diff options
Diffstat (limited to 'builtin/mktag.c')
-rw-r--r-- | builtin/mktag.c | 196 |
1 files changed, 50 insertions, 146 deletions
diff --git a/builtin/mktag.c b/builtin/mktag.c index d89a3c201d..4dd35bc79e 100644 --- a/builtin/mktag.c +++ b/builtin/mktag.c @@ -2,160 +2,60 @@ #include "tag.h" #include "replace-object.h" #include "object-store.h" +#include "fsck.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 struct object_id *oid, const char *expected_type) +static int mktag_fsck_error_func(struct fsck_options *o, + const struct object_id *oid, + enum object_type object_type, + int msg_type, const char *message) { - int ret = -1; - enum object_type type; - unsigned long size; - void *buffer = read_object_file(oid, &type, &size); - const struct object_id *repl = lookup_replace_object(the_repository, oid); - - if (buffer) { - if (type == type_from_string(expected_type)) { - ret = check_object_signature(the_repository, repl, - buffer, size, - expected_type); - } - free(buffer); + switch (msg_type) { + case FSCK_WARN: + case FSCK_ERROR: + /* + * We treat both warnings and errors as errors, things + * like missing "tagger" lines are "only" warnings + * under fsck, we've always considered them an error. + */ + fprintf_ln(stderr, "error: tag input does not pass fsck: %s", message); + return 1; + default: + BUG("%d (FSCK_IGNORE?) should never trigger this callback", + msg_type); } - return ret; } -static int verify_tag(char *buffer, unsigned long size) +static int verify_object_in_tag(struct object_id *tagged_oid, int *tagged_type) { - int typelen; - char type[20]; - struct object_id oid; - const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb, *p; - 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 (parse_oid_hex(object + 7, &oid, &p)) - return error("char%d: could not get SHA1 hash", 7); - - /* Verify type line */ - type_line = p + 1; - 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%"PRIuMAX": could not find next \"\\n\"", - (uintmax_t) (type_line - buffer)); - tag_line++; - if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n') - return error("char%"PRIuMAX": no \"tag \" found", - (uintmax_t) (tag_line - buffer)); - - /* Get the actual type */ - typelen = tag_line - type_line - strlen("type \n"); - if (typelen >= sizeof(type)) - return error("char%"PRIuMAX": type too long", - (uintmax_t) (type_line+5 - buffer)); - - memcpy(type, type_line+5, typelen); - type[typelen] = 0; - - /* Verify that the object matches */ - if (verify_object(&oid, type)) - return error("char%d: could not verify object %s", 7, oid_to_hex(&oid)); - - /* 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%"PRIuMAX": could not verify tag name", - (uintmax_t) (tag_line - buffer)); - } - - /* Verify the tagger line */ - tagger_line = tag_line; - - if (memcmp(tagger_line, "tagger ", 7)) - return error("char%"PRIuMAX": could not find \"tagger \"", - (uintmax_t) (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%"PRIuMAX": malformed tagger field", - (uintmax_t) (tagger_line - buffer)); - - /* Check for author name, at least one character, space is acceptable */ - if (lb == tagger_line) - return error("char%"PRIuMAX": missing tagger name", - (uintmax_t) (tagger_line - buffer)); - - /* timestamp, 1 or more digits followed by space */ - tagger_line = rb + 2; - if (!(len = strspn(tagger_line, "0123456789"))) - return error("char%"PRIuMAX": missing tag timestamp", - (uintmax_t) (tagger_line - buffer)); - tagger_line += len; - if (*tagger_line != ' ') - return error("char%"PRIuMAX": malformed tag timestamp", - (uintmax_t) (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%"PRIuMAX": malformed tag timezone", - (uintmax_t) (tagger_line - buffer)); - tagger_line += 6; - - /* Verify the blank line separating the header from the body */ - if (*tagger_line != '\n') - return error("char%"PRIuMAX": trailing garbage in tag header", - (uintmax_t) (tagger_line - buffer)); + int ret; + enum object_type type; + unsigned long size; + void *buffer; + const struct object_id *repl; + + buffer = read_object_file(tagged_oid, &type, &size); + if (!buffer) + die("could not read tagged object '%s'", + oid_to_hex(tagged_oid)); + if (type != *tagged_type) + die("object '%s' tagged as '%s', but is a '%s' type", + oid_to_hex(tagged_oid), + type_name(*tagged_type), type_name(type)); + + repl = lookup_replace_object(the_repository, tagged_oid); + ret = check_object_signature(the_repository, repl, + buffer, size, type_name(*tagged_type)); + free(buffer); - /* The actual stuff afterwards we don't care about.. */ - return 0; + return ret; } int cmd_mktag(int argc, const char **argv, const char *prefix) { struct strbuf buf = STRBUF_INIT; + struct fsck_options fsck_options = FSCK_OPTIONS_STRICT; + struct object_id tagged_oid; + int tagged_type; struct object_id result; if (argc != 1) @@ -164,10 +64,14 @@ int cmd_mktag(int argc, const char **argv, const char *prefix) if (strbuf_read(&buf, 0, 0) < 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"); + fsck_options.error_func = mktag_fsck_error_func; + fsck_set_msg_type(&fsck_options, "extraheaderentry", "warn"); + if (fsck_tag_standalone(NULL, buf.buf, buf.len, &fsck_options, + &tagged_oid, &tagged_type)) + die("tag on stdin did not pass our strict fsck check"); + + if (verify_object_in_tag(&tagged_oid, &tagged_type)) + die("tag on stdin did not refer to a valid object"); if (write_object_file(buf.buf, buf.len, tag_type, &result) < 0) die("unable to write tag file"); |