From 30261094b1f7fdcba3b7a1f396e43891cd998149 Mon Sep 17 00:00:00 2001 From: Dave Borowitz Date: Wed, 19 Aug 2015 11:26:46 -0400 Subject: [PATCH] push: support signing pushes iff the server supports it Add a new flag --sign=true (or --sign=false), which means the same thing as the original --signed (or --no-signed). Give it a third value --sign=if-asked to tell push and send-pack to send a push certificate if and only if the server advertised a push cert nonce. If not, warn the user that their push may not be as secure as they thought. Signed-off-by: Dave Borowitz Signed-off-by: Junio C Hamano --- Documentation/git-push.txt | 17 +++++++------ Documentation/git-send-pack.txt | 16 +++++++----- builtin/push.c | 20 ++++++++++++++- builtin/send-pack.c | 6 +++-- remote-curl.c | 16 ++++++++---- send-pack.c | 43 +++++++++++++++++++++++++++------ send-pack.h | 12 ++++++++- transport-helper.c | 34 +++++++++++++------------- transport.c | 8 +++++- transport.h | 5 ++-- 10 files changed, 128 insertions(+), 49 deletions(-) diff --git a/Documentation/git-push.txt b/Documentation/git-push.txt index da0a98d58c..1495e3416c 100644 --- a/Documentation/git-push.txt +++ b/Documentation/git-push.txt @@ -11,7 +11,8 @@ SYNOPSIS [verse] 'git push' [--all | --mirror | --tags] [--follow-tags] [--atomic] [-n | --dry-run] [--receive-pack=] [--repo=] [-f | --force] [--prune] [-v | --verbose] - [-u | --set-upstream] [--signed] + [-u | --set-upstream] + [--[no-]signed|--sign=(true|false|if-asked)] [--force-with-lease[=[:]]] [--no-verify] [ [...]] @@ -132,14 +133,16 @@ already exists on the remote side. with configuration variable 'push.followTags'. For more information, see 'push.followTags' in linkgit:git-config[1]. - ---signed:: +--[no-]signed:: +--sign=(true|false|if-asked):: GPG-sign the push request to update refs on the receiving side, to allow it to be checked by the hooks and/or be - logged. See linkgit:git-receive-pack[1] for the details - on the receiving end. If the attempt to sign with `gpg` fails, - or if the server does not support signed pushes, the push will - fail. + logged. If `false` or `--no-signed`, no signing will be + attempted. If `true` or `--signed`, the push will fail if the + server does not support signed pushes. If set to `if-asked`, + sign if and only if the server supports signed pushes. The push + will also fail if the actual call to `gpg --sign` fails. See + linkgit:git-receive-pack[1] for the details on the receiving end. --[no-]atomic:: Use an atomic transaction on the remote side if available. diff --git a/Documentation/git-send-pack.txt b/Documentation/git-send-pack.txt index 0a0a3fbf90..6aa91e830c 100644 --- a/Documentation/git-send-pack.txt +++ b/Documentation/git-send-pack.txt @@ -10,7 +10,8 @@ SYNOPSIS -------- [verse] 'git send-pack' [--all] [--dry-run] [--force] [--receive-pack=] - [--verbose] [--thin] [--atomic] [--signed] + [--verbose] [--thin] [--atomic] + [--[no-]signed|--sign=(true|false|if-asked)] [:] [...] DESCRIPTION @@ -69,13 +70,16 @@ be in a separate packet, and the list must end with a flush packet. fails to update then the entire push will fail without changing any refs. ---signed:: +--[no-]signed:: +--sign=(true|false|if-asked):: GPG-sign the push request to update refs on the receiving side, to allow it to be checked by the hooks and/or be - logged. See linkgit:git-receive-pack[1] for the details - on the receiving end. If the attempt to sign with `gpg` fails, - or if the server does not support signed pushes, the push will - fail. + logged. If `false` or `--no-signed`, no signing will be + attempted. If `true` or `--signed`, the push will fail if the + server does not support signed pushes. If set to `if-asked`, + sign if and only if the server supports signed pushes. The push + will also fail if the actual call to `gpg --sign` fails. See + linkgit:git-receive-pack[1] for