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tag: v1.7.12-rc2
Jeff King July 18, 2012
file 368 lines (309 sloc) 7.756 kb
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#include "cache.h"
#include "credential.h"
#include "string-list.h"
#include "run-command.h"
#include "url.h"
#include "prompt.h"

void credential_init(struct credential *c)
{
memset(c, 0, sizeof(*c));
c->helpers.strdup_strings = 1;
}

void credential_clear(struct credential *c)
{
free(c->protocol);
free(c->host);
free(c->path);
free(c->username);
free(c->password);
string_list_clear(&c->helpers, 0);

credential_init(c);
}

int credential_match(const struct credential *want,
const struct credential *have)
{
#define CHECK(x) (!want->x || (have->x && !strcmp(want->x, have->x)))
return CHECK(protocol) &&
CHECK(host) &&
CHECK(path) &&
CHECK(username);
#undef CHECK
}

static int credential_config_callback(const char *var, const char *value,
void *data)
{
struct credential *c = data;
const char *key, *dot;

key = skip_prefix(var, "credential.");
if (!key)
return 0;

if (!value)
return config_error_nonbool(var);

dot = strrchr(key, '.');
if (dot) {
struct credential want = CREDENTIAL_INIT;
char *url = xmemdupz(key, dot - key);
int matched;

credential_from_url(&want, url);
matched = credential_match(&want, c);

credential_clear(&want);
free(url);

if (!matched)
return 0;
key = dot + 1;
}

if (!strcmp(key, "helper"))
string_list_append(&c->helpers, value);
else if (!strcmp(key, "username")) {
if (!c->username)
c->username = xstrdup(value);
}
else if (!strcmp(key, "usehttppath"))
c->use_http_path = git_config_bool(var, value);

return 0;
}

static int proto_is_http(const char *s)
{
if (!s)
return 0;
return !strcmp(s, "https") || !strcmp(s, "http");
}

static void credential_apply_config(struct credential *c)
{
if (c->configured)
return;
git_config(credential_config_callback, c);
c->configured = 1;

if (!c->use_http_path && proto_is_http(c->protocol)) {
free(c->path);
c->path = NULL;
}
}

static void credential_describe(struct credential *c, struct strbuf *out)
{
if (!c->protocol)
return;
strbuf_addf(out, "%s://", c->protocol);
if (c->username && *c->username)
strbuf_addf(out, "%s@", c->username);
if (c->host)
strbuf_addstr(out, c->host);
if (c->path)
strbuf_addf(out, "/%s", c->path);
}

static char *credential_ask_one(const char *what, struct credential *c,
int flags)
{
struct strbuf desc = STRBUF_INIT;
struct strbuf prompt = STRBUF_INIT;
char *r;

credential_describe(c, &desc);
if (desc.len)
strbuf_addf(&prompt, "%s for '%s': ", what, desc.buf);
else
strbuf_addf(&prompt, "%s: ", what);

r = git_prompt(prompt.buf, flags);

strbuf_release(&desc);
strbuf_release(&prompt);
return xstrdup(r);
}

static void credential_getpass(struct credential *c)
{
if (!c->username)
c->username = credential_ask_one("Username", c,
PROMPT_ASKPASS|PROMPT_ECHO);
if (!c->password)
c->password = credential_ask_one("Password", c,
PROMPT_ASKPASS);
}

int credential_read(struct credential *c, FILE *fp)
{
struct strbuf line = STRBUF_INIT;

while (strbuf_getline(&line, fp, '\n') != EOF) {
char *key = line.buf;
char *value = strchr(key, '=');

if (!line.len)
break;

if (!value) {
warning("invalid credential line: %s", key);
strbuf_release(&line);
return -1;
}
*value++ = '\0';

if (!strcmp(key, "username")) {
free(c->username);
c->username = xstrdup(value);
} else if (!strcmp(key, "password")) {
free(c->password);
c->password = xstrdup(value);
} else if (!strcmp(key, "protocol")) {
free(c->protocol);
c->protocol = xstrdup(value);
} else if (!strcmp(key, "host")) {
free(c->host);
c->host = xstrdup(value);
} else if (!strcmp(key, "path")) {
free(c->path);
c->path = xstrdup(value);
} else if (!strcmp(key, "url")) {
credential_from_url(c, value);
}
/*
* 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.
*/
}

