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1 : //==- CheckSecuritySyntaxOnly.cpp - Basic security checks --------*- C++ -*-==//
2 : //
3 : // The LLVM Compiler Infrastructure
4 : //
5 : // This file is distributed under the University of Illinois Open Source
6 : // License. See LICENSE.TXT for details.
7 : //
8 : //===----------------------------------------------------------------------===//
9 : //
10 : // This file defines a set of flow-insensitive security checks.
11 : //
12 : //===----------------------------------------------------------------------===//
13 :
14 : #include "clang/Basic/TargetInfo.h"
15 : #include "clang/Checker/BugReporter/BugReporter.h"
16 : #include "clang/Checker/Checkers/LocalCheckers.h"
17 : #include "clang/AST/StmtVisitor.h"
18 : #include "llvm/Support/raw_ostream.h"
19 :
20 : using namespace clang;
21 :
22 7: static bool isArc4RandomAvailable(const ASTContext &Ctx) {
23 7: const llvm::Triple &T = Ctx.Target.getTriple();
24 : return T.getVendor() == llvm::Triple::Apple ||
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25 7: T.getOS() == llvm::Triple::FreeBSD;
26 : }
27 :
28 : namespace {
29 : class WalkAST : public StmtVisitor<WalkAST> {
30 : BugReporter &BR;
31 : IdentifierInfo *II_gets;
32 : IdentifierInfo *II_getpw;
33 : IdentifierInfo *II_mktemp;
34 : enum { num_rands = 9 };
35 : IdentifierInfo *II_rand[num_rands];
36 : IdentifierInfo *II_random;
37 : enum { num_setids = 6 };
38 : IdentifierInfo *II_setid[num_setids];
39 :
40 : const bool CheckRand;
41 :
42 : public:
43 7: WalkAST(BugReporter &br) : BR(br),
44 : II_gets(0), II_getpw(0), II_mktemp(0),
45 : II_rand(), II_random(0), II_setid(),
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46 7: CheckRand(isArc4RandomAvailable(BR.getContext())) {}
47 :
48 : // Statement visitor methods.
49 : void VisitCallExpr(CallExpr *CE);
50 : void VisitForStmt(ForStmt *S);
51 : void VisitCompoundStmt (CompoundStmt *S);
52 201: void VisitStmt(Stmt *S) { VisitChildren(S); }
53 :
54 : void VisitChildren(Stmt *S);
55 :
56 : // Helpers.
57 : IdentifierInfo *GetIdentifier(IdentifierInfo *& II, const char *str);
58 :
59 : // Checker-specific methods.
60 : void CheckLoopConditionForFloat(const ForStmt *FS);
61 : void CheckCall_gets(const CallExpr *CE, const FunctionDecl *FD);
62 : void CheckCall_getpw(const CallExpr *CE, const FunctionDecl *FD);
63 : void CheckCall_mktemp(const CallExpr *CE, const FunctionDecl *FD);
64 : void CheckCall_rand(const CallExpr *CE, const FunctionDecl *FD);
65 : void CheckCall_random(const CallExpr *CE, const FunctionDecl *FD);
66 : void CheckUncheckedReturnValue(CallExpr *CE);
67 : };
68 : } // end anonymous namespace
69 :
70 : //===----------------------------------------------------------------------===//
71 : // Helper methods.
72 : //===----------------------------------------------------------------------===//
73 :
74 122: IdentifierInfo *WalkAST::GetIdentifier(IdentifierInfo *& II, const char *str) {
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75 122: if (!II)
76 23: II = &BR.getContext().Idents.get(str);
77 :
78 122: return II;
79 : }
80 :
81 : //===----------------------------------------------------------------------===//
82 : // AST walking.
83 : //===----------------------------------------------------------------------===//
84 :
85 242: void WalkAST::VisitChildren(Stmt *S) {
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86 446: for (Stmt::child_iterator I = S->child_begin(), E = S->child_end(); I!=E; ++I)
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87 204: if (Stmt *child = *I)
88 203: Visit(child);
89 242: }
90 :
91 33: void WalkAST::VisitCallExpr(CallExpr *CE) {
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92 33: if (const FunctionDecl *FD = CE->getDirectCallee()) {
93 33: CheckCall_gets(CE, FD);
94 33: CheckCall_getpw(CE, FD);
95 33: CheckCall_mktemp(CE, FD);
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96 33: if (CheckRand) {
97 23: CheckCall_rand(CE, FD);
98 23: CheckCall_random(CE, FD);
99 : }
100 : }
101 :
102 : // Recurse and check children.
