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Enhance credential helper protocol to include auth headers
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Following from my original RFC submission [0], this submission is considered ready for full review. This patch series is now based on top of current master (9c32cfb49c60fa8173b9666db02efe3b45a8522f) that includes my now separately submitted patches [1] to fix up the other credential helpers' behaviour. In this patch series I update the existing credential helper design in order to allow for some new scenarios, and future evolution of auth methods that Git hosts may wish to provide. I outline the background, summary of changes and some challenges below. Testing these new additions, I introduce a new test helper test-http-server that acts as a frontend to git-http-backend; a mini HTTP server based heavily on git-daemon, with simple authentication configurable by command line args. Background ========== Git uses a variety of protocols [2]: local, Smart HTTP, Dumb HTTP, SSH, and Git. Here I focus on the Smart HTTP protocol, and attempt to enhance the authentication capabilities of this protocol to address limitations (see below). The Smart HTTP protocol in Git supports a few different types of HTTP authentication - Basic and Digest (RFC 2617) [3], and Negotiate (RFC 2478) [4]. Git uses a extensible model where credential helpers can provide credentials for protocols [5]. Several helpers support alternatives such as OAuth authentication (RFC 6749) [6], but this is typically done as an extension. For example, a helper might use basic auth and set the password to an OAuth Bearer access token. Git uses standard input and output to communicate with credential helpers. After a HTTP 401 response, Git would call a credential helper with the following over standard input: protocol=https host=example.com And then a credential helper would return over standard output: protocol=https host=example.com username=bob@id.example.com password=<BEARER-TOKEN> Git then the following request to the remote, including the standard HTTP Authorization header (RFC 7235 Section 4.2) [7]: GET /info/refs?service=git-upload-pack HTTP/1.1 Host: git.example Git-Protocol: version=2 Authorization: Basic base64(bob@id.example.com:<BEARER-TOKEN>) Credential helpers are encouraged (see gitcredentials.txt) to return the minimum information necessary. Limitations =========== Because this credential model was built mostly for password based authentication systems, it's somewhat limited. In particular: 1. To generate valid credentials, additional information about the request (or indeed the requestee and their device) may be required. For example, OAuth is based around scopes. A scope, like "git.read", might be required to read data from the remote. However, the remote cannot tell the credential helper what scope is required for this request. 2. This system is not fully extensible. Each time a new type of authentication (like OAuth Bearer) is invented, Git needs updates before credential helpers can take advantage of it (or leverage a new capability in libcurl). Goals ===== * As a user with multiple federated cloud identities: * Reach out to a remote and have my credential helper automatically prompt me for the correct identity. * Allow credential helpers to differentiate between different authorities or authentication/authorization challenge types, even from the same DNS hostname (and without needing to use credential.useHttpPath). * Leverage existing authentication systems built-in to many operating systems and devices to boost security and reduce reliance on passwords. * As a Git host and/or cloud identity provider: * Enforce security policies (like requiring two-factor authentication) dynamically. * Allow integration with third party standard based identity providers in enterprises allowing customers to have a single plane of control for critical identities with access to source code. Design Principles ================= * Use the existing infrastructure. Git credential helpers are an already-working model. * Follow widely-adopted time-proven open standards, avoid net new ideas in the authentication space. * Minimize knowledge of authentication in Git; maintain modularity and extensibility. Proposed Changes ================ 1. Teach Git to read HTTP response headers, specifically the standard WWW-Authenticate (RFC 7235 Section 4.1) headers. 