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Commit | Line | Data |
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ec4465ad | 1 | #include "cache.h" |
8e440259 | 2 | #include "tag.h" |
ec4465ad LT |
3 | |
4 | /* | |
446c6fae RJ |
5 | * A signature file has a very simple fixed format: four lines |
6 | * of "object <sha1>" + "type <typename>" + "tag <tagname>" + | |
7 | * "tagger <committer>", followed by a blank line, a free-form tag | |
8 | * message and a signature block that git itself doesn't care about, | |
9 | * but that can be verified with gpg or similar. | |
ec4465ad | 10 | * |
e0aaf781 | 11 | * The first four lines are guaranteed to be at least 83 bytes: |
ec4465ad | 12 | * "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the |
e0aaf781 BC |
13 | * shortest possible type-line, "tag .\n" at 6 bytes is the shortest |
14 | * single-character-tag line, and "tagger . <> 0 +0000\n" at 20 bytes is | |
15 | * the shortest possible tagger-line. | |
ec4465ad LT |
16 | */ |
17 | ||
ec4465ad LT |
18 | /* |
19 | * We refuse to tag something we can't verify. Just because. | |
20 | */ | |
21 | static int verify_object(unsigned char *sha1, const char *expected_type) | |
22 | { | |
23 | int ret = -1; | |
21666f1a | 24 | enum object_type type; |
91d7b8af | 25 | unsigned long size; |
21666f1a | 26 | void *buffer = read_sha1_file(sha1, &type, &size); |
ec4465ad | 27 | |
91d7b8af | 28 | if (buffer) { |
21666f1a NP |
29 | if (type == type_from_string(expected_type)) |
30 | ret = check_sha1_signature(sha1, buffer, size, expected_type); | |
91d7b8af | 31 | free(buffer); |
ec4465ad LT |
32 | } |
33 | return ret; | |
34 | } | |
35 | ||
579d1fbf RJ |
36 | #ifdef NO_C99_FORMAT |
37 | #define PD_FMT "%d" | |
38 | #else | |
39 | #define PD_FMT "%td" | |
40 | #endif | |
41 | ||
ec4465ad LT |
42 | static int verify_tag(char *buffer, unsigned long size) |
43 | { | |
44 | int typelen; | |
45 | char type[20]; | |
46 | unsigned char sha1[20]; | |
e0aaf781 | 47 | const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb; |
ba26ab99 | 48 | size_t len; |
ec4465ad | 49 | |
e0aaf781 | 50 | if (size < 84) |
446c6fae | 51 | return error("wanna fool me ? you obviously got the size wrong !"); |
cfba0459 | 52 | |
ec4465ad LT |
53 | buffer[size] = 0; |
54 | ||
55 | /* Verify object line */ | |
56 | object = buffer; | |
57 | if (memcmp(object, "object ", 7)) | |
446c6fae | 58 | return error("char%d: does not start with \"object \"", 0); |
cfba0459 | 59 | |
ec4465ad | 60 | if (get_sha1_hex(object + 7, sha1)) |
446c6fae | 61 | return error("char%d: could not get SHA1 hash", 7); |
ec4465ad LT |
62 | |
63 | /* Verify type line */ | |
64 | type_line = object + 48; | |
65 | if (memcmp(type_line - 1, "\ntype ", 6)) | |
446c6fae | 66 | return error("char%d: could not find \"\\ntype \"", 47); |
ec4465ad LT |
67 | |
68 | /* Verify tag-line */ | |
69 | tag_line = strchr(type_line, '\n'); | |
70 | if (!tag_line) | |
579d1fbf | 71 | return error("char" PD_FMT ": could not find next \"\\n\"", type_line - buffer); |
ec4465ad LT |
72 | tag_line++; |
73 | if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n') | |
579d1fbf | 74 | return error("char" PD_FMT ": no \"tag \" found", tag_line - buffer); |
ec4465ad LT |
75 | |
76 | /* Get the actual type */ | |
77 | typelen = tag_line - type_line - strlen("type \n"); | |
78 | if (typelen >= sizeof(type)) | |
579d1fbf | 79 | return error("char" PD_FMT ": type too long", type_line+5 - buffer); |
cfba0459 | 80 | |
ec4465ad LT |
81 | memcpy(type, type_line+5, typelen); |
82 | type[typelen] = 0; | |
83 | ||
84 | /* Verify that the object matches */ | |
ec4465ad | 85 | if (verify_object(sha1, type)) |
446c6fae | 86 | return error("char%d: could not verify object %s", 7, sha1_to_hex(sha1)); |
ec4465ad LT |
87 | |