103 33: VisitChildren(CE);
104 33: }
105 :
106 15: void WalkAST::VisitCompoundStmt(CompoundStmt *S) {
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107 62: for (Stmt::child_iterator I = S->child_begin(), E = S->child_end(); I!=E; ++I)
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108 47: if (Stmt *child = *I) {
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109 47: if (CallExpr *CE = dyn_cast<CallExpr>(child))
110 27: CheckUncheckedReturnValue(CE);
111 47: Visit(child);
112 : }
113 15: }
114 :
115 8: void WalkAST::VisitForStmt(ForStmt *FS) {
116 8: CheckLoopConditionForFloat(FS);
117 :
118 : // Recurse and check children.
119 8: VisitChildren(FS);
120 8: }
121 :
122 : //===----------------------------------------------------------------------===//
123 : // Check: floating poing variable used as loop counter.
124 : // Originally: <rdar://problem/6336718>
125 : // Implements: CERT security coding advisory FLP-30.
126 : //===----------------------------------------------------------------------===//
127 :
128 : static const DeclRefExpr*
129 17: GetIncrementedVar(const Expr *expr, const VarDecl *x, const VarDecl *y) {
130 17: expr = expr->IgnoreParenCasts();
131 :
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132 17: if (const BinaryOperator *B = dyn_cast<BinaryOperator>(expr)) {
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133 4: if (!(B->isAssignmentOp() || B->isCompoundAssignmentOp() ||
134 : B->getOpcode() == BinaryOperator::Comma))
135 0: return NULL;
136 :
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137 4: if (const DeclRefExpr *lhs = GetIncrementedVar(B->getLHS(), x, y))
138 4: return lhs;
139 :
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140 0: if (const DeclRefExpr *rhs = GetIncrementedVar(B->getRHS(), x, y))
141 0: return rhs;
142 :
143 0: return NULL;
144 : }
145 :
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146 13: if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(expr)) {
147 8: const NamedDecl *ND = DR->getDecl();
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148 8: return ND == x || ND == y ? DR : NULL;
149 : }
150 :
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151 5: if (const UnaryOperator *U = dyn_cast<UnaryOperator>(expr))
152 : return U->isIncrementDecrementOp()
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153 5: ? GetIncrementedVar(U->getSubExpr(), x, y) : NULL;
154 :
155 0: return NULL;
156 : }
157 :
158 : /// CheckLoopConditionForFloat - This check looks for 'for' statements that
159 : /// use a floating point variable as a loop counter.
160 : /// CERT: FLP30-C, FLP30-CPP.
161 : ///
162 8: void WalkAST::CheckLoopConditionForFloat(const ForStmt *FS) {
163 : // Does the loop have a condition?
164 8: const Expr *condition = FS->getCond();
165 :
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166 8: if (!condition)
167 0: return;
168 :
169 : // Does the loop have an increment?
170 8: const Expr *increment = FS->getInc();
171 :
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8: branch 1 taken
172 8: if (!increment)
173 0: return;
174 :
175 : // Strip away '()' and casts.
176 8: condition = condition->IgnoreParenCasts();
177 8: increment = increment->IgnoreParenCasts();
178 :
179 : // Is the loop condition a comparison?
180 8: const BinaryOperator *B = dyn_cast<BinaryOperator>(condition);
181 :
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182 8: if (!B)
183 0: return;
184 :
185 : // Is this a comparison?
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186 8: if (!(B->isRelationalOp() || B->isEqualityOp()))
187 0: return;
188 :
189 : // Are we comparing variables?
190 8: const DeclRefExpr *drLHS = dyn_cast<DeclRefExpr>(B->getLHS()->IgnoreParens());
191 8: const DeclRefExpr *drRHS = dyn_cast<DeclRefExpr>(B->getRHS()->IgnoreParens());
192 :
193 : // Does at least one of the variables have a floating point type?
