On Sat, 20 May 2023 at 08:20, M Hickford via GitGitGadget <gitgitgadget@xxxxxxxxx> wrote: > > 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 Hi. Is anyone familiar enough with Windows CRT to review this patch?