88 | /* Verify the tag-name: we don't allow control characters or spaces in it */ | |
89 | tag_line += 4; | |
90 | for (;;) { | |
91 | unsigned char c = *tag_line++; | |
92 | if (c == '\n') | |
93 | break; | |
94 | if (c > ' ') | |
95 | continue; | |
579d1fbf | 96 | return error("char" PD_FMT ": could not verify tag name", tag_line - buffer); |
ec4465ad LT |
97 | } |
98 | ||
c818566d EB |
99 | /* Verify the tagger line */ |
100 | tagger_line = tag_line; | |
101 | ||
ba26ab99 | 102 | if (memcmp(tagger_line, "tagger ", 7)) |
e0aaf781 BC |
103 | return error("char" PD_FMT ": could not find \"tagger \"", |
104 | tagger_line - buffer); | |
105 | ||
106 | /* | |
107 | * Check for correct form for name and email | |
108 | * i.e. " <" followed by "> " on _this_ line | |
ba26ab99 BC |
109 | * No angle brackets within the name or email address fields. |
110 | * No spaces within the email address field. | |
e0aaf781 BC |
111 | */ |
112 | tagger_line += 7; | |
113 | if (!(lb = strstr(tagger_line, " <")) || !(rb = strstr(lb+2, "> ")) || | |
ba26ab99 BC |
114 | strpbrk(tagger_line, "<>\n") != lb+1 || |
115 | strpbrk(lb+2, "><\n ") != rb) | |
116 | return error("char" PD_FMT ": malformed tagger field", | |
e0aaf781 BC |
117 | tagger_line - buffer); |
118 | ||
119 | /* Check for author name, at least one character, space is acceptable */ | |
120 | if (lb == tagger_line) | |
121 | return error("char" PD_FMT ": missing tagger name", | |
122 | tagger_line - buffer); | |
123 | ||
ba26ab99 | 124 | /* timestamp, 1 or more digits followed by space */ |
e0aaf781 | 125 | tagger_line = rb + 2; |
ba26ab99 BC |
126 | if (!(len = strspn(tagger_line, "0123456789"))) |
127 | return error("char" PD_FMT ": missing tag timestamp", | |
e0aaf781 | 128 | tagger_line - buffer); |
ba26ab99 BC |
129 | tagger_line += len; |
130 | if (*tagger_line != ' ') | |
e0aaf781 BC |
131 | return error("char" PD_FMT ": malformed tag timestamp", |
132 | tagger_line - buffer); | |
ba26ab99 | 133 | tagger_line++; |
446c6fae | 134 | |
e0aaf781 BC |
135 | /* timezone, 5 digits [+-]hhmm, max. 1400 */ |
136 | if (!((tagger_line[0] == '+' || tagger_line[0] == '-') && | |
ba26ab99 | 137 | strspn(tagger_line+1, "0123456789") == 4 && |
e0aaf781 BC |
138 | tagger_line[5] == '\n' && atoi(tagger_line+1) <= 1400)) |
139 | return error("char" PD_FMT ": malformed tag timezone", | |
140 | tagger_line - buffer); | |
141 | tagger_line += 6; | |
142 | ||
143 | /* Verify the blank line separating the header from the body */ | |
144 | if (*tagger_line != '\n') | |
145 | return error("char" PD_FMT ": trailing garbage in tag header", | |
146 | tagger_line - buffer); | |
c818566d | 147 | |
ec4465ad LT |
148 | /* The actual stuff afterwards we don't care about.. */ |
149 | return 0; | |
150 | } | |
151 | ||
579d1fbf RJ |
152 | #undef PD_FMT |
153 | ||
ec4465ad LT |
154 | int main(int argc, char **argv) |
155 | { | |
fd17f5b5 | 156 | struct strbuf buf; |
ec4465ad LT |
157 | unsigned char result_sha1[20]; |
158 | ||
159 | if (argc != 1) | |
15e593e4 | 160 | usage("git-mktag < signaturefile"); |
ec4465ad | 161 | |
53228a5f JH |
162 | setup_git_directory(); |
163 | ||
fd17f5b5 PH |
164 | strbuf_init(&buf, 0); |
165 | if (strbuf_read(&buf, 0, 4096) < 0) { | |
e7332f96 | 166 | die("could not read from stdin"); |
b97e3dfa | 167 | } |
ec4465ad | 168 | |
a9486b02 PR |
169 | /* Verify it for some basic sanity: it needs to start with |
170 | "object <sha1>\ntype\ntagger " */ | |
fd17f5b5 | 171 | if (verify_tag(buf.buf, buf.len) < 0) |
ec4465ad LT |
172 | die("invalid tag signature file"); |
173 | ||
fd17f5b5 | 174 | if (write_sha1_file(buf.buf, buf.len, tag_type, result_sha1) < 0) |
ec4465ad | 175 | die("unable to write tag file"); |
e7332f96 | 176 | |
fd17f5b5 | 177 | strbuf_release(&buf); |
ec4465ad LT |
178 | printf("%s\n", sha1_to_hex(result_sha1)); |
179 | return 0; | |
180 | } |