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194 8: drLHS = drLHS && drLHS->getType()->isFloatingType() ? drLHS : NULL;
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195 8: drRHS = drRHS && drRHS->getType()->isFloatingType() ? drRHS : NULL;
196 :
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197 8: if (!drLHS && !drRHS)
198 0: return;
199 :
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200 8: const VarDecl *vdLHS = drLHS ? dyn_cast<VarDecl>(drLHS->getDecl()) : NULL;
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201 8: const VarDecl *vdRHS = drRHS ? dyn_cast<VarDecl>(drRHS->getDecl()) : NULL;
202 :
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203 8: if (!vdLHS && !vdRHS)
204 0: return;
205 :
206 : // Does either variable appear in increment?
207 8: const DeclRefExpr *drInc = GetIncrementedVar(increment, vdLHS, vdRHS);
208 :
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209 8: if (!drInc)
210 0: return;
211 :
212 : // Emit the error. First figure out which DeclRefExpr in the condition
213 : // referenced the compared variable.
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214 8: const DeclRefExpr *drCond = vdLHS == drInc->getDecl() ? drLHS : drRHS;
215 :
216 8: llvm::SmallVector<SourceRange, 2> ranges;
217 8: std::string sbuf;
218 8: llvm::raw_string_ostream os(sbuf);
219 :
220 : os << "Variable '" << drCond->getDecl()->getNameAsCString()
221 : << "' with floating point type '" << drCond->getType().getAsString()
222 8: << "' should not be used as a loop counter";
223 :
224 8: ranges.push_back(drCond->getSourceRange());
225 8: ranges.push_back(drInc->getSourceRange());
226 :
227 8: const char *bugType = "Floating point variable used as loop counter";
228 : BR.EmitBasicReport(bugType, "Security", os.str(),
229 8: FS->getLocStart(), ranges.data(), ranges.size());
230 : }
231 :
232 : //===----------------------------------------------------------------------===//
233 : // Check: Any use of 'gets' is insecure.
234 : // Originally: <rdar://problem/6335715>
235 : // Implements (part of): 300-BSI (buildsecurityin.us-cert.gov)
236 : // CWE-242: Use of Inherently Dangerous Function
237 : //===----------------------------------------------------------------------===//
238 :
239 33: void WalkAST::CheckCall_gets(const CallExpr *CE, const FunctionDecl *FD) {
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240 33: if (FD->getIdentifier() != GetIdentifier(II_gets, "gets"))
241 32: return;
242 :
243 1: const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
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244 1: if (!FPT)
245 0: return;
246 :
247 : // Verify that the function takes a single argument.
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248 1: if (FPT->getNumArgs() != 1)
249 0: return;
250 :
251 : // Is the argument a 'char*'?
252 1: const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(0));
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253 1: if (!PT)
254 0: return;
255 :
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256 1: if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
257 0: return;
258 :
259 : // Issue a warning.
260 1: SourceRange R = CE->getCallee()->getSourceRange();
261 : BR.EmitBasicReport("Potential buffer overflow in call to 'gets'",
262 : "Security",
263 : "Call to function 'gets' is extremely insecure as it can "
264 : "always result in a buffer overflow",
265 1: CE->getLocStart(), &R, 1);
266 : }
267 :
268 : //===----------------------------------------------------------------------===//
269 : // Check: Any use of 'getpwd' is insecure.
270 : // CWE-477: Use of Obsolete Functions
271 : //===----------------------------------------------------------------------===//
272 :
273 33: void WalkAST::CheckCall_getpw(const CallExpr *CE, const FunctionDecl *FD) {
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274 33: if (FD->getIdentifier() != GetIdentifier(II_getpw, "getpw"))
275 32: return;
276 :
277 1: const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
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278 1: if (!FPT)
279 0: return;
280 :
281 : // Verify that the function takes two arguments.
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282 1: if (FPT->getNumArgs() != 2)
283 0: return;
284 :
285 : // Verify the first argument type is integer.
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286 1: if (!FPT->getArgType(0)->isIntegerType())
287 0: return;
288 :
289 : // Verify the second argument type is char*.
290 1: const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(1));
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291 1: if (!PT)
292 0: return;
293 :
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294 1: if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
295 0: return;
296 :
297 : // Issue a warning.
