to_hs256
tok := jwt.encoded_string ("my-secret")
create l_loader
if
attached l_loader.token (tok, Void, "my-secret", Void) as l_tok and then
not l_tok.has_error
then
print (l_tok.claimset.string)
check verified: not l_tok.has_unverified_token_error end
check no_error: not l_tok.has_error end
end
end
test_jwt_io
local
jwt: JWS
@@ -185,7 +209,8 @@ feature -- Test
tok := jwt.encoded_string ("secret")
if attached (create {JWT_LOADER}).token (tok, "HS256", "secret", Void) as l_tok then
assert ("no error", not jwt.has_error)
assert ("error", l_tok.has_error)
assert ("has_mismatched_alg_error", l_tok.has_mismatched_alg_error)
assert ("same payload", l_tok.claimset.string.same_string (payload))
end
end
@@ -205,15 +230,50 @@ feature -- Test
tok := jwt.encoded_string ("secret")
if attached (create {JWT_LOADER}).token (tok, "none", "secret", Void) as l_tok then
assert ("no error", not jwt.has_error)
assert ("no error", not l_tok.has_error)
assert ("same payload", l_tok.claimset.string.same_string (payload))
end
if attached (create {JWT_LOADER}).token (tok, Void, "secret", Void) as l_tok then
assert ("no error", not jwt.has_error)
assert ("no error", not l_tok.has_error)
assert ("same payload", l_tok.claimset.string.same_string (payload))
end
end
test_additional_alg
local
jwt: JWS
payload: STRING
tok: STRING
l_loader: JWT_LOADER
do
payload := "[
{"iss":"joe","exp":1300819380,"http://example.com/is_root":true}
]"
create jwt.make_with_json_payload (payload)
jwt.algorithms.register_algorithm (create {JWT_ALG_TEST})
jwt.set_algorithm ({JWT_ALG_TEST}.name)
tok := jwt.encoded_string ("secret")
create l_loader
l_loader.algorithms.register_algorithm (create {JWT_ALG_TEST})
if attached l_loader.token (tok, "test", "secret", Void) as l_tok then
assert ("no error", not l_tok.has_error)
assert ("not has_unsupported_alg_error", not l_tok.has_unsupported_alg_error)
assert ("same payload", l_tok.claimset.string.same_string (payload))
end
if attached l_loader.token (tok, Void, "secret", Void) as l_tok then
assert ("no error", not l_tok.has_error)
assert ("same payload", l_tok.claimset.string.same_string (payload))
end
create l_loader
if attached l_loader.token (tok, "test", "secret", Void) as l_tok then
assert ("has error", l_tok.has_error)
assert ("has_unsupported_alg_error", l_tok.has_unsupported_alg_error)
end
end
feature -- Implementation
duplicated_time (dt: DATE_TIME): DATE_TIME