2. Teach Git to include extra information about HTTP responses that require authentication when calling credential helpers. Specifically the WWW-Authenticate header information. Because the extra information forms an ordered list, and the existing credential helper I/O format only provides for simple key=value pairs, we introduce a new convention for transmitting an ordered list of values. Key names that are suffixed with a C-style array syntax should have values considered to form an order list, i.e. key[]=value, where the order of the key=value pairs in the stream specifies the order. For the WWW-Authenticate header values we opt to use the key wwwauth[]. Handling the WWW-Authenticate header in detail ============================================== RFC 6750 [8] envisions that OAuth Bearer resource servers would give responses that include WWW-Authenticate headers, for example: HTTP/1.1 401 Unauthorized WWW-Authenticate: Bearer realm="login.example", scope="git.readwrite" WWW-Authenticate: Basic realm="login.example" Specifically, a WWW-Authenticate header consists of a scheme and arbitrary attributes, depending on the scheme. This pattern enables generic OAuth or OpenID Connect [9] authorities. Note that it is possible to have several WWW-Authenticate challenges in a response. First Git attempts to make a request, unauthenticated, which fails with a 401 response and includes WWW-Authenticate header(s). Next, Git invokes a credential helper which may prompt the user. If the user approves, a credential helper can generate a token (or any auth challenge response) to be used for that request. For example: with a remote that supports bearer tokens from an OpenID Connect [9] authority, a credential helper can use OpenID Connect's Discovery [10] and Dynamic Client Registration [11] to register a client and make a request with the correct permissions to access the remote. In this manner, a user can be dynamically sent to the right federated identity provider for a remote without any up-front configuration or manual processes. Following from the principle of keeping authentication knowledge in Git to a minimum, we modify Git to add all WWW-Authenticate values to the credential helper call. Git sends over standard input: protocol=https host=example.com wwwauth[]=Bearer realm="login.example", scope="git.readwrite" wwwauth[]=Basic realm="login.example" A credential helper that understands the extra wwwauth[n] property can decide on the "best" or correct authentication scheme, generate credentials for the request, and interact with the user. The credential helper would then return over standard output: protocol=https host=example.com path=foo.git username=bob@identity.example password=<BEARER-TOKEN> Note that WWW-Authenticate supports multiple challenges, either in one header: HTTP/1.1 401 Unauthorized WWW-Authenticate: Bearer realm="login.example", scope="git.readwrite", Basic realm="login.example" or in multiple headers: HTTP/1.1 401 Unauthorized WWW-Authenticate: Bearer realm="login.example", scope="git.readwrite" WWW-Authenticate: Basic realm="login.example" These have equivalent meaning (RFC 2616 Section 4.2 [12]). To simplify the implementation, Git will not merge or split up any of these WWW-Authenticate headers, and instead pass each header line as one credential helper property. The credential helper is responsible for splitting, merging, and otherwise parsing these header values. An alternative option to sending the header fields individually would be to merge the header values in to one key=value property, for example: ... wwwauth=Bearer realm="login.example", scope="git.readwrite", Basic realm="login.example" Future work =========== In the future we can further expand the protocol to allow credential helpers decide the best authentication scheme. Today credential helpers are still only expected to return a username/password pair to Git, meaning the other authentication schemes that may be offered still need challenge responses sent via a Basic Authorization header. The changes outlined above still permit helpers to select and configure an available authentication mode, but require the remote for example to unpack a bearer token from a basic challenge. More careful consideration is required in the handling of custom authentication schemes which may not have a username, or may require arbitrary additional request header values be set. For example imagine a new "FooBar" authentication scheme that is surfaced in the following response: HTTP/1.1 401 Unauthorized WWW-Authenticate: FooBar realm="login.example", algs="ES256 PS256" With support for arbitrary authentication schemes, Git would call credential helpers with the following over standard input: protocol=https host=example.com wwwauth[]=FooBar realm="login.example", algs="ES256 PS256", nonce="abc123" And then an enlightened credential helper could return over standard output: protocol=https host=example.com authtype=FooBar username=bob@id.example.com password=<FooBar credential> header[]=X-FooBar: 12345 header[]=X-FooBar-Alt: ABCDEF Git would be expected to attach this authorization header to the next request: GET /info/refs?service=git-upload-pack HTTP/1.1 Host: git.example Git-Protocol: version=2 Authorization: FooBar <FooBar credential> X-FooBar: 12345 X-FooBar-Alt: ABCDEF Why not SSH? ============ There's nothing wrong with SSH. However, Git's Smart HTTP transport is widely used, often with OAuth Bearer tokens. Git's Smart HTTP transport sometimes requires less client setup than SSH transport, and works in environments when SSH ports may be blocked. As