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credential: new attribute oauth_refresh_token
Git authentication with OAuth access token is supported by every popular
Git host including GitHub, GitLab and BitBucket [1][2][3]. Credential
helpers Git Credential Manager (GCM) and git-credential-oauth generate
OAuth credentials [4][5]. Following RFC 6749, the application prints a
link for the user to authorize access in browser. A loopback redirect
communicates the response including access token to the application.
For security, RFC 6749 recommends that OAuth response also includes
expiry date and refresh token [6]. After expiry, applications can use
the refresh token to generate a new access token without user
reauthorization in browser. GitLab and BitBucket set the expiry at two
hours [2][3]. (GitHub doesn't populate expiry or refresh token.)
However the Git credential protocol has no attribute to store the OAuth
refresh token (unrecognised attributes are silently discarded). This
means that the user has to regularly reauthorize the helper in browser.
On a browserless system, this is particularly intrusive, requiring a
second device.
Introduce a new attribute oauth_refresh_token. This is especially
useful when a storage helper and a read-only OAuth helper are configured
together. Recall that `credential fill` calls each helper until it has a
non-expired password.
```
[credential]
helper = storage # eg. cache or osxkeychain
helper = oauth
```
The OAuth helper can use the stored refresh token forwarded by
`credential fill` to generate a fresh access token without opening the
browser. See
https://github.com/hickford/git-credential-oauth/pull/3/files
for an implementation tested with this patch.
Add support for the new attribute to credential-cache. Eventually, I
hope to see support in other popular storage helpers.
Alternatives considered: ask helpers to store all unrecognised
attributes. This seems excessively complex for no obvious gain.
Helpers would also need extra information to distinguish between
confidential and non-confidential attributes.
Workarounds: GCM abuses the helper get/store/erase contract to store the
refresh token during credential *get* as the password for a fictitious
host [7] (I wrote this hack). This workaround is only feasible for a
monolithic helper with its own storage.
[1] https://github.blog/2012-09-21-easier-builds-and-deployments-using-git-over-https-and-oauth/
[2] https://docs.gitlab.com/ee/api/oauth2.html#access-git-over-https-with-access-token
[3] https://support.atlassian.com/bitbucket-cloud/docs/use-oauth-on-bitbucket-cloud/#Cloning-a-repository-with-an-access-token
[4] https://github.com/GitCredentialManager/git-credential-manager
[5] https://github.com/hickford/git-credential-oauth
[6] https://datatracker.ietf.org/doc/html/rfc6749#section-5.1
[7] 66b94e489a/src/shared/GitLab/GitLabHostProvider.cs (L207)
Signed-off-by: M Hickford <mirth.hickford@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
73876f4861
commit
a5c76569e7
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@ -150,6 +150,12 @@ Git understands the following attributes:
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When reading credentials from helpers, `git credential fill` ignores expired
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When reading credentials from helpers, `git credential fill` ignores expired
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passwords. Represented as Unix time UTC, seconds since 1970.
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passwords. Represented as Unix time UTC, seconds since 1970.
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`oauth_refresh_token`::
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An OAuth refresh token may accompany a password that is an OAuth access
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token. Helpers must treat this attribute as confidential like the password
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attribute. Git itself has no special behaviour for this attribute.
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`url`::
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`url`::
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When this special attribute is read by `git credential`, the
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When this special attribute is read by `git credential`, the
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@ -130,6 +130,9 @@ static void serve_one_client(FILE *in, FILE *out)
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if (e->item.password_expiry_utc != TIME_MAX)
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if (e->item.password_expiry_utc != TIME_MAX)
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fprintf(out, "password_expiry_utc=%"PRItime"\n",
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fprintf(out, "password_expiry_utc=%"PRItime"\n",
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e->item.password_expiry_utc);
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e->item.password_expiry_utc);
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if (e->item.oauth_refresh_token)
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fprintf(out, "oauth_refresh_token=%s\n",
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e->item.oauth_refresh_token);
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}
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}
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}
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}
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else if (!strcmp(action.buf, "exit")) {
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else if (!strcmp(action.buf, "exit")) {
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@ -22,6 +22,7 @@ void credential_clear(struct credential *c)
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free(c->path);
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free(c->path);
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free(c->username);
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free(c->username);
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free(c->password);
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free(c->password);
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free(c->oauth_refresh_token);
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string_list_clear(&c->helpers, 0);
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string_list_clear(&c->helpers, 0);
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credential_init(c);
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credential_init(c);
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@ -240,6 +241,9 @@ int credential_read(struct credential *c, FILE *fp)
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c->password_expiry_utc = parse_timestamp(value, NULL, 10);
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c->password_expiry_utc = parse_timestamp(value, NULL, 10);
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if (c->password_expiry_utc == 0 || errno == ERANGE)
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if (c->password_expiry_utc == 0 || errno == ERANGE)
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c->password_expiry_utc = TIME_MAX;
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c->password_expiry_utc = TIME_MAX;
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} else if (!strcmp(key, "oauth_refresh_token")) {
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free(c->oauth_refresh_token);
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c->oauth_refresh_token = xstrdup(value);
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} else if (!strcmp(key, "url")) {
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} else if (!strcmp(key, "url")) {
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credential_from_url(c, value);
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credential_from_url(c, value);
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} else if (!strcmp(key, "quit")) {
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} else if (!strcmp(key, "quit")) {
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@ -275,6 +279,7 @@ void credential_write(const struct credential *c, FILE *fp)
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credential_write_item(fp, "path", c->path, 0);
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credential_write_item(fp, "path", c->path, 0);
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credential_write_item(fp, "username", c->username, 0);
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credential_write_item(fp, "username", c->username, 0);
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credential_write_item(fp, "password", c->password, 0);
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credential_write_item(fp, "password", c->password, 0);
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credential_write_item(fp, "oauth_refresh_token", c->oauth_refresh_token, 0);
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if (c->password_expiry_utc != TIME_MAX) {
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if (c->password_expiry_utc != TIME_MAX) {