298 1: SourceRange R = CE->getCallee()->getSourceRange();
299 : BR.EmitBasicReport("Potential buffer overflow in call to 'getpw'",
300 : "Security",
301 : "The getpw() function is dangerous as it may overflow the "
302 : "provided buffer. It is obsoleted by getpwuid().",
303 1: CE->getLocStart(), &R, 1);
304 : }
305 :
306 : //===----------------------------------------------------------------------===//
307 : // Check: Any use of 'mktemp' is insecure.It is obsoleted by mkstemp().
308 : // CWE-377: Insecure Temporary File
309 : //===----------------------------------------------------------------------===//
310 :
311 33: void WalkAST::CheckCall_mktemp(const CallExpr *CE, const FunctionDecl *FD) {
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312 33: if (FD->getIdentifier() != GetIdentifier(II_mktemp, "mktemp"))
313 32: return;
314 :
315 1: const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FD->getType());
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316 1: if(!FPT)
317 0: return;
318 :
319 : // Verify that the funcion takes a single argument.
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320 1: if (FPT->getNumArgs() != 1)
321 0: return;
322 :
323 : // Verify that the argument is Pointer Type.
324 1: const PointerType *PT = dyn_cast<PointerType>(FPT->getArgType(0));
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325 1: if (!PT)
326 0: return;
327 :
328 : // Verify that the argument is a 'char*'.
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329 1: if (PT->getPointeeType().getUnqualifiedType() != BR.getContext().CharTy)
330 0: return;
331 :
332 : // Issue a waring.
333 1: SourceRange R = CE->getCallee()->getSourceRange();
334 : BR.EmitBasicReport("Potential insecure temporary file in call 'mktemp'",
335 : "Security",
336 : "Call to function 'mktemp' is insecure as it always "
337 : "creates or uses insecure temporary file",
338 1: CE->getLocStart(), &R, 1);
339 : }
340 :
341 :
342 : //===----------------------------------------------------------------------===//
343 : // Check: Linear congruent random number generators should not be used
344 : // Originally: <rdar://problem/63371000>
345 : // CWE-338: Use of cryptographically weak prng
346 : //===----------------------------------------------------------------------===//
347 :
348 23: void WalkAST::CheckCall_rand(const CallExpr *CE, const FunctionDecl *FD) {
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349 23: if (II_rand[0] == NULL) {
350 : // This check applies to these functions
351 : static const char * const identifiers[num_rands] = {
352 : "drand48", "erand48", "jrand48", "lrand48", "mrand48", "nrand48",
353 : "lcong48",
354 : "rand", "rand_r"
355 : };
356 :
45: branch 0 taken
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357 50: for (size_t i = 0; i < num_rands; i++)
358 45: II_rand[i] = &BR.getContext().Idents.get(identifiers[i]);
359 : }
360 :
361 23: const IdentifierInfo *id = FD->getIdentifier();
362 : size_t identifierid;
363 :
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364 185: for (identifierid = 0; identifierid < num_rands; identifierid++)
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162: branch 1 taken
365 171: if (id == II_rand[identifierid])
366 9: break;
367 :
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9: branch 1 taken
368 23: if (identifierid >= num_rands)
369 14: return;
370 :
371 9: const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
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9: branch 1 taken
372 9: if (!FTP)
373 0: return;
374 :
5: branch 1 taken
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375 9: if (FTP->getNumArgs() == 1) {
376 : // Is the argument an 'unsigned short *'?
377 : // (Actually any integer type is allowed.)
378 5: const PointerType *PT = dyn_cast<PointerType>(FTP->getArgType(0));
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5: branch 1 taken
379 5: if (!PT)
380 0: return;
381 :
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382 5: if (! PT->getPointeeType()->isIntegerType())
383 0: return;
384 : }
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385 4: else if (FTP->getNumArgs() != 0)
386 0: return;
387 :
388 : // Issue a warning.
389 9: std::string buf1;
390 9: llvm::raw_string_ostream os1(buf1);
391 9: os1 << "'" << FD->getNameAsString() << "' is a poor random number generator";
392 :
393 9: std::string buf2;
394 9: llvm::raw_string_ostream os2(buf2);
395 : os2 << "Function '" << FD->getNameAsString()
396 : << "' is obsolete because it implements a poor random number generator."
