diff options
Diffstat (limited to 'security/nss/lib/smime/cmsmessage.c')
| -rw-r--r-- | security/nss/lib/smime/cmsmessage.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/security/nss/lib/smime/cmsmessage.c b/security/nss/lib/smime/cmsmessage.c new file mode 100644 index 000000000..27d1256ec --- /dev/null +++ b/security/nss/lib/smime/cmsmessage.c @@ -0,0 +1,293 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * CMS message methods. + */ + +#include "cmslocal.h" + +#include "cert.h" +#include "secasn1.h" +#include "secitem.h" +#include "secoid.h" +#include "pk11func.h" +#include "secerr.h" + +/* + * NSS_CMSMessage_Create - create a CMS message object + * + * "poolp" - arena to allocate memory from, or NULL if new arena should be created + */ +NSSCMSMessage * +NSS_CMSMessage_Create(PLArenaPool *poolp) +{ + void *mark = NULL; + NSSCMSMessage *cmsg; + PRBool poolp_is_ours = PR_FALSE; + + if (poolp == NULL) { + poolp = PORT_NewArena(1024); /* XXX what is right value? */ + if (poolp == NULL) + return NULL; + poolp_is_ours = PR_TRUE; + } + + if (!poolp_is_ours) + mark = PORT_ArenaMark(poolp); + + cmsg = (NSSCMSMessage *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSMessage)); + if (cmsg == NULL || + NSS_CMSContentInfo_Private_Init(&(cmsg->contentInfo)) != SECSuccess) { + if (!poolp_is_ours) { + if (mark) { + PORT_ArenaRelease(poolp, mark); + } + } else + PORT_FreeArena(poolp, PR_FALSE); + return NULL; + } + + cmsg->poolp = poolp; + cmsg->poolp_is_ours = poolp_is_ours; + cmsg->refCount = 1; + + if (mark) + PORT_ArenaUnmark(poolp, mark); + + return cmsg; +} + +/* + * NSS_CMSMessage_SetEncodingParams - set up a CMS message object for encoding or decoding + * + * "cmsg" - message object + * "pwfn", pwfn_arg" - callback function for getting token password + * "decrypt_key_cb", "decrypt_key_cb_arg" - callback function for getting bulk key for encryptedData + * "detached_digestalgs", "detached_digests" - digests from detached content + */ +void +NSS_CMSMessage_SetEncodingParams(NSSCMSMessage *cmsg, + PK11PasswordFunc pwfn, void *pwfn_arg, + NSSCMSGetDecryptKeyCallback decrypt_key_cb, void *decrypt_key_cb_arg, + SECAlgorithmID **detached_digestalgs, SECItem **detached_digests) +{ + if (pwfn) + PK11_SetPasswordFunc(pwfn); + cmsg->pwfn_arg = pwfn_arg; + cmsg->decrypt_key_cb = decrypt_key_cb; + cmsg->decrypt_key_cb_arg = decrypt_key_cb_arg; + cmsg->detached_digestalgs = detached_digestalgs; + cmsg->detached_digests = detached_digests; +} + +/* + * NSS_CMSMessage_Destroy - destroy a CMS message and all of its sub-pieces. + */ +void +NSS_CMSMessage_Destroy(NSSCMSMessage *cmsg) +{ + PORT_Assert(cmsg->refCount > 0); + if (cmsg->refCount <= 0) /* oops */ + return; + + cmsg->refCount--; /* thread safety? */ + if (cmsg->refCount > 0) + return; + + NSS_CMSContentInfo_Destroy(&(cmsg->contentInfo)); + + /* if poolp is not NULL, cmsg is the owner of its arena */ + if (cmsg->poolp_is_ours) + PORT_FreeArena(cmsg->poolp, PR_FALSE); /* XXX clear it? */ +} + +/* + * NSS_CMSMessage_Copy - return a copy of the given message. + * + * The copy may be virtual or may be real -- either way, the result needs + * to be passed to NSS_CMSMessage_Destroy later (as does the original). + */ +NSSCMSMessage * +NSS_CMSMessage_Copy(NSSCMSMessage *cmsg) +{ + if (cmsg == NULL) + return NULL; + + PORT_Assert(cmsg->refCount > 0); + + cmsg->refCount++; /* XXX chrisk thread safety? */ + return cmsg; +} + +/* + * NSS_CMSMessage_GetArena - return a pointer to the message's arena pool + */ +PLArenaPool * +NSS_CMSMessage_GetArena(NSSCMSMessage *cmsg) +{ + return cmsg->poolp; +} + +/* + * NSS_CMSMessage_GetContentInfo - return a pointer to the top level contentInfo + */ +NSSCMSContentInfo * +NSS_CMSMessage_GetContentInfo(NSSCMSMessage *cmsg) +{ + return &(cmsg->contentInfo); +} + +/* + * Return a pointer to the actual content. + * In the case of those types which are encrypted, this returns the *plain* content. + * In case of nested