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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <Security/Security.h>
static SecProtocolType protocol;
static char *host;
static char *path;
static char *username;
static char *password;
static UInt16 port;
__attribute__((format (printf, 1, 2)))
static void die(const char *err, ...)
{
char msg[4096];
va_list params;
va_start(params, err);
vsnprintf(msg, sizeof(msg), err, params);
fprintf(stderr, "%s\n", msg);
va_end(params);
exit(1);
}
static void *xstrdup(const char *s1)
{
void *ret = strdup(s1);
if (!ret)
die("Out of memory");
return ret;
}
#define KEYCHAIN_ITEM(x) (x ? strlen(x) : 0), x
#define KEYCHAIN_ARGS \
NULL, /* default keychain */ \
KEYCHAIN_ITEM(host), \
0, NULL, /* account domain */ \
KEYCHAIN_ITEM(username), \
KEYCHAIN_ITEM(path), \
port, \
protocol, \
kSecAuthenticationTypeDefault
static void write_item(const char *what, const char *buf, int len)
{
printf("%s=", what);
fwrite(buf, 1, len, stdout);
putchar('\n');
}
static void find_username_in_item(SecKeychainItemRef item)
{
SecKeychainAttributeList list;
SecKeychainAttribute attr;
list.count = 1;
list.attr = &attr;
attr.tag = kSecAccountItemAttr;
if (SecKeychainItemCopyContent(item, NULL, &list, NULL, NULL))
return;
write_item("username", attr.data, attr.length);
SecKeychainItemFreeContent(&list, NULL);
}
static void find_internet_password(void)
{
void *buf;
UInt32 len;
SecKeychainItemRef item;
if (SecKeychainFindInternetPassword(KEYCHAIN_ARGS, &len, &buf, &item))
return;
write_item("password", buf, len);
if (!username)
find_username_in_item(item);
SecKeychainItemFreeContent(NULL, buf);
}
static void delete_internet_password(void)
{
SecKeychainItemRef item;
/*
* Require at least a protocol and host for removal, which is what git
* will give us; if you want to do something more fancy, use the
* Keychain manager.
*/
if (!protocol || !host)
return;
if (SecKeychainFindInternetPassword(KEYCHAIN_ARGS, 0, NULL, &item))
return;
SecKeychainItemDelete(item);
}
static void add_internet_password(void)
{
/* Only store complete credentials */
if (!protocol || !host || !username || !password)
return;
if (SecKeychainAddInternetPassword(
KEYCHAIN_ARGS,
KEYCHAIN_ITEM(password),
NULL))
return;
}
static void read_credential(void)
{
char *buf = NULL;
size_t alloc;
ssize_t line_len;
while ((line_len = getline(&buf, &alloc, stdin)) > 0) {
char *v;
if (!strcmp(buf, "\n"))
break;
buf[line_len-1] = '\0';
v = strchr(buf, '=');
if (!v)
die("bad input: %s", buf);
*v++ = '\0';
if (!strcmp(buf, "protocol")) {
if (!strcmp(v, "imap"))
protocol = kSecProtocolTypeIMAP;
else if (!strcmp(v, "imaps"))
protocol = kSecProtocolTypeIMAPS;
else if (!strcmp(v, "ftp"))
protocol = kSecProtocolTypeFTP;
else if (!strcmp(v, "ftps"))
protocol = kSecProtocolTypeFTPS;
else if (!strcmp(v, "https"))
protocol = kSecProtocolTypeHTTPS;
else if (!strcmp(v, "http"))
protocol = kSecProtocolTypeHTTP;
else if (!strcmp(v, "smtp"))
protocol = kSecProtocolTypeSMTP;
else /* we don't yet handle other protocols */
exit(0);
}
else if (!strcmp(buf, "host")) {
char *colon = strchr(v, ':');
if (colon) {
*colon++ = '\0';
port = atoi(colon);
}
host = xstrdup(v);
}
else if (!strcmp(buf, "path"))
path = xstrdup(v);
else if (!strcmp(buf, "username"))
username = xstrdup(v);
else if (!strcmp(buf, "password"))
password = xstrdup(v);
/*
* Ignore other lines; we don't know what they mean, but
* this future-proofs us when later versions of git do
* learn new lines, and the helpers are updated to match.
*/
}
free(buf);
}
int main(int argc, const char **argv)
{
const char *usage =
"usage: git credential-osxkeychain <get|store|erase>";
if (!argv[1])
die("%s", usage);
read_credential();
if (!strcmp(argv[1], "get"))
find_internet_password();
else if (!strcmp(argv[1], "store"))
add_internet_password();
else if (!strcmp(argv[1], "erase"))
delete_internet_password();
/* otherwise, ignore unknown action */
return 0;
}
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