Andrew's git - gitweb.git/blob - credential-store.c

   1#include "cache.h"
   2#include "credential.h"
   3#include "string-list.h"
   4#include "parse-options.h"
   5
   6static struct lock_file credential_lock;
   7
   8static void parse_credential_file(const char *fn,
   9                                  struct credential *c,
  10                                  void (*match_cb)(struct credential *),
  11                                  void (*other_cb)(struct strbuf *))
  12{
  13        FILE *fh;
  14        struct strbuf line = STRBUF_INIT;
  15        struct credential entry = CREDENTIAL_INIT;
  16
  17        fh = fopen(fn, "r");
  18        if (!fh) {
  19                if (errno != ENOENT)
  20                        die_errno("unable to open %s", fn);
  21                return;
  22        }
  23
  24        while (strbuf_getline(&line, fh, '\n') != EOF) {
  25                credential_from_url(&entry, line.buf);
  26                if (entry.username && entry.password &&
  27                    credential_match(c, &entry)) {
  28                        if (match_cb) {
  29                                match_cb(&entry);
  30                                break;
  31                        }
  32                }
  33                else if (other_cb)
  34                        other_cb(&line);
  35        }
  36
  37        credential_clear(&entry);
  38        strbuf_release(&line);
  39        fclose(fh);
  40}
  41
  42static void print_entry(struct credential *c)
  43{
  44        printf("username=%s\n", c->username);
  45        printf("password=%s\n", c->password);
  46}
  47
  48static void print_line(struct strbuf *buf)
  49{
  50        strbuf_addch(buf, '\n');
  51        write_or_die(credential_lock.fd, buf->buf, buf->len);
  52}
  53
  54static void rewrite_credential_file(const char *fn, struct credential *c,
  55                                    struct strbuf *extra)
  56{
  57        if (hold_lock_file_for_update(&credential_lock, fn, 0) < 0)
  58                die_errno("unable to get credential storage lock");
  59        if (extra)
  60                print_line(extra);
  61        parse_credential_file(fn, c, NULL, print_line);
  62        if (commit_lock_file(&credential_lock) < 0)
  63                die_errno("unable to commit credential store");
  64}
  65
  66static void store_credential(const char *fn, struct credential *c)
  67{
  68        struct strbuf buf = STRBUF_INIT;
  69
  70        /*
  71         * Sanity check that what we are storing is actually sensible.
  72         * In particular, we can't make a URL without a protocol field.
  73         * Without either a host or pathname (depending on the scheme),
  74         * we have no primary key. And without a username and password,
  75         * we are not actually storing a credential.
  76         */
  77        if (!c->protocol || !(c->host || c->path) ||
  78            !c->username || !c->password)
  79                return;
  80
  81        strbuf_addf(&buf, "%s://", c->protocol);
  82        strbuf_addstr_urlencode(&buf, c->username, 1);
  83        strbuf_addch(&buf, ':');
  84        strbuf_addstr_urlencode(&buf, c->password, 1);
  85        strbuf_addch(&buf, '@');
  86        if (c->host)
  87                strbuf_addstr_urlencode(&buf, c->host, 1);
  88        if (c->path) {
  89                strbuf_addch(&buf, '/');
  90                strbuf_addstr_urlencode(&buf, c->path, 0);
  91        }
  92
  93        rewrite_credential_file(fn, c, &buf);
  94        strbuf_release(&buf);
  95}
  96
  97static void remove_credential(const char *fn, struct credential *c)
  98{
  99        /*
 100         * Sanity check that we actually have something to match
 101         * against. The input we get is a restrictive pattern,
 102         * so technically a blank credential means "erase everything".
 103         * But it is too easy to accidentally send this, since it is equivalent
 104         * to empty input. So explicitly disallow it, and require that the
 105         * pattern have some actual content to match.
 106         */
 107        if (c->protocol || c->host || c->path || c->username)
 108                rewrite_credential_file(fn, c, NULL);
 109}
 110
 111static int lookup_credential(const char *fn, struct credential *c)
 112{
 113        parse_credential_file(fn, c, print_entry, NULL);
 114        return c->username && c->password;
 115}
 116
 117int main(int argc, const char **argv)
 118{
 119        const char * const usage[] = {
 120                "git credential-store [options] <action>",
 121                NULL
 122        };
 123        const char *op;
 124        struct credential c = CREDENTIAL_INIT;
 125        char *file = NULL;
 126        struct option options[] = {
 127                OPT_STRING(0, "file", &file, "path",
 128                           "fetch and store credentials in <path>"),
 129                OPT_END()
 130        };
 131
 132        umask(077);
 133
 134        argc = parse_options(argc, argv, NULL, options, usage, 0);
 135        if (argc != 1)
 136                usage_with_options(usage, options);
 137        op = argv[0];
 138
 139        if (!file)
 140                file = expand_user_path("~/.git-credentials");
 141        if (!file)
 142                die("unable to set up default path; use --file");
 143
 144        if (credential_read(&c, stdin) < 0)
 145                die("unable to read credential");
 146
 147        if (!strcmp(op, "get"))
 148                lookup_credential(file, &c);
 149        else if (!strcmp(op, "erase"))
 150                remove_credential(file, &c);
 151        else if (!strcmp(op, "store"))
 152                store_credential(file, &c);
 153        else
 154                ; /* Ignore unknown operation. */
 155
 156        return 0;
 157}