397 9: << " Use 'arc4random' instead";
398 :
399 9: SourceRange R = CE->getCallee()->getSourceRange();
400 :
401 : BR.EmitBasicReport(os1.str(), "Security", os2.str(),
402 9: CE->getLocStart(), &R, 1);
403 : }
404 :
405 : //===----------------------------------------------------------------------===//
406 : // Check: 'random' should not be used
407 : // Originally: <rdar://problem/63371000>
408 : //===----------------------------------------------------------------------===//
409 :
410 23: void WalkAST::CheckCall_random(const CallExpr *CE, const FunctionDecl *FD) {
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411 23: if (FD->getIdentifier() != GetIdentifier(II_random, "random"))
412 22: return;
413 :
414 1: const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
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1: branch 1 taken
415 1: if (!FTP)
416 0: return;
417 :
418 : // Verify that the function takes no argument.
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419 1: if (FTP->getNumArgs() != 0)
420 0: return;
421 :
422 : // Issue a warning.
423 1: SourceRange R = CE->getCallee()->getSourceRange();
424 : BR.EmitBasicReport("'random' is not a secure random number generator",
425 : "Security",
426 : "The 'random' function produces a sequence of values that "
427 : "an adversary may be able to predict. Use 'arc4random' "
428 : "instead",
429 1: CE->getLocStart(), &R, 1);
430 : }
431 :
432 : //===----------------------------------------------------------------------===//
433 : // Check: Should check whether privileges are dropped successfully.
434 : // Originally: <rdar://problem/6337132>
435 : //===----------------------------------------------------------------------===//
436 :
437 27: void WalkAST::CheckUncheckedReturnValue(CallExpr *CE) {
438 27: const FunctionDecl *FD = CE->getDirectCallee();
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27: branch 1 taken
439 27: if (!FD)
440 0: return;
441 :
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442 27: if (II_setid[0] == NULL) {
443 : static const char * const identifiers[num_setids] = {
444 : "setuid", "setgid", "seteuid", "setegid",
445 : "setreuid", "setregid"
446 : };
447 :
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448 35: for (size_t i = 0; i < num_setids; i++)
449 30: II_setid[i] = &BR.getContext().Idents.get(identifiers[i]);
450 : }
451 :
452 27: const IdentifierInfo *id = FD->getIdentifier();
453 : size_t identifierid;
454 :
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455 174: for (identifierid = 0; identifierid < num_setids; identifierid++)
4: branch 0 taken
147: branch 1 taken
456 151: if (id == II_setid[identifierid])
457 4: break;
458 :
23: branch 0 taken
4: branch 1 taken
459 27: if (identifierid >= num_setids)
460 23: return;
461 :
462 4: const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FD->getType());
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4: branch 1 taken
463 4: if (!FTP)
464 0: return;
465 :
466 : // Verify that the function takes one or two arguments (depending on
467 : // the function).
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468 4: if (FTP->getNumArgs() != (identifierid < 4 ? 1 : 2))
469 0: return;
470 :
471 : // The arguments must be integers.
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472 10: for (unsigned i = 0; i < FTP->getNumArgs(); i++)
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473 6: if (! FTP->getArgType(i)->isIntegerType())
474 0: return;
475 :
476 : // Issue a warning.
477 4: std::string buf1;
478 4: llvm::raw_string_ostream os1(buf1);
479 : os1 << "Return value is not checked in call to '" << FD->getNameAsString()
480 4: << "'";
481 :
482 4: std::string buf2;
483 4: llvm::raw_string_ostream os2(buf2);
484 : os2 << "The return value from the call to '" << FD->getNameAsString()
485 : << "' is not checked. If an error occurs in '"
486 : << FD->getNameAsString()
487 4: << "', the following code may execute with unexpected privileges";
488 :
489 4: SourceRange R = CE->getCallee()->getSourceRange();
490 :
491 : BR.EmitBasicReport(os1.str(), "Security", os2.str(),
492 4: CE->getLocStart(), &R, 1);
493 : }
494 :
495 : //===----------------------------------------------------------------------===//
496 : // Entry point for check.
497 : //===----------------------------------------------------------------------===//
498 :
499 7: void clang::CheckSecuritySyntaxOnly(const Decl *D, BugReporter &BR) {
500 7: WalkAST walker(BR);
501 7: walker.Visit(D->getBody());
502 7: }
Generated: 2010-02-10 01:31 by zcov