#include "cache.h" #include "config.h" #include "credential.h" #include "string-list.h" #include "run-command.h" #include "url.h" #include "prompt.h" #include "sigchain.h" #include "urlmatch.h" void credential_init(struct credential *c) { struct credential blank = CREDENTIAL_INIT; memcpy(c, &blank, sizeof(*c)); } 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_from_potentially_partial_url(struct credential *c, const char *url); static int credential_config_callback(const char *var, const char *value, void *data) { struct credential *c = data; const char *key; if (!skip_prefix(var, "credential.", &key)) return 0; if (!value) return config_error_nonbool(var); if (!strcmp(key, "helper")) { if (*value) string_list_append(&c->helpers, value); else string_list_clear(&c->helpers, 0); } else if (!strcmp(key, "username")) { if (!c->username_from_proto) { free(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_describe(struct credential *c, struct strbuf *out); static void credential_format(struct credential *c, struct strbuf *out); static int select_all(const struct urlmatch_item *a, const struct urlmatch_item *b) { return 0; } static int match_partial_url(const char *url, void *cb) { struct credential *c = cb; struct credential want = CREDENTIAL_INIT; int matches = 0; if (credential_from_potentially_partial_url(&want, url) < 0) warning(_("skipping credential lookup for key: credential.%s"), url); else matches = credential_match(&want, c); credential_clear(&want); return matches; } static void credential_apply_config(struct credential *c) { char *normalized_url; struct urlmatch_config config = { STRING_LIST_INIT_DUP }; struct strbuf url = STRBUF_INIT; if (!c->host) die(_("refusing to work with credential missing host field")); if (!c->protocol) die(_("refusing to work with credential missing protocol field")); if (c->configured) return; config.section = "credential"; config.key = NULL; config.collect_fn = credential_config_callback; config.cascade_fn = NULL; config.select_fn = select_all; config.fallback_match_fn = match_partial_url; config.cb = c; credential_format(c, &url); normalized_url = url_normalize(url.buf, &config.url); git_config(urlmatch_config_entry, &config); free(normalized_url); strbuf_release(&url); c->configured = 1; if (!c->use_http_path && proto_is_http(c->protocol)) { FREE_AND_NULL(c->path); } } 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 void credential_format(struct credential *c, struct strbuf *out) { if (!c->protocol) return; strbuf_addf(out, "%s://", c->protocol); if (c->username && *c->username) { strbuf_add_percentencode(out, c->username, STRBUF_ENCODE_SLASH); strbuf_addch(out, '@'); } if (c->host) strbuf_addstr(out, c->host); if (c->path) { strbuf_addch(out, '/'); strbuf_add_percentencode(out, c->path, 0); } } 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) != 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); c->username_from_proto = 1; } 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); } else if (!strcmp(key, "quit")) { c->quit = !!git_config_bool("quit", 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, int required) { if (!value && required) BUG("credential value for %s is missing", key); if (!value) return; if (strchr(value, '\n')) die("credential value for %s contains newline", key); fprintf(fp, "%s=%s\n", key, value); } void credential_write(const struct credential *c, FILE *fp) { credential_write_item(fp, "protocol", c->protocol, 1); credential_write_item(fp, "host", c->host, 1); credential_write_item(fp, "path", c->path, 0); credential_write_item(fp, "username", c->username, 0); credential_write_item(fp, "password", c->password, 0); } static int run_credential_helper(struct credential *c, const char *cmd, int want_output) { struct child_process helper = CHILD_PROCESS_INIT; FILE *fp; strvec_push(&helper.args, cmd); 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"); sigchain_push(SIGPIPE, SIG_IGN); credential_write(c, fp); fclose(fp); sigchain_pop(SIGPIPE); 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; if (c->quit) die("credential helper '%s' told us to quit", c->helpers.items[i].string); } 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_AND_NULL(c->username); FREE_AND_NULL(c->password); c->approved = 0; } static int check_url_component(const char *url, int quiet, const char *name, const char *value) { if (!value) return 0; if (!strchr(value, '\n')) return 0; if (!quiet) warning(_("url contains a newline in its %s component: %s"), name, url); return -1; } /* * Potentially-partial URLs can, but do not have to, contain * * - a protocol (or scheme) of the form "<protocol>://" * * - a host name (the part after the protocol and before the first slash after * that, if any) * * - a user name and potentially a password (as "<user>[:<password>]@" part of * the host name) * * - a path (the part after the host name, if any, starting with the slash) * * Missing parts will be left unset in `struct credential`. Thus, `https://` * will have only the `protocol` set, `example.com` only the host name, and * `/git` only the path. * * Note that an empty host name in an otherwise fully-qualified URL (e.g. * `cert:///path/to/cert.pem`) will be treated as unset if we expect the URL to * be potentially partial, and only then (otherwise, the empty string is used). * * The credential_from_url() function does not allow partial URLs. */ static int credential_from_url_1(struct credential *c, const char *url, int allow_partial_url, int quiet) { 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 (!allow_partial_url && (!proto_end || proto_end == url)) { if (!quiet) warning(_("url has no scheme: %s"), url); return -1; } cp = proto_end ? proto_end + 3 : url; at = strchr(cp, '@'); colon = strchr(cp, ':'); /* * A query or fragment marker before the slash ends the host portion. * We'll just continue to call this "slash" for simplicity. Notably our * "trim leading slashes" part won't skip over this part of the path, * but that's what we'd want. */ slash = cp + strcspn(cp, "/?#"); if (!at || slash <= at) { /* Case (1) */ host = cp; } else if (!colon || at <= colon) { /* Case (2) */ c->username = url_decode_mem(cp, at - cp); if (c->username && *c->username) c->username_from_proto = 1; host = at + 1; } else { /* Case (3) */ c->username = url_decode_mem(cp, colon - cp); if (c->username && *c->username) c->username_from_proto = 1; c->password = url_decode_mem(colon + 1, at - (colon + 1)); host = at + 1; } if (proto_end && proto_end - url > 0) c->protocol = xmemdupz(url, proto_end - url); if (!allow_partial_url || 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'; } if (check_url_component(url, quiet, "username", c->username) < 0 || check_url_component(url, quiet, "password", c->password) < 0 || check_url_component(url, quiet, "protocol", c->protocol) < 0 || check_url_component(url, quiet, "host", c->host) < 0 || check_url_component(url, quiet, "path", c->path) < 0) return -1; return 0; } static int credential_from_potentially_partial_url(struct credential *c, const char *url) { return credential_from_url_1(c, url, 1, 0); } int credential_from_url_gently(struct credential *c, const char *url, int quiet) { return credential_from_url_1(c, url, 0, quiet); } void credential_from_url(struct credential *c, const char *url) { if (credential_from_url_gently(c, url, 0) < 0) die(_("credential url cannot be parsed: %s"), url); }