diff options
Diffstat (limited to 'mktag.c')
-rw-r--r-- | mktag.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/mktag.c b/mktag.c deleted file mode 100644 index a3b4270..0000000 --- a/mktag.c +++ /dev/null @@ -1,183 +0,0 @@ -#include "cache.h" -#include "tag.h" -#include "exec_cmd.h" - -/* - * A signature file has a very simple fixed format: four lines - * of "object <sha1>" + "type <typename>" + "tag <tagname>" + - * "tagger <committer>", followed by a blank line, a free-form tag - * message and a signature block that git itself doesn't care about, - * but that can be verified with gpg or similar. - * - * The first four lines are guaranteed to be at least 83 bytes: - * "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the - * shortest possible type-line, "tag .\n" at 6 bytes is the shortest - * single-character-tag line, and "tagger . <> 0 +0000\n" at 20 bytes is - * the shortest possible tagger-line. - */ - -/* - * We refuse to tag something we can't verify. Just because. - */ -static int verify_object(const unsigned char *sha1, const char *expected_type) -{ - int ret = -1; - enum object_type type; - unsigned long size; - const unsigned char *repl; - void *buffer = read_sha1_file_repl(sha1, &type, &size, &repl); - - if (buffer) { - if (type == type_from_string(expected_type)) - ret = check_sha1_signature(repl, buffer, size, expected_type); - free(buffer); - } - return ret; -} - -#ifdef NO_C99_FORMAT -#define PD_FMT "%d" -#else -#define PD_FMT "%td" -#endif - -static int verify_tag(char *buffer, unsigned long size) -{ - int typelen; - char type[20]; - unsigned char sha1[20]; - const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb; - size_t len; - - if (size < 84) - return error("wanna fool me ? you obviously got the size wrong !"); - - buffer[size] = 0; - - /* Verify object line */ - object = buffer; - if (memcmp(object, "object ", 7)) - return error("char%d: does not start with \"object \"", 0); - - if (get_sha1_hex(object + 7, sha1)) - return error("char%d: could not get SHA1 hash", 7); - - /* Verify type line */ - type_line = object + 48; - if (memcmp(type_line - 1, "\ntype ", 6)) - return error("char%d: could not find \"\\ntype \"", 47); - - /* Verify tag-line */ - tag_line = strchr(type_line, '\n'); - if (!tag_line) - return error("char" PD_FMT ": could not find next \"\\n\"", type_line - buffer); - tag_line++; - if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n') - return error("char" PD_FMT ": no \"tag \" found", tag_line - buffer); - - /* Get the actual type */ - typelen = tag_line - type_line - strlen("type \n"); - if (typelen >= sizeof(type)) - return error("char" PD_FMT ": type too long", type_line+5 - buffer); - - memcpy(type, type_line+5, typelen); - type[typelen] = 0; - - /* Verify that the object matches */ - if (verify_object(sha1, type)) - return error("char%d: could not verify object %s", 7, sha1_to_hex(sha1)); - - /* Verify the tag-name: we don't allow control characters or spaces in it */ - tag_line += 4; - for (;;) { - unsigned char c = *tag_line++; - if (c == '\n') - break; - if (c > ' ') - continue; - return error("char" PD_FMT ": could not verify tag name", tag_line - buffer); - } - - /* Verify the tagger line */ - tagger_line = tag_line; - - if (memcmp(tagger_line, "tagger ", 7)) - return error("char" PD_FMT ": could not find \"tagger \"", - tagger_line - buffer); - - /* - * Check for correct form for name and email - * i.e. " <" followed by "> " on _this_ line - * No angle brackets within the name or email address fields. - * No spaces within the email address field. - */ - tagger_line += 7; - if (!(lb = strstr(tagger_line, " <")) || !(rb = strstr(lb+2, "> ")) || - strpbrk(tagger_line, "<>\n") != lb+1 || - strpbrk(lb+2, "><\n ") != rb) - return error("char" PD_FMT ": malformed tagger field", - tagger_line - buffer); - - /* Check for author name, at least one character, space is acceptable */ - if (lb == tagger_line) - return error("char" PD_FMT ": missing tagger name", - tagger_line - buffer); - - /* timestamp, 1 or more digits followed by space */ - tagger_line = rb + 2; - if (!(len = strspn(tagger_line, "0123456789"))) - return error("char" PD_FMT ": missing tag timestamp", - tagger_line - buffer); - tagger_line += len; - if (*tagger_line != ' ') - return error("char" PD_FMT ": malformed tag timestamp", - tagger_line - buffer); - tagger_line++; - - /* timezone, 5 digits [+-]hhmm, max. 1400 */ - if (!((tagger_line[0] == '+' || tagger_line[0] == '-') && - strspn(tagger_line+1, "0123456789") == 4 && - tagger_line[5] == '\n' && atoi(tagger_line+1) <= 1400)) - return error("char" PD_FMT ": malformed tag timezone", - tagger_line - buffer); - tagger_line += 6; - - /* Verify the blank line separating the header from the body */ - if (*tagger_line != '\n') - return error("char" PD_FMT ": trailing garbage in tag header", - tagger_line - buffer); - - /* The actual stuff afterwards we don't care about.. */ - return 0; -} - -#undef PD_FMT - -int main(int argc, char **argv) -{ - struct strbuf buf = STRBUF_INIT; - unsigned char result_sha1[20]; - - if (argc != 1) - usage("git mktag < signaturefile"); - - git_extract_argv0_path(argv[0]); - - setup_git_directory(); - - if (strbuf_read(&buf, 0, 4096) < 0) { - die_errno("could not read from stdin"); - } - - /* Verify it for some basic sanity: it needs to start with - "object <sha1>\ntype\ntagger " */ - if (verify_tag(buf.buf, buf.len) < 0) - die("invalid tag signature file"); - - if (write_sha1_file(buf.buf, buf.len, tag_type, result_sha1) < 0) - die("unable to write tag file"); - - strbuf_release(&buf); - printf("%s\n", sha1_to_hex(result_sha1)); - return 0; -} |