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authorJunio C Hamano <gitster@pobox.com>2014-10-08 20:05:15 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-10-08 20:05:25 (GMT)
commitfb06b5280ea05d75515fa780cf08d4ec9d6fe101 (patch)
tree9d7c7032df370076149f31f3373e067b69248169 /send-pack.c
parent325602ce120e7bd7321b9ed409b49b48fd20888e (diff)
parent6f5ef44e0d8933621fcd50127518557013002313 (diff)
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Merge branch 'jc/push-cert'
Allow "git push" request to be signed, so that it can be verified and audited, using the GPG signature of the person who pushed, that the tips of branches at a public repository really point the commits the pusher wanted to, without having to "trust" the server. * jc/push-cert: (24 commits) receive-pack::hmac_sha1(): copy the entire SHA-1 hash out signed push: allow stale nonce in stateless mode signed push: teach smart-HTTP to pass "git push --signed" around signed push: fortify against replay attacks signed push: add "pushee" header to push certificate signed push: remove duplicated protocol info send-pack: send feature request on push-cert packet receive-pack: GPG-validate push certificates push: the beginning of "git push --signed" pack-protocol doc: typofix for PKT-LINE gpg-interface: move parse_signature() to where it should be gpg-interface: move parse_gpg_output() to where it should be send-pack: clarify that cmds_sent is a boolean send-pack: refactor inspecting and resetting status and sending commands send-pack: rename "new_refs" to "need_pack_data" receive-pack: factor out capability string generation send-pack: factor out capability string generation send-pack: always send capabilities send-pack: refactor decision to send update per ref send-pack: move REF_STATUS_REJECT_NODELETE logic a bit higher ...
Diffstat (limited to 'send-pack.c')
-rw-r--r--send-pack.c201
1 files changed, 154 insertions, 47 deletions
diff --git a/send-pack.c b/send-pack.c
index 8b4cbf0..949cb61 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -11,6 +11,7 @@
#include "transport.h"
#include "version.h"
#include "sha1-array.h"
+#include "gpg-interface.h"
static int feed_object(const unsigned char *sha1, int fd, int negative)
{
@@ -189,6 +190,94 @@ static void advertise_shallow_grafts_buf(struct strbuf *sb)
for_each_commit_graft(advertise_shallow_grafts_cb, sb);
}
+static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
+{
+ if (!ref->peer_ref && !args->send_mirror)
+ return 0;
+
+ /* Check for statuses set by set_ref_status_for_push() */
+ switch (ref->status) {
+ case REF_STATUS_REJECT_NONFASTFORWARD:
+ case REF_STATUS_REJECT_ALREADY_EXISTS:
+ case REF_STATUS_REJECT_FETCH_FIRST:
+ case REF_STATUS_REJECT_NEEDS_FORCE:
+ case REF_STATUS_REJECT_STALE:
+ case REF_STATUS_REJECT_NODELETE:
+ case REF_STATUS_UPTODATE:
+ return 0;
+ default:
+ return 1;
+ }
+}
+
+/*
+ * the beginning of the next line, or the end of buffer.
+ *
+ * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
+ * convert many similar uses found by "git grep -A4 memchr".
+ */
+static const char *next_line(const char *line, size_t len)
+{
+ const char *nl = memchr(line, '\n', len);
+ if (!nl)
+ return line + len; /* incomplete line */
+ return nl + 1;
+}
+
+static int generate_push_cert(struct strbuf *req_buf,
+ const struct ref *remote_refs,
+ struct send_pack_args *args,
+ const char *cap_string,
+ const char *push_cert_nonce)
+{
+ const struct ref *ref;
+ char *signing_key = xstrdup(get_signing_key());
+ const char *cp, *np;
+ struct strbuf cert = STRBUF_INIT;
+ int update_seen = 0;
+
+ strbuf_addf(&cert, "certificate version 0.1\n");
+ strbuf_addf(&cert, "pusher %s ", signing_key);
+ datestamp(&cert);
+ strbuf_addch(&cert, '\n');
+ if (args->url && *args->url) {
+ char *anon_url = transport_anonymize_url(args->url);
+ strbuf_addf(&cert, "pushee %s\n", anon_url);
+ free(anon_url);
+ }
+ if (push_cert_nonce[0])
+ strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
+ strbuf_addstr(&cert, "\n");
+
+ for (ref = remote_refs; ref; ref = ref->next) {
+ if (!ref_update_to_be_sent(ref, args))
+ continue;
+ update_seen = 1;
+ strbuf_addf(&cert, "%s %s %s\n",
+ sha1_to_hex(ref->old_sha1),
+ sha1_to_hex(ref->new_sha1),
+ ref->name);
+ }
+ if (!update_seen)
+ goto free_return;
+
+ if (sign_buffer(&cert, &cert, signing_key))
+ die(_("failed to sign the push certificate"));
+
+ packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
+ for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
+ np = next_line(cp, cert.buf + cert.len - cp);
+ packet_buf_write(req_buf,
+ "%.*s", (int)(np - cp), cp);
+ }
+ packet_buf_write(req_buf, "push-cert-end\n");
+
+free_return:
+ free(signing_key);
+ strbuf_release(&cert);
+ return update_seen;
+}
+
int send_pack(struct send_pack_args *args,
int fd[], struct child_process *conn,
struct ref *remote_refs,
@@ -197,8 +286,9 @@ int send_pack(struct send_pack_args *args,
int in = fd[0];
int out = fd[1];
struct strbuf req_buf = STRBUF_INIT;
+ struct strbuf cap_buf = STRBUF_INIT;
struct ref *ref;
- int new_refs;
+ int need_pack_data = 0;
int allow_deleting_refs = 0;
int status_report = 0;
int use_sideband = 0;
@@ -207,6 +297,7 @@ int send_pack(struct send_pack_args *args,
unsigned cmds_sent = 0;
int ret;
struct async demux;
+ const char *push_cert_nonce = NULL;
/* Does the other end support the reporting? */
if (server_supports("report-status"))
@@ -223,6 +314,14 @@ int send_pack(struct send_pack_args *args,
agent_supported = 1;
if (server_supports("no-thin"))
args->use_thin_pack = 0;
+ if (args->push_cert) {
+ int len;
+
+ push_cert_nonce = server_feature_value("push-cert", &len);
+ if (!push_cert_nonce)
+ die(_("the receiving end does not support --signed push"));
+ push_cert_nonce = xmemdupz(push_cert_nonce, len);
+ }
if (!remote_refs) {
fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
@@ -230,64 +329,71 @@ int send_pack(struct send_pack_args *args,
return 0;
}
+ if (status_report)
+ strbuf_addstr(&cap_buf, " report-status");
+ if (use_sideband)
+ strbuf_addstr(&cap_buf, " side-band-64k");
+ if (quiet_supported && (args->quiet || !args->progress))
+ strbuf_addstr(&cap_buf, " quiet");
+ if (agent_supported)
+ strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
+
+ /*
+ * NEEDSWORK: why does delete-refs have to be so specific to
+ * send-pack machinery that set_ref_status_for_push() cannot
+ * set this bit for us???