long as Git supports HTTP transport, it should support common and popular HTTP authentication methods. References ========== * [0] [PATCH 0/8] [RFC] Enhance credential helper protocol to include auth headers https://lore.kernel.org/git/pull.1352.git.1663097156.gitgitgadget@gmail.com/ * [1] [PATCH 0/3] Correct credential helper discrepancies handling input https://lore.kernel.org/git/pull.1363.git.1663865974.gitgitgadget@gmail.com/ * [2] Git on the Server - The Protocols https://git-scm.com/book/en/v2/Git-on-the-Server-The-Protocols * [3] HTTP Authentication: Basic and Digest Access Authentication https://datatracker.ietf.org/doc/html/rfc2617 * [4] The Simple and Protected GSS-API Negotiation Mechanism https://datatracker.ietf.org/doc/html/rfc2478 * [5] Git Credentials - Custom Helpers https://git-scm.com/docs/gitcredentials#_custom_helpers * [6] The OAuth 2.0 Authorization Framework https://datatracker.ietf.org/doc/html/rfc6749 * [7] Hypertext Transfer Protocol (HTTP/1.1): Authentication https://datatracker.ietf.org/doc/html/rfc7235 * [8] The OAuth 2.0 Authorization Framework: Bearer Token Usage https://datatracker.ietf.org/doc/html/rfc6750 * [9] OpenID Connect Core 1.0 https://openid.net/specs/openid-connect-core-1_0.html * [10] OpenID Connect Discovery 1.0 https://openid.net/specs/openid-connect-discovery-1_0.html * [11] OpenID Connect Dynamic Client Registration 1.0 https://openid.net/specs/openid-connect-registration-1_0.html * [12] Hypertext Transfer Protocol (HTTP/1.1) https://datatracker.ietf.org/doc/html/rfc2616 Updates from RFC ================ * Submitted first three patches as separate submission: https://lore.kernel.org/git/pull.1363.git.1663865974.gitgitgadget@gmail.com/ * Various style fixes and updates to- and addition of comments. * Drop the explicit integer index in new 'array' style credential helper attrbiutes ("key[n]=value" becomes just "key[]=value"). * Added test helper; a mini HTTP server, and several tests. Updates in v3 ============= * Split final patch that added the test-http-server in to several, easier to review patches. * Updated wording in git-credential.txt to clarify which side of the credential helper protocol is sending/receiving the new wwwauth and authtype attributes. Updates in v4 ============= * Drop authentication scheme selection authtype attribute patches to greatly simplify the series; auth scheme selection is punted to a future series. This series still allows credential helpers to generate credentials and intelligently select correct identities for a given auth challenge. Matthew John Cheetham (8): http: read HTTP WWW-Authenticate response headers credential: add WWW-Authenticate header to cred requests test-http-server: add stub HTTP server test helper test-http-server: add HTTP error response function test-http-server: add HTTP request parsing test-http-server: pass Git requests to http-backend test-http-server: add simple authentication t5556: add HTTP authentication tests Documentation/git-credential.txt | 18 +- Makefile | 2 + contrib/buildsystems/CMakeLists.txt | 13 + credential.c | 13 + credential.h | 15 + http.c | 78 ++ t/helper/.gitignore | 1 + t/helper/test-credential-helper-replay.sh | 14 + t/helper/test-http-server.c | 1146 +++++++++++++++++++++ t/t5556-http-auth.sh | 223 ++++ 10 files changed, 1522 insertions(+), 1 deletion(-) create mode 100755 t/helper/test-credential-helper-replay.sh create mode 100644 t/helper/test-http-server.c create mode 100755 t/t5556-http-auth.sh base-commit: c48035d29b4e524aed3a32f0403676f0d9128863 Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1352%2Fmjcheetham%2Femu-v4 Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1352/mjcheetham/emu-v4 Pull-Request: https://github.com/gitgitgadget/git/pull/1352 Range-diff vs v3: 1: f297c78f60a = 1: b5b56ccd941 http: read HTTP WWW-Authenticate response headers 2: e45e23406a5 ! 2: d02875dda7c credential: add WWW-Authenticate header to cred requests @@ Documentation/git-credential.txt: empty string. + to credential helpers. + Each 'WWW-Authenticate' header value is passed as a multi-valued + attribute 'wwwauth[]', where the order of the attributes is the same as -+ they appear in the HTTP response. ++ they appear in the HTTP response. This attribute is 'one-way' from Git ++ to pass additional information to credential helpers. + + Unrecognised attributes are silently discarded. + GIT - --- - Part of the linkgit:git[1] suite ## credential.c ## @@ credential.c: static void credential_write_item(FILE *fp, const char *key, const char *value, 3: 65ac638b8a0 < -: ----------- http: store all request headers on active_request_slot 4: 4d75ca29cc5 < -: ----------- http: move proactive auth to first slot creation 5: 2f38427aa8d < -: ----------- http: set specific auth scheme depending on credential 6: 4947e81546a = 3: 07a1845ea56 test-http-server: add stub HTTP server test helper 7: 93bdf1d7060 = 4: 98dd286db7c test-http-server: add HTTP error response function 8: b3e9156755f = 5: 5c4e36e23ee test-http-server: add HTTP request parsing 9: 5fb248c074a = 6: 0a0f4fd10c8 test-http-server: pass Git requests to http-backend 10: 192f09b9de4 = 7: 794256754c1 test-http-server: add simple authentication 11: b64d2f2c473 ! 