From 88e9b1e3fcbd3a8edcf1d54528c49f8237906aba Mon Sep 17 00:00:00 2001 From: Ivan Frade Date: Wed, 10 Nov 2021 23:51:28 +0000 Subject: fetch-pack: redact packfile urls in traces In some setups, packfile uris act as bearer token. It is not recommended to expose them plainly in logs, although in special circunstances (e.g. debug) it makes sense to write them. Redact the packfile URL paths by default, unless the GIT_TRACE_REDACT variable is set to false. This mimics the redacting of the Authorization header in HTTP. Signed-off-by: Ivan Frade Signed-off-by: Junio C Hamano --- pkt-line.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) (limited to 'pkt-line.c') diff --git a/pkt-line.c b/pkt-line.c index 2dc8ac274b..8e43c2def4 100644 --- a/pkt-line.c +++ b/pkt-line.c @@ -370,6 +370,32 @@ int packet_length(const char lenbuf_hex[4]) return (val < 0) ? val : (val << 8) | hex2chr(lenbuf_hex + 2); } +static char *find_packfile_uri_path(const char *buffer) +{ + const char *URI_MARK = "://"; + char *path; + int len; + + /* First char is sideband mark */ + buffer += 1; + + len = strspn(buffer, "0123456789abcdefABCDEF"); + /* size of SHA1 and SHA256 hash */ + if (!(len == 40 || len == 64) || buffer[len] != ' ') + return NULL; /* required "SP" not seen */ + + path = strstr(buffer + len + 1, URI_MARK); + if (!path) + return NULL; + + path = strchr(path + strlen(URI_MARK), '/'); + if (!path || !*(path + 1)) + return NULL; + + /* position after '/' */ + return ++path; +} + enum packet_read_status packet_read_with_status(int fd, char **src_buffer, size_t *src_len, char *buffer, unsigned size, int *pktlen, @@ -377,6 +403,7 @@ enum packet_read_status packet_read_with_status(int fd, char **src_buffer, { int len; char linelen[4]; + char *uri_path_start; if (get_packet_data(fd, src_buffer, src_len, linelen, 4, options) < 0) { *pktlen = -1; @@ -427,7 +454,18 @@ enum packet_read_status packet_read_with_status(int fd, char **src_buffer, len--; buffer[len] = 0; - packet_trace(buffer, len, 0); + if (options & PACKET_READ_REDACT_URI_PATH && + (uri_path_start = find_packfile_uri_path(buffer))) { + const char *redacted = ""; + struct strbuf tracebuf = STRBUF_INIT; + strbuf_insert(&tracebuf, 0, buffer, len); + strbuf_splice(&tracebuf, uri_path_start - buffer, + strlen(uri_path_start), redacted, strlen(redacted)); + packet_trace(tracebuf.buf, tracebuf.len, 0); + strbuf_release(&tracebuf); + } else { + packet_trace(buffer, len, 0); + } if ((options & PACKET_READ_DIE_ON_ERR_PACKET) && starts_with(buffer, "ERR ")) -- cgit v1.2.3