From: M Hickford <mirth.hickford@xxxxxxxxx>
a5c7656 (credential: new attribute oauth_refresh_token) introduced
a new confidential credential attribute for helpers to store.
We encode the new attribute in the CredentialBlob, separated by
newline:
hunter2
oauth_refresh_token=xyzzy
This is extensible and backwards compatible. The credential protocol
already assumes that attribute values do not contain newlines.
Alternatives considered: store oauth_refresh_token in a wincred
attribute. This would be insecure because wincred assumes attribute
values to be non-confidential.
Signed-off-by: M Hickford <mirth.hickford@xxxxxxxxx>
---
credential/wincred: store oauth_refresh_token
I'm not confident in C and found string manipulation difficult, so
please review carefully.
I tested on Linux, cross compiling with Zig make CC="zig cc -target
x86_64-windows-gnu" and tested make GIT_TEST_CREDENTIAL_HELPER=wincred
t0303-credential-external.sh (with a shell script git-credential-wincred
that wraps wine64 git-credential-wincred.exe "$@")
See also similar patch for credential-libsecret "[PATCH v4]
credential/libsecret: store new attributes"
https://lore.kernel.org/git/pull.1469.v4.git.git.1684306540947.gitgitgadget@xxxxxxxxx/T/#u
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1534%2Fhickford%2Fwincred-refresh-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1534/hickford/wincred-refresh-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1534
.../wincred/git-credential-wincred.c | 40 ++++++++++++++++---
t/t0303-credential-external.sh | 1 +
2 files changed, 35 insertions(+), 6 deletions(-)
diff --git a/contrib/credential/wincred/git-credential-wincred.c b/contrib/credential/wincred/git-credential-wincred.c
index 96f10613aee..dc34283b85e 100644
--- a/contrib/credential/wincred/git-credential-wincred.c
+++ b/contrib/credential/wincred/git-credential-wincred.c
@@ -35,7 +35,7 @@ static void *xmalloc(size_t size)
}
static WCHAR *wusername, *password, *protocol, *host, *path, target[1024],
- *password_expiry_utc;
+ *password_expiry_utc, *oauth_refresh_token;
static void write_item(const char *what, LPCWSTR wbuf, int wlen)
{
@@ -128,6 +128,11 @@ static void get_credential(void)
DWORD num_creds;
int i;
CREDENTIAL_ATTRIBUTEW *attr;
+ WCHAR *secret;
+ WCHAR *line;
+ WCHAR *remaining_lines;
+ WCHAR *part;
+ WCHAR *remaining_parts;
if (!CredEnumerateW(L"git:*", 0, &num_creds, &creds))
return;
@@ -137,9 +142,17 @@ static void get_credential(void)
if (match_cred(creds[i])) {
write_item("username", creds[i]->UserName,
creds[i]->UserName ? wcslen(creds[i]->UserName) : 0);
- write_item("password",
- (LPCWSTR)creds[i]->CredentialBlob,
- creds[i]->CredentialBlobSize / sizeof(WCHAR));
+ secret = xmalloc(creds[i]->CredentialBlobSize);
+ wcsncpy_s(secret, creds[i]->CredentialBlobSize, (LPCWSTR)creds[i]->CredentialBlob, creds[i]->CredentialBlobSize / sizeof(WCHAR));
+ line = wcstok_s(secret, L"\r\n", &remaining_lines);
+ write_item("password", line, wcslen(line));
+ while(line != NULL) {
+ part = wcstok_s(line, L"=", &remaining_parts);
+ if (!wcscmp(part, L"oauth_refresh_token")) {
+ write_item("oauth_refresh_token", remaining_parts, wcslen(remaining_parts));
+ }
+ line = wcstok_s(NULL, L"\r\n", &remaining_lines);
+ }
for (int j = 0; j < creds[i]->AttributeCount; j++) {
attr = creds[i]->Attributes + j;
if (!wcscmp(attr->Keyword, L"git_password_expiry_utc")) {
@@ -148,6 +161,7 @@ static void get_credential(void)
break;
}
}
+ free(secret);
break;
}
@@ -158,16 +172,26 @@ static void store_credential(void)
{
CREDENTIALW cred;
CREDENTIAL_ATTRIBUTEW expiry_attr;
+ WCHAR *secret;
+ int wlen;
if (!wusername || !password)
return;
+ if (oauth_refresh_token) {
+ wlen = _scwprintf(L"%s\r\noauth_refresh_token=%s", password, oauth_refresh_token);
+ secret = xmalloc(sizeof(WCHAR) * wlen);
+ _snwprintf_s(secret, sizeof(WCHAR) * wlen, wlen, L"%s\r\noauth_refresh_token=%s", password, oauth_refresh_token);
+ } else {
+ secret = _wcsdup(password);
+ }
+
cred.Flags = 0;
cred.Type = CRED_TYPE_GENERIC;
cred.TargetName = target;
cred.Comment = L"saved by git-credential-wincred";
- cred.CredentialBlobSize = (wcslen(password)) * sizeof(WCHAR);
- cred.CredentialBlob = (LPVOID)password;
+ cred.CredentialBlobSize = wcslen(secret) * sizeof(WCHAR);
+ cred.CredentialBlob = (LPVOID)_wcsdup(secret);
cred.Persist = CRED_PERSIST_LOCAL_MACHINE;
cred.AttributeCount = 0;
cred.Attributes = NULL;
@@ -182,6 +206,8 @@ static void store_credential(void)
cred.TargetAlias = NULL;
cred.UserName = wusername;
+ free(secret);
+
if (!CredWriteW(&cred, 0))
die("CredWrite failed");
}
@@ -253,6 +279,8 @@ static void read_credential(void)
password = utf8_to_utf16_dup(v);
else if (!strcmp(buf, "password_expiry_utc"))
password_expiry_utc = utf8_to_utf16_dup(v);
+ else if (!strcmp(buf, "oauth_refresh_token"))
+ oauth_refresh_token = utf8_to_utf16_dup(v);
/*
* Ignore other lines; we don't know what they mean, but
* this future-proofs us when later versions of git do
diff --git a/t/t0303-credential-external.sh b/t/t0303-credential-external.sh
index f028fd14182..51886b8e259 100755
--- a/t/t0303-credential-external.sh
+++ b/t/t0303-credential-external.sh
@@ -45,6 +45,7 @@ test -z "$GIT_TEST_CREDENTIAL_HELPER_SETUP" ||
helper_test_clean "$GIT_TEST_CREDENTIAL_HELPER"
helper_test "$GIT_TEST_CREDENTIAL_HELPER"
+helper_test_oauth_refresh_token "$GIT_TEST_CREDENTIAL_HELPER"
if test -z "$GIT_TEST_CREDENTIAL_HELPER_TIMEOUT"; then
say "# skipping timeout tests (GIT_TEST_CREDENTIAL_HELPER_TIMEOUT not set)"
base-commit: 9e49351c3060e1fa6e0d2de64505b7becf157f28
--
gitgitgadget