strbuf_release(&line);
return 0;
}

static void credential_write_item(FILE *fp, const char *key, const char *value)
{
if (!value)
return;
fprintf(fp, "%s=%s\n", key, value);
}

void credential_write(const struct credential *c, FILE *fp)
{
credential_write_item(fp, "protocol", c->protocol);
credential_write_item(fp, "host", c->host);
credential_write_item(fp, "path", c->path);
credential_write_item(fp, "username", c->username);
credential_write_item(fp, "password", c->password);
}

static int run_credential_helper(struct credential *c,
const char *cmd,
int want_output)
{
struct child_process helper;
const char *argv[] = { NULL, NULL };
FILE *fp;

memset(&helper, 0, sizeof(helper));
argv[0] = cmd;
helper.argv = argv;
helper.use_shell = 1;
helper.in = -1;
if (want_output)
helper.out = -1;
else
helper.no_stdout = 1;

if (start_command(&helper) < 0)
return -1;

fp = xfdopen(helper.in, "w");
credential_write(c, fp);
fclose(fp);

if (want_output) {
int r;
fp = xfdopen(helper.out, "r");
r = credential_read(c, fp);
fclose(fp);
if (r < 0) {
finish_command(&helper);
return -1;
}
}

if (finish_command(&helper))
return -1;
return 0;
}

static int credential_do(struct credential *c, const char *helper,
const char *operation)
{
struct strbuf cmd = STRBUF_INIT;
int r;

if (helper[0] == '!')
strbuf_addstr(&cmd, helper + 1);
else if (is_absolute_path(helper))
strbuf_addstr(&cmd, helper);
else
strbuf_addf(&cmd, "git credential-%s", helper);

strbuf_addf(&cmd, " %s", operation);
r = run_credential_helper(c, cmd.buf, !strcmp(operation, "get"));

strbuf_release(&cmd);
return r;
}

void credential_fill(struct credential *c)
{
int i;

if (c->username && c->password)
return;

credential_apply_config(c);

for (i = 0; i < c->helpers.nr; i++) {
credential_do(c, c->helpers.items[i].string, "get");
if (c->username && c->password)
return;
}

credential_getpass(c);
if (!c->username && !c->password)
die("unable to get password from user");
}

void credential_approve(struct credential *c)
{
int i;

if (c->approved)
return;
if (!c->username || !c->password)
return;

credential_apply_config(c);

for (i = 0; i < c->helpers.nr; i++)
credential_do(c, c->helpers.items[i].string, "store");
c->approved = 1;
}

void credential_reject(struct credential *c)
{
int i;

credential_apply_config(c);

for (i = 0; i < c->helpers.nr; i++)
credential_do(c, c->helpers.items[i].string, "erase");

free(c->username);
c->username = NULL;
free(c->password);
c->password = NULL;
c->approved = 0;
}

void credential_from_url(struct credential *c, const char *url)
{
const char *at, *colon, *cp, *slash, *host, *proto_end;

credential_clear(c);

/*
* Match one of:
* (1) proto://<host>/...
* (2) proto://<user>@<host>/...
* (3) proto://<user>:<pass>@<host>/...
*/
proto_end = strstr(url, "://");
if (!proto_end)
return;
cp = proto_end + 3;
at = strchr(cp, '@');
colon = strchr(cp, ':');
slash = strchrnul(cp, '/');

if (!at || slash <= at) {
/* Case (1) */
host = cp;
}
else if (!colon || at <= colon) {
/* Case (2) */
c->username = url_decode_mem(cp, at - cp);
host = at + 1;
} else {
/* Case (3) */
c->username = url_decode_mem(cp, colon - cp);
c->password = url_decode_mem(colon + 1, at - (colon + 1));
host = at + 1;
}

if (proto_end - url > 0)
c->protocol = xmemdupz(url, proto_end - url);
if (slash - host > 0)
c->host = url_decode_mem(host, slash - host);
/* Trim leading and trailing slashes from path */
while (*slash == '/')
slash++;
if (*slash) {
char *p;
c->path = url_decode(slash);
p = c->path + strlen(c->path) - 1;
while (p > c->path && *p == '/')
*p-- = '\0';
}
}
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