1 #include "cache.h"
2 #include "tag.h"
3 #include "object-store.h"
4 #include "commit.h"
5 #include "tree.h"
6 #include "blob.h"
7 #include "alloc.h"
8 #include "gpg-interface.h"
9 #include "packfile.h"
10
11 const char *tag_type = "tag";
12
run_gpg_verify(const char * buf,unsigned long size,unsigned flags)13 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
14 {
15 struct signature_check sigc;
16 struct strbuf payload = STRBUF_INIT;
17 struct strbuf signature = STRBUF_INIT;
18 int ret;
19
20 memset(&sigc, 0, sizeof(sigc));
21
22 if (!parse_signature(buf, size, &payload, &signature)) {
23 if (flags & GPG_VERIFY_VERBOSE)
24 write_in_full(1, buf, size);
25 return error("no signature found");
26 }
27
28 ret = check_signature(payload.buf, payload.len, signature.buf,
29 signature.len, &sigc);
30
31 if (!(flags & GPG_VERIFY_OMIT_STATUS))
32 print_signature_buffer(&sigc, flags);
33
34 signature_check_clear(&sigc);
35 strbuf_release(&payload);
36 strbuf_release(&signature);
37 return ret;
38 }
39
gpg_verify_tag(const struct object_id * oid,const char * name_to_report,unsigned flags)40 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
41 unsigned flags)
42 {
43 enum object_type type;
44 char *buf;
45 unsigned long size;
46 int ret;
47
48 type = oid_object_info(the_repository, oid, NULL);
49 if (type != OBJ_TAG)
50 return error("%s: cannot verify a non-tag object of type %s.",
51 name_to_report ?
52 name_to_report :
53 find_unique_abbrev(oid, DEFAULT_ABBREV),
54 type_name(type));
55
56 buf = read_object_file(oid, &type, &size);
57 if (!buf)
58 return error("%s: unable to read file.",
59 name_to_report ?
60 name_to_report :
61 find_unique_abbrev(oid, DEFAULT_ABBREV));
62
63 ret = run_gpg_verify(buf, size, flags);
64
65 free(buf);
66 return ret;
67 }
68
deref_tag(struct repository * r,struct object * o,const char * warn,int warnlen)69 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
70 {
71 struct object_id *last_oid = NULL;
72 while (o && o->type == OBJ_TAG)
73 if (((struct tag *)o)->tagged) {
74 last_oid = &((struct tag *)o)->tagged->oid;
75 o = parse_object(r, last_oid);
76 } else {
77 last_oid = NULL;
78 o = NULL;
79 }
80 if (!o && warn) {
81 if (last_oid && is_promisor_object(last_oid))
82 return NULL;
83 if (!warnlen)
84 warnlen = strlen(warn);
85 error("missing object referenced by '%.*s'", warnlen, warn);
86 }
87 return o;
88 }
89
deref_tag_noverify(struct object * o)90 struct object *deref_tag_noverify(struct object *o)
91 {
92 while (o && o->type == OBJ_TAG) {
93 o = parse_object(the_repository, &o->oid);
94 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
95 o = ((struct tag *)o)->tagged;
96 else
97 o = NULL;
98 }
99 return o;
100 }
101
lookup_tag(struct repository * r,const struct object_id * oid)102 struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
103 {
104 struct object *obj = lookup_object(r, oid);
105 if (!obj)
106 return create_object(r, oid, alloc_tag_node(r));
107 return object_as_type(obj, OBJ_TAG, 0);
108 }
109
parse_tag_date(const char * buf,const char * tail)110 static timestamp_t parse_tag_date(const char *buf, const char *tail)
111 {
112 const char *dateptr;
113
114 while (buf < tail && *buf++ != '>')
115 /* nada */;
116 if (buf >= tail)
117 return 0;
118 dateptr = buf;
119 while (buf < tail && *buf++ != '\n')
120 /* nada */;
121 if (buf >= tail)
122 return 0;
123 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
124 return parse_timestamp(dateptr, NULL, 10);
125 }
126
release_tag_memory(struct tag * t)127 void release_tag_memory(struct tag *t)
128 {
129 free(t->tag);
130 t->tagged = NULL;
131 t->object.parsed = 0;
132 t->date = 0;
133 }
134
parse_tag_buffer(struct repository * r,struct tag * item,const void * data,unsigned long size)135 int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
136 {
137 struct object_id oid;
138 char type[20];
139 const char *bufptr = data;
140 const char *tail = bufptr + size;
141 const char *nl;
142
143 if (item->object.parsed)
144 return 0;
145
146 if (item->tag) {
147 /*
148 * Presumably left over from a previous failed parse;
149 * clear it out in preparation for re-parsing (we'll probably
150 * hit the same error, which lets us tell our current caller
151 * about the problem).
152 */
153 FREE_AND_NULL(item->tag);
154 }
155
156 if (size < the_hash_algo->hexsz + 24)
157 return -1;
158 if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
159 return -1;
160
161 if (!starts_with(bufptr, "type "))
162 return -1;
163 bufptr += 5;
164 nl = memchr(bufptr, '\n', tail - bufptr);
165 if (!nl || sizeof(type) <= (nl - bufptr))
166 return -1;
167 memcpy(type, bufptr, nl - bufptr);
168 type[nl - bufptr] = '\0';
169 bufptr = nl + 1;
170
171 if (!strcmp(type, blob_type)) {
172 item->tagged = (struct object *)lookup_blob(r, &oid);
173 } else if (!strcmp(type, tree_type)) {
174 item->tagged = (struct object *)lookup_tree(r, &oid);
175 } else if (!strcmp(type, commit_type)) {
176 item->tagged = (struct object *)lookup_commit(r, &oid);
177 } else if (!strcmp(type, tag_type)) {
178 item->tagged = (struct object *)lookup_tag(r, &oid);
179 } else {
180 return error("unknown tag type '%s' in %s",
181 type, oid_to_hex(&item->object.oid));
182 }
183
184 if (!item->tagged)
185 return error("bad tag pointer to %s in %s",
186 oid_to_hex(&oid),
187 oid_to_hex(&item->object.oid));
188
189 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
190 ; /* good */
191 else
192 return -1;
193 bufptr += 4;
194 nl = memchr(bufptr, '\n', tail - bufptr);
195 if (!nl)
196 return -1;
197 item->tag = xmemdupz(bufptr, nl - bufptr);
198 bufptr = nl + 1;
199
200 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
201 item->date = parse_tag_date(bufptr, tail);
202 else
203 item->date = 0;
204
205 item->object.parsed = 1;
206 return 0;
207 }
208
parse_tag(struct tag * item)209 int parse_tag(struct tag *item)
210 {
211 enum object_type type;
212 void *data;
213 unsigned long size;
214 int ret;
215
216 if (item->object.parsed)
217 return 0;
218 data = read_object_file(&item->object.oid, &type, &size);
219 if (!data)
220 return error("Could not read %s",
221 oid_to_hex(&item->object.oid));
222 if (type != OBJ_TAG) {
223 free(data);
224 return error("Object %s not a tag",
225 oid_to_hex(&item->object.oid));
226 }
227 ret = parse_tag_buffer(the_repository, item, data, size);
228 free(data);
229 return ret;
230 }
231
get_tagged_oid(struct tag * tag)232 struct object_id *get_tagged_oid(struct tag *tag)
233 {
234 if (!tag->tagged)
235 die("bad tag");
236 return &tag->tagged->oid;
237 }
238