contentInfos, this descends and retrieves the innermost content. + */ +SECItem * +NSS_CMSMessage_GetContent(NSSCMSMessage *cmsg) +{ + /* this is a shortcut */ + NSSCMSContentInfo *cinfo = NSS_CMSMessage_GetContentInfo(cmsg); + SECItem *pItem = NSS_CMSContentInfo_GetInnerContent(cinfo); + return pItem; +} + +/* + * NSS_CMSMessage_ContentLevelCount - count number of levels of CMS content objects in this message + * + * CMS data content objects do not count. + */ +int +NSS_CMSMessage_ContentLevelCount(NSSCMSMessage *cmsg) +{ + int count = 0; + NSSCMSContentInfo *cinfo; + + /* walk down the chain of contentinfos */ + for (cinfo = &(cmsg->contentInfo); cinfo != NULL;) { + count++; + cinfo = NSS_CMSContentInfo_GetChildContentInfo(cinfo); + } + return count; +} + +/* + * NSS_CMSMessage_ContentLevel - find content level #n + * + * CMS data content objects do not count. + */ +NSSCMSContentInfo * +NSS_CMSMessage_ContentLevel(NSSCMSMessage *cmsg, int n) +{ + int count = 0; + NSSCMSContentInfo *cinfo; + + /* walk down the chain of contentinfos */ + for (cinfo = &(cmsg->contentInfo); cinfo != NULL && count < n; + cinfo = NSS_CMSContentInfo_GetChildContentInfo(cinfo)) { + count++; + } + + return cinfo; +} + +/* + * NSS_CMSMessage_ContainsCertsOrCrls - see if message contains certs along the way + */ +PRBool +NSS_CMSMessage_ContainsCertsOrCrls(NSSCMSMessage *cmsg) +{ + NSSCMSContentInfo *cinfo; + + /* descend into CMS message */ + for (cinfo = &(cmsg->contentInfo); cinfo != NULL; + cinfo = NSS_CMSContentInfo_GetChildContentInfo(cinfo)) { + if (!NSS_CMSType_IsData(NSS_CMSContentInfo_GetContentTypeTag(cinfo))) + continue; /* next level */ + + if (NSS_CMSSignedData_ContainsCertsOrCrls(cinfo->content.signedData)) + return PR_TRUE; + /* callback here for generic wrappers? */ + } + return PR_FALSE; +} + +/* + * NSS_CMSMessage_IsEncrypted - see if message contains a encrypted submessage + */ +PRBool +NSS_CMSMessage_IsEncrypted(NSSCMSMessage *cmsg) +{ + NSSCMSContentInfo *cinfo; + + /* walk down the chain of contentinfos */ + for (cinfo = &(cmsg->contentInfo); cinfo != NULL; + cinfo = NSS_CMSContentInfo_GetChildContentInfo(cinfo)) { + switch (NSS_CMSContentInfo_GetContentTypeTag(cinfo)) { + case SEC_OID_PKCS7_ENVELOPED_DATA: + case SEC_OID_PKCS7_ENCRYPTED_DATA: + return PR_TRUE; + default: + /* callback here for generic wrappers? */ + break; + } + } + return PR_FALSE; +} + +/* + * NSS_CMSMessage_IsSigned - see if message contains a signed submessage + * + * If the CMS message has a SignedData with a signature (not just a SignedData) + * return true; false otherwise. This can/should be called before calling + * VerifySignature, which will always indicate failure if no signature is + * present, but that does not mean there even was a signature! + * Note that the content itself can be empty (detached content was sent + * another way); it is the presence of the signature that matters. + */ +PRBool +NSS_CMSMessage_IsSigned(NSSCMSMessage *cmsg) +{ + NSSCMSContentInfo *cinfo; + + /* walk down the chain of contentinfos */ + for (cinfo = &(cmsg->contentInfo); cinfo != NULL; + cinfo = NSS_CMSContentInfo_GetChildContentInfo(cinfo)) { + switch (NSS_CMSContentInfo_GetContentTypeTag(cinfo)) { + case SEC_OID_PKCS7_SIGNED_DATA: + if (!NSS_CMSArray_IsEmpty((void **)cinfo->content.signedData->signerInfos)) + return PR_TRUE; + break; + default: + /* callback here for generic wrappers? */ + break; + } + } + return PR_FALSE; +} + +/* + * NSS_CMSMessage_IsContentEmpty - see if content is empty + * + * returns PR_TRUE is innermost content length is < minLen + * XXX need the encrypted content length (why?) + */ +PRBool +NSS_CMSMessage_IsContentEmpty(NSSCMSMessage *cmsg, unsigned int minLen) +{ + SECItem *item = NULL; + + if (cmsg == NULL) + return PR_TRUE; + + item = NSS_CMSContentInfo_GetContent(NSS_CMSMessage_GetContentInfo(cmsg)); + + if (!item) { + return PR_TRUE; + } else if (item->len <= minLen) { + return PR_TRUE; + } + + return PR_FALSE; +} |