the details on the receiving end. :: A remote host to house the repository. When this diff --git a/builtin/push.c b/builtin/push.c index 57c138bd7b..85a82cd21d 100644 --- a/builtin/push.c +++ b/builtin/push.c @@ -9,6 +9,7 @@ #include "transport.h" #include "parse-options.h" #include "submodule.h" +#include "send-pack.h" static const char * const push_usage[] = { N_("git push [] [ [...]]"), @@ -495,6 +496,7 @@ int cmd_push(int argc, const char **argv, const char *prefix) { int flags = 0; int tags = 0; + int push_cert = -1; int rc; const char *repo = NULL; /* default repository */ struct option options[] = { @@ -526,7 +528,9 @@ int cmd_push(int argc, const char **argv, const char *prefix) OPT_BIT(0, "no-verify", &flags, N_("bypass pre-push hook"), TRANSPORT_PUSH_NO_HOOK), OPT_BIT(0, "follow-tags", &flags, N_("push missing but relevant tags"), TRANSPORT_PUSH_FOLLOW_TAGS), - OPT_BIT(0, "signed", &flags, N_("GPG sign the push"), TRANSPORT_PUSH_CERT), + { OPTION_CALLBACK, + 0, "signed", &push_cert, "yes|no|if-asked", N_("GPG sign the push"), + PARSE_OPT_OPTARG, option_parse_push_signed }, OPT_BIT(0, "atomic", &flags, N_("request atomic transaction on remote side"), TRANSPORT_PUSH_ATOMIC), OPT_END() }; @@ -548,6 +552,20 @@ int cmd_push(int argc, const char **argv, const char *prefix) set_refspecs(argv + 1, argc - 1, repo); } + switch (push_cert) { + case SEND_PACK_PUSH_CERT_NEVER: + flags &= ~(TRANSPORT_PUSH_CERT_ALWAYS | TRANSPORT_PUSH_CERT_IF_ASKED); + break; + case SEND_PACK_PUSH_CERT_ALWAYS: + flags |= TRANSPORT_PUSH_CERT_ALWAYS; + flags &= ~TRANSPORT_PUSH_CERT_IF_ASKED; + break; + case SEND_PACK_PUSH_CERT_IF_ASKED: + flags |= TRANSPORT_PUSH_CERT_IF_ASKED; + flags &= ~TRANSPORT_PUSH_CERT_ALWAYS; + break; + } + rc = do_push(repo, flags); if (rc == -1) usage_with_options(push_usage, options); diff --git a/builtin/send-pack.c b/builtin/send-pack.c index 5f2c7441f3..0ce3bc8c41 100644 --- a/builtin/send-pack.c +++ b/builtin/send-pack.c @@ -118,7 +118,7 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix) unsigned send_mirror = 0; unsigned force_update = 0; unsigned quiet = 0; - unsigned push_cert = 0; + int push_cert = 0; unsigned use_thin_pack = 0; unsigned atomic = 0; unsigned stateless_rpc = 0; @@ -137,7 +137,9 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix) OPT_BOOL('n' , "dry-run", &dry_run, N_("dry run")), OPT_BOOL(0, "mirror", &send_mirror, N_("mirror all refs")), OPT_BOOL('f', "force", &force_update, N_("force updates")), - OPT_BOOL(0, "signed", &push_cert, N_("GPG sign the push")), + { OPTION_CALLBACK, + 0, "signed", &push_cert, "yes|no|if-asked", N_("GPG sign the push"), + PARSE_OPT_OPTARG, option_parse_push_signed }, OPT_BOOL(0, "progress", &progress, N_("force progress reporting")), OPT_BOOL(0, "thin", &use_thin_pack, N_("use thin pack")), OPT_BOOL(0, "atomic", &atomic, N_("request atomic transaction on remote side")), diff --git a/remote-curl.c b/remote-curl.c index af7b6786dc..71fbbb694f 100644 --- a/remote-curl.c +++ b/remote-curl.c @@ -11,6 +11,7 @@ #include "argv-array.h" #include "credential.h" #include "sha1-array.h" +#include "send-pack.h" static struct remote *remote; /* always ends with a trailing slash */ @@ -26,7 +27,8 @@ struct options { followtags : 1, dry_run : 1, thin : 1, - push_cert : 1; + /* One of the SEND_PACK_PUSH_CERT_* constants. */ + push_cert : 2; }; static struct options options; static struct string_list cas_options = STRING_LIST_INIT_DUP; @@ -109,9 +111,11 @@ static int set_option(const char *name, const char *value) return 0; } else if (!strcmp(name, "pushcert")) { if (!strcmp(value, "true")) - options.push_cert = 1; + options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS; else if (!strcmp(value, "false")) - options.push_cert = 0; + options.push_cert = SEND_PACK_PUSH_CERT_NEVER; + else if (!strcmp(value, "if-asked")) + options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED; else return -1; return 0; @@ -880,8 +884,10 @@ static int push_git(struct discovery *heads, int nr_spec, char **specs) argv_array_push(&args, "--thin"); if (options.dry_run) argv_array_push(&args, "--dry-run"); - if (options.push_cert) - argv_array_push(&args, "--signed"); + if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS) + argv_array_push(&args, "--signed=yes"); + else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) + argv_array_push(&args, "--signed=if-asked"); if (options.verbosity == 0) argv_array_push(&args, "--quiet"); else if (options.verbosity > 1) diff --git a/send-pack.c b/send-pack.c index 2e07ac3339..f5bc098b39 100644 --- a/send-pack.c +++ b/send-pack.c @@ -12,6 +12,29 @@ #include "version.h" #include "sha1-array.h" #include "gpg-interface.h" +#include "cache.h" + +int option_parse_push_signed(const struct option *opt, + const char *arg, int unset) +{ + if (unset) { + *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER; + return 0; + } + switch (git_parse_maybe_bool(arg)) { + case 1: + *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS; + return 0; + case 0: + *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER; + return 0; + } + if (!strcasecmp("if-asked", arg)) { + *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED; + return 0; + } + die("bad %s argument: %s", opt->long_name, arg); +} static int feed_object(const unsigned char *sha1, int fd, int negative) { @@ -370,14 +393,20 @@ int send_pack(struct send_pack_args *args, args->use_thin_pack = 0; if (server_supports("atomic")) atomic_supported = 1; - if (args->push_cert) { - int len; + if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) { + int len; push_cert_nonce = server_feature_value("push-cert", &len); - if (!push_cert_nonce) + if (push_cert_nonce) { + reject_invalid_nonce(push_cert_nonce, len); + push_cert_nonce = xmemdupz(push_cert_nonce, len); + } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) { die(_("the receiving end does not support --signed push")); - reject_invalid_nonce(push_cert_nonce, len); - push_cert_nonce = xmemdupz(push_cert_nonce, len); + } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) { + warning(_("not sending a push certificate since the" + " receiving end does not support --signed" + " push")); + } } if (!remote_refs) { @@ -413,7 +442,7 @@ int send_pack(struct send_pack_args *args, if (!args->dry_run) advertise_shallow_grafts_buf(&req_buf); - if (!args->dry_run && args->push_cert) + if (!args->dry_run && push_cert_nonce) cmds_sent = generate_push_cert(&req_buf, remote_refs, args, cap_buf.buf, push_cert_nonce); @@ -452,7 +481,7 @@ int send_pack(struct send_pack_args *args, for (ref = remote_refs; ref; ref = ref->next) { char *old_hex, *new_hex; - if (args->dry_run || args->push_cert) + if (args->dry_run || push_cert_nonce) continue; if (check_to_send_update(ref, args) < 0) diff --git a/send-pack.h b/send-pack.h index b6646488aa..57f222abcc 100644 --- a/send-pack.h +++ b/send-pack.h @@ -1,6 +1,11 @@ #ifndef SEND_PACK_H #define SEND_PACK_H +/* Possible values for push_cert field in send_pack_args. */ +#define SEND_PACK_PUSH_CERT_NEVER 0 +#define SEND_PACK_PUSH_CERT_IF_ASKED 1 +#define SEND_PACK_PUSH_CERT_ALWAYS 2 + struct send_pack_args { const char *url; unsigned verbose:1, @@ -12,11 +17,16 @@ struct send_pack_args { use_thin_pack:1, use_ofs_delta:1, dry_run:1, - push_cert:1, + /* One of the SEND_PACK_PUSH_CERT_* constants. */ + push_cert:2, stateless_rpc:1, atomic:1; }; +struct option; +int option_parse_push_signed(const struct option *opt, + const char *arg, int unset); + int send_pack(struct send_pack_args *args, int fd[], struct child_process *conn, struct ref *remote_refs, struct sha1_array *extra_have); diff --git a/transport-helper.c b/transport-helper.c index 5d99a6bc2e..fd5723f528 100644 --- a/transport-helper.c +++ b/transport-helper.c @@ -257,7 +257,6 @@ static const char *boolean_options[] = { TRANS_OPT_THIN, TRANS_OPT_KEEP, TRANS_OPT_FOLLOWTAGS, - TRANS_OPT_PUSH_CERT }; static int set_helper_option(struct transport *transport, @@ -763,6 +762,21 @@ static int push_update_refs_status(struct helper_data *data, return ret; } +static void set_common_push_options(struct transport *transport, + const char *name, int flags) +{ + if (flags & TRANSPORT_PUSH_DRY_RUN) { + if (set_helper_option(transport, "dry-run", "true") != 0) + die("helper %s does not support dry-run", name); + } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) { + if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) + die("helper %s does not support --signed", name); + } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) { + if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0) + die("helper %s does not support --signed=if-asked", name); + } +} + static int push_refs_with_push(struct transport *transport, struct ref *remote_refs, int flags) { @@ -830,14 +844,7 @@ static int push_refs_with_push(struct transport *transport, for_each_string_list_item(cas_option, &cas_options) set_helper_option(transport, "cas", cas_option->string); - - if (flags & TRANSPORT_PUSH_DRY_RUN) { - if (set_helper_option(transport, "dry-run", "true") != 0) - die("helper %s does not support dry-run", data->name); - } else if (flags & TRANSPORT_PUSH_CERT) { - if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) - die("helper %s does not support --signed", data->name); - } + set_common_push_options(transport, data->name, flags); strbuf_addch(&buf, '\n'); sendline(data, &buf); @@ -858,14 +865,7 @@ static int push_refs_with_export(struct transport *transport, if (!data->refspecs) die("remote-helper doesn't support push; refspec needed"); - if (flags & TRANSPORT_PUSH_DRY_RUN) { - if (set_helper_option(transport, "dry-run", "true") != 0) - die("helper %s does not support dry-run", data->name); - } else if (flags & TRANSPORT_PUSH_CERT) { - if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) - die("helper %s does not support --signed", data->name); - } - + set_common_push_options(transport, data->name, flags); if (flags & TRANSPORT_PUSH_FORCE) { if (set_helper_option(transport, "force", "true") != 0) warning("helper %s does not support 'force'", data->name); diff --git a/transport.c b/transport.c index 39a1a66287..12837254d5 100644 --- a/transport.c +++ b/transport.c @@ -828,10 +828,16 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re args.progress = transport->progress; args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN); args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN); - args.push_cert = !!(flags & TRANSPORT_PUSH_CERT); args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC); args.url = transport->url; + if (flags & TRANSPORT_PUSH_CERT_ALWAYS) + args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS; + else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) + args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED; + else + args.push_cert = SEND_PACK_PUSH_CERT_NEVER; + ret = send_pack(&args, data->fd, data->conn, remote_refs, &data->extra_have); diff --git a/transport.h b/transport.h index 79190df12e..d682b77b9e 100644 --- a/transport.h +++ b/transport.h @@ -123,8 +123,9 @@ struct transport { #define TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND 256 #define TRANSPORT_PUSH_NO_HOOK 512 #define TRANSPORT_PUSH_FOLLOW_TAGS 1024 -#define TRANSPORT_PUSH_CERT 2048 -#define TRANSPORT_PUSH_ATOMIC 4096 +#define TRANSPORT_PUSH_CERT_ALWAYS 2048 +#define TRANSPORT_PUSH_CERT_IF_ASKED 4096 +#define TRANSPORT_PUSH_ATOMIC 8192 #define TRANSPORT_SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3) #define TRANSPORT_SUMMARY(x) (int)(TRANSPORT_SUMMARY_WIDTH + strlen(x) - gettext_width(x)), (x)