+ */
+ for (ref = remote_refs; ref; ref = ref->next)
+ if (ref->deletion && !allow_deleting_refs)
+ ref->status = REF_STATUS_REJECT_NODELETE;
+
if (!args->dry_run)
advertise_shallow_grafts_buf(&req_buf);
+ if (!args->dry_run && args->push_cert)
+ cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
+ cap_buf.buf, push_cert_nonce);
+
/*
- * Finally, tell the other end!
+ * Clear the status for each ref and see if we need to send
+ * the pack data.
*/
- new_refs = 0;
for (ref = remote_refs; ref; ref = ref->next) {
- if (!ref->peer_ref && !args->send_mirror)
+ if (!ref_update_to_be_sent(ref, args))
continue;
- /* Check for statuses set by set_ref_status_for_push() */
- switch (ref->status) {
- case REF_STATUS_REJECT_NONFASTFORWARD:
- case REF_STATUS_REJECT_ALREADY_EXISTS:
- case REF_STATUS_REJECT_FETCH_FIRST:
- case REF_STATUS_REJECT_NEEDS_FORCE:
- case REF_STATUS_REJECT_STALE:
- case REF_STATUS_UPTODATE:
- continue;
- default:
- ; /* do nothing */
- }
+ if (!ref->deletion)
+ need_pack_data = 1;
- if (ref->deletion && !allow_deleting_refs) {
- ref->status = REF_STATUS_REJECT_NODELETE;
+ if (args->dry_run || !status_report)
+ ref->status = REF_STATUS_OK;
+ else
+ ref->status = REF_STATUS_EXPECTING_REPORT;
+ }
+
+ /*
+ * Finally, tell the other end!
+ */
+ for (ref = remote_refs; ref; ref = ref->next) {
+ char *old_hex, *new_hex;
+
+ if (args->dry_run || args->push_cert)
continue;
- }
- if (!ref->deletion)
- new_refs++;
+ if (!ref_update_to_be_sent(ref, args))
+ continue;
- if (args->dry_run) {
- ref->status = REF_STATUS_OK;
+ old_hex = sha1_to_hex(ref->old_sha1);
+ new_hex = sha1_to_hex(ref->new_sha1);
+ if (!cmds_sent) {
+ packet_buf_write(&req_buf,
+ "%s %s %s%c%s",
+ old_hex, new_hex, ref->name, 0,
+ cap_buf.buf);
+ cmds_sent = 1;
} else {
- char *old_hex = sha1_to_hex(ref->old_sha1);
- char *new_hex = sha1_to_hex(ref->new_sha1);
- int quiet = quiet_supported && (args->quiet || !args->progress);
-
- if (!cmds_sent && (status_report || use_sideband ||
- quiet || agent_supported)) {
- packet_buf_write(&req_buf,
- "%s %s %s%c%s%s%s%s%s",
- old_hex, new_hex, ref->name, 0,
- status_report ? " report-status" : "",
- use_sideband ? " side-band-64k" : "",
- quiet ? " quiet" : "",
- agent_supported ? " agent=" : "",
- agent_supported ? git_user_agent_sanitized() : ""
- );
- }
- else
- packet_buf_write(&req_buf, "%s %s %s",
- old_hex, new_hex, ref->name);
- ref->status = status_report ?
- REF_STATUS_EXPECTING_REPORT :
- REF_STATUS_OK;
- cmds_sent++;
+ packet_buf_write(&req_buf, "%s %s %s",
+ old_hex, new_hex, ref->name);
}
}
@@ -301,6 +407,7 @@ int send_pack(struct send_pack_args *args,
packet_flush(out);
}
strbuf_release(&req_buf);
+ strbuf_release(&cap_buf);
if (use_sideband && cmds_sent) {
memset(&demux, 0, sizeof(demux));
@@ -312,7 +419,7 @@ int send_pack(struct send_pack_args *args,
in = demux.out;
}
- if (new_refs && cmds_sent) {
+ if (need_pack_data && cmds_sent) {
if (pack_objects(out, remote_refs, extra_have, args) < 0) {
for (ref = remote_refs; ref; ref = ref->next)
ref->status = REF_STATUS_NONE;