8: 8ecf6383522 t5556: add HTTP authentication tests @@ Commit message t5556: add HTTP authentication tests Add a series of tests to exercise the HTTP authentication header parsing - and the interop with credential helpers. Credential helpers can respond - to requests that contain WWW-Authenticate information with the ability - to select the response Authenticate header scheme. + and the interop with credential helpers. Credential helpers will receive + WWW-Authenticate information in credential requests. Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com> @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' git ls-remote $ORIGIN_URL ' -+test_expect_success 'http auth www-auth headers to credential helper bearer valid' ' -+ test_when_finished "per_test_cleanup" && -+ start_http_server \ -+ --auth=bearer:authority=\"id.example.com\"\ q=1\ p=0 \ -+ --auth=basic:realm=\"example.com\" \ -+ --auth-token=bearer:secret-token && -+ -+ cat >get-expected.cred <<-EOF && -+ protocol=http -+ host=$HOST_PORT -+ wwwauth[]=bearer authority="id.example.com" q=1 p=0 -+ wwwauth[]=basic realm="example.com" -+ EOF -+ -+ cat >store-expected.cred <<-EOF && -+ protocol=http -+ host=$HOST_PORT -+ username=alice -+ password=secret-token -+ authtype=bearer -+ EOF -+ -+ cat >get-response.cred <<-EOF && -+ protocol=http -+ host=$HOST_PORT -+ username=alice -+ password=secret-token -+ authtype=bearer -+ EOF -+ -+ git -c credential.helper="$CREDENTIAL_HELPER" ls-remote $ORIGIN_URL && -+ -+ test_cmp get-expected.cred get-actual.cred && -+ test_cmp store-expected.cred store-actual.cred -+' -+ +test_expect_success 'http auth www-auth headers to credential helper basic valid' ' + test_when_finished "per_test_cleanup" && + # base64("alice:secret-passwd") @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + export USERPASS64 && + + start_http_server \ -+ --auth=bearer:authority=\"id.example.com\"\ q=1\ p=0 \ + --auth=basic:realm=\"example.com\" \ + --auth-token=basic:$USERPASS64 && + + cat >get-expected.cred <<-EOF && + protocol=http + host=$HOST_PORT -+ wwwauth[]=bearer authority="id.example.com" q=1 p=0 + wwwauth[]=basic realm="example.com" + EOF + @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + host=$HOST_PORT + username=alice + password=secret-passwd -+ authtype=basic + EOF + + cat >get-response.cred <<-EOF && @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + host=$HOST_PORT + username=alice + password=secret-passwd -+ authtype=basic + EOF + + git -c credential.helper="$CREDENTIAL_HELPER" ls-remote $ORIGIN_URL && @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + test_cmp store-expected.cred store-actual.cred +' + -+test_expect_success 'http auth www-auth headers to credential helper custom scheme' ' ++test_expect_success 'http auth www-auth headers to credential helper custom schemes' ' + test_when_finished "per_test_cleanup" && ++ # base64("alice:secret-passwd") ++ USERPASS64=YWxpY2U6c2VjcmV0LXBhc3N3ZA== && ++ export USERPASS64 && ++ + start_http_server \ + --auth=foobar:alg=test\ widget=1 \ + --auth=bearer:authority=\"id.example.com\"\ q=1\ p=0 \ + --auth=basic:realm=\"example.com\" \ -+ --auth-token=foobar:SECRET-FOOBAR-VALUE && ++ --auth-token=basic:$USERPASS64 && + + cat >get-expected.cred <<-EOF && + protocol=http @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + protocol=http + host=$HOST_PORT + username=alice -+ password=SECRET-FOOBAR-VALUE -+ authtype=foobar ++ password=secret-passwd + EOF + + cat >get-response.cred <<-EOF && + protocol=http + host=$HOST_PORT + username=alice -+ password=SECRET-FOOBAR-VALUE -+ authtype=foobar ++ password=secret-passwd + EOF + + git -c credential.helper="$CREDENTIAL_HELPER" ls-remote $ORIGIN_URL && @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + +test_expect_success 'http auth www-auth headers to credential helper invalid' ' + test_when_finished "per_test_cleanup" && ++ # base64("alice:secret-passwd") ++ USERPASS64=YWxpY2U6c2VjcmV0LXBhc3N3ZA== && ++ export USERPASS64 && + start_http_server \ + --auth=bearer:authority=\"id.example.com\"\ q=1\ p=0 \ + --auth=basic:realm=\"example.com\" \ -+ --auth-token=bearer:secret-token && ++ --auth-token=basic:$USERPASS64 && + + cat >get-expected.cred <<-EOF && + protocol=http @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + protocol=http + host=$HOST_PORT + username=alice -+ password=invalid-token -+ authtype=bearer ++ password=invalid-passwd + wwwauth[]=bearer authority="id.example.com" q=1 p=0 + wwwauth[]=basic realm="example.com" + EOF @@ t/t5556-http-auth.sh: test_expect_success 'http auth anonymous no challenge' ' + protocol=http + host=$HOST_PORT + username=alice -+ password=invalid-token -+ authtype=bearer ++ password=invalid-passwd + EOF + + test_must_fail git -c credential.helper="$CREDENTIAL_HELPER" ls-remote $ORIGIN_URL &&