Revision 3ec804490a265f4c418a321428c12f3f18b7eff5 authored by Jeff King on 29 April 2017, 12:36:44 UTC, committed by Junio C Hamano on 05 May 2017, 03:07:27 UTC
When a remote server uses git-shell, the client side will connect to it like: ssh server "git-upload-pack 'foo.git'" and we literally exec ("git-upload-pack", "foo.git"). In early versions of upload-pack and receive-pack, we took a repository argument and nothing else. But over time they learned to accept dashed options. If the user passes a repository name that starts with a dash, the results are confusing at best (we complain of a bogus option instead of a non-existent repository) and malicious at worst (the user can start an interactive pager via "--help"). We could pass "--" to the sub-process to make sure the user's argument is interpreted as a branch name. I.e.: git-upload-pack -- -foo.git But adding "--" automatically would make us inconsistent with a normal shell (i.e., when git-shell is not in use), where "-foo.git" would still be an error. For that case, the client would have to specify the "--", but they can't do so reliably, as existing versions of git-shell do not allow more than a single argument. The simplest thing is to simply disallow "-" at the start of the repo name argument. This hasn't worked either with or without git-shell since version 1.0.0, and nobody has complained. Note that this patch just applies to do_generic_cmd(), which runs upload-pack, receive-pack, and upload-archive. There are two other types of commands that git-shell runs: - do_cvs_cmd(), but this already restricts the argument to be the literal string "server" - admin-provided commands in the git-shell-commands directory. We'll pass along arbitrary arguments there, so these commands could have similar problems. But these commands might actually understand dashed arguments, so we cannot just block them here. It's up to the writer of the commands to make sure they are safe. With great power comes great responsibility. Reported-by: Timo Schmid <tschmid@ernw.de> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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column.h
#ifndef COLUMN_H
#define COLUMN_H
#define COL_LAYOUT_MASK 0x000F
#define COL_ENABLE_MASK 0x0030 /* always, never or auto */
#define COL_PARSEOPT 0x0040 /* --column is given from cmdline */
#define COL_DENSE 0x0080 /* Shrink columns when possible,
making space for more columns */
#define COL_DISABLED 0x0000 /* must be zero */
#define COL_ENABLED 0x0010
#define COL_AUTO 0x0020
#define COL_LAYOUT(c) ((c) & COL_LAYOUT_MASK)
#define COL_COLUMN 0 /* Fill columns before rows */
#define COL_ROW 1 /* Fill rows before columns */
#define COL_PLAIN 15 /* one column */
#define explicitly_enable_column(c) \
(((c) & COL_PARSEOPT) && column_active(c))
struct column_options {
int width;
int padding;
const char *indent;
const char *nl;
};
struct option;
extern int parseopt_column_callback(const struct option *, const char *, int);
extern int git_column_config(const char *var, const char *value,
const char *command, unsigned int *colopts);
extern int finalize_colopts(unsigned int *colopts, int stdout_is_tty);
static inline int column_active(unsigned int colopts)
{
return (colopts & COL_ENABLE_MASK) == COL_ENABLED;
}
extern void print_columns(const struct string_list *list, unsigned int colopts,
const struct column_options *opts);
extern int run_column_filter(int colopts, const struct column_options *);
extern int stop_column_filter(void);
#endif
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