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char *s = xstrfmt("%"PRItime, c->password_expiry_utc);
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char *s = xstrfmt("%"PRItime, c->password_expiry_utc);
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credential_write_item(fp, "password_expiry_utc", s, 0);
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credential_write_item(fp, "password_expiry_utc", s, 0);
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@ -398,6 +403,7 @@ void credential_reject(struct credential *c)
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FREE_AND_NULL(c->username);
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FREE_AND_NULL(c->username);
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FREE_AND_NULL(c->password);
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FREE_AND_NULL(c->password);
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FREE_AND_NULL(c->oauth_refresh_token);
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c->password_expiry_utc = TIME_MAX;
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c->password_expiry_utc = TIME_MAX;
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c->approved = 0;
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c->approved = 0;
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}
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}
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@ -126,6 +126,7 @@ struct credential {
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char *protocol;
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char *protocol;
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char *host;
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char *host;
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char *path;
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char *path;
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char *oauth_refresh_token;
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timestamp_t password_expiry_utc;
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timestamp_t password_expiry_utc;
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};
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};
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@ -43,6 +43,7 @@ helper_test_clean() {
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reject $1 https example.com store-user
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reject $1 https example.com store-user
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reject $1 https example.com user1
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reject $1 https example.com user1
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reject $1 https example.com user2
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reject $1 https example.com user2
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reject $1 https example.com user4
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reject $1 http path.tld user
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reject $1 http path.tld user
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reject $1 https timeout.tld user
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reject $1 https timeout.tld user
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reject $1 https sso.tld
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reject $1 https sso.tld
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@ -298,6 +299,35 @@ helper_test_timeout() {
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'
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'
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}
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}
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helper_test_oauth_refresh_token() {
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HELPER=$1
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test_expect_success "helper ($HELPER) stores oauth_refresh_token" '
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check approve $HELPER <<-\EOF
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protocol=https
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host=example.com
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username=user4
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password=pass
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oauth_refresh_token=xyzzy
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EOF
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'
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test_expect_success "helper ($HELPER) gets oauth_refresh_token" '
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check fill $HELPER <<-\EOF
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protocol=https
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host=example.com
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username=user4
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--
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protocol=https
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host=example.com
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username=user4
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password=pass
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oauth_refresh_token=xyzzy
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--
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EOF
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'
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}
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write_script askpass <<\EOF
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write_script askpass <<\EOF
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echo >&2 askpass: $*
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echo >&2 askpass: $*
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what=$(echo $1 | cut -d" " -f1 | tr A-Z a-z | tr -cd a-z)
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what=$(echo $1 | cut -d" " -f1 | tr A-Z a-z | tr -cd a-z)
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@ -214,6 +214,24 @@ test_expect_success 'credential_approve stores password expiry' '
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EOF
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EOF
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'
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'
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test_expect_success 'credential_approve stores oauth refresh token' '
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check approve useless <<-\EOF
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protocol=http
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host=example.com
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username=foo
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password=bar
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oauth_refresh_token=xyzzy
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--
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--
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useless: store
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useless: protocol=http
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useless: host=example.com
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useless: username=foo
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useless: password=bar
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useless: oauth_refresh_token=xyzzy
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EOF
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'
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test_expect_success 'do not bother storing password-less credential' '
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test_expect_success 'do not bother storing password-less credential' '
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check approve useless <<-\EOF
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check approve useless <<-\EOF
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protocol=http
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protocol=http
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@ -29,6 +29,7 @@ test_atexit 'git credential-cache exit'
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# test that the daemon works with no special setup
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# test that the daemon works with no special setup
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helper_test cache
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helper_test cache
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helper_test_oauth_refresh_token cache
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test_expect_success 'socket defaults to ~/.cache/git/credential/socket' '
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test_expect_success 'socket defaults to ~/.cache/git/credential/socket' '
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test_when_finished "
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test_when_finished "
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