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git/credential.c
Matthieu Moy 2d6dc182b8 git credential fill: output the whole 'struct credential'
Instead of outputing only the username and password, print all the
attributes, even those that already appeared in the input.

This is closer to what the C API does, and allows one to take the exact
output of "git credential fill" as input to "git credential approve" or
"git credential reject".

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-06-25 11:56:24 -07:00

365 lines
7.5 KiB
C

#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);
}
/*
* 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';
}
}